Saturday, October 4

About Meteorology

Meteorology is the science of the atmosphere. It takes its name from the Greek word meteoron-something that happens high in the sky. The ancient Greeks observed clouds, winds, and rain and tried to understand how they are connected to one another. The weather was important in their relatively simple society because it affected the farmers who raised their food and their seamen who sailed the oceans. Today, our complex society and our environment are affected even more seriously by events and changes in the atmosphere. We must address many complicated issues and answer many difficult questions about the behavior of the atmosphere and its effects on the people of our planet.
An Ancient Science
Aristotle is considered the father of meteorology. His book Meteorologica, written around 340 B.C., was the first major study of the atmosphere. Although some of Aristotle's ideas about rain, hailstorms, and other kinds of weather were accurate, many were not. Like other thinkers of his time, he believed that logic and reason alone could lead to truth. He did not think it was necessary to observe the details of the natural world in order to understand it.
Many centuries later, natural philosophers, as scientists were called in the early years of modern science, realized that speculation and logical arguments alone could not produce real understandings of nature. To understand things that happened in the world around them, it was necessary to measure, record, and analyze them. But for a very long time, the only features of the weather that could be measured were wind direction and rainfall. The thermometer was invented around A.D. 1600, and the barometer, which measures atmospheric pressure, came a few years later. Over the next 200 years, devices were developed for measuring wind speed, humidity, and other important qualities of the atmosphere. Scientists used these instruments to record the long-term trends that are known as climate. However, they still did not understand the day-to-day behavior of thunderstorms, hurricanes, tornadoes, and other weather phenomena.
Meteorology Matures
By the mid-1800s, meteorologists began to realize that clouds, winds, and rain at a particular place are produced by large weather systems that grow and change as they move across the face of the earth. However, this knowledge was not very useful as long as weather information could travel no faster than the weather itself. Then the telegraph was invented, allowing weather reports to be sent out almost instantly. Future weather over much of the United States and Europe was predicted by watching storms develop and assuming that they would move eastward. In the early 1900s, a group of Norwegian meteorologists began to study weather systems by applying basic laws of physics to the behavior of the atmosphere. Their approach, based on the movements of huge cold and warm air masses and the "fronts" where they meet, is the foundation of modern weather forecasting.
In the early 1940s, World War II brought great advances in meteorology. Large-scale military land, sea, and air campaigns were highly dependent on weather over vast regions from the North Atlantic to the South Pacific. University meteorology departments grew rapidly as the military services sent cadets to be trained as weather officers. The military also supported scientific research on weather and climate. Wartime technological developments such as radar proved to be valuable meteorological observing systems.
Meteorologists have developed many more new tools and techniques for observing and studying the atmosphere since World War II. They probe the violent cores of thunderstorms with radar and high-performance aircraft, and they use satellites to observe hurricanes and other major weather systems. They develop numerical models-sets of equations that represent atmospheric processes-and run them on supercomputers to analyze and predict the behavior of the atmosphere on every scale from the formation of raindrops to the circulation of the atmosphere over the entire earth.
More than 2,000 years ago, Greek philosophers looked at the sky and tried to understand what was happening there. Today, the ancient science of meteorology has matured. It is at the cutting edge of research, seeking answers to basic questions about the world around us and working to develop applications that are critically important to our lives and the lives of our children and grandchildren.
When we hear the word "meteorologist," we often think of the person on the television screen who tells us about tomorrow's high and low temperatures and precipitation. Many radio and television weathercasters are professional meteorologists, but others are reporters who are passing on information provided by the Department of Hydrology and Meteorology. A meteorologist can be defined as a person with specialized education "who uses scientific principles to explain, understand, observe, or forecast the earth's atmospheric phenomena and/or how the atmosphere affects the earth and life on the planet." This education usually includes a bachelor's or higher degree from a college or university. Many meteorologists have degrees in physics, chemistry, mathematics, and other fields. The broader term "atmospheric science" often is used to describe the combination of meteorology and other branches of physical science that are involved in studying the atmosphere.
Meteorologists do many things, some of which may surprise you. They work in atmospheric research, teaching, weather forecasting, and other kinds of applied meteorology.
Atmospheric Research
Many research meteorologists are seeking answers to the questions that are scattered through this booklet. Here are some examples:
· Atmospheric scientists are working to assess the threat of global warming by collecting and analyzing past and present data on worldwide temperature trends. They use the biggest and fastest supercomputers that are available to simulate past changes in climate as well as basic atmospheric processes that are occurring today. They are trying to clear up many uncertainties about how changes in water vapor, clouds, and snow might feed back into the greenhouse effect and alter the warming trend. They also are studying interactions among the atmosphere and the oceans, the polar ice caps, and the earth's plants and animals. These studies are part of a growing field that is known as global change research or earth systems science.
· Several atmospheric research groups have studied microbursts with radar, instrumented aircraft, and other research tools.
· Meteorologists are collaborating with atmospheric chemists and computer modelers to study the sources, transport, and chemical changes in pollutants that are causing serious regional air quality problems in different regions.
Research meteorologists often work closely with scientists in basic physical disciplines such as chemistry, physics, and mathematics as well as with oceanographers, hydrologists, and researchers in other branches of environmental science. Mathematicians and computer scientists help meteorologists design computer models of atmospheric processes. Meteorologists and oceanographers work together to study many important ocean-atmosphere interactions. Research meteorologists work with biologists to try to understand how plants and animals interact with the atmosphere and with political scientists and economists to study the potential effects of global warming on our society and the world.
Weather Forecasting
Forecasting has always been at the heart of meteorology, and many young people have been drawn to the profession by the challenge of forecasting a natural event and seeing that forecast affect the lives of thousands of people. Meteorologists who have worked in the field of forecasting for the last 30 years or so have seen exciting advances in their ability to predict the weather. Weather forecasting involves many people in many countries because the systems that bring us our weather are hundreds of miles in extent and move across huge regions of the earth's surface as they grow and change. National Weather Service forecasts help the general public and large special-interest groups such as the aviation and agriculture industries. Private forecasting organizations also serve these groups as well as clients with very specific needs for highly specialized forecasts. They take on tasks such as short-term, small-scale snow forecasts for city public works managers who need to know how many snowplows to put on the streets in various neighborhoods when a winter storm is on the way. Private forecasters work for commodities traders who are concerned about the effects of weather on crop production and prices. They forecast the weather for athletic events such as professional football games and golf tournaments. They keep gas and electric companies informed about impending hot spells or cold waves that will put heavy demands on generating plants and transmission systems. They provide local weather forecasts to many radio and television stations that do not employ their own meteorologists.
Other Applications
Meteorologists could provide a variety of services to industries and other organizations. Some are consulting meteorologists with their own companies and others worked for corporations. Meteorologists help planners and contractors locate and design airports, factories and many other kinds of construction projects. They provide climatological information for heating and air conditioning engineers. They testify as expert witnesses in court cases that involve the weather. Over the past 10 years or so, the fastest growing specialty of meteorology has been computer processing of weather information. Private companies have developed computerized information systems to provide specialized weather data and displays. They could produce many of the colorful graphics that you see on television screens and newspaper pages.
Teaching
Atmospheric science education at the college and university level has grown tremendously in recent years in developing countries. In addition to classroom teaching, many university atmospheric scientists direct research that graduate students are performing to earn their degrees. Many institutions offer a major in meteorology or atmospheric science, while others provide atmospheric science courses to supplement related science and engineering fields or as part of a broader educational curricula. Some colleges and universities offer courses in global change and earth systems science. In high schools and lower grades, atmospheric science usually is taught as part of other natural science courses. Training in meteorology is good preparation for a career as a science teacher at any level.
Retrieved from American Meteorological Society's Website but edited some

Thursday, September 4

Nepal’s Approach and Swedish policies to combat Climate Change



Nepal (South Asia)                                                            Sweden (Northern Europe)
Latitude: 26°22’ to 30°27’N                                                                 62° 00' North
Longitude: 80°04’ to 88°12’E                                                                 15° 00' East
Population: 23.2 million                                                                              8.9 million
Total Area: 56,812 sq.miles                                                             173,730 sq miles

Background

Humanity and the eco-system are in increasing threat to climate change due to anthropogenic emissions of Greenhouse Gases (GHGs) to the atmosphere was recognized by the global community with the adoption of United Nations Framework Convention on Climate Change(UNFCCC) in June 1992. As far as possible, though a Non-Annex I Party to UNFCCC, Nepal has realized the obligation to the convection and is making effort towards reducing emissions of GHGs likes to participate and cooperate in all possibilities within the Framework Convention in international and regional activities dealing this Climate Change issue.

Nepal has reasons to be concerned about climate change. Being a developing country it is more vulnerable to the effects of climate change due to its high dependence on climate-sensitive sectors like glaciers, agriculture and forestry, and its low financial adaptive capacity Human induced climate change is already taking place, showing its effects and certain to proceed in future decades. Annual GHG emission of Nepal is about 0.025% with less than 0.4% of the world population which is negligibly small. Nepal’s vulnerability to damage from climate change due to increasing temperatures are more in high mountain areas as glaciers and snow fields will recede and may even disappear, reducing Nepal’s dry season river water source. This will impact irrigation and drinking water supply as well as reliability of hydroelectricity. Furthermore, retreating glaciers often leave behind growing glacier lakes that can break through terminal moraines causing catastrophic floods. There is likely shift in monsoon precipitation patterns that will threaten current agricultural practices, in addition to threaten infrastructure. Biodiversity, especially in mountain areas, are vulnerable to changing temperature and moisture patterns due to restriction in migration of species.

Nepal’s Strategies for Environment problems

Nepal has prepared its Inventory of Greenhouse Gases on the twelve month period beginning July 1994 and ending June 1995 in line with the Revised IPCC guidelines of 1996 were followed as the methodological basis for estimating GHG emissions and sinks while making the First Initial National Communication to the Conference of the Parties of the United Nations Framework Convention on Climate Change. Nepal has enforced a variety of strategies and have to imply different policies owing the long term climatic change affects.9th and 10th Plan has emphasized several alternative energy sources to reduce the domestic use of wood and fossil fuels with more use of hydropower and bio-gas. Besides, policies has been implemented to import Euro-1 standard vehicles and banned in registration of two stroke vehicles to increase the efficiency of the transport sector and reduce pollution from this sector. Now there is specification of Ambient air quality standard and different monitoring stations (PM10, TSP, NO2, SO2, Benzene) functioning 24hrs daily. As forests are important carbon sink and important natural eco-system, Local Community Forests (Forest Act 1993) have to manage under sustainable forest management principle. Besides these, National Parks, non-Hunting Areas and Wildlife Sanctuaries comprising 18% of total land areas has declared as conservation forests and various measures have been employed to protect the conservation forests. Since the sources of water have to be protected; the plan should also pay attention to the protection of the upper watershed in the country as Climate Change mitigation. A policy should link construction of tube well in Kathmandu and Terai region to monitor indiscrimination of ground water. Particular attentions should be placed on breeding strong drought/paste/diseases resistant varieties and the development of measures for soil and water conservation. It is also essential that adequate fund needs to be provided for conducting research to address the Climate Change in agriculture.

Swedish Polices and Efforts

According to Swedish national policies and its efforts to contribute to an international future climate regime post 2012, Climate Change is the major environmental and political challenges which reflected both in. Sweden has to set an example by decreasing GHGs by four percent lower than in 1990 from combine proactive climate policies and economic growth. Sweden has one of the lowest emissions levels per capita among industrialized countries and already lowered GHGs by seven percent in 2005 than in 1990 with economic growth of 36%.

In 1991, Sweden introduced carbon dioxide tax to limit climate impact in a socially and economically efficient manner. Swedish climate policy is based on the use of economic instruments. Hydro and nuclear power, largely carbon neutral, are means for production of electricity and has a system of green electricity certificates to stimulate the production of electricity from renewable sources, such as wind power, hydro power and combined heat and power production (CHP) based on biofuels. To reduce emissions from transportation investments are made to research and development of green cars and has introduced a rebate is granted to purchase a new green car. Sweden has a system of green electricity certificates to stimulate the production of electricity from renewable sources, such as wind power, hydro power and combined heat and power production (CHP) based on biofuels.

Without having broader and deeper cooperation with business and industry, the research community as well as the political sphere it is impossible to mitigate the impact of climate change so different initiatives like setting up of a Commission on Sustainable Development, a Scientific Council on Climate Issues and a Climate Committee to review climate policy has been established by Sweden to increase involvement of the entire society. In 2008, Government of Sweden has planned to produce climate policy bill to the parliament as one scheme.

Sweden works to achieve national climate policy for the national target for the period 2008-2012 and to shed light on what additional action may be required. With a population of some 9 million, Swedish contribution to annual global emissions of greenhouse gases is nearly negligible. Therefore, Sweden believes that international co-operation is of decisive importance in the effort to combat climate change.

In an informal meeting in Riksgransen on June 11-14, 2007, the Swedish Government along with some 27 environment ministers has discussed on climate change and a new climate regime where Sweden suggested measures to all countries particularly for poor and vulnerable developing countries;
· More ambitious and legally-binding emission reduction targets for all developed countries;
· Enhanced mitigation actions by developing countries;
· Further action on the deforestation issue;
· Managing unintended consequences of adaptation and mitigation policies;
· Technology development, diffusion and commercialization, in order to support mitigation, adaptation, and more generally, decarbonisation of our economies.
· Investment, incentives, financing, capacity-building, awareness and education.


Conclusion

Everyday human induced and natural GHGs are increasing in the atmosphere. The industrial countries emits enormous amount of GHGs from their industries every hour and blame the developing nations for deforestation and burning of firewood. The global temperature would rise between 1.5° to 4.5° Celsius by sometime in 21st Century (IPCC 2001) and UN has declared that the world has only eight years left to save climate(Climate Today, May 8,2007).

Both Nepal and Sweden produce negligible rate of GHGs but divergence in most of the aspects like climate, geography, development etc. Sweden is serious in making and following policies both in the short and long term. Sweden’s policies are significant in Nepalese context as well though strategies and policies exist already. Nepal desires to acquire support equally from social and political sector to build capacity to respond to the problem. The political sustainability highly alters the policies to combat climate change else the Greenhouse Gas Emissions Inventory and Mitigation Options remain unconvinced, though doubts and argues continue in the timing and precise extent. Nepalese Government has to set out obligatory contribution to international efforts like Swedish policies to address Climate Change issues. Until Nepal lacks the capacity to address Climate Change problems, discussion on sustainable environment management remain insignificant.

References:
1. GoN/ National Planning Commission, Three Years Interim Plan (2064/65-2066/67), Ashar 2064, Nepal.
2. HMGN/NPC/MOPE 2003, Sustainable Development Agenda for Nepal, 32 Pages
3. Ministry of Agriculture and Cooperatives, June 2007, Government of Nepal, “Melting Ice: A Hot Topic?”, The Journal of Agriculture and Environment,Vol:8.
4. MOPE/UNEP, June 2004, First Initial National Communication to the Conference of the Parties of the United Nations Framework Convention on Climate Change, Nepal.
5. Shukla, P.R., Sharma, Subodh K, Ramana P Venkata,2002,Climate Change and India, Issues, Concerns and Opportunities, Tata McGraw-Hill publishing company limited, New Delhi .
6. Sweden, Ministry of the Environment, Swedish policies to combat climate change, Memorandum, July 2007.

Carbon Sequestration of Forest


The climate is changing globally due to huge concentration of Greenhouse Gases, carbon dioxide (CO2) in particular, that traps outgoing long wave infra-red radiations into the atmosphere. Such gases contribute to higher global temperatures that could increase the frequency of extreme weather events and have a reflective impact on human health, glaciers, sea levels, natural habitats, and agriculture. Taking such cases in account, Kyoto Protocol was prepared in December 1997that recognizes human-induced carbon sequestration as a way of meeting legally binding greenhouse gas emissions targets. This protocol specifically point out emissions from different sources and related removals by sinks resulting from direct, human-made land-use change and forest-related activities (deforestation, reforestation, and afforestation) undertaken since 1990. Forest sinks are particularly attractive, since no new technologies need to be developed and forests also generate other social benefits.


Forests plays a critical role in climate change by sequestering, or storing, large quantities of carbon (by absorbing CO2) as they grow and releasing it when they die. Photosynthesis and respiration are the crucial mechanism by which forests accumulate and release carbon. A growing tree absorbs CO2 from the air during the process of photosynthesis, uses solar energy to store carbon in its roots, stems, branches, and foliage. When trees decay and die, they become a carbon source, releasing more carbon than they can absorb. And when forests are harvested, burned, or cleared by humans, or in the event of a natural disturbance such as fire or disease, some of the carbon stored in the trees’ cells is released into the atmosphere. Stored carbon, however, can be transferred into forest products—for example, wood used for lumber, furniture, and other durable goods can seize its carbon for decades or even centuries in case of well maintained.


One that occupies carbon is called a “sink” and that releases carbon is called a “source.” Shifts of carbon over time from one stock to another—from the atmosphere to the forest, for example—are referred as carbon “fluxes.” Over time, carbon may be transferred from one stock to another. For example, burning of fossil fuel moves carbon from fossil fuel deposits to the atmosphere. Physical processes also gradually convert some atmospheric carbon into the ocean stock. Biological growth in plants fixes atmospheric carbon in cell tissues, thereby transforming carbon from the atmosphere to the biotic system.

The total carbon supply of an old-growth forest may be large as they experiencing little net growth that means changes in that storage are small or negligible. In case young, fast-growing forests the stock may be small while the fluxes may be significant. There is potential for agricultural crops and grasses to act as a sink and sequester carbon but it appears to be limited due to their short life and limited biomass accumulations. Even so, agricultural and grassland soils have sufficient potential to sequester carbon.


The well known approach of carbon sequestration is probably the role of forests besides oceans, and carbon storage arrangement in forests is large enough that forests offer the high probability of sequestering considerable amounts of extra carbon in relatively short periods, such as decades. However, during burning of forest carbon release fairly quickly.

In a forest ecosystem there are five storages of carbon. These are as follows;

· Above-ground biomass(canopy),
· Below-ground biomass,
· Litter,
· Dead wood, and
· Soils organic carbon

In forests, carbon is sequestered in the process of plant growth as carbon is captured in plant cell formation and oxygen is released. As the forest biomass experiences growth, the carbon held captive in the forest stock increases. Concurrently, plants grow on the forest floor and add to this carbon store. In due course, branches, leaves, and other materials fall to the forest floor and may store carbon until they decompose. Moreover, forest soils may sequester some part of the decomposing plant litter in the course of root/soil interactions. In addition, carbon may be sequestered for extensive periods in long-lived wood products resulting from forest harvests.

The change of forest from one ecological form to another will generate large carbon surges, forests can be a carbon source or a sink. It is important to evaluate carefully exactly what is happening to the carbon as the forest changes to establish the forest’s sink/source contribution. Seeing that the forest as a source net carbon released is due to biomass reductions from fire, tree decomposition, or logging. In the case of decomposition or fire, forest carbon is released into the atmosphere. However, the forest may again become a carbon sink as it is restored through forest re-growth.

Widely on earth, wood is consumed as a source of energy and burning wood releases carbon into the atmosphere. Where the fuel wood is taken from a forest and re-growth occurs, no net carbon is emitted. Furthermore, to the extent that biofuels are produced sustainably and used as a substitute for fossil fuel energy, fossil fuel emissions are avoided and no new net carbon emissions are created, since biofuels re-growth offsets the initial biofuels emissions,

The terms Deforestation, Reforestation and Afforestation are often used in case of forest management so to the carbon sequestration management scheme. It is in the state of deforestation when forest land is cleared and reforestation does not take place. Usually, land clearing is connected with the everlasting conversion of forest lands to other uses, for instance croplands, ground or urban land. Once forest is changed to some other purposes, there is a net loss of carbon in the normal storage since most other land uses will sequester less carbon than the forest. Under such situations, net carbon transfers occur. If the place is cleared and the vegetation burned, most of the carbon is freed into the atmosphere. However, to the extent that the vegetation is converted into long-lived wood products or substituted for fossil fuel energy, only a part of the carbon in the forest will be a net release into the atmosphere.

Even if reforestation typically refers to the practice of reestablishing a forest on a site that has been recently harvested, it also may refer to the reestablishment of forest on a site that has been cleared for some period of time. In either case, reforestation acts as a carbon sink since it results in the build-up of carbon stocks in the recently established biomass.

The formation of a forest on land never forested or not forested for a very long time is called afforestation. Often the distinction between afforestation and reforestation shapes as the period during which the forest has been missing from the land extend. Afforestation arises when forests are established on grasslands never previously forested. Rehabilitation of different lands into forest will consume additional amount of carbon in trees and other components of the forest ecosystem.

In tropical regions, it is common that natural or human-induced conversion of land into reforestation of commercial timber harvests. When such harvests are accompanied by reforestation, the land-clearing effects of the harvest on the forest carbon stocks are offset, in the long term, by carbon sequestration and the build-up of carbon stocks in the newly regenerated forest. The long-standing alternation in carbon storage will depend directly on the type and scale of forest harvested and regenerated. In some cases, second-growth forest will not sequester as much carbon as the original forest. For instance, when old-growth forest is harvested, the replacement forest typically will involve less volume, especially if it is being managed for timber harvests. However, when storage in long-lived wood products is considered, the net carbon of the managed replacement forest and its products will more closely approach, and perhaps exceed, that of the initial forest over a longer period.

Forest management can contribute to carbon sequestration by promoting forest growth and biomass accumulation. Additionally, management can choose to widen the harvest rotation, thereby increasing the average forest stock and hence the average carbon sequestered in a forest

Finally, natural disasters can affect forest stocks and often result in forests becoming a carbon source—at least for a time. Large fraction of the world’s forests is subject to natural instability that occurs occasionally as part of natural cycles. Forest are subject to substantial carbon-releasing disturbances, particularly in the form of wildfires, that often occur after the forest is first disturbed by other forces, such as drought, disease, or pests. Natural disasters may discharge large amounts of carbon in a short period of time. On the other hand, where land is not changed to other uses, the forest classically re-establishes itself and again begins to hold carbon. In many forests, natural disturbance systems create a cyclic model of growth (sequestration), disturbance (emission), and re-growth (sequestration) over a period of years.

In case of Nepal, forests are the most important natural resources after water. Majority of people use forest products as firewood, food, fodder, timber and medicines. Wide-ranging utilization of and growing demands for forest products have led to its declining both in area and quality. Further, Global Warming may cause forest damage through migration towards the polar region, changes in their composition, extinction of species etc. The outcome of this situation could affect directly not only the environment of Nepal but also lives of majority of the people

According to Holdridge model there are 39 vegetation zones out of which Nepal has 15 types under the existing (CO2) condition. There would be only 12 types under 2xCO2 climatic condition as depicted by the model. In the same way tropical wet forest and warm temperate rain forest would vanish, and cool temperate vegetation would turn into warm temperate vegetation under double CO2 condition. As per the IPCC Guidelines, though Nepal lies among the tropical countries with six forest categories namely wet lands, moist with short dry season, moist with long dry season, dry, montane moist, and montane dry, the study has found only three of them as relevant to Nepal

The Department of Forest Research and Survey (DFRS, 1999) has estimated at 4,268.8 thousand hectares of forest area in 1994/95, which is about 29 % of the entire territory of the country. The forest cover in 1978/79 was about 5,616.8 thousand hectares, covering around 38 % of total territory of Nepal (LRMP, Land Utilization Report, 1986). The dissimilarity has been cited for deforestation or reduction rate of forests, which amounts to 1.7 % between the periods of 1978/79 and 1994/95. In total 1,348 thousand hectares of forest land i.e. more than 9 percent of the total forest covers had been transformed to the other land-use/land cover categories. During that phase, shrub land doubled from 689.9 thousand hectares (4.7 %) to 1,559.2 thousand hectares (10.6 %). Combining the forests and shrub lands (woody vegetation) as one, yearly about 29 thousand hectares of woody vegetation areas can be found converted to non-woody vegetation areas. This is a clear indication that forest resources were subjected to exploitation beyond its sustainable growth and use.

About 80 % of total energy consumption in Nepal is obtained from fuel wood, of which about 63 % comes from forestland (WECS, 2001). Of the total fuel wood consumption, only 27 % is estimated to have been extracted on a sustainable basis, and the remaining from over- cutting.. The actual annual growth rate is below the standard growth rate and varies from 0.59 to 2.34 tons dry matter per hectare per year (WECS, 2001).

Indigenous practices like Agro-forestry in the hilly region of Nepal and private plantations in Terai and community forest management have resulted in positive impact on tree-stock. Especially the fodder species and plantation for timber in the farmlands and in the non-cultivated land are common. Agriculture Census of Nepal (1991) has revealed that the woodlands and forest have increased from 15,000 hectares in 1981 to 109,000 hectares in 1991 (Environment Statistics, 1998) in private lands. On considering the average number of 408 trees per hectare from National Forest Inventory (NFI), it is estimated that 300 million trees exist outside the forest area in Nepal. Annual carbon removal due to the growing stock is obtained by multiplying the carbon content factor by net biomass growth. Calculation shows that about 14,737 Gigagram of CO2was removed from the atmosphere due to the growing stock in Nepal’s forest.

Biomass stock per hectare in Nepal’s forestland varies from 115 to 178 tons (WECS 2001). Entirely, about 14,006 kilo tons of biomass are removed from the different forestlands and other lands by cutting the trees. In Nepal, commercial harvest is not in practice. Forestland, in general, is changed in two-step process, the first from forestland to shrub land and the second from shrub to cultivation. The biomass in shrub land after conversion is assumed to be 16.1 tons per ha (WECS, 2001) whereas average biomass in the cultivation land is assumed to be 10 tons per ha (IPCC, 1996).

All the biomass removed from the forest is not consumed as fuel wood. Out of the total biomass loss from the forest clearing, 20 % is estimated for the purpose of using them for timbers (DFRS, 1993) that last up to few decades. During the period of 1978/79 to 1994/95, altogether 1.3 million hectare of forest was cleared (74 thousands hectare per year). In total 14 million tons of wood was removed from forest clearing releasing more than 18,547 Gigagram of CO2 to the atmosphere.

Conversion of forests to other land-use type affects the soil carbon. Forest soils are rich in organic matter than the land used for other purposes. Once deforestation occurs, the soils gradually lose its carbon content over the time. In such condition, temperature also disturbs the process of decomposition. In the higher altitude area (cold climate) the decay process is slower than in the Terai and Siwaliks regions (tropical climate). There is no thorough information of soil carbon content. Land system map prepared by LRMP has estimated organic matter content in the various lands and physiographic regions of Nepal. Soil carbon release estimation, as per IPCC Guidelines, is found altogether 23.71 Terragram (23.71 million tons) during the period from 1974 to 1994 (20 years) which is due to change in land-use from high carbon content soils (forest/shrub soils) to low carbon content soils (cultivation).

For a number of countries, carbon sequestration through forestation or retarded deforestation may be a cost-effective approach to contributing to reduced global atmospheric concentrations of CO2. So a variety of sustainable management approaches can improve carbon sequestration in existing forests. Allowing trees to grow for longer periods between harvests, planting longer-lived tree species (e.g., red oak, white pine, red spruce, hemlock), and setting aside wider buffer zones around streams and rivers have all been shown to increase carbon storage in forests.

References:
1. Ministry of Agriculture and Cooperatives, June 2007, Government of Nepal, “Melting Ice: A Hot Topic?”, The Journal of Agriculture and Environment,Vol:8.
2. MOPE/UNEP, June 2004, First Initial National Communication to the Conference of the Parties of the United Nations Framework Convention on Climate Change, Nepal.
3. Union of Concerned Scientists Citizens and Scientists for Environmental Solutions Catalyst,Vol.3 No.2 Fall 2004,http://www.ucsusa.org/
4. US Department of Energy, Office of Science,Science for America’s Future, http://www.science.doe.gov/
5. Wikipedia,Carbon capture and storage, Available at: http://en.wikipedia.org/wiki/Carbon_capture_and_storage

Tuesday, August 19

GREENHOUSE EFFECT TO CLIMATE CHANGE

SOME MILESTONE PROGRESS


In 1820, Frenchman Fourier has described Greenhouse effect for the first time as, "THE ATMOSPHERE acts like a hot house, because it lets through the lights rays of the sun but remains the dark from the ground."


In 1861, Greenhouse gases, water-vapor and carbon-dioxide, were first recognized by Tyndall in England who measured the absorption of heat radiation by water-vapor and carbon-dioxide.


In 1896, Swede Arrhenius tried to correlate change in surface temperature of the Earth with changes in atmosphere CO2 to explain the occurrence of ice age.


In 1903, Arrhenius noted that industry might put out enough CO2 to actually warm the Earth.


In 1938, Englishman Callendar published a paper on the artificial production of CO2 and its influence on climate where he tried to explain the temperature increases that were occurring at the time.


In 1940, Temperature trend has changed, the northern hemisphere started to cool and so Callander's work was no longer immediately relevant.


In 1955, Concerns for scientific community begun. The Hungarian-American von Neuman in a popular article posed the question "Can we survive technology?"in context of climate change.


In 1959The American scientist Plass purposed the Carbon-dioxide Theory of Climate Change.


Mid-1960s, political level discussion started.


In 1970s, the tone changed and global cooling issues arises focusing on aerosol emissions from industry and CFCs and its potential to destroy the layer of the stratospheric ozone were identified.


In 1974, Manabe presents first computer models of climate change which altered many scientists to the fact that human activities could also affect climate on a global scale.


In 1979, First World Climate Conference in Geneva, Climate Warming once again came into focus.


In 1980, Expert meeting in Villach, Austria; UNEP/WMO/ICSU remarked that CO2 induced climate change indeed was a major issue.


In 1983, Us Environment Protection agency (EPA) concluded that only a ban on coal-use, instituted before 2000, would effectively slow down the rate of global temperature changed and delay at 2°C increases until 2055.


In 1985, International Scientific Community meets at Villach in Austria. Scientific Committee on Problems of the Environment (SCOPE) had commissioned a review, resulting in the report 'The Greenhouse Effect, Climate Change and Ecosystems", which clearly establish increases in GHGs as an international problem.


In 1987, further scientific meeting along with accompanying press coverage gave the issue world-wide attention as discovery of OZONE HOLE over Antarctica and international agreements to limit emissions of CFCs.


In 1988, Toronto Conference on Changing Atmosphere, it started formulating political goals, resulted in a call for a reduction of carbon dioxide emissions by approximately 20 percent of 1988 levels by the year 2005, as an initial global goal. Nothing more than a call.


In 1988, Establishment of Intergovernmental Panel on Climate Change (IPCC) under auspices of the World Meteorological Organization (WMO) and United Nations Environment Programme (UNEP).


In 1990, the IPCC adopted its first assessment report on 30 August 1990 in Sundsvall, Sweden..
In 1992 IPCC Supplementary Reports.
In 1994 IPCC Special Report.
In 1992 Adoption of the UNFCCC.
In 1994 Entry into force of the UNFCCC.
In 1995 COP-1 and every year Conferences of the Parties (COP) meeting will take place in different places.
In 1995 Second IPCC Assessment Report.
In 1997 COP-3, the Berlin Mandate process led to the adoption of the Kyoto Protocol.
In 2001 Third IPCC Assessment Report.
In 2007 Fourth IPCC Assessment Report.
In 2007 December Australia signed KYOTO PROTOCOL.

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