Rabu, 25 Februari 2009

Geospatial Imaging for Climate Change

Geospatial Imaging for Climate Change presented in Plenary Sessions : Geospatial Imaging Technologies and Sustainable Development
Map World Forum 2009 - February 10, 2009 HICC, Hyderabad, India

Dr Shailesh Nayak, Secretary
Ministry of Earth Sciences, Government of India, India

The changes in atmospheric concentration of green house gases and aerosols, in solar radiation and land surface properties have altered the energy balance of the climate system of the earth. The increase in green house gases is primarily due to fossil fuel use, land use changes and agriculture. In order to understand the causes of change and their likely impact, the observation needs to encompass atmosphere (cloud properties, radiative energy fluxes, precipitation, aerosol properties, wind, humidity, temperature, etc), atmospheric chemistry, solar radiation, land (land cover, land use changes, vegetation dynamics, soil moisture, etc), ocean (temperature, salinity, phytoplankton, sea surface wind, sea surface topography) and cryosphere (land ice, sea ice, snow cover). During the last thirty years, host of satellites have provided very useful data on many of the above mentioned parameters. Microwave radiometers and optical multispectral data have provided vital data on changes in ice cover on polar regions and glacier retreat on Himalayas. Altimeters provided data on sea-level-rise and on ocean circulation especially during the last fifteen years. Thermal radiometers provided data on rise of sea surface temperature. The growth and decay of ozone hole over the years has been monitored by satellites. It is necessary to evolve a measurement strategy (overlap, sampling, calibration and data continuity) to improve accuracy and scientific content for future satellites.

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