ISRO Geosphere Biosphere Programme is focused to understand the Land-Air-Ocean interactions through Geosphere-Biosphere-Atmospheric mass and energy exchange processes that contribute to the overall understanding of parameters responsible for our climate change. The programme has nine major projects covering distinct and cross cutting subjects. NESAC has been identified as one of the major centers for conducting some of the studies under this programme. NESAC has, so far, been contributing in four of the projects as mentioned below:
- Aerosol Radiative Forcing over India
- Atmospheric Boundary Layer Characterization
- Atmospheric Trace Gases Chemistry, Transport and Modeling (AT-CTM)
- National Carbon Project (NCP)
Aerosol Radiative Forcing over India (ARFI)
The project is coordinated from Space Physics Laboratory, Thiruvanandapuram. At NESAC the objective of the programme is to characterize regional aerosol through long term station measurements and campaigns. Different optical, physical, and Chemical properties of aerosol like, size distribution, number concentration, optical depth, mass concentration, aerosol type, etc are measured and used in the models to estimate the radiative forcings of the aerosol. The direct and indirect effects of aerosol are studied in detail to understand the aerosol-cloud interaction. As NER is a land locked area cobered by hills all around with the Brahamaputra plains at the centre, the contribution of long range transport on total regional aerosol load forms large part of the study.
Figure : Diurnal and seasonal variation of aerosol black carbon over Umiam
Figure : Monthly averaged spectral aerosol optical depth
Atmospheric Boundary Layer Characterization
The boundary layer plays a very critical role in modulating the local weather. The data from three instruments (SODAR, mini boundary layer mast, and Pisharoty Sonde) are used to estimate the evolution of atmospheric boundary layer. Information on the boundary layer shall be incorporated in the numerical weather prediction models to improve the accuracy of the models. The information shall also be used in modeling the dispersion of various trace and green house gases.
Atmospheric Trace Gases Chemistry, Transport and Modeling (AT-CTM)
Process initiated to procure Online analysers for SOx, NOx, CO, CH4,O3 gases along with calibration system, data logger and other accessories.
National Carbon Project