About Us
Scientists at the Centre for Climate Change Research (CCCR), Indian Institute of Tropical Meteorology (IITM) develop Earth System Model (ESM) to improve our understanding of the climate system. IITM-ESM generates projections of the future changes in climate and provides scientific inputs for framing adaptation and mitigation policies.
IITM-ESM Brief History
The Ministry of Earth Sciences (MoES), Govt. of India and the National Oceanic and Atmospheric Administration (NOAA), USA, entered into a formal agreement to collaborate on the implementation of the National Centers for Environmental Prediction (NCEP) weather and seasonal prediction system in India during 2011. As part of this collaboration, the India Meteorology Department (IMD) and National Centre for Medium Range Weather Forecasts (NCMRWF) implemented the high-resolution atmospheric Global Forecast System model with three-dimensional variational data assimilation at IMD for short- and medium-range weather forecasts. The coupled ocean–atmosphere model, Climate Forecast System version 2 (CFSv2), with a high-resolution atmosphere, was implemented for seasonal prediction at the Indian Institute of Tropical Meteorology (IITM). To address the long-term critical need in India for a climate model that would provide reliable future projections of Indian monsoon rainfall, IITM planned to build an Earth system model (ESM) based on the CFSv2 framework.
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Atmosphere and Land Components
The atmospheric component of IITM-ESMv1 is based on the NCEP GFS model and has a spectral triangular truncation of 126 waves (T126) in the horizontal (∼0.9° grid) and finite differencing in the vertical with 64 sigma-pressure hybrid layers. It employs the simplified Arakawa–Schubert convection scheme, with cumulus momentum mixing. The land surface model (LSM) is the Noah LSM, with four layers (Ek et al. 2003), as in CFSv2. Further details can be found in Saha et al. (2010).
Ocean and sea ice components
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Biogeo-chemistry
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Atmosphere
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Land Components
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