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Krishnamoorthy, C.
- On the Possibility of Retrieving Near-Surface Rain Rate from the Microwave Sounder Saphir of the Megha-Tropiques Mission
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Authors
Affiliations
1 Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
1 Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
Source
Current Science, Vol 106, No 4 (2014), Pagination: 587-593Abstract
In this study, ab initio atmospheric profiles generated through high-resolution calculations from the community weather model WRF, suitably matched up with both TRMM Microwave Imager (TMI) and Precipitation Radar (PR) instruments of the TRMM satellite were used to compute simulated brightness temperatures (BTs) corresponding to SAPHIR frequencies, through an in-house polarized radiative transfer code. An artificial neural network was then constructed and trained to return the near-surface rain (NSR) rate given the six BTs corresponding to SAPHIR. For accomplishing the retrievals, measured BTs of SAPHIR (level 1 data) were used. NSR rates were calculated for two precipitating systems, namely (i) cyclone Neelam and (ii) cyclone Phailin. Rain rates thus estimated were then validated with the TMI-PR combined rain product of TRMM (2A12). The results showed that there is good agreement between the two. An inter-comparison between rain rates derived from MADRAS and SAPHIR was also done. This unexpected ability of the SAPHIR radiances provide us with the rainfall signature opens up new vistas in achieving the mission objectives of Megha-Tropiques.Keywords
Brightness Temperatures, Megha-Tropiques, Neelam, Phailin, SAPHIR.Full Text
- Impact of Cloud Parameterization Schemes on The Simulation of Cyclone Vardah using the WRF Model
Abstract Views :233 |
PDF Views:85
Authors
Affiliations
1 Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
1 Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, IN
Source
Current Science, Vol 115, No 6 (2018), Pagination: 1143-1153Abstract
The objective of this study is to examine the sensitivity of cumulus and microphysics schemes when simulating the track, intensity and inner core structure of the very severe cyclonic storm (VSCS) Vardah using the Weather Research and Forecasting (WRF) model. Four cumulus parameterization schemes (CPS) and six microphysics schemes (MPS) were used. Both the track and intensity of cyclone Vardah are seen to be sensitive to the CPS and MPS. New simplified Arakawa– Schubert scheme (NSAS) as CPS and Kessler scheme (KS) as MPS combination has better predicted the track and intensity of the cyclone with respect to the Indian Meteorological Department (IMD) data when compared to other schemes. To verify the robustness of the best set of schemes for cyclone Vardah, two random sets of schemes as well as the best set of schemes were run for cyclones Hudhud and Thane.Keywords
Cyclone Vardah, Cumulus Parameterization, Microphysics Parameterization, WRF Model.Full Text
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