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Validation of multi-channel scanning microwave radiometer on-board Oceansat-1

DRS at CSIR-National Institute of Oceanography

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Title Validation of multi-channel scanning microwave radiometer on-board Oceansat-1
 
Creator Muraleedharan, P.M.
Pankajakshan, T.
Harikrishnan, M.
 
Subject Indian Ocean
Sea surface temperature
moored buoy
microwave sensor
 
Description Sea surface temperature (SST), sea surface wind speed (WS) and columnar water vapour (WV) derived from Multi-frequency Scanning Microwave Radiometer (MSMR) sensor on-board IRS-P4 (Oceansat-1) were validated against the in situ measurements from ship, moored buoy (MB), drifting buoy (DB) and autonomous weather station (AWS). About 1400 satellite in situ match-ups were used for the validation of SST and WS, while only 60 match-ups were available for the validation of WV. Therefore specific humidity, Q sub(a) was used as a proxy for validating WV. The drifting buoy SSTs showed good correlation with the satellite values (r = 0.84). The correlation of MB SSTs was better during night when the WS varied between 0 and 10 m/s. During the day, correlation peaked for higher wind speeds (greater than 10 m/s). MB (r is greater than 0.80) was relatively better than AWS (r approx. 0.70) and ship (r is less than 0.50) for validating satellite-derived WS. Daytime winds exhibited better correlation with satellite values when measured from ocean platforms (MB and ship), but the winds measured from land-based platforms (AWS) were closer to satellite values during nighttime. Q sub(a) values consistently showed higher correlation with satellite values during nighttime. The low root mean square deviation (RMSD) of DB SST (1.17 degrees C) and MB WS (1.52 m s sup(-1)) is within the achievable accuracy of the microwave sensor when validated with data collected over the tropical Indian Ocean. The RMSD of Q sub(a) (1.81 g kg sup(-1)), however, falls much beyond the attainable accuracy of the microwave sensor.
 
Date 2006-09-01T05:19:18Z
2006-09-01T05:19:18Z
2004
 
Type Journal Article
 
Identifier Current Science, vol.87(3), 370-376p.
http://drs.nio.org/drs/handle/2264/319
 
Language en
 
Format 647168 bytes
application/pdf
 
Publisher Indian Academy of Sciences