Dr. Sujuan Wang Profile

Dr. Sujuan Wang

at National Satellite Meteorological Ctr

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Proceedings Article | 10 December 2014 Paper

FY-3C/VIRR SST algorithm and cal/val activities at NSMC/CMA

Sujuan Wang, Peng Cui, Peng Zhang, Maonong Ran, Feng Lu, Weihe Wang

Proceedings Volume 9261, 92610G (2014) https://doi.org/10.1117/12.2068773

KEYWORDS: Satellites, Algorithm development, Meteorological satellites, Infrared radiation, Sensors, Meteorology, Radiometry, Databases, Calibration, Visible radiation

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The National Satellite Meteorological Center (NSMC)/CMA global sea surface temperature (SST) data are derived from measurements made by the Visible and Infrared Radiometer (VIRR) on board the FY-3 series polar orbiting satellites. Quality controlled in situ data from iQUAM (STAR/NESDIS/NOAA) is used in FY-3B/C VIRR matching procedure. The monthly matchup database (MDB) is created from FY-3C VIRR measurements paired with coincident SST measurements from buoys since November 2013. The satellite sensor’s brightness temperature and buoy SST pairs are included in the MDB if they are coincident within 3km in space and 1 hour in time. Least-Square Regression is used for estimating the first-guess coefficient and SST residuals. Outliers are removed using Median±2STD, and the final coefficients of robust regression are estimated. A set of SST regression formalisms are tested base on NOAA- 19/AVHRR 2010 MDB. The test shows that, for daytime split-window nonlinear SST (NLSST) is the best, for nighttime triple-window MCSST (TCSST) is the best, which is agree with STAR/NESDIS’s. The same regression analysis method also used on FY-3C/VIRR MDB. Compare with the three daytime SST algorithms and five nighttime SST algorithms, the best algorithm to retrieve FY-3C/VIRR SST for daytime is NLSST and for nighttime is TCSST. Compare with the coefficients of nighttime algorithm TCSST, it shows that for FY-3B/C VIRR SST, the contribution of 3.7μm band is smaller than split-window bands. The performance of 3.7μm band of FY-3C/VIRR is better than FY-3B/VIRR, but worse than NOAA-19/AVHRR.

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