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Comparison of AMSR-E and TMI sea surface temperature with Argo near-surface temperature over the Indian Ocean

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Sea surface temperature (SST) measurements from the Advanced Microwave Scanning Radiometer for the Earth Observing System (AMSR-E) and the Tropical Rainfall Measuring Mission (TRMM) Microwave Imager (TMI) are compared with near-surface temperature (foundation SST) in situ measurements obtained from Argo floats over the Indian Ocean. Spatial variation was compared for 2002-2006 and 11 floats were used for temporal variation collocated observations. The results show that TMI and AMSR-E SST measurements are slightly overestimated during the pre- and post-monsoon seasons and underestimated during the monsoon season. Statistical analysis shows that the SST from the AMSR-E is better correlated with the Argo foundation SST compared to the TMI. The standard deviation (SD) and root mean square error (RMSE) for AMSR-E SST are 0.58°C and 0.35°C, respectively, over the Equatorial Indian Ocean (EIO). The corresponding values for the TMI are 0.66°C and 0.47°C. Over the Arabian Sea the SD values are slightly higher compared to the EIO values, whereas RMSE values are less for both TMI and AMSR-E SST. These retrieval accuracies are above the expected retrieval accuracy. The seasonal average spatial distribution of AMSR-E SST shows a better match with the Argo foundation SST compared to TMI SST distributions. The robustness of the good spatial match during the monsoon season may be attributed to strong winds.
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Document Type: Research Article

Affiliations: 1: Indian National Centre for Ocean Information Services (INCOIS), Ministry of Earth Sciences (MoES), Hyderabad 500055, India 2: Department of Atmospheric and Space Sciences, University of Pune, Pune, India

Publication date: 2009-01-01

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