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Remote Sens. 2018, 10(1), 90; https://doi.org/10.3390/rs10010090

The Role of Advanced Microwave Scanning Radiometer 2 Channels within an Optimal Estimation Scheme for Sea Surface Temperature

1
Department of Meteorology, University of Reading, P.O. Box 243, Reading RG6 6BB, UK
2
National Centre for Earth Observation, Department of Meteorology, University of Reading, P.O. Box 243, Reading RG6 6BB, UK
3
European Space Agency, ESTEC, Postbus 299, 2200 AG Noordwijk, The Netherlands
*
Author to whom correspondence should be addressed.
Received: 10 November 2017 / Revised: 18 December 2017 / Accepted: 4 January 2018 / Published: 11 January 2018
(This article belongs to the Collection Sea Surface Temperature Retrievals from Remote Sensing)
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Abstract

We present an analysis of information content for sea surface temperature (SST) retrieval from the Advanced Microwave Scanning Radiometer 2 (AMSR2). We find that SST uncertainty of ∼0.37 K can be achieved within an optimal estimation framework in the presence of wind, water vapour and cloud liquid water effects, given appropriate assumptions for instrumental uncertainty and prior knowledge, and using all channels. We test all possible combinations of AMSR2 channels and demonstrate the importance of including cloud liquid water in the retrieval vector. The channel combinations, with the minimum number of channels, that carry most SST information content are calculated, since in practice calibration error drives a trade-off between retrieved SST uncertainty and the number of channels used. The most informative set of five channels is 6.9 V, 6.9 H, 7.3 V, 10.7 V and 36.5 H and these are suitable for optimal estimation retrievals. We discuss the relevance of microwave SSTs and issues related to them compared to SSTs derived from infra-red observations. View Full-Text
Keywords: AMSR2; sea surface temperature; optimal estimation AMSR2; sea surface temperature; optimal estimation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Pearson, K.; Merchant, C.; Embury, O.; Donlon, C. The Role of Advanced Microwave Scanning Radiometer 2 Channels within an Optimal Estimation Scheme for Sea Surface Temperature. Remote Sens. 2018, 10, 90.

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