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Merging daily sea surface temperature data from multiple satellites using a Bayesian maximum entropy method |
Shaolei TANG1,2, Xiaofeng YANG1(), Di DONG1,2, Ziwei LI1 |
1. State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China 2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Sea surface temperature (SST) is an important variable for understanding interactions between the ocean and the atmosphere. SST fusion is crucial for acquiring SST products of high spatial resolution and coverage. This study introduces a Bayesian maximum entropy (BME) method for blending daily SSTs from multiple satellite sensors. A new spatiotemporal covariance model of an SST field is built to integrate not only single-day SSTs but also time-adjacent SSTs. In addition, AVHRR 30-year SST climatology data are introduced as soft data at the estimation points to improve the accuracy of blended results within the BME framework. The merged SSTs, with a spatial resolution of 4 km and a temporal resolution of 24 hours, are produced in the Western Pacific Ocean region to demonstrate and evaluate the proposed methodology. Comparisons with in situ drifting buoy observations show that the merged SSTs are accurate and the bias and root-mean-square errors for the comparison are 0.15°C and 0.72°C, respectively.
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Keywords
sea surface temperature (SST)
Bayesian maximum entropy (BME)
remote sensing
data fusion
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Corresponding Author(s):
Xiaofeng YANG
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Just Accepted Date: 20 July 2015
Online First Date: 22 October 2015
Issue Date: 30 October 2015
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