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Remote Sens. 2017, 9(3), 245; doi:10.3390/rs9030245

A Lookup Table-Based Method for Estimating Sea Surface Hemispherical Broadband Emissivity Values (8–13.5 μm)

1
State Key Laboratory of Remote Sensing, School of Geography, Beijing Normal University, Beijing 100875, China
2
Department of Geographical Science, University of Maryland, College Park, MD 20742, USA
3
Earth Physics and Thermodynamics Department, University of Valencia, 50 Dr. Moliner, Burjassot E-46100, Spain
4
College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China
*
Author to whom correspondence should be addressed.
Academic Editors: Zhaoliang Li, Richard Müller and Prasad S. Thenkabail
Received: 7 December 2016 / Accepted: 3 March 2017 / Published: 6 March 2017
View Full-Text   |   Download PDF [6569 KB, uploaded 8 March 2017]   |  

Abstract

Sea surface hemispherical broadband emissivity (BBE, 8–13.5 μm) is a vital parameter for calculating surface radiation budgets. Such data are currently unavailable. This paper proposes a lookup table-based method for retrieving sea surface hemispherical BBE values. The physicallybased sea surface emissivity model of Wu and Smith, together with the optimal refractive index, were used to generate hemispherical BBE values under wind speeds ranging from zero to 50 m/s. A lookup table of hemispherical BBE values as a function of wind speed was established and used to retrieve sea surface hemispherical BBE values under foam-free conditions. The accuracy of the estimates of hemispherical BBE was 0.003, given a wind speed of zero. The foam effect was explicitly considered. After incorporating the foam effect, hemispherical BBE was expressed as a linear function of the hemispherical BBE values of sea water and foam, weighted by the fraction of foam coverage. With this method, we have produced an hourly sea surface hemispherical BBE product with a resolution of 10 km and global coverage that covers the period from 2003 to 2005, using wind speed data from Modern-Era Retrospective analysis for Research and Applications (MERRA)-2. View Full-Text
Keywords: emissivity; broadband emissivity; refractive index; foam; ocean; thermal infrared remote sensing emissivity; broadband emissivity; refractive index; foam; ocean; thermal infrared remote sensing
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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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Cheng, J.; Cheng, X.; Liang, S.; Niclòs, R.; Nie, A.; Liu, Q. A Lookup Table-Based Method for Estimating Sea Surface Hemispherical Broadband Emissivity Values (8–13.5 μm). Remote Sens. 2017, 9, 245.

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