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Article: Estimating the broadband longwave emissivity of global bare soil from the MODIS shortwave albedo product

TitleEstimating the broadband longwave emissivity of global bare soil from the MODIS shortwave albedo product
Authors
Issue Date2014
Citation
Journal of Geophysical Research, 2014, v. 119, n. 2, p. 614-634 How to Cite?
AbstractA constant land surface longwave emissivity value, or very simple parameterization, has been adopted by current land surface models because of a current lack of reliable observations. Of all the various Earth surface types, bare soil has the highest variations in broadband emissivity (BBE). We propose here a new algorithm to estimate BBE in the 8–13.5µm spectral range based on the Moderate Resolution Imaging Spectrometer (MODIS) albedo product for bare soil. This algorithm takes advantage of both Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) longwave emissivity and MODIS shortwave albedo products, as well as the established linear relationship between ASTER BBE and seven MODIS spectral albedos for bare soil. In order to mitigate step discontinuities in the global land surface BBE product, a transition zone was established and the BBE estimation method was also provided. Three linear formulae were derived for bare soil and transition zones, respectively. Given the accuracy of 0.01 for MODIS spectral albedo, the absolute accuracy of BBE retrieval is better than 0.017. The validation results obtained from the three field trials conducted in China and one field trial in western/southwestern U.S. indicated that the average difference between the estimated BBE and the measured BBE was 0.016. We have introduced a new strategy to generate global land surface BBE using MODIS data. This strategy was used to generate global 8day 1km land surface BBE products from 2000 through 2010.
Persistent Identifierhttp://hdl.handle.net/10722/321583
ISSN
2015 Impact Factor: 3.318
2020 SCImago Journal Rankings: 1.670

 

DC FieldValueLanguage
dc.contributor.authorCheng, Jie-
dc.contributor.authorLiang, Shunlin-
dc.date.accessioned2022-11-03T02:20:02Z-
dc.date.available2022-11-03T02:20:02Z-
dc.date.issued2014-
dc.identifier.citationJournal of Geophysical Research, 2014, v. 119, n. 2, p. 614-634-
dc.identifier.issn0148-0227-
dc.identifier.urihttp://hdl.handle.net/10722/321583-
dc.description.abstractA constant land surface longwave emissivity value, or very simple parameterization, has been adopted by current land surface models because of a current lack of reliable observations. Of all the various Earth surface types, bare soil has the highest variations in broadband emissivity (BBE). We propose here a new algorithm to estimate BBE in the 8–13.5µm spectral range based on the Moderate Resolution Imaging Spectrometer (MODIS) albedo product for bare soil. This algorithm takes advantage of both Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) longwave emissivity and MODIS shortwave albedo products, as well as the established linear relationship between ASTER BBE and seven MODIS spectral albedos for bare soil. In order to mitigate step discontinuities in the global land surface BBE product, a transition zone was established and the BBE estimation method was also provided. Three linear formulae were derived for bare soil and transition zones, respectively. Given the accuracy of 0.01 for MODIS spectral albedo, the absolute accuracy of BBE retrieval is better than 0.017. The validation results obtained from the three field trials conducted in China and one field trial in western/southwestern U.S. indicated that the average difference between the estimated BBE and the measured BBE was 0.016. We have introduced a new strategy to generate global land surface BBE using MODIS data. This strategy was used to generate global 8day 1km land surface BBE products from 2000 through 2010.-
dc.languageeng-
dc.relation.ispartofJournal of Geophysical Research-
dc.titleEstimating the broadband longwave emissivity of global bare soil from the MODIS shortwave albedo product-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/2013JD020689-
dc.identifier.scopuseid_2-s2.0-84900196567-
dc.identifier.volume119-
dc.identifier.issue2-
dc.identifier.spage614-
dc.identifier.epage634-
dc.identifier.eissn2156-2202-

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