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A comparison study on empirical microwave soil moisture downscaling methods based on the integration of microwave-optical/IR data on the Tibetan Plateau
Zhao, Wei; Li, Ainong
Corresponding AuthorAinong Li
2015
Source PublicationINTERNATIONAL JOURNAL OF REMOTE SENSING
ISSN0143-1161
EISSN1366-5901
Volume36Issue:19-20Pages:4986-5002
SubtypeArticle; Proceedings Paper
AbstractSoil moisture plays a vital role in land surface energy and the water cycle. Microwave remote sensing is widely used because of the physically based relationship between the land surface emission observed and soil moisture. However, the application of retrieved soil moisture data is restricted by its coarse spatial resolution. To overcome this weakness, downscaling methods should be developed to disaggregate coarse resolution microwave soil moisture data to fine resolution. The traditional method is the microwave-optical/IR synergistic approach, in which land surface temperature, vegetation index, and surface albedo are key parameters. Five purely empirical methods based on the triangle feature are selected in this study. To evaluate their performance on downscaling microwave soil moisture, these methods are applied to the Zoige Plateau in China using the Advanced Microwave Scanning Radiometer on the Earth Observing System (AMSR-E) Land Parameter Retrieval Model (LPRM) soil moisture product and Moderate Resolution Imaging Spectroradiometer (MODIS) optical/IR products. The coarse-resolution AMSR-E LPRM soil moisture data are disaggregated into the high resolution of the MODIS product, and the surface soil moisture measurements of the Maqu soil moisture observation network located in the plateau are used to validate the downscaling results. Results show that (1) the relationship models used in these methods can generally capture the variation in soil moisture, with R-2 around 0.6, but have a relatively high uncertainty under conditions of high soil moisture; (2) the methods can provide high-resolution soil moisture distribution, but the downscaled soil moisture presents a low level correlation with field measurements at different spatial and temporal scales. This comparative study provides insight into the performance of popular purely empirical downscaling methods on enhancing the spatial resolution of soil moisture on the Tibetan Plateau. Although synergistic methods can improve the spatial resolution of AMSR-E soil moisture data, additional studies are needed to exclude the uncertainty from AMSR-E soil moisture estimation, the low sensitivity of the relationship model under high soil moisture, and the spatial representativeness difference between coarse pixels and point measurement.
KeywordSoil Moisture
WOS HeadingsScience & Technology ; Technology
DOI10.1080/01431161.2015.1041178
URL查看原文
WOS Subject ExtendedRemote Sensing ; Imaging Science & Photographic Technology
Indexed BySCI
WOS KeywordLAND-SURFACE TEMPERATURE ; AMSR-E ; VEGETATION INDEX ; THERMAL INERTIA ; HIGH-RESOLUTION ; MODIS PRODUCTS ; RETRIEVAL ; SATELLITE ; DISAGGREGATION ; EVAPOTRANSPIRATION
Language英语
Quartile3区
TOP
WOS SubjectRemote Sensing ; Imaging Science & Photographic Technology
WOS IDWOS:000364334500013
Funding OrganizationInternational Cooperation Partner Program of Innovative Team of the Chinese Academy of Sciences(KZZD-EW-TZ-06) ; National Natural Science Foundation of China(41271433 ; West Light Foundation of the Chinese Academy of Sciences ; 'Hundred Talents' Project ; 41401425)
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Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/10837
Collection数字山地与遥感应用中心
AffiliationChinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
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Zhao, Wei,Li, Ainong. A comparison study on empirical microwave soil moisture downscaling methods based on the integration of microwave-optical/IR data on the Tibetan Plateau[J]. INTERNATIONAL JOURNAL OF REMOTE SENSING,2015,36(19-20):4986-5002.
APA Zhao, Wei,&Li, Ainong.(2015).A comparison study on empirical microwave soil moisture downscaling methods based on the integration of microwave-optical/IR data on the Tibetan Plateau.INTERNATIONAL JOURNAL OF REMOTE SENSING,36(19-20),4986-5002.
MLA Zhao, Wei,et al."A comparison study on empirical microwave soil moisture downscaling methods based on the integration of microwave-optical/IR data on the Tibetan Plateau".INTERNATIONAL JOURNAL OF REMOTE SENSING 36.19-20(2015):4986-5002.
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