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dc.contributor.authorGuo, Jinyunen_US
dc.contributor.authorYang, Leien_US
dc.contributor.authorLiu, Xinen_US
dc.contributor.authorChang, Xiaotaoen_US
dc.contributor.authorHwang, Cheinwayen_US
dc.date.accessioned2014-12-08T15:34:25Z-
dc.date.available2014-12-08T15:34:25Z-
dc.date.issued2013-08-01en_US
dc.identifier.issn1017-0839en_US
dc.identifier.urihttp://dx.doi.org/10.3319/TAO.2012.11.01.01en_US
dc.identifier.urihttp://hdl.handle.net/11536/23560-
dc.description.abstractThe backscatter coefficient, known as sigma0, is an important measurement of satellite radar altimetry and a key parameter for land altimetry because of its close relationship with the physical properties and geometric features of land coverage under global/regional climate change effects. Using the TOPEX/Poseidon GDR-M dataset from January 1993 to December 2004, we study the spatial and temporal distribution of sigma at bands Ku and C over Xinjiang, western China. The results show that the sigma0 is influenced by the water distribution over land and the time evolution of sigma0 has clear seasonal changes. River basins or deserts are classified over the spatial distribution based on different sigma0 values. For example, high sigma0 values are found in the Tarim River Basin and low values are found in the Taldimakan Desert. The periodic components of sigma0 time series are determined using the fast Fourier transformation method. The annual variation is the dominating cycle and the semi-annual variation is the secondary signal. The amplitudes of sigma0 time series at bands Ku and C are also given and most areas have quite low amplitudes except for the Tarim River Basin. Several areas including the Tarim River Basin, Tianshan Mountain and Taldimakan Desert are selected for sigma0 time series spacial analysis to discuss the reasons for variations in sigma0. The main factors are precipitation and vegetation growth, which are affected by the global/regional climate change. The correlation between the brightness temperature, which is related to the water-vapor content in the atmosphere measured by TMR at the 21 GHz channel and sigma0 at two bands, is analyzed.en_US
dc.language.isoen_USen_US
dc.subjectXinjiangen_US
dc.subjectSatellite radar ahimetryen_US
dc.subjectBackscatter coefficienten_US
dc.subjectGeographical condition monitoringen_US
dc.subjectTOPEX/Poseidonen_US
dc.titleDecadal Variation in Surface Characteristics over Xinjiang, Western China, from TAP Altimetry Backscatter Coefficients: Evidence of Climate Changeen_US
dc.typeArticleen_US
dc.identifier.doi10.3319/TAO.2012.11.01.01en_US
dc.identifier.journalTERRESTRIAL ATMOSPHERIC AND OCEANIC SCIENCESen_US
dc.citation.volume24en_US
dc.citation.issue4en_US
dc.citation.spage565en_US
dc.citation.epage579en_US
dc.contributor.department土木工程學系zh_TW
dc.contributor.departmentDepartment of Civil Engineeringen_US
dc.identifier.wosnumberWOS:000329894700010-
dc.citation.woscount0-
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