完整後設資料紀錄
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dc.contributor.authorGuo JinYunen_US
dc.contributor.authorYang Leien_US
dc.contributor.authorLiu Xinen_US
dc.contributor.authorHwang, CheinWayen_US
dc.contributor.authorYang Hongen_US
dc.date.accessioned2014-12-08T15:28:52Z-
dc.date.available2014-12-08T15:28:52Z-
dc.date.issued2012-12-01en_US
dc.identifier.issn1674-7313en_US
dc.identifier.urihttp://dx.doi.org/10.1007/s11430-012-4524-yen_US
dc.identifier.urihttp://hdl.handle.net/11536/20852-
dc.description.abstractThis paper deals with the backscatter coefficients known as sigma0 at Ku band and C band based on the GDR-M (Merged Geophysical Data Record) of TOPEX/Poseidon (T/P) through Jan. 1993 to Dec. 2004 over land surface of China. After smoothing and interpolating the backscatter coefficients for both bands, we achieve the 5'x5' grid data and the time series of backscatter coefficients in 12 years. The spatial distribution of sigma0 over typical areas (wetland, desert, mountainous area, agriculture base, etc.) of Chinese territory is analyzed and discussed. The fast Fourier transformation (FFT) is used to detect the cycles of seasonal variations of sigma0 time series and gives that the annual period is the major cycle. Meanwhile a semiannual period is also found in some places. We use the least squares method on both periods and find that the amplitude of annual period is obviously greater than that of semi-annual period. The relationship among the anomalousness of time series, variations of environment and climate change, and the serious natural calamity (flood, drought) is also discussed. Data of topography slope extracted from SRTM are used to do correlation analysis with the backscatter coefficients in parts of China to quantify the impact of slope on backscatter coefficients in Ku and C bands, and the results show that they all have a negative correlation but the magnitudes are different in different places with different coverages. Such as the area of Liaoning and Jilin has the maximum correlation -0.56, the Taklimakan Desert has the minimum correlation -0.11, and the other places commonly have correlations in (-0.3, -0.5).en_US
dc.language.isoen_USen_US
dc.subjectbackscatter coefficienten_US
dc.subjectsatellite altimetryen_US
dc.subjectTOPEX/Poseidonen_US
dc.subjectland surfaceen_US
dc.subjectSRTMen_US
dc.titleOn temporal-spatial distribution of backscatter coefficients over China determined by TOPEX/Poseidon missionen_US
dc.typeArticleen_US
dc.identifier.doi10.1007/s11430-012-4524-yen_US
dc.identifier.journalSCIENCE CHINA-EARTH SCIENCESen_US
dc.citation.volume55en_US
dc.citation.issue12en_US
dc.citation.spage2068en_US
dc.citation.epage2083en_US
dc.contributor.department土木工程學系zh_TW
dc.contributor.departmentDepartment of Civil Engineeringen_US
dc.identifier.wosnumberWOS:000312346200014-
dc.citation.woscount1-
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