气候变化领域集成服务门户(CCPortal): Quadruple Collocation Analysis of In-Situ, Scatterometer, and NWP Winds

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DOI	10.1029/2021JC017189
	Quadruple Collocation Analysis of In-Situ, Scatterometer, and NWP Winds
	Vogelzang J.; Stoffelen A.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	Triple collocation is an established technique for retrieving linear calibration coefficients and observation error variances of a physical quantity observed simultaneously by three different observation systems. The formalism is extended to an arbitrary number of systems, and representativeness errors and associated cross-covariances are included in a natural way. It is applied to quadruple collocations of ocean surface vector winds from two scatterometers (ASCAT-A, ASCAT-B, or ScatSat), buoy measurements, and NWP model forecasts. There are 15 possible sets of quadruple collocation equations, 12 of which are solvable for the essential variables (calibration coefficients, observation error variances, and common variance) as well as two additional error covariances, each set leading to a different solution. The quadruple collocation equations by themselves give little information on the representativeness errors involved; these have to be estimated using other methods. The spreading in the solutions is a measure of the accuracy of the underlying error model. Variation of the scale at which the spatial variances are evaluated yields an optimal scale of 100–200 km. From triple collocation subsets the error in the scatterometer error standard deviations is found to be 0.03–0.05 m s−1, more than expected on statistical grounds. A more precise determination requires an error model that better describes the data error properties. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	ASCAT; measurement accuracy; ocean surface wind; quadruple collocation; ScatSat; triple collocation
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186349
作者单位	Royal Netherlands Meteorological Institute KNMI, De Bilt, Netherlands
推荐引用方式 GB/T 7714	Vogelzang J.,Stoffelen A.. Quadruple Collocation Analysis of In-Situ, Scatterometer, and NWP Winds[J],2021,126(5).
APA	Vogelzang J.,&Stoffelen A..(2021).Quadruple Collocation Analysis of In-Situ, Scatterometer, and NWP Winds.Journal of Geophysical Research: Oceans,126(5).
MLA	Vogelzang J.,et al."Quadruple Collocation Analysis of In-Situ, Scatterometer, and NWP Winds".Journal of Geophysical Research: Oceans 126.5(2021).