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Homogeneity of a Global Multisatellite Soil Moisture Climate Data RecordClimate Data Records (CDR) that blend multiple satellite products are invaluable for climate studies, trend analysis and risk assessments. Knowledge of any inhomogeneities in the CDR is therefore critical for making correct inferences. This work proposes a methodology to identify the spatiotemporal extent of the inhomogeneities in a 36-year, global multisatellite soil moisture CDR as the result of changing observing systems. Inhomogeneities are detected at up to 24 percent of the tested pixels with spatial extent varying with satellite changeover times. Nevertheless, the contiguous periods without inhomogeneities at changeover times are generally longer than 10 years. Although the inhomogeneities have measurable impact on the derived trends, these trends are similar to those observed in ground data and land surface reanalysis, with an average error less than 0.003 cubic meters per cubic meter per year. These results strengthen the basis of using the product for long-term studies and demonstrate the necessity of homogeneity testing of multisatellite CDRs in general.
Document ID
20160014923
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Su, Chun-Hsu
(Melbourne Univ. Victoria, Australia)
Ryu, Dongryeol
(Melbourne Univ. Victoria, Australia)
Dorigo, Wouter
(Technische Univ. Vienna, Austria)
Zwieback, Simon
(Eidgenoessische Technische Hochschule Zurich, Switzerland)
Gruber, Alexander
(Technische Univ. Vienna, Austria)
Albergel, Clement
(CNRM Toulouse, France)
Reichle, Rolf H.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Wagner, Wolfgang
(Technische Univ. Vienna, Austria)
Date Acquired
December 30, 2016
Publication Date
November 3, 2016
Publication Information
Publication: Geophysical Research Letters
Publisher: American Geophysical Union
Volume: 43
Issue: 21
Subject Category
Meteorology And Climatology
Earth Resources And Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN38400
Distribution Limits
Public
Copyright
Other
Keywords
CDR
ESA

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