"Clarifications on the “Comparison Between SMOS, VUA, ASCAT, and ECMWF Soil Moisture Products Over Four Watersheds in U.S.

W. Wagner, L Brocca, V. Naeimi, R. Reichle, C. Draper, R.A.M. de Jeu, D. Ryu, S. Chun-Hsu, A. Western, J.C. Calvet, Y.H. Kerr, D.J. Leroux, M. Drusch, T.J. Jackson, S. Hahn, W. Dorigo, C. Paulik

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

In a recent paper, Leroux compared three satellite soil moisture data sets (SMOS, AMSR-E, and ASCAT) and ECMWF forecast soil moisture data to in situ measurements over four watersheds located in the United States. Their conclusions stated that SMOS soil moisture retrievals represent "an improvement [in RMSE] by a factor of 2-3 compared with the other products" and that the ASCAT soil moisture data are "very noisy and unstable." In this clarification, the analysis of Leroux is repeated using a newer version of the ASCAT data and additional metrics are provided. It is shown that the ASCAT retrievals are skillful, although they show some unexpected behavior during summer for two of the watersheds. It is also noted that the improvement of SMOS by a factor of 2-3 mentioned by Leroux is driven by differences in bias and only applies relative to AMSR-E and the ECWMF data in the now obsolete version investigated by Leroux © 2013 IEEE.
Original languageEnglish
Pages (from-to)1901-1906
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume52
Issue number3
DOIs
Publication statusPublished - 2014

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