Application of quikSCAT backscatter to SMAP validation planning: Freeze/Thaw state over ALECTRA sites in Alaska from 2000 to 2007

Andreas Colliander, Kyle McDonald, Reiner Zimmermann, Ronny Schroeder, John S. Kimball, Eni G. Njoku

Research output: Contribution to journalArticlepeer-review

Abstract

The mapping of the predominant freeze/thaw state of the landscape is one of the main objectives of the National Aeronautics and Space Administration's proposed Soil Moisture Active Passive (SMAP) mission. This study applies Alaska Ecological Transect (ALECTRA) biophysical network temperature measurements and satellite radar scatterometer data from the Quick Scatterometer (QuikSCAT) to evaluate some of the validation issues regarding the planned SMAP freeze/thaw measurements. Although the QuikSCAT data are acquired at Ku-band frequency, rather than at the L-band frequency of the proposed SMAP instrument, QuikSCAT data do provide a high temporal fidelity over the ALECTRA sites, similar to SMAP. The results of this study show that multiple temperature measurements representative of individual landscape components (soil, snow cover, vegetation, and atmosphere) covering different types of terrain within the satellite field of view are important for understanding the freeze/thaw process and the aggregate radar backscatter response to that process. The backscatter temporal dynamics and relative contribution of the freeze/thaw state of these landscape elements to radar signal vary with land cover, seasonal weather, and climate conditions.

Original languageEnglish
Article number6112797
Pages (from-to)461-468
Number of pages8
JournalIEEE Transactions on Geoscience and Remote Sensing
Volume50
Issue number2
DOIs
StatePublished - Feb 2012

Keywords

  • Alaska Ecological Transect (ALECTRA)
  • freeze/thaw state
  • Quick Scatterometer (QuikSCAT)
  • Soil Moisture Active Passive (SMAP)

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