TY - JOUR
T1 - Application of quikSCAT backscatter to SMAP validation planning
T2 - Freeze/Thaw state over ALECTRA sites in Alaska from 2000 to 2007
AU - Colliander, Andreas
AU - McDonald, Kyle
AU - Zimmermann, Reiner
AU - Schroeder, Ronny
AU - Kimball, John S.
AU - Njoku, Eni G.
PY - 2012/2
Y1 - 2012/2
N2 - 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.
AB - 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.
KW - Alaska Ecological Transect (ALECTRA)
KW - Quick Scatterometer (QuikSCAT)
KW - Soil Moisture Active Passive (SMAP)
KW - freeze/thaw state
UR - http://www.scopus.com/inward/record.url?scp=84856329928&partnerID=8YFLogxK
U2 - 10.1109/TGRS.2011.2174368
DO - 10.1109/TGRS.2011.2174368
M3 - Article
AN - SCOPUS:84856329928
SN - 0196-2892
VL - 50
SP - 461
EP - 468
JO - IEEE Transactions on Geoscience and Remote Sensing
JF - IEEE Transactions on Geoscience and Remote Sensing
IS - 2
M1 - 6112797
ER -
