Quikscat backscatter sensitivity to landscape freeze/thaw state over ALECTRA sites in Alaska from 2000 to 2007: Application to SMAP validation planning

2010 IEEE International Geoscience and Remote Sensing Symposium Pub Date : 2010-07-25 DOI:10.1109/IGARSS.2010.5652955

A. Colliander, K. McDonald, R. Zimmermann, Thomas Linke, R. Schroeder, J. Kimball, E. Njoku

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引用次数: 2

Abstract

The mapping of freeze/thaw state of the landscape is one of the main objectives of NASA's upcoming SMAP (Soil Moisture Active and Passive) mission. This study applies ALECTRA (Alaska Ecological Transect) biophysical network and QuikSCAT scatterometer data to evaluate some of the validation issues regarding the SMAP freeze/thaw measurements. Although the QuikSCAT data is at Ku-band frequency, rather than the L-band of the SMAP instrument, the data is utilized due to its uniquely high temporal resolution over the ALECTRA sites. The results show that multiple temperature measurements representative of individual landscape (soil, snow cover, vegetation and atmosphere) elements and spatial heterogeneity within the satellite field-of-view are important for understanding the radar backscatter process and aggregate freeze/thaw signal. The backscatter temporal dynamics and relative contribution of these landscape elements to the freeze-thaw signal varies with land cover type, seasonal weather and climate conditions.

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2000 - 2007年阿拉斯加ALECTRA站点景观冻融状态的快速后向散射灵敏度:在SMAP验证规划中的应用

绘制冻土/解冻状态的地图是NASA即将实施的SMAP(土壤湿度主动和被动)任务的主要目标之一。本研究应用ALECTRA(阿拉斯加生态样带)生物物理网络和QuikSCAT散射计数据，对SMAP冻融测量的一些验证问题进行了评估。尽管QuikSCAT数据是ku波段频率，而不是SMAP仪器的l波段，但由于其在ALECTRA站点上具有独特的高时间分辨率，因此可以利用QuikSCAT数据。结果表明，在卫星视场范围内，具有代表性的多个景观要素(土壤、积雪、植被和大气)的温度测量值和空间异质性对于理解雷达后向散射过程和总体冻融信号具有重要意义。这些景观要素的后向散射时间动态及其对冻融信号的相对贡献随土地覆盖类型、季节天气和气候条件的变化而变化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 IEEE International Geoscience and Remote Sensing Symposium

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