Airborne 6GHz passive microwave observation of winter ground conditions in Alaska

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  • 航空機搭載6GHzマイクロ波放射計による冬季アラスカの地表面状態の観測
  • コウクウキ トウサイ 6GHz マイクロハ ホウシャケイ ニ ヨル トウキ アラスカ ノ チヒョウメン ジョウタイ ノ カンソク

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Abstract

The Arctic region has been experiencing rapid climate change and this hasin fluenced the cryosphere. At high latitudes, observation of the cryosphere is possible using microwave observation, as microwave observation doesno t require solar radiation and isals o possible under cloud cover conditions. Satellite-based microwave observation has been offering important climatological data. The wide microwave radiometer observation pixelscon tain variousland types, such ass now and ice with forest, frozen lakesand wetland, and mountain slopes. It is necessary to study the freezing conditionso f ground that liesunder snow-cover, aswell ass now propertiesand structures. Although many previouss tudies have used 37 GHz and 19 GHz for snow observation, thiss tudy evaluates the utilization of a lower microwave frequency (6 GHz), which has the advantage of greater depth of penetration into snow or snowcovered ground. Airborne microwave observation in Alaska was carried out in thiss tudy. The observed data showss ignificant drops of microwave emission at the frozen lake, and increases in the dense forest area. Although surface temperature waslow on the mountain snow slope, microwave emission was not reduced. These observationsare indicative of subsurface temperature conditions. Thiss tudy discusses the possible use of microwave data, especially of lower frequency, for snow-covered high latitude regions.

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