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首页> 外文会议>Geoscience and Remote Sensing Symposium Proceedings, 1998. IGARSS '98. 1998 IEEE International >Interannual variability of Antarctic snow melt events derived from scatterometer data
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Interannual variability of Antarctic snow melt events derived from scatterometer data

机译：散射仪数据推导的南极融雪事件的年际变化

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Microwave backscatter from the Antarctic snow cover depends on the surface roughness, properties and structure within the snow cover, and moisture content. Small increases in moisture content produce a significant reduction in backscatter. This acts as a sensitive indicator of the occurrence of snow melt conditions. The ERS wind scatterometers provide an almost continuous sequence of observations of microwave backscatter coefficients over Antarctica north of latitude 79/spl deg/S since August 1991. Normalised values of the backscatter coefficient are calculated by removing the anisotropic contributions, mainly from a dependence on incidence angle. Depression of these values below a long term dry snow average indicates occurrence of snow melt. The results show a large variability between summer seasons of melt extent and duration. There was very extensive and intense melting in 1991-92, with much less melt in following seasons probably in response to a cooling following the Pinatubo eruption. 1997-98 has extensive melt with a total area approaching that for 1991-92.
机译：来自南极积雪的微波反向散射取决于积雪的表面粗糙度，性质和结构以及水分含量。水分含量的少量增加会大大减少反向散射。这是雪融化情况发生的敏感指示。自1991年8月以来，ERS风散射仪几乎连续地观测了南极北纬79 / spl deg / S上的微波后向散射系数。通过消除各向异性的贡献来计算后向散射系数的归一化值，这主要是由于对入射的依赖性角度。如果将这些值降低到长期干雪平均值以下，则表明发生了融雪。结果表明，夏季融化程度和持续时间之间存在很大差异。 1991-92年间发生了非常广泛和强烈的融化，随后几个季节的融化较少，可能是由于皮纳图博火山喷发后的降温所致。 1997-98年融化广泛，总面积接近1991-92年。

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