Detection of snowmelt regions on the Greenland ice sheet using diurnal backscatter change
Detection of snowmelt regions on the Greenland ice sheet using diurnal backscatter change
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DOI：
10.3189/172756501781831738
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发表时间：
2001
影响因子：
3.4
通讯作者：
S. Nghiem;K. Steffen;R. Kwok;W. Tsai
中科院分区：
文献类型：
--
作者：
S. Nghiem;K. Steffen;R. Kwok;W. Tsai
摘要 每天使用 QuikSCAT 卫星上的 SeaWinds 宽幅 Ku 波段 (13.4 GHz) 散射仪绘制格陵兰岛冰雪融化区域的地图。该方法利用 SeaWinds/QuikSCAT 数据的高时间分辨率，使用与绝对校准无关的日反向散射变化来进行熔体测绘。结果揭示了几个明显的融化和再冻结事件，并且地形的影响在融化模式中很明显。空间分辨率足以识别主冰盖以西的 Sukker-toppen Iskappe 的融化特征。 1999 年 9 月下旬，在格陵兰冰盖南部西翼上空检测到一次由暖空气向下混合引起的异常变暖事件。呈现了从夏季到秋季结冰期间融化区域的时间序列图像。卫星观测结果通过格陵兰气候网络站的现场测量进行了验证。
Abstract Snowmelt regions on Greenland ice are mapped daily with the SeaWinds wideswath Ku-band (13.4 GHz) scatterometer on the QuikSCAT satellite. The approach exploits the high temporal resolution of SeaWinds/QuikSCAT data for the melt mapping using diurnal backscatter change independent of the absolute calibration. The results reveal several pronounced melting and refreezing events, and effects of topography are evident in the melt patterns. The spatial resolution is sufficient to identify melt features on the Sukker-toppen Iskappe west of the main ice sheet. An anomalous warming event, caused by down-ward mixing of warm air, is detected in late September 1999 over the west flank of the southern Greenland ice sheet. Time-series images of melt regions are presented over the period from summer to the fall freeze-up. The satellite observations are verified with in situ measurements from the Greenland Climate Network stations.