Cryosphere applications of NSCAT data
Cryosphere applications of NSCAT data
复制标题
NSCAT 数据的冰冻圈应用
DOI：
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发表时间：
1999
影响因子：
8.2
通讯作者：
M. Drinkwater
中科院分区：
文献类型：
--
作者：
D. Long;M. Drinkwater
虽然设计用于测量海洋上空的矢量风，但新的成像技术有助于在冰冻圈研究中使用美国航天局散射计数据。NSCAT提供了前所未有的覆盖范围，分辨率和质量的数据，再加上散射仪图像重建与滤波（SIRF）算法，使图像的/spl sigma//supo/在分辨率接近8公里的静止目标。这种图像在冰测绘和分类方面很有用，通过与海洋卫星散射计（SASS）数据进行比较，可以进行多年研究。通过审查NSCAT数据的两项冰冻圈应用，说明了NSCAT数据在极地冰研究中的效用：（1）海冰测绘和跟踪;（2）格陵兰和南极冰盖变化。由于扫描带宽、重访频繁，加上入射角和方位角的多样性，NSCAT数据在绘制海冰范围图方面非常有效。在格陵兰岛，雪和冰的“相”的季节性依赖的雷达后向散射截面的基础上，明确划定，由于雷达后向散射的成岩作用的变化发生在表面和下面的敏感性。通过比较《国家气候变化调查表》和《格陵兰社会科学调查表》的数据，可以研究1978年至1996年格陵兰的变化。
Though designed to measure vector winds over the ocean, new imaging techniques facilitate the use of NASA scatterometer data (NSCAT) in cryosphere studies. NSCAT provides data of unprecedented coverage, resolution, and quality which, when coupled with the scatterometer image reconstruction with filtering (SIRF) algorithm, enables images of /spl sigma//sup o/ at resolutions approaching 8 km over stationary targets. Such images are useful in ice mapping and classification, and multidecadal studies are possible by comparison with Seasat Scatterometer (SASS) data. The utility of NSCAT data in polar ice studies is illustrated through a review of two cryosphere applications of NSCAT data: (1) sea-ice mapping and tracking and (2) ice-sheet change in Greenland and Antarctica. The wide swath and frequent revisit, coupled with incidence and azimuth angle diversity makes NSCAT data very effective in mapping the extent of sea-ice. In Greenland, snow and ice "facies" are clearly delineated on the basis of the seasonally dependent radar backscattering cross section, due to sensitivity of radar backscatter to diagenetic changes occurring at and beneath the surface. Comparison of NSCAT and SASS data enables study of change in Greenland between 1978 and 1996.