The classification of Arctic sea ice types and the determination of surface temperature using advanced very high resolution radiometer data
The classification of Arctic sea ice types and the determination of surface temperature using advanced very high resolution radiometer data
复制标题
使用先进的极高分辨率辐射计数据对北极海冰类型进行分类并确定表面温度
DOI：
10.1029/93jc03449
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发表时间：
1994
影响因子：
--
通讯作者：
J. Comiso
中科院分区：
文献类型：
--
作者：
R. Massom;J. Comiso
新的冰和开放水域面积和海冰包内的表面温度的准确量化是在极地地区的海洋和大气之间的热量，水分和湍流通量的现实参数化的关键。分析了NOAA高级甚高分辨率辐射计/2（AVHRR/2）卫星多光谱图像，以评估如何有效地利用这些数据来描述白令海和格陵兰海海冰的表面类型和物理温度。分类算法的基础上，这是使用晚冬白令海冰盖数据开发的，是10.8微米辐射的频率分布提供了四个不同的峰值，代表开放水域，新冰，年轻的冰，厚冰与积雪。结果被发现是空间和时间上一致的。可能的来源的模糊性，特别是与更广泛的时间和空间应用的技术，进行了讨论。冰表面温度的算法是开发相同的研究领域回归热红外数据从10.8和12.0微米的通道对站的空气温度，这是假设近似的皮肤温度相邻的雪和冰。与现场数据相比，结果的标准偏差约为0.5 K以上的铅和polynyas约0.5 - 1.5 K以上的厚冰。这项研究是基于一套范围和覆盖面有限的现场数据。使用阈值技术，利用3.74和10.8微米的通道数据的云掩模。制作的温度图显示出与新冰和铅等表面特征的一致性，以及与相应表面类型图的一致性。需要进一步的研究，以更好地了解发射率，气溶胶和可降水的大气冰粒分布，以及大气温度逆温的空间和时间变化的影响。
The accurate quantification of new ice and open water areas and surface temperatures within the sea ice packs is a key to the realistic parameterization of heat, moisture, and turbulence fluxes between ocean and atmosphere in the polar regions. Multispectral NOAA advanced very high resolution radiometer/2 (AVHRR/2) satellite images are analyzed to evaluate how effectively the data can be used to characterize sea ice in the Bering and Greenland seas, both in terms of surface type and physical temperature. The basis of the classification algorithm, which is developed using a late wintertime Bering Sea ice cover data, is that frequency distributions of 10.8- micrometers radiances provide four distinct peaks, represeting open water, new ice, young ice, and thick ice with a snow cover. The results are found to be spatially and temporally consistent. Possible sources of ambiguity, especially associated with wider temporal and spatial application of the technique, are discussed. An ice surface temperature algorithm is developed for the same study area by regressing thermal infrared data from 10.8- and 12.0- micrometers channels against station air temperatures, which are assumed to approximate the skin temperatures of adjacent snow and ice. The standard deviations of the results when compared with in situ data are about 0.5 K over leads and polynyas to about 0.5-1.5 K over thick ice. This study is based upon a set of in situ data limited in scope and coverage. Cloud masks are applied using a thresholding technique that utilizes 3.74- and 10.8- micrometers channel data. The temperature maps produced show coherence with surface features like new ice and leads, and consistency with corresponding surface type maps. Further studies are needed to better understand the effects of both the spatial and temporal variability in emissivity, aerosol and precipitable atmospheric ice particle distribution, and atmospheric temperature inversions.
影响因子：
3.6
作者：
MCCLAIN, EP;PICHEL, WG;WALTON, CC
通讯作者：
WALTON, CC