Temporal and Spatial Aspects of Snow Distribution in the Nam Co Basin on the Tibetan Plateau from MODIS Data
Temporal and Spatial Aspects of Snow Distribution in the Nam Co Basin on the Tibetan Plateau from MODIS Data
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MODIS数据显示青藏高原纳木错盆地积雪分布时空特征
DOI：
10.3390/rs2122700
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发表时间：
2010-12
期刊：
影响因子：
5
通讯作者：
Chen Feng
中科院分区：
文献类型：
--
作者：
Jan Kropacek;Chen Feng
青藏高原大部分地区只有稀疏的地面积雪采样站网络覆盖，而由于风、地形等原因，积雪分布高度不均匀，但积雪和空间格局在水文循环中起着重要作用。它在季风季开始前的干燥春季期间释放水分。自2002年以来，广泛使用的MODIS雪盖产品已在全球范围内推出。要了解某一区域积雪的时空分布，就需要一种全面的数据表示方法。本文提出了一种从MODIS 8日合成数据中可视化积雪分布的时空特征的方法。它是基于按季节分组的雪盖数据的RGB显示。对2002-2009年青藏高原中部纳木错盆地的积雪分布进行了RGB合成。在盆地西部发现了季风和秋季积雪的交替模式，这与印度季风变化的两年期特征相对应。在2002、2004和2008年的RSD图像中发现了季风积雪，而在2003和2009年则以秋季积雪为主。盆地的东部并不遵循这种一般模式，因为它受到所谓的“湖效应”的影响，所谓的“湖效应”是指在冬季的几个月里，干燥和寒冷的西风带经过湖面而导致的降雪。从RSD图像中可以看出，2002年、2006年和2007年是湖泊效应特别强烈的年份。有永久积雪的地区和没有降雪的地区都被发现相对稳定。将纳木错与附近的思陵湖效应进行了比较，认为湖效应较小或不存在时，湖对岸存在有效屏障是发生强湖效应的前提条件。
Large areas of the Tibetan plateau are only covered by a sparse network of ground snow sampling stations, while the snow cover is highly heterogeneously distributed due to wind, topography etc. Nevertheless, the snow accumulation and spatial patterns play an important role in the hydrological cycle. It releases moisture during the dry spring period before the onset of the monsoon season. Widely used MODIS snow cover products have been available globally since 2002. The understanding of the temporal and spatial distribution of snow cover in a given region calls for a comprehensive data representation method. In this paper a method to visualize both spatial and temporal aspects of snow cover distribution from MODIS 8-day composite data is presented. It is based on RGB display of the snow cover data which is grouped according to season. The RGB syntheses of snow cover distribution (RSD) were generated for the Nam Co Basin in the central part of the Tibetan Plateau during the years of 2002–2009. An alternating pattern of monsoon and autumn snow cover was identified in the western part of the basin which corresponds to the biennial character of the variations of the Indian monsoon. Monsoon snow cover was found in RSD images for the years 2002, 2004 and 2008 whereas in years 2003 and 2009 the autumn snow cover is dominant. The eastern part of the basin does not follow this general pattern since it is affected by the so called “lake effect”, which is a snow fall induced by the passing of dry and cold westerlies over the lake surface during the winter months. The years 2002, 2006 and 2007 were identified as years with a particularly strong lake effect from the RSD images. Areas with permanent snow cover and areas that were snow free were both found to be relatively stable. Comparison of the lake effect at Nam Co with nearby Siling Co, where the lake effect is smaller or absent, suggests that the presence of an effective barrier on the opposite side of the lake is a prerequisite for the occurrence of the strong lake effect.
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DOI：
10.1117/12.836457
发表时间：
2009-06
期刊：
--
影响因子：
--
作者：
Lina Xu;R. Niu;Yan-nan Zhao;Jiong Li;Ting Wu
通讯作者：
Lina Xu;R. Niu;Yan-nan Zhao;Jiong Li;Ting Wu
影响因子：
3.1
作者：
S. Tian;T. Yasunari
通讯作者：
S. Tian;T. Yasunari
影响因子：
2.5
作者：
Zhang Qiang-gong
通讯作者：
Zhang Qiang-gong
影响因子：
5.8
作者：
L. Guoping;Lu Jinghua;Jin Bingling;Bu Nima
通讯作者：
L. Guoping;Lu Jinghua;Jin Bingling;Bu Nima
DOI：
10.1029/eo068i004p00051
发表时间：
1987-01
期刊：
Eos, Transactions American Geophysical Union
影响因子：
--
作者：
K. Jezek
通讯作者：
K. Jezek