| 1988～1998年北半球积雪时空变化特征分析 |
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| 引用本文： | 杨修群,张琳娜.1988～1998年北半球积雪时空变化特征分析[J].大气科学,2001,25(6):757-766. |
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| 作者姓名： | 杨修群 张琳娜 |
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| 作者单位： | 南京大学大气科学系,南京 210093 |
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| 基金项目： | 国家重点基础研究发展规划项目G1998040900第一部分资助 |
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| 摘 要： | 利用NOAA提供的北半球近10年(1988～1998)逐周雪盖观测资料，通过引入年或季节累积雪盖周数作为对雪量累积情况的定量衡量，对北半球雪盖变化时空特征进行了分析。结果表明:近10年来，北半球积雪年际变化的关键区位于青藏高原、蒙古高原、欧洲阿尔卑斯山脉及北美中西部，其中青藏高原是北半球积雪异常变化最强烈的区域。青藏高原和欧亚大陆其他地区积雪变化的关联表现为两种不同的时空变化型，第一种型表现为青藏高原地区和其他地区(如欧洲、俄罗斯远东地区)积雪的同位相趋势性增多；第二种型表现为青藏高原地区和中亚地区积雪变化同位相，而和蒙古高原－我国东北地区积雪变化反位相的年际振荡。
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| 关 键 词： | 积雪 北半球 青藏高原 |
An Investigation of Temporal and Spatial Variations of 1988～ 1998 Snow Cover over the Northern Hemisphere |
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| Yang Xiuqun and Zhang Linna.An Investigation of Temporal and Spatial Variations of 1988～ 1998 Snow Cover over the Northern Hemisphere[J].Chinese Journal of Atmospheric Sciences,2001,25(6):757-766. |
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| Authors: | Yang Xiuqun and Zhang Linna |
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| Abstract: | A NOAA satellite-derived dataset of the weekly snow cover for 1988- 1998 was used in this study to describe its temporal and spatial variations. A counted number of the weeks (CNW) with snow cover at each grid point is defined for a year or a season to quantitatively measure accumulation of the snow cover. Detailed analysis based on the computed 10-year CNW data shows a remarkable interannual variation for the snow cover over the Northern Hemisphere during last decade. Key areas for the interannual variation are located in the Tibetan Plateau, the Mongolian Plateau, the Alps and central and western regions of North America, and the Tibetan Plateau is the most important region with the largest interannual variability in CNW. There are two patterns relating the variation of snow cover over the Tibetan Plateau to that of other regions. One is the in-phase pattern between the Tibetan Plateau and other regions (say, Europe, and far eastern region of Russia), and this pattern has an obvious ascending trend over last decade, indicating a continuous increase of snow cover over the Tibetan Plateau since 1988. The other pattern is characterized by an out-of-phase relation between over the Tibetan Plateau and over Europe, the Mongolian Plateau, North-eastern China, but by an in-phase relation between over the Tibetan Plateau and over the central Asia, and this pattern has a certain kind of interannual oscillation. |
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| Keywords: | snow cover variations Northern Hemisphere Tibetan Plateau |
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