...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nordic hydrology >Snow-Distribution Modelling in the Ammassalik Region, South East Greenland
【24h】

Snow-Distribution Modelling in the Ammassalik Region, South East Greenland

机译：格陵兰东南部Ammassalik地区的积雪分布模型

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Ammassalik region is characterized by a strong alpine relief, with altitudes up to 1,000 m. Glaciers are located mainly on the western side of ridges. The climate is low arctic, with annual precipitation amounts of more than 1,000 mm, which falls mainly as snow. Furthermore very strong storms occur frequently throughout the region. All together these factors support strong snow redistribution by wind, which likely explains the glacier locations, and also explains the observed regional runoff differences. The aim of this study is to apply the Liston & Sturm snow-transport model (SnowTran-3D) to elucidate the snow distribution according to the actual climatic conditions. A digital terrain model was used to determine the terrain forcing of the wind field. Precipitation data from the Ammassalik meteorological station were corrected for aerodynamic errors and orographic effects. Wind, temperature and humidity were obtained from a station located on a nunatak 515 m.a.s.l. at the equilibrium line on the Mittivakkat Glacier. The recorded winter accumulation (balance) of snow on the glacier was used for model calibration and testing. Significant snow transport from east-facing slopes to west-facing slopes was confirmed by the model. The drift accumulations were greatest at the head of the glacier, just on the lee side of the ridge east of the glacier. In some areas, as much as 10% of the precipitation was returned to the atmosphere by blowing-snow sublimation. An average snow water equivalent of 113 cm was obtained (not including some minor areas having snow depths as great as 4 m). These results compare well with glacier observations of 114 cm collected in May 1998 (during the field survey the 4 m areas are omitted because of crevasse hazards). Future work will use the model to test scenarios that include changes in wind regime.
机译：阿玛萨里克（Ammassalik）地区的特征是强烈的高山起伏，海拔高达1000 m。冰川主要位于山脊的西侧。北极地区气候低，年降水量超过1000毫米，主要以降雪为主。此外，整个地区频繁发生强风暴。所有这些因素共同支持风大雪的重新分布，这很可能解释了冰川的位置，也解释了观测到的区域径流差异。这项研究的目的是应用Liston＆Sturm积雪运输模型（SnowTran-3D）根据实际气候条件阐明积雪分布。使用数字地形模型来确定风场的地形强迫。来自Ammassalik气象站的降水数据已针对空气动力学误差和地形影响进行了校正。风，温度和湿度是从位于nunatak 515 m.a.s.l.上的站点获得的。在Mittivakkat冰川的平衡线上。记录的冬季积雪在冰川上的积雪（平衡）用于模型校准和测试。该模型证实了从东坡到西坡的大量积雪运输。在冰川的顶部，正好在冰川以东的山脊的背风侧，漂移的堆积最大。在某些地区，通过吹雪升华将多达10％的降水返回到大气中。平均雪水量为113厘米（不包括雪深达4 m的一些小区域）。这些结果与1998年5月收集的114厘米冰川观测结果相吻合（在实地调查中，由于裂隙危险，省略了4 m区域）。未来的工作将使用该模型来测试包括风况变化的场景。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号