The impact of resolution on the representation of southeast Greenland barrier winds and katabatic flows
The impact of resolution on the representation of southeast Greenland barrier winds and katabatic flows
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DOI：
10.1002/2015gl063550
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发表时间：
2015-04-28
影响因子：
5.2
通讯作者：
Mernild, S. H.
中科院分区：
文献类型：
--
作者：
Moore, G. W. K.;Renfrew, I. A.;Mernild, S. H.
南格陵兰岛的特点是许多低层高风速天气系统，这是地形流扭曲的结果。这些系统包括沿东南海岸出现的障碍风和垂直气流。全球大气再分析已被证明是进一步了解这些地形风及其在气候系统中的作用的重要工具。然而，有证据表明，这些系统的中尺度特征可能在这些全球产品中被遗漏。在这里，我们表明，北极系统再分析，一个更高分辨率的区域再分析，能够捕捉到在ERA-I，一个领先的现代全球再分析中遗漏或代表性不足的障碍风和斜降流的中尺度特征。这表明，我们对这些风系统对耦合气候系统的影响的理解可以通过使用更高分辨率的区域再分析或模式数据来增强。
Southern Greenland is characterized by a number of low-level high wind speed weather systems that are the result of topographic flow distortion. These systems include barrier winds and katabatic flow that occur along its southeast coast. Global atmospheric reanalyses have proven to be important tools in furthering our understanding of these orographic winds and their role in the climate system. However, there is evidence that the mesoscale characteristics of these systems may be missed in these global products. Here we show that the Arctic System Reanalysis, a higher-resolution regional reanalysis, is able to capture mesoscale features of barrier winds and katabatic flow that are missed or underrepresented in ERA-I, a leading modern global reanalysis. This suggests that our understanding of the impact of these wind systems on the coupled-climate system can be enhanced through the use of higher-resolution regional reanalyses or model data.