The interaction of Indian monsoon depressions with northwesterly midlevel dry intrusions
The interaction of Indian monsoon depressions with northwesterly midlevel dry intrusions
复制标题
印度季风洼地与西北中层干燥入侵的相互作用
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
M. Govindankutty
中科院分区：
文献类型：
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作者：
J. Fletcher;D. Parker;Kieran M. R. Hunt;G. Vishwanathan;M. Govindankutty
摘要季风低压给印度北方和中部带来了大量的季风降水。这些事件通常在孟加拉湾上空形成，并穿过印度北方向巴基斯坦传播。使用欧洲中期天气预报中心中期再分析，MD跟踪算法，和一个客观的识别方法，作者发现，约40%的MD与干燥的沙漠气团的北入侵的MD横穿次大陆。MD与干入侵的相互作用之前，往往是正的位涡（PV）异常的副热带急流和低层反气旋异常在北阿拉伯海。干燥的侵入物几乎使MD西南象限的降水率减半，MD降雨量最大。然而，干侵入增加MD中心附近的降雨率。同样，上升在MD中心以西减小，在MD中心增强，特别是在对流层上部。MD中心以西上升的减少可能是由于…
AbstractMonsoon depressions (MDs) bring substantial monsoon rainfall to northern and central India. These events usually form over the Bay of Bengal and travel across northern India toward Pakistan. Using European Centre for Medium-Range Weather Forecasts interim reanalysis, an MD-tracking algorithm, and an objective identification method, the authors find that about 40% of MDs interact with northerly intrusions of dry desert air masses as the MDs traverse the subcontinent. MD interactions with dry intrusions are often preceded by positive potential vorticity (PV) anomalies on the subtropical jet and low-level anticyclonic anomalies over the north Arabian Sea. Dry intrusions nearly halve the precipitation rate in the southwest quadrant of MDs, where MDs rain the most. However, dry intrusions increase the rainfall rate near the MD center. Similarly, ascent is reduced west of the MD center and enhanced at the MD center, especially in the upper troposphere. The reduced ascent west of MD centers is likely att...
影响因子：
8.9
作者：
Hunt, Kieran M. R.;Parker, Douglas J.
通讯作者：
Parker, Douglas J.