The 2010 Pakistan Flood and Russian Heat Wave: Teleconnection of Hydrometeorological Extremes
The 2010 Pakistan Flood and Russian Heat Wave: Teleconnection of Hydrometeorological Extremes
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DOI：
10.1175/jhm-d-11-016.1
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发表时间：
2012-02-01
影响因子：
3.8
通讯作者：
Kim, Kyu-Myong
中科院分区：
文献类型：
--
作者：
Lau, William K. M.;Kim, Kyu-Myong
本文的初步结果表明，2010年夏季俄罗斯热浪野火和巴基斯坦洪水这两个创纪录的极端事件具有物理上的联系。研究发现，俄罗斯热浪与一个异常强烈和持久的温带大气阻塞事件的发展有关，该事件与跨越俄罗斯西部的大尺度大气罗斯比波列的激发有关。罗斯比波前槽的高层涡度扰动向南渗透，有助于引发7月中下旬巴基斯坦北部及附近地区的异常暴雨事件。还有证据表明，俄罗斯热浪通过大气阻塞模式与土壤湿度低于正常水平的广阔陆地区域之间的地表能量通量变化的正反馈而被放大。沿喜马拉雅山麓的强烈距平东南气流和来自孟加拉湾的丰富水汽输送与季风季内振荡向北传播有关，放大和维持了巴基斯坦的暴雨事件。
In this paper, preliminary results are presented showing that the two record-setting extreme events during 2010 summer (i.e., the Russian heat wave-wildfires and Pakistan flood) were physically connected. It is found that the Russian heat wave was associated with the development of an extraordinarily strong and prolonged extratropical atmospheric blocking event in association with the excitation of a large-scale atmospheric Rossby wave train spanning western Russia. Kazakhstan, and the northwestern China Tibetan Plateau region. The southward penetration of upper-level vorticity perturbations in the leading trough of the Rossby wave was instrumental in triggering anomalously heavy rain events over northern Pakistan and vicinity in mid- to late July. Also shown are evidences that the Russian heat wave was amplified by a positive feedback through changes in surface energy fluxes between the atmospheric blocking pattern and an underlying extensive land region with below-normal soil moisture. The Pakistan heavy rain events were amplified and sustained by strong anomalous southeasterly flow along the Himalayan foothills and abundant moisture transport from the Bay of Bengal in connection with the northward propagation of the monsoonal intraseasonal oscillation.