Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.atmosres.2021.105489 |
Large-scale atmospheric circulation patterns associated with extreme monsoon precipitation in Pakistan during 1981–2018 | |
Waheed Ullah, Wang Guojie, Dan Lou, Safi Ullah, ... Gohar Ali | |
2021-01-29 | |
发表期刊 | Atmospheric Research
![]() |
出版年 | 2021 |
英文摘要 | Deviations in South Asian Summer Monsoon (SASM) precipitation affect the regional floods and drought patterns. In the current study, in-situ observations from Pakistan Meteorological Department (PMD), remotely sensed precipitation data from Climate Hazard Infrared Precipitation with Station data (CHIRPS), reanalysis data from ERA5, and National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) during 1981–2018 are used to explore the atmospheric circulation patterns during above and below-normal precipitation episodes. In a statistical sense, two methods, namely the Empirical Orthogonal Function (EOF) and Percent Normal (PN) indices are used to derive dominant spatial patterns and temporal evolution of extreme monsoon precipitation episodes. Results inferred 60% of the variance to the leading EOF mode depicting a similar spatial pattern of eigenvectors across the region. The leading principal component (PC) and PN index together depicted similar deviations, complementing the extreme flooding and drought years. From the composites, an anomalous increase (decrease) in seasonal precipitation magnitude was observed. The possible mechanism suggests an active control of atmospheric and sea-surface temperature (SST) forcing by altering the wind ascent (descent). The jet streams (200 hPa) intensification of Rossby waves high (low) pressure provides favorable frontal boundaries between polar cold and tropical warm air masses. The westerlies and easterlies are intensified (suppressed) during the above (below) normal precipitation composites, affecting the moisture transport. The enhanced (reduced) convective activities in the Indian Ocean as a primary source affected precipitation in the region during each composite. |
领域 | 地球科学 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/313596 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | Waheed Ullah, Wang Guojie, Dan Lou, Safi Ullah, ... Gohar Ali. Large-scale atmospheric circulation patterns associated with extreme monsoon precipitation in Pakistan during 1981–2018[J]. Atmospheric Research,2021. |
APA | Waheed Ullah, Wang Guojie, Dan Lou, Safi Ullah, ... Gohar Ali.(2021).Large-scale atmospheric circulation patterns associated with extreme monsoon precipitation in Pakistan during 1981–2018.Atmospheric Research. |
MLA | Waheed Ullah, Wang Guojie, Dan Lou, Safi Ullah, ... Gohar Ali."Large-scale atmospheric circulation patterns associated with extreme monsoon precipitation in Pakistan during 1981–2018".Atmospheric Research (2021). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论