DOI: 10.1029/2018JD028652
Scopus记录号: 2-s2.0-85052813444
论文题名: Disentangling Impacts of Dynamic and Thermodynamic Components on Late Summer Rainfall Anomalies in East Asia
作者: Oh H. ; Ha K.-J. ; Timmermann A.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 16 起始页码: 8623
结束页码: 8633
语种: 英语
英文摘要: This study has examined relative contributions of dynamic and thermodynamic components to East Asian summer monsoon (EASM), compared to the others over Asia. We have decomposed of moisture budget into the dynamic and thermodynamic components composing of interannual variability of the EASM. As represented by the moisture budget, the Asian monsoon is mostly caused by changes in winds (dynamic component); interestingly, changes in moisture (thermodynamic component) play an important role in monsoon rainfall anomalies only for East Asia (27.09%). In terms of the dynamic component over East Asia, strong continental heating, resulting in enhanced land-sea contrast, is identified as crucial to a local development of winds toward East Asia, and it ultimately strengthens a meridional wind, which is accompanied by the western North Pacific subtropical high. In addition, the negative winter North Atlantic Oscillation could induce the enhanced moisture advection term of the dynamic component over East Asia through barotropic Rossby wave propagation. The thermodynamic component has a localized effect on net precipitation at midlatitudes, with an enhanced wave train pattern with a zonal wavenumber-5, which reinforces the Okhotsk high. These distinct large-scale circulation patterns together create favorable conditions for heavy rainfall over East Asia when the two components are positively in-phase. Here we have also described that the extreme heavy rainfall is noticeable when the Eurasian blocking occurs. This study is expected to improve the detailed predictability of the EASM by understanding the two components to prevent disaster risks in terms of extreme rainfall. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113225
Appears in Collections: 气候减缓与适应
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作者单位: Center for Climate Physics, Institute for Basic Science, Busan, South Korea; Department of Atmospheric Sciences, Pusan National University, Busan, South Korea
Recommended Citation:
Oh H.,Ha K.-J.,Timmermann A.. Disentangling Impacts of Dynamic and Thermodynamic Components on Late Summer Rainfall Anomalies in East Asia[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(16)