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DOI | 10.1175/JCLI-D-16-0360.1 |
Effects of the South Asian Monsoon Intraseasonal Modes on Genesis of Low Pressure Systems over Bangladesh | |
Hatsuzuka, Daisuke1,3; Fujinami, Hatsuki2 | |
2017-04-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2017 |
卷号 | 30期号:7 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | The quasi-biweekly oscillation (QBW) is a dominant intraseasonal mode in summer rainfall over Bangladesh. Active phases of the QBW are often accompanied by low pressure systems (LPSs) such as vortex-type lows. This study investigated the effects of two intraseasonal modes, the QBW and the boreal summer intraseasonal oscillation (BSISO), on the genesis of LPSs over Bangladesh during 29 summer monsoon seasons. Daily lag composites of convection and low-level atmospheric circulation were constructed for active-phase cases with LPSs (LPS case) and without LPSs (non-LPS case) based on rainfall in the QBW over Bangladesh. In the QBW mode, a westward propagation of an anticyclonic anomaly from the western Pacific to the Bay of Bengal (BoB) is common in both cases. However, the anticyclonic center in the LPS case is located slightly to the east of that in the non-LPS case, which results in stronger cyclonic vorticity over and around Bangladesh. In contrast, the BSISO mode shows an opposite phase between the two cases: a cyclonic (anticyclonic) anomaly propagating northward from the equator to the BoB in the LPS case (non-LPS case). In the LPS case, the cyclonic anomaly in the BSISO mode enhances the westerly (easterly) flow over the BoB (Bangladesh) in the active phase, resulting in the enhancement of cyclonic vorticity over the northern BoB and Bangladesh, in cooperation with the QBW mode. These results suggest that both the QBW and BSISO modes have significant influence on the environmental conditions for LPS genesis over Bangladesh. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000399678400011 |
WOS关键词 | BAROTROPIC-BAROCLINIC INSTABILITY ; GRIDDED PRECIPITATION DATASET ; BOREAL SUMMER ; INTERANNUAL VARIABILITY ; COMPOSITE STRUCTURE ; INDIAN MONSOON ; DENSE NETWORK ; RAIN GAUGES ; OSCILLATION ; DEPRESSIONS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/19650 |
专题 | 气候变化 |
作者单位 | 1.Nagoya Univ, Grad Sch Environm Studies, Nagoya, Aichi, Japan; 2.Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan; 3.Hokkaido Univ, Fac Environm Earth Sci, Sapporo, Hokkaido, Japan |
推荐引用方式 GB/T 7714 | Hatsuzuka, Daisuke,Fujinami, Hatsuki. Effects of the South Asian Monsoon Intraseasonal Modes on Genesis of Low Pressure Systems over Bangladesh[J]. JOURNAL OF CLIMATE,2017,30(7). |
APA | Hatsuzuka, Daisuke,&Fujinami, Hatsuki.(2017).Effects of the South Asian Monsoon Intraseasonal Modes on Genesis of Low Pressure Systems over Bangladesh.JOURNAL OF CLIMATE,30(7). |
MLA | Hatsuzuka, Daisuke,et al."Effects of the South Asian Monsoon Intraseasonal Modes on Genesis of Low Pressure Systems over Bangladesh".JOURNAL OF CLIMATE 30.7(2017). |
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