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| DOI | 10.1175/JCLI-D-19-0210.1 |
| Diurnal cycle of the Asian summer monsoon: Air pump of the second kind | |
| Chen G. | |
| 发表日期 | 2020 |
| ISSN | 0894-8755 |
| 起始页码 | 1747 |
| 结束页码 | 1775 |
| 卷号 | 33期号:5 |
| 英文摘要 | Diurnal variations of rainfall and winds are pronounced over the Asian summer monsoon region, but their activities under different monsoon conditions are not clarified. Here, the diurnal cycle of monsoon flow and its influence are examined using 20-yr satellite rainfall and reanalysis data. A total of 1840 summer days are partitioned into four dynamic groups of strong or weak background flows with large or small diurnal amplitudes of low-level meridional wind. Large-scale southerly wind is found to be strongest after midnight, with a large diurnal amplitude on strong monsoon days over central-north India and southeast China. Such a nocturnal speed-up is closely associated with the Blackadar boundary layer inertial oscillation due to the diurnal heating over low-lying landmass. It acts like a large air pump that injects moisture poleward at night and strengthens monsoonal circulation with anomalous rising motion at the northern rainband of the Asian monsoon. In particular, monsoon southerlies with large nighttime speed-up converge with downslope winds from the Himalayas or northerly anomaly from midlatitudes. Enhanced water vapor convergence facilitates the growth of organized convection, producing substantial rainfall at the Himalayan foothills in predawn hours and at the mei-yu–baiu zone from predawn to noon. When monsoon flow undergoes a small diurnal cycle, rainfall is instead displaced south and mostly recorded in daytime. Both the daily mean and morning peak of rainfall are suppressed on land under weak monsoon southerlies. Moreover, the monsoon diurnal cycle exhibits evident intraseasonal/interannual variations and contributes to rainfall variability. The results highlight that monsoon flow couples with subdaily forcings to strongly regulate the detailed patterns of rainfall and moisture budget over the Asian monsoon regions. © 2020 American Meteorological Society. |
| 英文关键词 | Boundary layers; Budget control; Moisture; Rain; Asian summer monsoons; Background flow; Diurnal variation; Inertial oscillation; Meridional winds; Monsoon conditions; Rainfall variability; Satellite rainfalls; Atmospheric thermodynamics; annual variation; diurnal variation; monsoon; rainfall; seasonal variation; summer; China; India |
| 语种 | 英语 |
| 来源期刊 | Journal of Climate
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/171414 |
| 作者单位 | School of Atmospheric Sciences, Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-Sen University, Guangzhou, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China |
| 推荐引用方式 GB/T 7714 | Chen G.. Diurnal cycle of the Asian summer monsoon: Air pump of the second kind[J],2020,33(5). |
| APA | Chen G..(2020).Diurnal cycle of the Asian summer monsoon: Air pump of the second kind.Journal of Climate,33(5). |
| MLA | Chen G.."Diurnal cycle of the Asian summer monsoon: Air pump of the second kind".Journal of Climate 33.5(2020). |
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