Role of the South China Sea in Southern China rainfall: meridional moisture flux transport

Li Xiangting; Wang Chunzai; Lan Jian

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Role of the South China Sea in Southern China rainfall: meridional moisture flux transport

机译：南海在中国南方的角色降雨：经济湿润助焊剂运输

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The South China Sea (SCS) serves as the main source of moisture for rainfall in Southern China (SC) and the meridional moisture transport to SC is dominated by wind changes during the first rainy season (April-June). El Nino-Southern Oscillation (ENSO) and Tropical Northwestern Pacific (TNWP) variability modulate the SC rainfall through anomalous anticyclonic circulation over the western North Pacific by strengthening the SCS meridional moisture transport to SC. However, our study indicates that the SCS is not only the intermediary in which ENSO or the TNWP affects the SC rainfall but also plays an independent role in the modulation of the SC rainfall. Notably, the SCS meridional moisture transport has a lower impact on the SC rainfall during the second rainy season (July-September), especially in July. At that time, the main cause of the SC rainfall is the southward moisture flux anomaly across its northern boundary with the anomalous cyclone over SC. This cyclone suppresses the moisture flux out of SC and leads to moisture convergence in SC. Moreover, we present a new concept by analyzing internal differences of moisture circulation during the second rainy season. Either strengthening the meridional moisture flux into SC across its southern boundary or suppressing the moisture flux out of SC across its northern boundary is important depending on whether or not the moisture from the SCS can converge in SC, which is mainly determined by the amplitude of moisture transport fluxes in SC.

机译：南海（SCS）作为中国南部（SC）降雨量的主要水分来源，对SC的经济水分运输是在第一个雨季（4月至6月）的风变化的主导。 El Nino-Southern振荡（ENSO）和热带西北太平洋（TNWP）可变性通过加强SCS使湿润的水分运输到SC，通过对西北太平洋的异常反转循环调节SC降雨。然而，我们的研究表明，南海不仅在ENSO或TNWP影响SC降雨中介而且对在SC降雨调制的独立作用。值得注意的是，SCS的经济水分运输对第二个雨季（九月至9月）期间对SC降雨的影响较低，特别是在7月。那时，SC降雨的主要原因是朝南水分助殖助剂异常，其北部边界与sc上的异常旋风。该旋风抑制了SC的水分助焊剂，并导致SC中的水分收敛。此外，我们通过分析第二个雨季期间水分循环的内部差异来提出新的概念。根据其北方边界的南部边界或抑制SC中的水分通量的增强，无论是在其北方边界的情况下都很重要，这取决于来自SCs的水分是否可以在SC中收敛，这主要由水分幅度决定SC中的运输通量。

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来源
《Climate dynamics》 |2021年第8期|2551-2568|共18页
作者
Li Xiangting; Wang Chunzai; Lan Jian;
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作者单位

Ocean Univ China Coll Ocean & Atmospher Sci Qingdao Peoples R China|Ocean Univ China Inst Adv Ocean Study Phys Oceanog Lab Qingdao Peoples R China;

Chinese Acad Sci South China Sea Inst Oceanol State Key Lab Trop Oceanog Guangzhou 510301 Peoples R China|Southern Marine Sci & Engn Guangdong Lab Guangzho Guangzhou 511458 Peoples R China|Chinese Acad Sci Innovat Acad South China Sea Ecol & Environm Engn Guangzhou Peoples R China;

Ocean Univ China Coll Ocean & Atmospher Sci Qingdao Peoples R China|Ocean Univ China Inst Adv Ocean Study Phys Oceanog Lab Qingdao Peoples R China;

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正文语种 eng
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关键词
South China Sea; Meridional moisture flux; Southern china rainfall; Rainy season;

机译：南海;经络水分助焊剂;中国南方降雨;雨季;

Role of the South China Sea in Southern China rainfall: meridional moisture flux transport

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