The asymmetric influence of the positive and negative IOD events on China's rainfall

被引：105

作者：

Qiu, Yun ^{[1
,2
]}

Cai, Wenju ^{[2
]}

Guo, Xiaogang ^{[1
]}

Ng, Benjamin ^{[2
]}

机构：

[1] State Ocean Adm, Inst Oceanog 3, Xiamen, Peoples R China

[2] CSIRO Marine & Atmospher Res, Aspendale, Vic, Australia

来源：

SCIENTIFIC REPORTS | 2014年 / 4卷

关键词：

INDIAN-OCEAN DIPOLE; ASIAN SUMMER MONSOON; EAST-ASIA; ATMOSPHERIC CIRCULATION; SHORT RAINS; IMPACT; MODE; DYNAMICS; PACIFIC;

D O I：

10.1038/srep04943

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Rainfall anomalies over southern China are found to be asymmetricly influenced by the Indian Ocean Dipole (IOD), with a far stronger influence from positive IOD (pIOD) events. A greater convection anomaly and an equivalent-barotropic Rossby wave train response occurs during pIOD events than during negative IOD (nIOD) events. Over the Bay of Bengal (BOB) and South China Sea (SCS), an associated low-level anomalous anticyclone strengthens the southwesterlies during boreal fall (September, October and November, SON), when a pIOD matures. The increased moisture flux gives rise to the anomalously high rainfall over southern China. During its developing phase (boreal summer, June, July, and August, JJA), the influence of a pIOD event on the contemporaneous rainfall over southern China is weak, but a JJA pIOD index is highly correlated with fall rainfall. Therefore, this index can serve as a potential predictor for variations of boreal fall rainfall over southern China.

引用

页数：6

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