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

被引：96
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
收藏
页数：6
相关论文
共 33 条
  • [1] Influence of the Indian Ocean Dipole on the Australian winter rainfall
    Ashok, K
    Guan, ZY
    Yamagata, T
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2003, 30 (15) : CLM6 - 1
  • [2] Impact of the Indian Ocean Dipole on the relationship between the Indian monsoon rainfall and ENSO
    Ashok, K
    Guan, ZY
    Yamagata, T
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2001, 28 (23) : 4499 - 4502
  • [3] Paramount impact of the Indian Ocean dipole on the East African short rains: A CGCM study
    Behera, SK
    Luo, JJ
    Masson, S
    Delecluse, P
    Gualdi, S
    Navarra, A
    Yamagata, T
    [J]. JOURNAL OF CLIMATE, 2005, 18 (21) : 4514 - 4530
  • [4] Black E, 2003, MON WEATHER REV, V131, P74, DOI 10.1175/1520-0493(2003)131<0074:AOSOTR>2.0.CO
  • [5] 2
  • [6] Climate change contributes to more frequent consecutive positive Indian Ocean Dipole events
    Cai, W.
    Sullivan, A.
    Cowan, T.
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2009, 36
  • [7] An Observation-Based Assessment of Nonlinear Feedback Processes Associated with the Indian Ocean Dipole
    Cai, Wenju
    Qiu, Yun
    [J]. JOURNAL OF CLIMATE, 2013, 26 (09) : 2880 - 2890
  • [8] An Asymmetry in the IOD and ENSO Teleconnection Pathway and Its Impact on Australian Climate
    Cai, Wenju
    van Rensch, Peter
    Cowan, Tim
    Hendon, Harry H.
    [J]. JOURNAL OF CLIMATE, 2012, 25 (18) : 6318 - 6329
  • [9] Teleconnection Pathways of ENSO and the IOD and the Mechanisms for Impacts on Australian Rainfall
    Cai, Wenju
    van Rensch, Peter
    Cowan, Tim
    Hendon, Harry H.
    [J]. JOURNAL OF CLIMATE, 2011, 24 (15) : 3910 - 3923
  • [10] Indian Ocean Dipole influence on South American rainfall
    Chan, Steven C.
    Behera, Swadhin K.
    Yamagata, Toshio
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2008, 35 (14)
1234