4.7 Article

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

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SCIENTIFIC REPORTS
卷 4, 期 -, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/srep04943

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资金

  1. National Natural Science Foundation [41276034, 40806014]
  2. Chinese Ministry of Science and technology through the National Basic Research Program [2011CB403502]
  3. Scientific Research Foundation of Third Institute of Oceanography, SOA [TIO2008014]
  4. Australian Climate Change Science Programme, The Goyder Institute
  5. CSIRO Wealth from Oceans National Research Flagship

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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.

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