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Advances in Meteorology
Volume 2014 (2014), Article ID 450691, 12 pages
http://dx.doi.org/10.1155/2014/450691
Research Article

Impact of Preceding El Niño and the Indian Ocean Dipole on the Southern China Precipitation in Early Summer

1National Marine Data and Information Service, Tianjin 300171, China
2State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, 46 Zhongguancun Southern Street, Haidian, Beijing 100081, China
3Tianjin Meteorological Observatory, Tianjin 300074, China

Received 31 October 2013; Accepted 22 January 2014; Published 11 March 2014

Academic Editor: Anthony R. Lupo

Copyright © 2014 Yan Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Delayed impacts of El Niño and the Indian Ocean Dipole in positive phase (P-IOD) on the South China early monsoon were investigated by observations and simulations. The most significant correlation between IOD index (IODI) and NINO3 appeared in boreal autumn. A new index (IODN3) related to the intensity of El Niño and IOD was created. Three indexes in boreal autumn were positively well correlated with the rainfall over the Yangtze River and its southern area (rain-YRBS) in next June. The most significant correlation appeared between IODN3 and rain-YRBS. Positive rain-YRBS anomalies in June tend to occur after P-IOD or El Niño solely matured in previous boreal autumn. However, when both events matured in boreal autumn, rain-YRBS anomalies tended to be more enhanced, which suggests that a delayed combined influence of both events on rain-YRBS in June was larger than that of either event alone. There was a low level anticyclonic circulation around the Philippines (PSAC) that developed in boreal autumn and was maintained until the following June when the single event occurred. However, a much stronger PSAC tended to occur when both events matured. The stronger PSAC could transport more water vapor to YRBS and cause more rainfall there in June.