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The relative roles of the South China Sea summer monsoon and ENSO in the Indian Ocean dipole development

  • Yazhou Zhang
  • Jianping LiEmail author
  • Jiaqing Xue
  • Fei Zheng
  • Renguang Wu
  • Kyung-Ja Ha
  • Juan Feng
Article
  • 92 Downloads

Abstract

The influence of El Niño-Southern Oscillation (ENSO) on the Indian Ocean Dipole (IOD), a coupled ocean–atmosphere mode of interannual climate variability, has been widely investigated over recent decades. However, a latest study indicates that the South China Sea summer monsoon (SCSSM) might also be responsible for IOD formation. Furthermore, an abnormal SCSSM does not always coincide with ENSO during boreal summer (June–August, JJA); consequently, the individual and combined effects of the SCSSM and ENSO on the IOD remain elusive. This study shows that the amplitude of the IOD tends to be much stronger under the coexistence of SCSSM and ENSO than that under individual SCSSM or ENSO events during JJA and autumn. The findings also indicate that the SCSSM and ENSO play the dominant role around the eastern and western poles of the IOD, respectively. An anomalous local Hadley circulation closely related to the stronger SCSSM favors anomalous southeasterly off Sumatra and Java during JJA, which enhance oceanic upwelling and subsequently result in cooling of the sea surface temperature (SST) over this area. Similarly, it can be envisaged that the contemporaneous ENSO could influence JJA SST anomalies over the western Indian Ocean via the Walker circulation coupled with oceanic variations.

Keywords

Indian dipole mode South China Sea summer monsoon El Niño–Southern oscillation Individual and combined effects 

Notes

Acknowledgements

This work was jointly supported by the National Natural Science Foundation of China (NSFC) Project (41790474; 41530424) and the SOA International Cooperation Program on Global Change and Air–Sea Interactions (GASI-IPOVAI-03). The ERSST v5 dataset was derived from the International Comprehensive Ocean–Atmosphere Dataset (ICOADS) (https://www.esrl.noaa.gov/psd/data/gridded/data.noaa.ersst.v5.html). NCEP/NCAR and SODA (version 2.2.4) reanalysis datasets were available at http://www.esrl.noaa.gov/psd/data/gridded/ and https://climatedataguide.ucar.edu/climate-data/soda-simple-ocean-data-assimilation, respectively.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Global Change and Earth System Science (GCESS)Beijing Normal UniversityBeijingChina
  2. 2.Key Laboratory of Physical Oceanography-Institute for Advanced Ocean StudiesOcean University of China and Qingdao National Laboratory for Marine Science and TechnologyQingdaoChina
  3. 3.Key Laboratory of Meteorological Disaster of Ministry of Education, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Institute for Climate and Application Research (ICAR)Nanjing University of Information Science and TechnologyNanjingChina
  4. 4.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  5. 5.School of Earth SciencesZhejiang UniversityHangzhouChina
  6. 6.Center for Climate Physics, Institute of Basic ScienceBusanSouth Korea
  7. 7.Department of Atmospheric SciencesPusan National UniversityBusanSouth Korea

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