Advances in Atmospheric Sciences

, Volume 30, Issue 1, pp 219–234

Role of Western Pacific Oceanic variability in the onset of the Bay of Bengal summer monsoon

  • Junqiao Feng (冯俊乔)
  • Dunxin Hu (胡敦欣)
  • Lejiang Yu (于乐江)
Article

DOI: 10.1007/s00376-012-2040-9

Cite this article as:
Feng, J., Hu, D. & Yu, L. Adv. Atmos. Sci. (2013) 30: 219. doi:10.1007/s00376-012-2040-9

Abstract

The influence of the tropical Indo-Pacific Ocean heat content on the onset of the Bay of Bengal summer monsoon (BOBSM) onset was investigated using atmospheric data from the NCEP and ocean subsurface temperature data from the Japan Metorology Agency (JMA). Results showed that the onset time of the BOBSM is highly related to the tropical Pacific upper ocean heat content (HC), especially in the key region of the western Pacific warm pool (WPWP), during the preceding winter and spring. When the HC anomalies in the WPWP are positive (negative), the onset of the BOBSM is usually early (late). Accompanied by the variation of the convection activity over the WPWP, mainly induced by the underlying ocean temperature anomalies, the Walker circulation becomes stronger or weaker. This enhances or weakens the westerly over the tropical Indian Ocean flowing into the BOB in the boreal spring, which is essential to BOBSM onset. The possible mechanism of influence of cyclonic/anti-cyclonic circulation over the northwestern tropical Pacific on BOBSM onset is also discussed.

Key words

summer monsoon onset ocean heat content warm pool Bay of Bengal 

Copyright information

© Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Junqiao Feng (冯俊乔)
    • 1
    • 2
  • Dunxin Hu (胡敦欣)
    • 1
    • 2
  • Lejiang Yu (于乐江)
    • 3
  1. 1.Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.Key Laboratory of Ocean Circulation and WaveChinese Academy of SciencesQingdaoChina
  3. 3.Applied Hydrometeorological Research InstituteNanjing University of Information Science and TechnologyNanjingChina

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