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Seasonal variations in size and intensity of the Indo-western Pacific warm pool in different sectors

  • Yuqi Wang
  • Renguang WuEmail author
  • Zhiping Wen
Original Article
  • 30 Downloads

Abstract

The present study investigates the roles of solar radiation and monsoon wind in annual and semiannual variations of size and intensity of the Indo-western Pacific warm pool. The Indo-western Pacific warm pool is divided into four sectors with the equator and 100°E (north of the equator) and 135°E (south of the equator) longitude as the demarcations. These sectors display different seasonal variations in size and intensity and different roles of surface heat flux and oceanic processes. The size of the North Indian Ocean warm pool displays a semiannual variation with two peaks in May and October, while that in the other three sectors shows an annual variation. These features are attributable to a dominant role of solar radiation in the four sectors and an additional effect of the Asian monsoon in the North Indian Ocean sector. The intensity of the warm pool displays semianunal variations, with two peaks in May and August in the North Indian Ocean sector, April and November in the South Indian Ocean sector, May–June and September in the North Pacific Ocean sector and December and April in the South Pacific Ocean sector. The semiannual feature is associated with two effects of monsoon winds: wind-induced ocean advection and convection-related cloud-radiation changes. These two changes induce a decrease of sea surface temperature during the monsoon period, leading to the formation of semiannual variations in the size and intensity of the warm pool.

Keywords

Indo-western Pacific warm pool Semiannual seasonal variation Surface heat flux Ocean advection Monsoon effects 

Notes

Acknowledgements

This study is supported by the National Natural Science Foundation of China Grants (41530425, 41775080, 41721004 and 41475081). The NCEP-DOE Reanalysis 2 data were obtained from ftp://ftp.cdc.noaa.gov/. The GODAS data were obtained from https://www.esrl.noaa.gov/psd/data/gridded/data.godas.html.

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Copyright information

© The Oceanographic Society of Japan and Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  1. 1.Cener for Monsoon System Research, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijingChina
  3. 3.School of Earth SciencesZhejiang UniversityHangzhouChina
  4. 4.Department of Atmospheric and Oceanic Sciences/Institute of Atmospheric SciencesFudan UniversityShanghaiChina

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