Atlantic Zonal Mode: An Emerging Source of Indian Summer Monsoon Variability in a Warming World

C. T. Sabeerali, Ajaya Ravindran, Hamza Kunhu Bangalath, Nan Chen

Research output: Contribution to journalArticle

Abstract

Atlantic Zonal Mode (AZM) and Indian summer monsoon rainfall (ISMR) are known to have an inverse relationship, which means that the cold (warm) phases of AZM result in strong (weak) ISMR. Here, we report that the inverse relationship between AZM and ISMR has significantly strengthened in recent decades. The cause of this strengthening relationship has been investigated. We find a robust increase in interannual variability of sea surface temperature over the eastern tropical Atlantic Ocean in recent decades, which implies an increase in the number of strong AZM events toward the end of the twentieth century. The increase in strong AZM events alters the large-scale monsoon circulation over the Indian subcontinent by enhancing the Kelvin wave response into the Indian Ocean, leading to an enhanced AZM-ISMR teleconnection. This demands a better representation of the AZM-ISMR teleconnection in climate models for improving seasonal monsoon prediction in a warming world.

Original languageEnglish (US)
Pages (from-to)4460-4467
Number of pages8
JournalGeophysical Research Letters
Volume46
Issue number8
DOIs
StatePublished - Apr 28 2019

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monsoons
summer
emerging
monsoon
warming
heating
rainfall
teleconnection
Kelvin waves
Kelvin wave
Atlantic Ocean
Indian Ocean
climate models
sea surface temperature
world
twentieth century
climate modeling
causes
ocean
prediction

Keywords

  • Atlantic Zonal Mode
  • Indian summer monsoon
  • teleconnection

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Atlantic Zonal Mode : An Emerging Source of Indian Summer Monsoon Variability in a Warming World. / Sabeerali, C. T.; Ravindran, Ajaya; Bangalath, Hamza Kunhu; Chen, Nan.

In: Geophysical Research Letters, Vol. 46, No. 8, 28.04.2019, p. 4460-4467.

Research output: Contribution to journalArticle

Sabeerali, C. T. ; Ravindran, Ajaya ; Bangalath, Hamza Kunhu ; Chen, Nan. / Atlantic Zonal Mode : An Emerging Source of Indian Summer Monsoon Variability in a Warming World. In: Geophysical Research Letters. 2019 ; Vol. 46, No. 8. pp. 4460-4467.
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