Climate Dynamics

, Volume 42, Issue 3, pp 1043–1052

Decadal changes in the relationship between the Indian and Australian summer monsoons

  • Karumuri Ashok
  • C. Nagaraju
  • A. Sen Gupta
  • D. S. Pai
Article

DOI: 10.1007/s00382-012-1625-4

Cite this article as:
Ashok, K., Nagaraju, C., Gupta, A.S. et al. Clim Dyn (2014) 42: 1043. doi:10.1007/s00382-012-1625-4

Abstract

In this study, we investigate a long-term modulation in the relationship between Indian summer monsoon rainfall with the subsequent Australian summer monsoon rainfall. The two monsoon rainfall time series are significantly correlated at 0.3 at the 99 % confidence level. However, the relationship weakens during the 1932–1966 period, with the inter-monsoon correlation for the period falling below statistical significance. We find that this modulation is consistent with a breakdown of the typical El Niño-Southern Oscillation (ENSO) influence on sea surface temperature in the northern region of Australia, during this period. In addition, a change in the relative influences of ENSO and Indian Ocean Basin-wide Warming sea surface temperature anomalies on the Australian summer monsoon rainfall is also apparent across different time periods.

Keywords

Tropospheric Biennial Oscillation Indian summer monsoon Australian summer monsoon ENSO ENSO Modoki Air–sea interaction IOBW 

Supplementary material

382_2012_1625_MOESM1_ESM.tif (4 mb)
Supplementary material Figure S1: Homogeneous monsoon regions of India and Australia. ISMR calculated as area-averaged rainfall over the Indian land mass from June to September and ASMR calculated as area-averaged rainfall over the region 120°E–154°E, 22°S–10°S from December to following February of each year. (TIFF 4100 kb)
382_2012_1625_MOESM2_ESM.tif (4.5 mb)
Supplementary material Figure S2: Rainfall anomaly composite during El Niño events from 1900 to 2009 over India (left) and Australia (right). (TIFF 4596 kb)
382_2012_1625_MOESM3_ESM.tif (9.1 mb)
Supplementary material Figure S3: IOBM–ASMR correlations removing El Niño Modoki (upper panel) and NINO3–ASMR correlation removing El Niño Modoki (lower panel) for 1903–1931 (1st column), 1932–1966 (2nd column), 1967–1992 (3rd column) and 1993–2009 (4th column). (TIFF 9339 kb)

Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Karumuri Ashok
    • 1
  • C. Nagaraju
    • 1
    • 2
  • A. Sen Gupta
    • 3
  • D. S. Pai
    • 4
  1. 1.Centre for Climate Change ResearchIndian Institute of Tropical MeteorologyPuneIndia
  2. 2.Computational Earth SciencesCentre for Development of Advanced ComputingPuneIndia
  3. 3.Climate Change Research Centre & ARC Centre of Excellence for Climate System Science, University of New South WalesSydneyAustralia
  4. 4.India Meteorological DepartmentPuneIndia

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