The relationship between intraseasonal and interannual variability during the asian summer monsoon

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The purpose of this paper is to investigate intraseasonal (30-70 days) and higher frequency (5-30 days) variability and its relationship to interannual variability. Various modelling studies have suggested a link between intraseasonal and interannual variability of the Asian summer monsoon. This relationship has been mainly based upon the similar spatial structures of the dominant EOF patterns of the monsoon circulation on intraseasonal and interannual time scales from simulations with simple models and atmospheric general circulation models. Here we investigate these relationships using 40 years of NCEP/NCAR Reanalysis. Motivation for this study is embodied in the suggestions of Charney and Shukla ... continued below

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Annamalai, H; Slingo, J M & Sperber, K R April 21, 1999.

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Description

The purpose of this paper is to investigate intraseasonal (30-70 days) and higher frequency (5-30 days) variability and its relationship to interannual variability. Various modelling studies have suggested a link between intraseasonal and interannual variability of the Asian summer monsoon. This relationship has been mainly based upon the similar spatial structures of the dominant EOF patterns of the monsoon circulation on intraseasonal and interannual time scales from simulations with simple models and atmospheric general circulation models. Here we investigate these relationships using 40 years of NCEP/NCAR Reanalysis. Motivation for this study is embodied in the suggestions of Charney and Shukla (1981) that boundary forcing (e.g., sea surface temperature) may predispose the monsoon system towards a dry or wet state, and the result of Palmer (1994), using the Lorenz (1963) model, that the probability of being in one regime of phase space or another is no longer equally probable in the presence of external forcing. To investigate the influence of the boundary forcing, the probability distribution functions (PDF�s) of the principal components are given.

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104 Kilobytes

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  • Twenty-Third Climate Diagnostics and Prediction Workshop, Miami, FL, October 26-30, 1998

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  • Other: DE00008306
  • Report No.: UCRL-JC-133992
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 8306
  • Archival Resource Key: ark:/67531/metadc785784

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  • April 21, 1999

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  • Dec. 3, 2015, 9:30 a.m.

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  • May 6, 2016, 11:04 p.m.

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Annamalai, H; Slingo, J M & Sperber, K R. The relationship between intraseasonal and interannual variability during the asian summer monsoon, article, April 21, 1999; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc785784/: accessed September 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.