Low-frequency variability of regional sea surface temperature and rainfall in the Austral-Indonesian region

Faqih, Akhmad and Ribbe, Joachim and Meinke, Holger (2009) Low-frequency variability of regional sea surface temperature and rainfall in the Austral-Indonesian region. In: 9th International Conference on Southern Hemisphere Meteorology and Oceanography, 9-13 Feb 2009, Melbourne, Australia.

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Abstract

A study of low-frequency variability of regional sea surface temperature (SST) and rainfall in the Austral-Indonesian region on seasonal basis is conducted. This study covers an area of 90-160E and 25S-20N, which includes Indonesia and Northern Australia. The results show decadal to multidecadal variability from 9 to more than 50 year cycles, with consistently dominant 14 years cycle obtained from the spectral analysis of the principal SST loading. These might be linked to the Pacific Inter-Decadal Oscillation (PDO) and the Interdecadal Pacific Oscillation (IPO) phenomenon. The analysis demonstrates correlations of the EOF scores of 9 years filtered SST data and rainfall. The seasonal patterns of these correlations are similar to the rainfall climatology patterns during 1977-2002 periods and are opposite to the climatology of 1947-76 periods particularly for the Indonesian region. Considerable upward trends of the regional SST in different areas in the Austral-Indonesian region are also found, particularly after 1980s. It is possible that climate change might have a major role in contributing to these trends. The increase of mean SST anomalies on low-frequency timescales could lead to more active ocean-atmosphere processes. These might cause an increase of more extreme rainfall events on higher frequency time scales on specific regions.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: No
Item Status: Live Archive
Additional Information: No evidence of copyright restrictions on web site. Only abstracts published, as supplied here.
Depositing User: Dr Joachim Ribbe
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 26 Mar 2010 04:33
Last Modified: 26 Sep 2013 06:17
Uncontrolled Keywords: Indonesia, climate, rainfall, IPCC, Pacific Decadal Oscillation
Fields of Research (FOR2008): 04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
Socio-Economic Objective (SEO2008): D Environment > 96 Environment > 9603 Climate and Climate Change > 960304 Climate Variability (excl. Social Impacts)
URI: http://eprints.usq.edu.au/id/eprint/7198

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