An investigation on rainfall patterns and the general circulation in the southwest Pacific region

Deo, Ravinesh C. (2004) An investigation on rainfall patterns and the general circulation in the southwest Pacific region. In: 16th Australia New Zealand Climate Forum: Climate and Water (ANZCF2004), 8-10 Nov 2004 , Lorne, Vic., Australia.

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An analysis of ten-year mean precipitation data from 1990 – 1999 is presented, that examines precipitation trends for the western Pacific region, bounded by 155˚E – 135˚W, 15˚N – 30˚S. Wind fields derived from the NCEP/NCAR reanalysis data are presented for the same period of study to examine the nature of the airflow for study region. To investigate the possible impacts of convergence and divergence on precipitation distribution, surface and 200 hPa divergence fields are derived using the wind fields and
correlated with the precipitation data. Correlation between mean monthly Southern Oscillation Index (SOI) and precipitation is also carried out.

The precipitation patterns reveal several features that are prominent during the monthly and seasonal time scales. There is a rise in precipitation during highly negative surface divergences and a fall during positive surface divergences on the spatial map. It has been shown that summer shows the highest negative correlation between precipitation and surface divergence while autumn shows the least at the 5% level of significance. Correlation between SOI and precipitation indicates that highly positive correlation between the two variables exists along the zone of the South Pacific Convergence Zone (SPCZ).

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Other)
Refereed: Yes
Item Status: Live Archive
Additional Information: No evidence of copyright restrictions on web site. Conference publication consists of only the abstracts of papers presented at the conference. Abstract only posted here.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Maths and Computing
Date Deposited: 15 Apr 2010 01:37
Last Modified: 14 Jun 2016 01:30
Uncontrolled Keywords: precipitation; general circulation; Western Pacific
Fields of Research : 04 Earth Sciences > 0401 Atmospheric Sciences > 040104 Climate Change Processes
04 Earth Sciences > 0401 Atmospheric Sciences > 040102 Atmospheric Dynamics
04 Earth Sciences > 0401 Atmospheric Sciences > 040105 Climatology (excl.Climate Change Processes)
Socio-Economic Objective: D Environment > 96 Environment > 9603 Climate and Climate Change > 960309 Effects of Climate Change and Variability on the South Pacific (excl. Australia and New Zealand) (excl. Social Impacts)

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