Statistical downscaling of projected precipitation in two major Southeast Queensland catchments

Blazak, Adam and Ribbe, Joachim (2010) Statistical downscaling of projected precipitation in two major Southeast Queensland catchments. In: 17th National Conference of the Australian Meteorological and Oceanographic Society: Atmosphere, Oceans, Environment and Society, 27-29 Jan 2010, Canberra, Australia.

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Southeast Queensland has experienced a drying trend over the last 50 years and dam levels have reached critically low levels. The region is subject to significant natural climate variability making it difficult to attribute the drying trend to climate change or natural variability. Accurate rainfall projections would be useful for water resources managers of the region. Global climate model (GCM) resolution is unable to resolve rainfall on a local to regional scale and downscaling of this data can be employed to provide information on a regional scale. This study uses linear regression to correlate climatic predictors with precipitation at locations in the catchments of Upper Brisbane and Stanley, which feed into Wivenhoe and Somerset dams respectively. Australian Bureau of Meteorology monthly rainfall data from 1945 to 2000 are correlated with climate predictors from 19 Intergovernmental Panel on Climate Change GCM simulations for the 20th Century using stepwise regression in the statistical program “R”. These statistical models are then used to recreate monthly rainfall totals for the same period and a correlation coefficient is calculated to determine the level of skill of each. Initial results show that the simulations are able to track seasonal variations but are unable to detect extreme events which are often responsible for the significant increases in dam levels. A 150 year projection of future rainfall in the region has been made using a 720ppm emission scenario. Monthly rainfall at Crows Nest and Mount Brisbane showed a general decrease whilst Peachester showed an increase.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: No
Item Status: Live Archive
Additional Information: Speech presentation. Conference publication consists of only the abstracts of papers presented at the conference. Abstract only posted here. No evidence of copyright restrictions on web site.
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 13 Apr 2010 06:07
Last Modified: 02 Jul 2013 23:44
Uncontrolled Keywords: rainfall, climate change, drought, Queensland, Australia, downscaling
Fields of Research : 04 Earth Sciences > 0401 Atmospheric Sciences > 040104 Climate Change Processes
Socio-Economic Objective: D Environment > 96 Environment > 9603 Climate and Climate Change > 960303 Climate Change Models

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