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Precipitation trends in Victoria, Australia

Rahmat, Siti Nazahiyah and Jayasuriya, Niranjali and A. Bhuiyan, Muhammed (2015) Precipitation trends in Victoria, Australia. Journal of Water and Climate Change, 6 (2). pp. 274-287. ISSN 2040-2244


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Annual rainfall series trends were investigated for more than 100 years of data using two nonparametric trend tests Mann-Kendall (MK) and Sen's slope (Q) for five selected meteorological stations in Victoria, Australia. The annual rainfall time series showed no significant trends for any of the fle stations. To assess the sensitivity of trends to the length of the time periods considered, the annual rainfall anatysis was repeated using recent data from approximately half the data set between 1949 and 2011. Contrasting results from the original full data set analysis were revealed. All five stations showed decreasing trends with two stations showing significant trends suSSesting that this recent time period has added more lol/ precipitation data to the time series. The year of abrupt changes for all the five stations identified using the sequential MK test varied. Conclusions drawn from this paper, point to the importance of selecting the time series data length in identifying trends and abrupt changes. Due to the climate variability, trend testing resulb miSht be biased and strongly dependent on the data period selected. Therefore, use of the full data set available would be required in order to improve understanding of change or to undertake any further studies.

Item Type: Article
Uncontrolled Keywords: Mann-Kendall test; non-parametric trend test; Sen's slope; sequential Mann-Kendall test
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Faculty of Civil and Environmental Engineering > Department of Water and Environmental Engineering
Depositing User: Normajihan Abd. Rahman
Date Deposited: 11 Nov 2015 07:23
Last Modified: 11 Nov 2015 07:23
URI: http://eprints.uthm.edu.my/id/eprint/6974
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