Precipitation trends in Victoria, Australia
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...
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| Main Authors: | , , |
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| Format: | Article |
| Published: |
IWA Publishing
2015
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/6974/ http://eprints.uthm.edu.my/6974/1/siti_nazahiyah_rahmat_U.pdf |
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| Summary: | 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. |
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