Long-Term Trends in Extreme Temperatures in Hong Kong and Southern China |
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Authors: | T C LEE H S CHAN E W L GINN and M C WONG |
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Affiliation: | Hong Kong Observatory, 134A, Nathan Road, Hong Kong,Hong Kong Observatory, 134A, Nathan Road, Hong Kong,Hong Kong Observatory, 134A, Nathan Road, Hong Kong,Hong Kong Observatory, 134A, Nathan Road, Hong Kong |
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Abstract: | The observed long-term trends in extreme temperatures in Hong Kong were
studied based on the meteorological data recorded at the Hong Kong
Observatory Headquarters from 1885--2008. Results show that, over the past
124 years, the extreme daily minimum and maximum temperatures, as well as
the length of the warm spell in Hong Kong, exhibit statistically significant
long-term rising trends, while the length of the cold spell shows a
statistically significant decreasing trend. The time-dependent return period
analysis also indicated that the return period for daily minimum temperature
at 4oC or lower lengthened considerably from 6 years in 1900 to over
150 years in 2000, while the return periods for daily maximum temperature
reaching 35oC or above shortened drastically from 32 years in 1900 to
4.5 years in 2000. Past trends in extreme temperatures from selected weather
stations in southern China from 1951--2004 were also assessed. Over 70%
of the stations studied yielded a statistically significant rising trend in
extreme daily minimum temperature, while the trend for extreme maximum
temperatures was found to vary, with no significant trend established for
the majority of stations. |
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Keywords: | extreme temperature long-term trend Hong Kong southern China |
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