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| Titel |
Scaling and trends of hourly precipitation extremes in two different climate zones – Hong Kong and the Netherlands |
| VerfasserIn |
G. Lenderink, H. Y. Mok, T. C. Lee, G. J. Oldenborgh |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 9 ; Nr. 15, no. 9 (2011-09-29), S.3033-3041 |
| Datensatznummer |
250012969
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| Publikation (Nr.) |
 copernicus.org/hess-15-3033-2011.pdf |
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| Zusammenfassung |
| Hourly precipitation extremes in very long time series from the Hong
Kong Observatory and the Netherlands are investigated. Using the 2 m
dew point temperature from 4 h before the rainfall event as a measure
of near surface absolute humidity, hourly precipitation extremes
closely follow a 14% per degree dependency – a scaling twice as
large as following from the Clausius-Clapeyron relation. However, for
dew point temperatures above 23 °C no significant dependency on
humidity was found. Strikingly, in spite of the large difference in
climate, results are almost identical in Hong Kong and the Netherlands
for the dew point temperature range where both observational sets have
sufficient data. Trends in hourly precipitation extremes show
substantial increases over the last century for both De Bilt (the
Netherlands) and Hong Kong. For De Bilt, not only the long term trend,
but also variations in hourly precipitation extremes on
an inter-decadal timescale of 30 yr and longer, can be linked very
well to the above scaling; there is a very close resemblance between
variations in dew point temperature and precipitation intensity with
an inferred dependency of hourly precipitation extremes of 10 to
14% per degree. For Hong Kong there is no connection between
variations in humidity and those in precipitation intensity in the wet
season, May to September. This is consistent with the found zero-dependency of
precipitation intensity on humidity for dew points above
23 °C. Yet, outside the wet season humidity changes do appear to
explain the positive trend in hourly precipitation extremes, again
following a dependency close to twice the Clausius-Clapeyron relation. |
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