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| Titel |
Does evaporation paradox exist in China? |
| VerfasserIn |
Z. T. Cong, D. W. Yang, G. H. Ni |
| 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 ; 13, no. 3 ; Nr. 13, no. 3 (2009-03-18), S.357-366 |
| Datensatznummer |
250011800
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| Publikation (Nr.) |
 copernicus.org/hess-13-357-2009.pdf |
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| Zusammenfassung |
| One expected consequence of global warming is the increase in evaporation.
However, lots of observations show that the rate of evaporation from open
pans of water has been steadily decreasing all over the world in the past 50
years. The contrast between expectation and observation is called
"evaporation paradox". Based on data from 317 weather stations in China
from 1956 to 2005, the trends of pan evaporation and air temperature were
obtained and evaporation paradox was analyzed. The conclusions include: (1)
From 1956 to 2005, pan evaporation paradox existed in China as a whole while
pan evaporation kept decreasing and air temperature became warmer and
warmer, but it does not apply to Northeast and Southeast China; (2) From
1956 to 1985, pan evaporation paradox existed narrowly as a whole with
unobvious climate warming trend, but it does not apply to Northeast China;
(3) From 1986 to 2005, in the past 20 years, pan evaporation paradox did not
exist for the whole period while pan evaporation kept increasing, although
it existed in South China. Furthermore, the trend of other weather factors
including sunshine duration, windspeed, humidity and vapor pressure deficit,
and their relations with pan evaporation are discussed. As a result, it can
be concluded that pan evaporation decreasing is caused by the decreasing in
radiation and wind speed before 1985 and pan evaporation increasing is
caused by the decreasing in vapor pressure deficit due to strong warming
after 1986. With the Budyko curve, it can be concluded that the actual
evaporation decreased in the former 30 years and increased in the latter 20
year for the whole China. |
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