Spatial and temporal characteristics of potential evapotranspiration trends over China

Authors
Citation
A. Thomas, Spatial and temporal characteristics of potential evapotranspiration trends over China, INT J CLIM, 20(4), 2000, pp. 381-396
Citations number
38
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
INTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN journal
0899-8418 → ACNP
Volume
20
Issue
4
Year of publication
2000
Pages
381 - 396
Database
ISI
SICI code
0899-8418(20000330)20:4<381:SATCOP>2.0.ZU;2-P
Abstract
This paper analyses the time series (1954-1993) of Penman-Monteith evapotra nspiration estimates for 65 stations in mainland China and Tibet, for the c ountry as a whole and for individual stations. The analysis shows that for China as a whole, the potential evapotranspiration (PET) has decreased in a ll seasons. On a regional basis, northeast and southwest China have experie nced moderate evapotranspiration increases, while in northwest and southeas t China evapotranspiration has decreased to a much higher extent. South of 35 degrees N, sunshine appears to be most strongly associated with evapotra nspiration changes while wind, relative humidity and maximum temperature ar e the primary factors in northwest, central and northeast China, respective ly. In the mountains of southwest China, a positive relation between evapot ranspiration change and station altitude has been observed. If observed pre cipitation and PET trends remain unchanged future agricultural production, particularly in south and southwest China, will have to cope with decreasin g water availability in the growing season. Copyright (C) 2000 Royal Meteor ological Society.