The characteristics of seasonal and annual changes of potential evaporation,the variations of thermal and dynamical evaporation in different seasons and the relationshipsbetween potential evaporation and meteorologica...The characteristics of seasonal and annual changes of potential evaporation,the variations of thermal and dynamical evaporation in different seasons and the relationshipsbetween potential evaporation and meteorological elements were analyzed according to the observeddata of 9 stations from 1961 to 2001 in the Tianjin region of China. Analyses indicate that thermalevaporation is the main part of the potential evaporation and offers about 90% fraction of to it insummer, while in winter the dynamical evaporation is greater than the thermal one, especially inJan. , offering 100% contribution, that the influence of temperature on the change of potentialevaporation was much larger than that of wind, vapor pressure and sunshine duration, and potentialevaporation increased by 30. 33mm with temperature raise 1℃, and that potential evaporation had asurprising increasing tendency, in particular during the recent decade, with the velocity of 4.22mm/a. The potential evaporation in the Tianjin region will be higher than the past, especially onthe global warming background, so that it has the great effects not only on the climatic forcingchanges, but also on development of city and e-conomy.展开更多
文摘The characteristics of seasonal and annual changes of potential evaporation,the variations of thermal and dynamical evaporation in different seasons and the relationshipsbetween potential evaporation and meteorological elements were analyzed according to the observeddata of 9 stations from 1961 to 2001 in the Tianjin region of China. Analyses indicate that thermalevaporation is the main part of the potential evaporation and offers about 90% fraction of to it insummer, while in winter the dynamical evaporation is greater than the thermal one, especially inJan. , offering 100% contribution, that the influence of temperature on the change of potentialevaporation was much larger than that of wind, vapor pressure and sunshine duration, and potentialevaporation increased by 30. 33mm with temperature raise 1℃, and that potential evaporation had asurprising increasing tendency, in particular during the recent decade, with the velocity of 4.22mm/a. The potential evaporation in the Tianjin region will be higher than the past, especially onthe global warming background, so that it has the great effects not only on the climatic forcingchanges, but also on development of city and e-conomy.
