西沙蒸发量的时间变化特征及与日照时间和近地面风速的关系  

Variation of the Evaporation at Xisha and its Relation with Sunshine Duration and near Surface Wind-speed

作　　者：肖伟军[1] 熊亚丽[1] 简茂球[2] 

机构地区：[1]广州中心气象台,广东广州510080 [2]中山大学季风与环境研究中心/大气科学系,广东广州510275

出　　处：《中山大学学报（自然科学版）》2007年第5期121-123,128,共4页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：中国气象局气候变化专项基金(CCSF2006-39);广东省自然科学基金(05003339)资助项目

摘　　要：用中国西沙站1962-2004年月蒸发量、日照时间和近地面风速资料,分析了西沙各季节蒸发量的时间变化特征及其与日照时间、近地面风速变化的关系。结果表明:西沙春、夏和冬季蒸发量以年代际变化方差占优,年际变化方差次之;秋季蒸发量的年际变化方差和年代际变化方差相当。四季蒸发量年代际变化与近地面风速、日照时数的年代际变化都有显著的正相关。而蒸发量的年际变化仅与日照时数的年际变化有显著的正相关。四季蒸发量减弱的变化趋势是由近地面风速的减弱和太阳辐射的减少造成的。The temporal variation of the evaporation in all seasons at Xisha and its relation with sunshine duration and the near surface wind-speed are studied with the observed potential evaporation, sunshine duration and near surface wind-speed data from 1962 to 2004. For spring, summer and winter, the dominant time-scale is interdecadal. For fall, however, the interdecadal scale and interannual scale are comparable. For all seasons, the interdecadal variations of evaporation are significantly and positively correlated with those of sunshine duration and wind- speed. However, the interannual variations of evaporation are consistent very well only with those of the sunshine duration. The decrease trend of evaporation at Xisha is due to the weakness of surface wind speed and the reduction of sunshine with time.

关 键 词：蒸发量 时间变化 日照时间 风速 西沙 

分 类 号：P341[天文地球—水文科学]