太湖水体势能异常及水体层化的特征及其机制  

Mechanism and characteristics on potential energy anomaly and water stratification in Lake Taihu

作　　者：赵巧华[1] 秦泉[2] 杭蓉蓉 王玲[2] 

机构地区：[1]南京信息工程大学水文气象学院,江苏南京210044 [2]南京信息工程大学地理与遥感学院,江苏南京210044

出　　处：《大气科学学报》2014年第6期780-785,共6页Transactions of Atmospheric Sciences

基　　金：国家自然科学基金资助项目(41371222);国家重大科技专项(2012ZX07101-010)

摘　　要：大型浅水湖泊的水体势能异常和层化对水生生态环境演变、局地天气及气候系统有着重要的影响。基于2009年8月11—22日和3月17—28日的气象数据及水温廓线,探讨了太湖水体势能异常和表层混合层深度的变化规律及其机制。结果表明:太湖水体势能异常呈现明显的日变化特征,晚间水体势能异常消失,而白天逐步凸现出来;水—气之间的热量交换是影响水体势能异常和水体层化程度的关键性因子;夏季水体势能异常和层化程度远强于春季,其主要原因是夏季风场引起的混合作用比春季弱,而夏季水—气热量交换对水体势能异常的增强作用比春季强;水体势能异常程度与表层混合层深度存在显著的指数关系。The potential energy anomaly and surface layer stratification in large shallow lakes have an important influence on the local weather and climate systems and aquatic ecological environment evolu- tion.Based on the meteorological data and water temperature profiles during 17--28 March and 11--22 August 2009, the variation law and mechanism of potential energy anomaly and surface mixed layer depth in Lake Taihu were studied.Results show that there is a significant diurnal variation for the poten- tial energy anomaly and water stratification in Lake Taihu. The potential energy anomaly is gradually destroyed in nighttime and strengthened in daytime, respectively.The net heat flux between water and air is the key factor influencing on the potential energy anomaly and water stratification in Lake Taihu.The potential energy anomaly in summer is stronger than that in spring, which is resulted from the weak mixing effect originated from wind and the strong strengthening effect caused by the net heat flux on the potential energy anomaly in summer.There is a significant exponential relationship between the po- tential energy anomaly and the surface mixed layer depth.

关 键 词：水体势能异常 水体层化 表层混合层深度 太湖 

分 类 号：P343.3[天文地球—水文科学]