%0 Journal Article %T 大型浅水湖泊水体对流混合速率分析 %T Waterside convective velocity in a large and shallow lake: A case of Lake Taihu %A 肖启涛,段洪涛,张弥,刘寿东,胡正华,李旭辉 %A XIAO,Qitao %A DUAN,Hongtao %A ZHANG,Mi %A LIU,Shoudong %A HU,Zhenghua %A LI,Xuhui %J 湖泊科学 %J Journal of Lake Sciences %@ 1003-5427 %V 32 %N 4 %D 2020 %P 1189-1198 %K 对流混合;浅水湖泊;昼夜变化;季节变化;空间变化;太湖 %K Waterside convective;shallow lake;diurnal variation;seasonal variation;spatial variation;Lake Taihu %X 湖泊水体的对流混合是最基本的物理过程,其能显著影响湖泊生态系统温室气体等循环,但浅水湖泊水体对流混合的研究鲜有报道.本研究基于太湖(面积2400 km2,平均水深1.9 m)中尺度通量网的原位、高频、连续和多点的观测数据,分析该大型浅水湖泊水体对流混合速率w*的时空特征.结果表明太湖水体w*的均值为2.49 mm/s,因太湖的风速、水温和辐射等物理参数无空间变化,w*也无明显的空间变化.但是研究表明w*呈现显著的昼夜变化和季节变化,且昼夜变化幅度强于季节变化.总体上夜间w*是白天的4倍多,冬季w*(均值1.79 mm/s)明显低于春季(均值2.42 mm/s)、夏季(均值2.91 mm/s)和秋季(均值2.82 mm/s).太湖w*主要受风速和能量收支影响,白天风速是主要驱动因子,夜晚能量收支是主要驱动因子. %X Waterside convective controlling aquatic greenhouse gases cycle is a common physical process in lakes. However, the physical process was less studied in shallow lakes. This study investigated the waterside convective strength, which was expressed with a waterside convective velocity scale (w*), in a large (area 2400 km2) and shallow (mean depth 1.9 m) lake based on in-situ high-frequency monitoring data. Results showed that the w* with an annual mean value of 2.49 mm/s was relatively uniform in space. However, the w* had an obvious diurnal variation, the value in nighttime was about four times higher than that in daytime. Meanwhile, the w* varied seasonally, the peak value generally occurred in summer and lowest in winter. It should be noted that the diurnal variation of w* was more significant compared to the seasonal variation. Our results also demonstrated that daytime w* was driven by wind speed, and nighttime w* was driven by energy budget. %R 10.18307/2020.0425 %U http://www.jlakes.org/ch/reader/view_abstract.aspx %1 JIS Version 3.0.0