摘要
本文用1990—1991年南极中山站地区的微气象观测资料,对中山站地区的里查逊数、湍流感热交换、湍流交换系数、滞凝系数和鲍文比等湍流交换特征参数进行了初步研究,讨论了它们的变化特征。本文结果可供在进行与南极大陆沿岸地区地—气之间湍流交换特征有关的数值诊断和摸拟时参考使用。
The observing data of micrometeorological experiment near the surface at Zhongshan station in 1990—1991 were used to investigate the variation characteristics of turbulent exchange including Richardson number(Ri), sensible heat (SH), turbulent exchange coefficient (K), drag coefficient(C_D) and Bowen ratio(B_o). The preliminary results in this study are as follows. (1)Ri have an obvious annual variation. In average it is—0.115 between November to Febuary, it means that in the most time of the period the stratification near the surface is in unstable stage. But between May to July it is 0.075, the stratification is in stable. There is many days for neutral stratification with Ri value nearly zero both in April and August. The diurnal variation in summer is velativily larger, but the variation is not significant in winter. Its annual and diurnal variation characteristics are closely related to the surface absorbed radiation. (2)The annual mean intensity of sensible heat flux is—1.4W/m^2, the heat received by the surface in summer is less than lossed by the surface in winter. (3)The annual mean value of K is 0.088 m^2/s,the values are 0.102 and 0.075m^2/s in summer and in winter respectively. This means the intensity of the turbulent exchange is very weak in the coast of Antarctic Continent. (4)The annual mean value of C_D iS 1.11×10^(-3). The summer value for C_D is 1. 19×10^(-3)which is comparable with that in winter of Qinghai—Xizang Plateau. The value of C_D in winter is less than that in summer. (5)In summer, Bowen ratio is 1.25, the sensible and latent heat fluxes are almost similar in magnitude. In winter, Bowen ratio is more than 10 which indicates the latent heat is quite small.
出处
《南极研究》
CSCD
1993年第1期31-38,共8页
关键词
大气
湍流
特征参数
南极中站
Zhongshan Station
turbulent exchange
Richardson number
turbulent exchange coefficient
drag coefficient
Bowen ratio
