不同大气稳定度分类方法的比较研究

Comparative Study on Classification Methods of Different Atmospheric Stability

根据河北海兴核电厂址气象站2015年1月1日~2015年1月15日期间10 m和100 m高度处风速和温度观测气象资料,分别用温度梯度分类法(ΔT/ΔZ),温度梯度—风速法(ΔT-u)、理查森数(Ri)法、莫宁-奥布霍夫长度(L)法判定大气稳定度,结果表明:主导风都处于SW-WSW风向上,ΔT/ΔZ法与ΔT-u法出现稳定类天气最多,中性天气次之;Ri法与L法稳定类天气最多,不稳定性天气次之。对四种大气稳定度分类方法做对比分析,ΔT/ΔZ法与ΔT-u法的测量比较简单,能够快速的判定大气的稳定度。Ri法与L法对观测资料要求较多,能够较准确的判定大气稳定度。

According to the observed meteorological data at 10 and 100 m from the nuclear plant of Haixin in Hebei during 1 th^15 th in January,2015,temperature-gradient classification(ΔT/ΔZ),temperature gradient-wind velocity methods,Richardson number(Ri)and Monin-Obukhov length(L)are used to estimate the atmospheric stability.The results show that stable conditions appear most frequently using the methods ofΔT/ΔZ andΔT-u,and the frequency of neutral conditions comes second;stable case also appears most frequently using the method of Ri and L,closely following by unstable case,and neutral case is the fewest.Comparative analysis shows that the methods ofΔT/ΔZ andΔT-u are easy to quickly determine the atmospheric stability,Ri-and L-methods are more accurate despite of requiring a lot of observed data.