中文摘要：

利用广东大亚湾沿海1个80 m气象铁塔2003年1月—2004年12月离地面10 m和80 m的逐时风向、风速、温度梯度资料和1.5 m的相对湿度资料,用温度梯度、Ri数、风速比、温度梯度与风速4种不同判据把大气状态分成强不稳定、不稳定、弱不稳定、中性、较稳定和稳定6种不同稳定度,分析研究不同大气稳定度分类方法在沿海地区的适用性。研究表明,沿海地区以理查逊数（Ri）法对6类大气稳定度的区分能力最好,温度梯度和风速比法最差。

英文摘要：

Using two years（Jan.,2003 to Dec.,2004） data that include 10 m and 80 m wind direction,wind speed,temperature gradient and relative humidity at the height of 1.5 m of an 80 m-high meteorological tower situated in Guangdong Daya Bay nuclear power plant,this paper analyzes the surface layer stability.By comparing the temperature gradient,Richard number,wind speed ratio,and combining methods of temperature gradient and wind speed ratio,we found that the Richard number is suitable to classify atmosphere stability at coastal areas but the temperature gradient and wind speed ratio methods are worse and their results cannot be used.So the method of Richard number is recommended to classify atmosphere stability at coastal areas.