【作者】 李天然； 罗森波； 林良根； 吴乃庚； 邝建新；

【Author】 Li Tianran1,2 Luo Senbo2 Lin Lianggen2 Wu Naigen2 Kuang Jianxing2 1 Chinese Academy of Meteorological Sciences,Beijing 100081 2 Guangzhou Central Meteorological Observatory,Guangzhou 510080

【机构】 中国气象科学研究院； 广州中心气象台；

【摘要】 本文利用广州新电视塔上安装的自动站获取的500m高度以下的气象数据,重点对风速、温度、相对湿度等要素的变化特征进行了分析研究,得到如下主要结论:1)广州城市大气边界层低层"夜间风弱、白天风强",高空中正相反是"夜间风强、白天风弱",逆转的临界高度约为120~200m之间;广州新电视塔附近大气边界层的幂指数为0.211;幂指数与风速满足对数拟合方程;幂指数具有明显的日变化特征,其值与大气层结有关;幂指数在特殊情况下会出现负值。2)广州城市大气边界层的温度直减率r均值为0.84℃/100m;温度直减率具有明显的日变化特征,其中200~300m高度温度直减率白天和夜间变化幅度均大于其它高度层;逆温夜间出现多、白天出现少,而且主要出现在100~200m和300~400m两个高度区间。3)广州新电视塔附近粗糙度约为1m,而且粗糙度亦有明显的日变化特征。4)广州城市大气边界层的相对湿度随高度变化率均值为1.17%/100m;相对湿度和相对湿度随高度变化率均有明显的日变化特征;除200~300m夜间段以外,各个高度层的相对湿度随高度变化率均为正值。更多还原

【Abstract】 The meteorological characteristics of windspeed, temperature and relative humidity are analyzed by using the observed data of new Guangzhou Tv tower in the paper,. Results indicate: 1) Wind speed was weaker at night and it was stronger in daytime in lower layer of Guangzhou urban ABL. But the characteristics of wind speed in higher layer were opposite. And the critical reversal height was located at 120~200 m. The average power parameter was 0.211. The relations between power parameter and wind speed could be fitted by logarithm equation. Power parameter had the characteristics of diurnal cycle. And its value related to atmospheric stratification. Power parameter would be minus in special condition. 2) The average temperature lapse rate of Guangzhou urban ABL at new TV tower is 0.84 ℃/100 m.. It had obvious diurnal cycle characteristics. Particularly, the change ranges of temperature lapse rate in layer of 200~300 m were bigger than other layers at night and in daytime. Inversion temperatures were mainly occurred at night. And its main layers were located at 100~200 m and 300~400 m. 3) Roughness of new Guangzhou TV tower was about 1 m. And roughness had the characteristics of diurnal cycle. 4) Variation rate of relative humidity of Guangzhou urban ABL was about 1.17 %/100m. Relative humidity and its variation rates with height had obvious characteristics of diurnal cycle. All variation rates of relative humidity were positive except the rates of 200~300 m layer at night.更多还原