冬季增城丘陵灌木林基本气象要素与湍流特征

发布时间：2018-05-19 13:44

  本文选题：增城 + 丘陵灌木林　； 参考：《热带气象学报》2017年05期

【摘要】：介绍了广州增城丘陵灌木林通量站的地理环境、仪器布设,并利用该站2014年12月—2015年2月的观测资料,分析冬季华南丘陵灌木林下垫面近地层的风、温度、气压、湿度和大气稳定度等基本气象要素特征,以及湍流强度、风速归一化标准差的统计特征及通量特征。结果表明:(1)冬季增城站以北向小风为主,风速多小于4 m/s,日平均温度变化剧烈,平均相对湿度为67.94%;(2)大气稳定度集中于"±"0.5之间,以近中性为主;冬季平均湍流强度I_u、I_v和I_w分别为0.37、0.31和0.19;在风速小于1 m/s时湍流发展旺盛,随风速增大,湍流强度减小并趋于稳定;(3)风速分量归一化标准差δu/u*、δv/u*、δw/u*与稳定度Z/L之间满足莫宁-奥布霍夫相似理论,并呈1/3次方关系,且随|Z/L|的减小而减小,在中性层结(Z/L→0)均匀下垫面,其值为常数,分别为2.286、1.757和1.174;(4)冬季增城站的能量耗散以感热为主,晴天尤为显著;阴天感热与潜热大小相当;平均日间吸收CO_2极值为0.236 mg/(m~2·s)。
[Abstract]:This paper introduces the geographical environment and instrument layout of the shrub flux station in Zengcheng hilly area, Guangzhou, and analyzes the wind, temperature and pressure on the underlying surface of shrubbery in south China in winter by using the observation data of this station from December 2014 to February 2015. The characteristics of basic meteorological elements such as humidity and atmospheric stability, as well as the statistical characteristics and flux characteristics of the normalized standard deviation of turbulence intensity and wind speed. The results show that the small wind in north of Zengcheng station is dominant in winter, the wind speed is less than 4 m / s, the daily average temperature changes sharply, the average relative humidity is 67.94 / 2) the atmospheric stability is concentrated in the range of "卤" 0.5, and is mainly near neutral. The average turbulence intensity in winter is 0.37 / 0.31 and 0.19 respectively. When the wind speed is less than 1 m / s, the turbulence develops strongly and increases with the wind speed. Turbulence intensity decreases and tends to stabilize.) the normalized standard deviation of wind speed components 未 u / u, 未 v / u, 未 w / u * and stability Z / L satisfy the Moning-O 'Obrahoff similarity theory, and show a 1 / 3 power relation, and decrease with the decrease of Z / L, and the uniform underlying surface is formed in the neutral layer (Z / L / L 0). The energy dissipation of Zengcheng Station in winter is mainly sensible heat, especially in sunny days, the overcast heat is equal to latent heat, and the average daytime absorption CO_2 extremum is 0.236 mg/(m~2 路s ~ (-1).
【作者单位】： 中国海洋大学海洋与大气学院;中国气象局广州热带海洋气象研究所海洋气象联合开放实验室;中国科学院南海海洋研究所热带海洋环境国家重点实验室;
【基金】：国家重点基础研究发展计划(2014CB953903) 国家自然科学基金(41275025)共同资助
【分类号】：S716.2
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本文编号：1910331