摘要
利用深圳龙岗观测基地的30 m梯度塔超声风观测资料,对2015年1月19—23日和1月31日—2月4日深圳2次灰霾过程前后的物理通量变化进行了分析,结果表明:不同高度的通量存在着相似的日变化特征,近地层的通量输送与灰霾过程存在密切关系,30 m高度上的通量绝对值总体上要高于贴地的2 m高度,30 m通量变化滞后于2 m高度通量约6 h,同时不同高度各种通量之间关联性极高、变化趋势基本一致,与灰霾过程的能见度变化存在密切关系。低风速、高湿度是影响灰霾的主要因子,而通量的垂直扩散也是影响灰霾的一个重要因子。
The ultrasonic wind observations from a 30 m gradient tower at an observational base in Longgang, Shenzhen are used to study the variation of physical flux before and after two haze processes in Shenzhen, which took place on January 19--23 and on January 31--February 4, 2015. The result is shown as follows. The flux at different levels of altitude has similar characteristics of diurnal variation ; it is generally larger at 30 m than that of the near-surface altitude of 2 m and its variation at 30 m lags behind that of 2 m by about 6 h. In addition, the correlation is very high and variation trend is generally consistent between the flux at different altitudes and closely related with the variation of visibility during the haze. Low wind speed, high humidity and the vertical diffusion of flux are important factors.
出处
《广东气象》
2017年第6期19-22,共4页
Guangdong Meteorology
关键词
天气学
灰霾
近地层
物理通量
深圳市
synoptics
haze
near-surface level
physical flux
Shenzhen
