福建沿海区域大气稳定度分类方法对比研究

Comparison of classification methods on atmospheric stability over the coastal areas of Fujian province

利用福建沿海某个厂址所建的100 m气象铁塔观测数据,采用2018年1月1日至2018年12月31日塔层所获取的风向、风速、温度的观测资料以及地面站太阳辐射表观测的总辐射值和净辐射值,用太阳辐射法、温度梯度法、温度梯度—风速法、理查逊数法计算大气的稳定度。从观测区域各类稳定度结果四季的分布、各类稳定度频率的日变化和不同来流情况下各类稳定度的分布三个方面,分析了这四种方法在该地区稳定度分类结果的不同。鉴于该区域日间辐射强、低层风速值较小的特点,四种分类方法中以温度梯度—风速法和理查逊数法对本区域大气稳定度的划分适用性比较好。

Meteorological data were obtained by a 100-meter observation tower built in a plant site along with the coastal areas of Fujian province.Using observation data from the tower including wind direction,wind speed,and temperature,along with the total radiation and net radiation from ground observation,atmospheric stability was investigated via solar radiation method,temperature gradient method,temperature gradient-wind speed method,and Richardson number method.The differences in atmospheric stability classification results using the four methods were evaluated considering seasonal variations of stability,diurnal variation for each stability frequency,and stability in various incoming flows.Due to the significant radiation and low wind speed at near-surface levels,the temperature gradient method and Richardson number method appeared more suitable for the atmospheric stability classification in the coastal areas of Fujian province.