南京秋季辐射雾与平流雾边界层气象要素特征比较  

Characteristic Comparison of ABL Meteorological Elements in Fall between Radiation Fog and Advection Fog in Nanjing

作　　者：沈澄[1,2] 姜有山 刘冬晴 

机构地区：[1]南京大学大气科学学院,南京210093 [2]南京市气象局,南京210009

出　　处：《气象科技》2013年第3期552-557,共6页Meteorological Science and Technology

摘　　要：利用南京市200m气象铁塔的梯度观测资料、L波段探空雷达以及常规气象资料,对南京地区2010年两次秋季大雾天气过程进行了对比分析。结果表明:①两次大雾天气分别为典型的辐射雾和平流雾。②在两类大雾的发展过程中,对流层低层都存在较厚的逆温层,其中辐射雾存在多层辐射逆温和下沉逆温,而平流雾仅存在一层由暖平流形成的强逆温;边界层内辐射雾的贴地逆温强度明显强于平流雾,另外两次过程中均存在上层逆温。③雾的发展与地面气温的演变均有较好的对应关系:均是在地面气温出现突降、贴地逆温强度突增之后,边界层相对湿度随之显著上升,雾增强发展;辐射雾的雾顶高度远高于平流雾。④边界层风速呈现明显的峰值变化,且这种风速的脉动与雾的发展有一定的对应关系:当各层风速出现陡降后,雾增强发展,而后随着湍流的加强,雾趋于消散。Based on the observational data obtained from the 200 m meteorological tower in the urban area of Nanjing, together with the L-band radar and conventional observational data, a comparative analysis of the boundary layer structures of two fog events in the autumn of 2010 is conducted. The results are： （1） The fog occurred on 17 November was a typical radiation fog, but that on 21 November a typical advection fog. （2） There existed a thick temperature inversion layer for both radiation fog and advection fog at lower levels; during the radiation fog, there was multilayer and subsidence inversion, but during the advection fog, there was single-layer inversion due to warm airflow in the boundary layer. The intensity of temperature version during the radiation fog was stronger than that during advection fog, and there was an upper temperature inversion during the development of both. （3） The development of both fog had a close relation to the evolution of the surface temperature： after the sudden drop of surface temperature and the quick stronger intensity of temperature inversion, the relative humidity of the boundary layer increased more significantly, and the fog got thicker. The height of fog top during radiation fog was much higher than that of advection fog. （4） The wind velocity in the boundary layer displayed a peak-valley variation. There was a certain relationship between wind velocity fluctuation and fog development：when the wind

关 键 词：雾 边界层 逆温 地面气温 

分 类 号：P457[天文地球—大气科学及气象学]