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利用常规探测资料、NCEP/NCAR再分析资料和FNL1°×1°格点资料,对2015年12月26日凌晨宁波机场发生的一次大雾过程进行综合分析。结果表明:前期的雨雾和高空西南急流的输送为此次大雾过程提供了充沛的水汽,而中低层槽后西北气流和地面的弱高压控制则提供了有利的天气背景条件;温度露点差(T-T_d)对湿度的衡量有一定的指示意义;中高层冷平流的控制,致使宁波机场天况转好,地面辐射冷却作用有利于大雾的形成;近地面层的负涡度和中高层的正涡度,这种垂直配置能确保大气低层的湿空气不外流。
Based on the conventional exploration data, NCEP / NCAR reanalysis data and the FNL1 ° × 1 ° grid data, a comprehensive analysis of a heavy fog process at the Ningbo Airport on the early morning of December 26, 2015 was conducted. The results show that the pre-rain and high-altitude southwest rapids transport provide abundant water vapor for the fog process, while the northwest airflow after the middle and low troughs and the weak and high pressure control on the ground provide favorable weather conditions. The temperature dew point difference T-T_d) is a measure of humidity. The control of cold-flow at mid-high level led to better weather conditions at Ningbo Airport and the radiation cooling effect on the ground was conducive to the formation of heavy fog. The negative vorticity of the near- Of the positive vorticity, this vertical configuration to ensure that the lower atmosphere of the wet air does not flow.