一次强寒潮过后青岛地区气温迅速回升的成因研究.docVIP

一次强寒潮过后青岛地区气温迅速回升的成因研究 Study on Mechanism of Rapid Air Temperature Increase after a Strong Cold Wave Moved out of Qingdao Area 完成日期： 指导教师签字： 答辩小组成员签字： 一次强寒潮过后青岛地区气温迅速回升的成因研究 摘 要 利用台站观测数据与FNL再分析数据，对2008年12月5日～7日的一次强寒潮过后青岛地区气温迅速回升的原因进行了探究。通过分析风场、气压场、热通量等物理量的时空分布以及运用WRF模式进行数值模拟，详细研究了气温迅速回升的原因。结果表明：（1）在造成寒潮天气过程的大槽移过青岛地区之后，6日20时，在该大槽之后逐渐形成一短波小槽，槽后存在冷平流，使其有所加深且保持稳定，位于小槽前面的青岛地区受槽前西南气流的影响，一直处于暖平流作用下，气温迅速回升。（2）运用WRF模式的数值模拟对影响青岛地区的暖气团进行后向轨迹追踪分析，发现该暖气团来自于青岛西南部的我国内陆地区。（3）进一步的卫星云图与台站观测分析得出，该暖空气移动过程中所经过的附近代表性站点6日至7日，天气均表现为晴朗无云，气温均存在显著回升的现象。 关键词：寒潮，迅速回温，暖平流，WRF，数值模拟，后向轨迹分析 Study on the Mechanism of Air Temperature Rapidly Increased after a Strong Cold Wave Moved over Qingdao Area Abstract Using FNL reanalysis data and station observation data ，the reason that air temperature increased rapidly after a strong cold wave moved out of Qingdao area from 5th to 7th Dec 2008 is investigated. Through analyzing of spatial-temporal changes of wind, pressure and heat flux fields, as well as using numerical simulation by the WRF model，this reason is carefully studied. The results show that the reason can be as follows. (1) Behind the strong trough which resulted in the cold wave, there existed a short-wave trough which generated at about 12:00 UTC of Dec 6th. At 850hPa level, this trough got strengthen because of cold advection at its back. Meanwhile at front of this trough, southwesterly airflow transported warm air to northeastern area. As the result of positive value of net heat flux over Qingdao area, the ai