乌鲁木齐机场2021年7月30~31日降水天气过程特征分析

Analysis on the Characteristics of Precipitation Weather Process in Urumqi Airport during July 30~31, 2021

摘要: 利用ERA5再分析资料、乌鲁木齐机场微波辐射计资料、机场报文分析2021年7月30日~31日乌鲁木齐机场降雨天气形势。结果表明：1) 此次降水天气受乌拉尔山大槽东移南下影响产生，槽后北风带强，持续有冷空气补充；槽前西南气流强盛，为降水提供充足的水汽；高空槽移动速度缓慢，为新疆地区带来了较长时间的持续降雨。2) 低层辐合上升、中层辐散下沉的配置为降水提供了动力条件；相对湿度大值区持续时间长，为机场持续性降水提供了良好的水汽条件。3) 微波辐射计可以较好的展现机场上空垂直方向上水汽的时间变化特征。

Abstract: The rain weather situation of Urumqi Airport from July 30 to 31, 2021 was analyzed by using ERA5 reanalysis data, microwave radiometer data of Urumqi Airport and airport messages. The results show that: 1) the precipitation was influenced by the eastward and southward movement of the Great Ural Trough, and the north wind belt behind the trough was strong and cold air continued to supplement. The southwest airflow in front of the trough is strong, which provides sufficient water vapor for precipitation. The trough moved slowly, bringing a long period of continuous rainfall to Xinjiang. 2) The configuration of convergence rising in low layer and divergence sinking in middle layer provided dynamic conditions for precipitation. The relative humidity high value area lasts for a long time, which provides good water vapor conditions for the continuous precipitation at the airport. 3) The microwave radiometer can better display the temporal variation characteristics of water vapor in the vertical direction over the airport.