| 崔强,王春明,张云.干侵入对我国东部一次强飑线过程的作用分析[J].沙漠与绿洲气象,2016,10(2):18~24 |
| 干侵入对我国东部一次强飑线过程的作用分析 |
| Analysis of Impact of Dry Intrusion on a Strong Squall Line Process in Eastern China |
| 投稿时间：2015-07-15 修订日期：2015-10-13 |
| DOI： |
| 中文关键词: 飑线 干侵入 水汽图像 结构特征 作用机制 |
| 英文关键词:squall line dry intrusion water vapor images structural feature mechanism |
| 基金项目: |
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| 摘要点击次数: 1276 |
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| 中文摘要: |
| 利用NCEP/NCAR再分析资料、雷达资料、FY2E卫星资料等，对2014年7月30日至31日发生在我国东部的一次强飑线天气过程进行综合分析，并着重分析了干侵入对此次飑线过程的作用。结果表明：中层阶梯槽引导高层干冷空气向下入侵后叠加在低层暖湿气流之上，增强了大气不稳定，不稳定能量累积；低空切变线促使不稳定能量释放，是此次飑线的重要触发机制。对干侵入的分析结果表明：此次飑线过程中，干侵入来源于高空槽后下沉气流，干侵入底部风场调整使得飑线在移动过程中发生了转向。在飑线发展过程中，干侵入范围扩大、强度增强；干侵入使飑线发生区域上空空气变冷、变干，增强了大气不稳定。干侵入底部的低相当位温空气与飑线内部高相当位温空气混合是飑线长时间维持的重要原因。 |
| 英文摘要: |
| Using the NCEP/NCAR reanalysis data, radar and satellite data, etc., analyzed the synoptic characters of a strong squall line process in eastern China during 30~31 July, 2014. The mechanism of dry intrusion in this process were also revealed. The results indicate that: the mid-level stepped trough guided dry-cold air from the high-level superimposed on the low-level warm air, the atmospheric instability enhanced and unstable energy accumulated; low level shear line prompted unstable energy released, it was an important trigger mechanism for the squall line. The analysis results of dry intrusion show that: in this squall line process, dry intrusion originated from downdraft behind the high-level trough, wind adjustment at the bottom of dry intrusion urged the squall line to change the moving direction. Dry intrusion was expanded and strengthened during the development of squall line; Dry intrusion made air over the squall line came colder and dryer, increased atmospheric instability. Low equivalent temperature air under dry intrusion mixed with high equivalent temperature air inside the squall line, it is the important reason for squall line to maintain for a long time. |
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