渤海西岸一次極端大風的特征和成因分析
作者:
作者單位:

作者簡介:

通訊作者:

中圖分類號:

基金項目:

國家重點研發計劃重點專項(2019YFC1510100)、環渤海區域科技協同創新基金項目(QYXM202210)及中國氣象局預報復盤總結專項(FPZJ2023008)資助


Characteristics and Causal Analysis of an Extreme Gale on West Coast of Bohai Sea
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 圖/表
  • |
  • 訪問統計
  • |
  • 參考文獻
  • |
  • 相似文獻
  • |
  • 引證文獻
  • |
  • 資源附件
  • |
  • 文章評論
    摘要:

    利用NCEP-FNL資料、FY-4衛星紅外云圖資料、雷達資料和自動站資料,對2021年4月15日渤海西岸由大尺度冷空氣和中尺度對流系統共同作用形成的極端大風進行特征和成因分析。結果表明:①FY-4衛星紅外云圖云頂亮溫表現出指狀特征,雷達反射率因子表現為兩個弱回波帶在渤海西岸合并加強為一條帶狀回波,隨著系統東移由帶狀回波演變為弓狀回波。②上冷下暖的不穩定層結為鋒面觸發對流提供有利環境條件,在徑向速度圖上出現較大范圍速度模糊和中層徑向輻合。③此次大風過程具有雷暴大風和冷空氣大風混合的大風特征,大風成因是由大尺度冷空氣產生的動量下傳、大尺度變壓風、梯度風以及中尺度雷暴冷池出流共同導致的。

    Abstract:

    The observed process constitutes a combination of systemic cold air gale and thunderstorm gale. The convective system is induced and moves along with the front, resulting in sudden and extreme gale conditions akin to thunderstorm gales. Upon transitioning, the convective system mirrors the persistent traits of a systemic cold air gale. This study uses NCEP-FNL data, FY-4 satellite infrared cloud data, radar data, wind profile data, and automatic weather station data to investigate the characteristics and causes of the extreme gales. The principal findings are as follows: (1) The eastward progression of high trough at 500 hPa and low vortex at 850 hPa established a widened warm region at 850 hPa, as well as an unstable stratified complex along the west coast of the Bohai Sea. The transition of the front triggered convection, leading to extreme windy weather along the west coast. The reflectivity factor revealed that two bands of weak echoes along the west coast of the Bohai Sea were converging and intensifying into a single band, which then developed from a band to a bow echo with a gap in the front, as the system moved eastward. Notably, substantial velocity blurring and mid-level radial convergence emerged from the velocity diagram. (2) The gale event occurred in early spring when shortterm forecasts did not accommodate convective weather, accounting only for the manifestation of frontal precipitation and cold air gales. Prior to the emergence of convection, cold advection at 500 hPa and pronounced warm advection at 700-925 hPa were present over the west coast of the Bohai Sea. The unstable stratum between the upper-level cold and lower-level warm layers furnished favourable environmental conditions for the frontal transition to induce convection. In this context, the CAPE and DCAPE values derived from the NCEP forecast model served as a reference for thunderstorm and gale forecasting. (3) The gale progression was influenced by the downward momentum transfer of large-scale cold air, variable pressure winds, gradient winds induced by large-scale cold air, and the effects of mesoscale thunderstorm cold pool outflow invoked by convective systems. The systemic cold air gales, propagated due to the downward momentum transfer of largescale cold air, variable pressure winds and gradient winds, exerted an augmenting impact on the mesoscale thunderstorm outflow.

    參考文獻
    相似文獻
    引證文獻
引用本文

朱男男,趙玉娟,王彥,孫曉磊,胡田田,左濤,劉一瑋.渤海西岸一次極端大風的特征和成因分析[J].氣象科技,2023,51(6):858~866

復制
分享
文章指標
  • 點擊次數:
  • 下載次數:
  • HTML閱讀次數:
  • 引用次數:
歷史
  • 收稿日期:2022-08-30
  • 定稿日期:2023-06-25
  • 錄用日期:
  • 在線發布日期: 2023-12-28
  • 出版日期:
您是第位訪問者
技術支持:北京勤云科技發展有限公司
午夜欧美大片免费观看,欧美激情综合五月色丁香,亚洲日本在线视频观看,午夜精品福利在线
>