Effects of quasi-stationary large-scale anomalies on some mesoscale features associated with the 1993 flood: A regional model simulation

Zaitao Pan*, Raymond W. Arritt, Moti Segal, Tsing Chang Chen, Shu Ping Weng

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

7 引文 斯高帕斯(Scopus)

摘要

We investigate the effect of quasi-stationary large-scale anomalies on mesoscale factors contributing to the 1993 U.S. Midwest flood by performing 30-day simulations with a mesoscale model. The contributions of anomalous mesoscale features to the flood were quantified by contrasting model integrations forced by initial and lateral boundary conditions with and without large-scale anomalous stationary waves that are believed to have been responsible for the flood. Supplementing previous investigations, the present study finds the following: (1) The large-scale anomalies produced environmental conditions that favored a generation of MCC-like systems rather than individual convective cells or squall lines that would have produced less precipitation over large areas. Ambient conditions favoring mesoscale convective complex (MCC) include an intensified east-west orientation of quasi-stationary fronts, weaker upper tropospheric inertial stability, and a strong low-level jet (LLJ). (2) The anomalous ageostrophic wind component to the far south of the flood region (Texas area) and geostrophic wind component over the flood region bridged together to form an extended moisture conveyer that sustained the long-lasting 1993 flood.

原文英語
文章編號2000JD900429
頁(從 - 到)29551-29564
頁數14
期刊Journal of Geophysical Research Atmospheres
105
發行號D24
DOIs
出版狀態已發佈 - 2000 十二月 27
對外發佈

ASJC Scopus subject areas

  • 地球物理
  • 森林科學
  • 海洋學
  • 海洋科學
  • 生態學
  • 水科學與技術
  • 土壤科學
  • 地球化學與岩石學
  • 地表過程
  • 大氣科學
  • 地球與行星科學(雜項)
  • 空間與行星科學
  • 古生物學

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