![](/images/graphics-bg.png)
A Numerical Study of the Beijing Extreme Rainfall of 21 July 2012 and the Impact of Topography
Joint Authors
Source
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-05-21
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
The extreme rainfall on 21 July 2012 is the heaviest rainfall that has occurred in Beijing since 1961.
Observations and WRF (Weather Research and Forecasting) model are used to study the effect of MCS (mesoscale convective system) and topography on the rainfall.
In this high-impact event, a quasi-stationary MCS developed in a favorable moist environment.
The numerical simulation successfully reproduced the amount, location, and time evolution of the rainfall despite 4–6 h delay.
In particular, the model reproduced the repeat passage of convective cells at the leading convergence line region along Taihang Mountains and the trailing stratiform region, producing the rainfall at nearly the right position.
Results indicate the important roles of mesolow and low-level jet in maintaining the conditional instability that lifted the moist air to trigger deep convection and the repeated initiation and movement of the line shaped convective cells that produced the rainfall.
The sensitive experiment was then further carried out to examine the effect of topography on this heavy rainfall.
The reduction in model elevation field significantly influenced the above mesoscale systems, which lead to convective cells becoming less organized, and the peak rainfall amount in Beijing decreased by roughly 50%.
American Psychological Association (APA)
Xu, Hongxiong& Yao, Wenqing. 2015. A Numerical Study of the Beijing Extreme Rainfall of 21 July 2012 and the Impact of Topography. Advances in Meteorology،Vol. 2015, no. 2015, pp.1-12.
https://search.emarefa.net/detail/BIM-1052867
Modern Language Association (MLA)
Xu, Hongxiong& Yao, Wenqing. A Numerical Study of the Beijing Extreme Rainfall of 21 July 2012 and the Impact of Topography. Advances in Meteorology No. 2015 (2015), pp.1-12.
https://search.emarefa.net/detail/BIM-1052867
American Medical Association (AMA)
Xu, Hongxiong& Yao, Wenqing. A Numerical Study of the Beijing Extreme Rainfall of 21 July 2012 and the Impact of Topography. Advances in Meteorology. 2015. Vol. 2015, no. 2015, pp.1-12.
https://search.emarefa.net/detail/BIM-1052867
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1052867