Plateau Meteorology

Plateau Meteorology >

2017 , Vol. 36 >Issue 3: 705 - 717

DOI: https://doi.org/10.7522/j.issn.1000-0534.2016.00056

Numerical Simulation of the Impacts of the Sea-Breeze and the Urban Heat Island on the Severe Convective Event in Shanghai

  • ZHANG Yuncheng ,
  • WANG Xiaofeng ,
  • ZHANG Lei ,
  • SHU Jiong
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  • The Key laboratory of Geographic Information Science, Ministry of Education, East China Normal University, shanghai 200241, China;Shanghai Institute of Meteorological Science, Shanghai 200030, China;Key Laboratory of Numerical Modeling for Tropical Cyclone, China Meteorological Administration, Shanghai 200030, China

Received date: 2016-02-25

  Online published: 2017-06-28

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Abstract

A new-generation Weather research and Forecasting (WRF) model, which coupled with a multi-layer urban canopy model (BEP+BEM), was used to simulate an early-afternoon severe convection that occurred in Shanghai on 13 September 2013. Using the daily global forecasting dataset with 0. 25°×0. 25° resolution from the National Centers for Environment Predication Global Forecast System (NCEP GFS) as the initial field and boundary conditions, two numerical experiments were conducted. The impact of urbanization on this precipitation process was explored by comparing the results from the case (Ctrl) of coupling with the urban canopy module with those from the case (Crop) of replacing city as farmland. The results showed that:(1) The occurrence of precipitation was mainly affected by the large-scale weather system, but the urbanization also played an important role in modulating the local-scale precipitation; (2) With the effect of the urban heat island, the temperature increased and the pressure decreased in urban region, which enhanced the sea breeze and the updraft in urban area. And as a result, it finally influenced the distribution and intensity of the local-scale precipitation; (3) The effect of urban heat island made the precipitation occur earlier and made the distribution of precipitation more concentrating.

Key words： Urban heat island; Severe convection; Sea-land breeze; Underlying surface f

Cite this article

ZHANG Yuncheng , WANG Xiaofeng , ZHANG Lei , SHU Jiong . Numerical Simulation of the Impacts of the Sea-Breeze and the Urban Heat Island on the Severe Convective Event in Shanghai[J]. Plateau Meteorology, 2017 , 36(3) : 705 -717 . DOI: 10.7522/j.issn.1000-0534.2016.00056

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