Effects of coastline and terrain on warm-sector heavy rainfall in the Pearl River Delta, South China

CHEN Zijian; LIN Wenshi; JIANG Baolin; CAO Qimin; SHEN Xiaodian

doi:10.13471/j.cnki.acta.snus.2021D012

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Effects of coastline and terrain on warm-sector heavy rainfall in the Pearl River Delta, South China

Research articles | 更新时间：2023-11-01

- Effects of coastline and terrain on warm-sector heavy rainfall in the Pearl River Delta, South China
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 61, Issue 3, Pages: 62-75(2022)
- 作者机构：
  
  1.南方海洋科学与工程广东省实验室（珠海），广东珠海 519082
  2.中山大学大气科学学院/广东省气候变化与自然灾害研究重点实验室，广东珠海 519082
  3.惠州学院地理与旅游学院，广东惠州 516007
- 作者简介：
- 基金信息：
  
  广东省气候变化与自然灾害研究重点实验室项目(2020B1212060025)
- DOI：10.13471/j.cnki.acta.snus.2021D012
  CLC： P445
- Published：25 May 2022，
  
  Published Online：16 July 2021，
  
  Received：26 February 2021，
  
  Accepted：11 March 2021
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陈子健,林文实,蒋宝林等.华南珠三角地区海岸线和地形对暖区暴雨的影响[J].中山大学学报(自然科学版),2022,61(03):62-75.

CHEN Zijian,LIN Wenshi,JIANG Baolin,et al.Effects of coastline and terrain on warm-sector heavy rainfall in the Pearl River Delta, South China[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(03):62-75.
陈子健,林文实,蒋宝林等.华南珠三角地区海岸线和地形对暖区暴雨的影响[J].中山大学学报(自然科学版),2022,61(03):62-75. DOI： 10.13471/j.cnki.acta.snus.2021D012.

CHEN Zijian,LIN Wenshi,JIANG Baolin,et al.Effects of coastline and terrain on warm-sector heavy rainfall in the Pearl River Delta, South China[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(03):62-75. DOI： 10.13471/j.cnki.acta.snus.2021D012.

摘要

通过使用WRF-Chem模式进行3个敏感性试验，研究东亚夏季风背景下，华南珠三角地区复杂的海岸线和沿岸众多低矮的山脉地形与暖区暴雨强度和分布之间的物理关联。通过动力以及水汽输送分析，发现当珠三角地区的低矮山脉地形移除后，山脉群对气流的地形抬升以及辐合作用消失，海岸线上的对流活动明显减少，925 hPa上水汽在海岸线上的积累减少，降雨区域向北移动约80 km，降水强度也减弱；当沿岸山脉地形移除，海岸线北移，喇叭口特殊地形消失后，原来海岸线上的海陆摩擦力差异消失，气流的辐合对流运动大幅减少，珠三角区域内几乎没有降水，取而代之的是在新的海岸线沿岸附近由于地形抬升作用以及下垫面摩檫力的差异，出现新的对流活动以及水汽的堆积，并且新海岸线上出现新的降水中心。因此珠三角区域内海岸线以及海岸山地是影响降水强度、分布和发生发展的重要因素。

Abstract

We conducted three experiments using the WRF-Chem model to examine the physical effects of the coastline and numerous low mountains along the coast in the Pearl River Delta (PRD) area on the intensity and distribution of warm-sector heavy rainfall. We analyzed dynamic effects and water vapor transport

and found that by replacing the mountains in the PRD with flat land

orographic lifting disappears

resulting in a considerable reduction of coastal convergence and water vapor accumulation at 925 hPa along the coastline;the 12 hours accumulated precipitation area is mainly confined to the north of 22.7°N which is 80 km north than without moving out the mountains

and precipitation intensity decreases. By shifting the coastline northward and thus

removing the special topography of the low mountains and the contrast of frictional forces along the original coastline

the convection caused by the convergence is greatly reduced. As a result

almost no precipitation falls in the PRD region. Instead

convection

water vapor accumulation and precipitation centers appear near the new coastline because of orographic lifting and discontinuities in surface friction. The coastline and coastal mountains of the PRD play important roles in the occurrence

intensity and distribution of precipitation.

关键词

暖区暴雨海岸线地形WRF-Chem模式珠三角地区

Keywords

warm-sector heavy rainfallcoastlineterrainWRF-Chem modelthe Pearl River Delta area

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