中山大学学报（自然科学版）（中英文）2022，Vol.61Issue(3)：62-75,14.DOI:10.13471/j.cnki.acta.snus.2021D012
华南珠三角地区海岸线和地形对暖区暴雨的影响
Effects of coastline and terrain on warm-sector heavy rainfall in the Pearl River Delta, South China
摘要
Abstract
We conducted three experiments using the WRF-Chem model to examine the physical ef-fects 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Key words
warm-sector heavy rainfall/coastline/terrain/WRF-Chem model/the Pearl River Delta area分类
天文与地球科学引用本文复制引用
陈子健,林文实,蒋宝林,曹琪敏,沈晓钿..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）（中英文）,2022,61(3):62-75,14.基金项目
国家重点研发计划项目(2018YFC1507402) （2018YFC1507402）
国家自然科学基金(41875168) （41875168）
广东省气候变化与自然灾害研究重点实验室基金(2020B1212060025) （2020B1212060025）
