海南岛沿海城镇化对海风锋推进影响的数值模拟  

Numerical simulation of the impact of coastal urbanization on sea breeze front penetration over the Hainan Island

作　　者：段懿轩 苗峻峰[1,4] 冯文 Duan Yixuan;Miao Junfeng;Feng Wen(School of Atmospheric Sciences,Nanjing University of Information Science and Technology,Nanjing 210044,China;Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province,Haikou 570203,China;Hainan Provincial Meteorological Observatory,Haikou 570311,China;School of Ecology and Environmental Science,Qinghai Institute of Technology,Xin-ing 810016,China)

机构地区：[1]南京信息工程大学大气科学学院,江苏南京210044 [2]海南省南海气象防灾减灾重点实验室,海南海口570203 [3]海南省气象台,海南海口570311 [4]青海理工学院生态与环境科学学院,青海西宁810016

出　　处：《海洋学报》2024年第6期66-83,共18页

基　　金：海南省南海气象防灾减灾重点实验室开放基金(SCSF202305);海南省自然科学基金高层次人才项目(422RC803)。

摘　　要：本文利用中尺度模式WRF-ARW(Weather Research and Forecasting Model-Advanced Research WRF)(Version 4.0)对海南岛不同天气条件下的典型海风锋个例进行了高分辨率数值模拟,通过设计局地城镇化的敏感性试验,重点分析了海南岛沿海城镇化对海风锋推进的影响及其可能机制。研究结果表明:海南岛沿海城镇化造成的海风锋结构差异是热力作用和动力作用共同影响的结果;城镇下垫面的摩擦效应与城市热岛的增强阻碍海风向内陆推进,减弱了海风锋途经地区的降温增湿效应,造成海风锋位置相对滞后;而城镇化所引起的高海陆热力差异增强了海风风速及海风辐合,同时导致海风锋前的垂直上升气流和海风环流厚度也明显增强。海风锋发展不同时期,城镇化对海风锋的推进影响有所不同。海风锋发展初期,海陆热力差异引起的推动作用与摩擦效应的阻碍作用相抵消,导致海风锋的推进无明显影响;海风锋发展强盛阶段,城镇化条件下内陆城市与非城市之间的热力差异有所增强,阻碍了海风锋向内陆推进,导致海风锋内陆渗透距离减小。不同天气条件下城市化对海风锋推进的影响有所不同,相比于晴空天气,多云天气下城市与非城市的热力差异稍强,加强了城市热岛效应对海风推进的阻碍作用,导致海风锋滞后距离稍远。此外,当土地利用类型更换为城镇后,净辐射与陆气间交换能量减少,导致其潜热通量显著减小,感热通量值变大,从而升高了下垫面温度,增强了海风的垂直上升运动,进而造成边界层高度的升高。In this paper,the mesoscale model WRF-ARW(Weather Research and Forecasting Model-Advanced Re-search WRF)(Version 4.0)is used to simulate a typical sea breeze front case in Hainan Island under different weath-er conditions with high numerical resolution.By designing sensitivity tests for local urbanization,the influence of coastal urbanization on sea breeze fronts in Hainan Island and its possible influencing mechanism are analyzed.The results show that the sea breeze front structure difference caused by urbanization is the result of thermal and dynam-ic effects.The friction effect of the underlying surface and the enhancement of urban heat island hinder the sea breeze from advancing inland,weaken the cooling and humidification effect of the sea breeze front,and result in a relative lagging of the sea breeze front.The high sea-land thermal difference caused by urbanization enhances the sea breeze wind speed and amplitude,and the vertical updraft and sea breeze circulation thickness in front of the sea breeze front are significantly enhanced.The influence of urbanization on the advance of sea breeze fronts varies during different stages of development.In the early stages of the development of sea breeze fronts,the driving ef-fect of the thermal difference between land and sea is offset by the hindering effect of friction,resulting in no signi-ficant impact on the advance of sea breeze fronts.In the strong stage of development of sea breeze fronts,the thermal difference between inland cities and non-urban areas under urbanization conditions has increased,hinder-ing the advance of sea breeze fronts towards inland areas,resulting in a decrease in the penetration distance of sea breeze fronts inland.The influence of urbanization on the advance of sea breeze fronts varies under different weath-er conditions.Compared to clear weather,the thermal difference between urban and non-urban areas under cloudy weather is slightly stronger,strengthening the hindering effect of urban heat island effect on the advance of sea breeze

关 键 词：海风锋 城镇化 土地覆盖变化 复杂地形 热带海岛 

分 类 号：P714.2[天文地球—海洋科学]