| 中国东部城市群发展对南海夏季风爆发影响的模拟研究 |
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| 引用本文： | 余荣,江志红,马红云.中国东部城市群发展对南海夏季风爆发影响的模拟研究[J].大气科学,2016,40(3):504-514. |
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| 作者姓名： | 余荣 江志红 马红云 |
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| 作者单位： | 南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心, 南京 210044 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)项目2010CB428505,国家自然科学基金重点项目41230528,江苏高校优势学科建设工程资助项目(PAPD),江苏省高校"青蓝工程"创新团队项目共同资助 |
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| 摘 要： | 本文利用NCAR开发的CAM5.1(Community Atmosphere Model Version 5.1)模式,针对我国东部大规模城市下垫面发展对南海夏季风爆发的影响进行了数值模拟研究。结果表明我国东部大规模城市群发展可能使得南海夏季风提前1候爆发;机理分析表明:在南海夏季风爆发之前,中国东部城市群发展引起的陆面增温,使得南海及其附近地区南北温差提前逆转、中国东部区域海平面气压降低,导致中南半岛到南海地区西南气流加强,中南半岛到南海地区降水增加,而凝结潜热垂直变化强迫出的异常环流,促进了南亚高压的加强及提前北跳,相伴随的高层抽吸作用有助于季风对流的建立和西太平洋副高的减弱东撤,从而形成了有利于南海夏季风爆发的高低层环流条件,导致南海夏季风提前爆发。另外,观测结果表明1993年之后南海夏季风爆发的日期相对上一个年代明显提前约2候,城市化快速发展阶段与南海夏季风爆发的年代际变化存在时间段的吻合,表明城市下垫面发展可能是南海夏季风提前爆发的原因之一。
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| 关 键 词： | 城市化 南海夏季风爆发 数值模拟 全型涡度方程 |
| 收稿时间： | 2015/1/21 0:00:00 |
A Numerical Study on the Impact of Urban Land-Use Change over Eastern China on the Onset of the South China Sea Monsoon |
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| YU Rong,JIANG Zhihong and MA Hongyun.A Numerical Study on the Impact of Urban Land-Use Change over Eastern China on the Onset of the South China Sea Monsoon[J].Chinese Journal of Atmospheric Sciences,2016,40(3):504-514. |
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| Authors: | YU Rong JIANG Zhihong and MA Hongyun |
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| Institution: | Key Laboratory of Meteorological Disaster of Ministry of Education(KLME), Joint International Research Laboratory of Climate and Environment Change(ILCEC), Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIL-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044 |
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| Abstract: | The effect of urban land-use change over eastern China on the onset of the South China Sea summer monsoon (SCSSM) is investigated using Community Atmosphere Model Version 5. 1(CAM5. 1). Results show that the seasonal transition characteristics of large-scale atmospheric circulation during the SCSSM onset are reproduced well in CAM5. 1. Comparison of two runs show that urbanization over eastern China may advance the date of SCSSM onset by one pentad. Possible mechanisms are analyzed, revealing that urbanization induces strengthened warming and sensible heating from land to air in the middle to high latitudes over continental eastern China, and the thermal contrast between ocean and land is reduced, causing the advancement of the formation of continental low pressure and leading to the early appearance of zonal wind over the South China Sea. This provides abundant vapor, conducive to precipitation over the South China Sea. The increase in precipitation causes the increase in condensation latent heat release, making the control (CTRL) experiment generate a condensation latent heating center in advance. The related dynamic diagnosis shows that the vertical change in condensation latent heating has an important influence on the vorticity field, causing abnormal circulation that contributes to a northerly jump and strengthening of the South Asian high. This then prompts the western Pacific subtropical high into an eastward withdrawal, and the generation of low-level cyclonic circulation, leading to an advanced SCSSM onset. An earlier SCSSM onset is detected due to the urban land-use change over eastern China, implying that urban land-use change probably plays an important role in the observed earlier SCSSM onset around 1993. |
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| Keywords: | Urban land-use change South China Sea monsoon onset Numerical simulation Complete-form vorticity equation |
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