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刘振元,张杰,陈立.青藏高原植被退化对高原及周边地区大气环流的影响.生态学报,2018,38(1):132~142 本文二维码信息
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青藏高原植被退化对高原及周边地区大气环流的影响
Effects of vegetation degradation on atmospheric circulation over the Tibetan Plateau and its surrounding areas
投稿时间:2014-12-22  
DOI: 10.5846/stxb201412222548
关键词植被退化  青藏高原  CAM5.1模式  大气环流
Key Wordsvegetation degradation  Tibetan Plateau  CAM5.1  atmospheric circulation
基金项目国家自然科学基金重点项目(41630426);青藏高原重大计划项目(91437107);江苏高校"青蓝工程";江苏高校优势学科建设工程资助项目
作者单位E-mail
刘振元 南京信息工程大学气象灾害预报预警与评估协同创新中心/气象灾害省部共建教育部重点实验室, 南京 210044
天津市蓟州区气象局, 天津 300074 
 
张杰 南京信息工程大学气象灾害预报预警与评估协同创新中心/气象灾害省部共建教育部重点实验室, 南京 210044 gs-zhangjie@163.com 
陈立 福建省气候中心, 福州 350001  
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摘要:
利用耦合了陆面模式的大气环流模式,结合青藏高原植被退化的范围和程度,通过在模式中修改高原地区(27°-40°N,75°-100°E)的叶面积指数的方法,探讨了植被退化以后对高原及其附近地区上空大气环流的影响。结果表明,该模式对高原地表温度场具有很强的模拟能力,并且能够很好地模拟出青藏高原及附近地区夏季位势高度场的平均特征及南亚高压的位置和强度,但南亚高压中心强度偏大且略微西退。在青藏高原植被出现退化以后,高原整体地表土壤温度和地表2 m空气温度升高,感热通量增加、潜热通量减小,进而改变了高原地区的波文比。地表感热增加导致高原及附近地区500 hPa高度场降低和200 hPa高度场升高,并在200 hPa上存在强大的反气旋性环流异常,导致南亚高压增强和北扩东伸。植被退化造成的青藏高原感热增加导致了高原南部上升运动增强和北部上升运动减弱,同时又引起高原以北地区下沉气流的影响范围扩大,而下沉气流的强度减弱,其结果有助于高原以北的干旱范围扩大,而干旱程度却得到缓解。
Abstract:
Using the Community Atmosphere Model coupling with Common land model, combined with the scope and intensity of vegetation degradation in the Tibetan Plateau, the simulations on vegetation degradation is performed by changing leaf area index in the Tibetan Plateau (27°-40°N, 75°-100°E). We discuss effects of vegetation degradation in Tibetan plateau on atmospheric circulation over the Tibetan Plateau and adjacent areas. The results show that the model can well simulate the averaged characteristics in summer geopotential heights and South Asia high position and strength, and it also has a strong ability to simulate the surface temperature field in the Tibetan Plateau, however, the center of South Asia high is too large and slightly West back. After the vegetation degradation in the Tibetan Plateau, the soil temperature and 2 m air temperature rises, surface sensible heat flux increases, however, surface latent heat flux decreases, both of which changes Bowen ratio in Tibetan Plateau. Increase of the surface sensible heat flux leads to the decrease of the 500 hPa height and increase of the 200 hPa height, which results in strong anticyclonic anomalies over 200 hPa, that makes strong South Asia high and expansion to the north and the east. The increase of surface sensible heat flux due to vegetation degradation can lead to enhanced ascending motion over southern Plateau and weakened descending motion over northern Plateau, and the ranges of descending motion exhibits northward expansion over outside of the Tibetan Plateau with weakening intensity, it finally contributes to the expansion of drying climate but with weakening drought.
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