Numerical Investigation and Uncertainty Analysis of Eastern China’s Large-Scale Urbanization Effect on Regional Climate
Numerical Investigation and Uncertainty Analysis of Eastern China’s Large-Scale Urbanization Effect on Regional Climate
复制标题
中国东部大规模城镇化对区域气候影响的数值调查与不确定性分析
DOI：
10.1007/s13351-021-1033-y
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发表时间：
2021
影响因子：
3.2
通讯作者：
Liu, Ye
中科院分区：
文献类型：
--
作者：
Quan, Jiping;Xue, Yongkang;Duan, Qingyun;Liu, Zhenxin;Oleson, Keith W.;Liu, Ye
近40年来，中国东部经历了快速的城市化进程，有必要了解城市化对区域气候的影响。在东亚夏季风期间，区域气候模式（RCMs）或环流模式的模拟结果显示城市化对降水的影响不一致且统计上不显著。在rcm研究中，再分析数据被用作城市和非城市实验的横向边界条件（lbc）。由于相同的LBCs可能会限制城市化效应，本研究采用全球预报系统（GFS）内嵌套的WRF （Weather Research and Forecasting， WRF）模式与城市冠层模型相结合，对中国东部地区的城市化效应进行了研究。有/没有城市化的WRF的lbc由相应的有/没有城市化的GFS提供。结果表明：与城市化试验相比，华北地区降水明显减少，主要是由于中高层大气潜热减少导致的蒸发和辐散明显减少。与此同时，在大规模城市化地区的北部和南部，特别是长江以南，由于大规模城市化引起的环流变化，降水显著增加。在有/没有城市化的情况下，相同的lbc，城市化的影响仅限于城市和附近地区；长江以南地区变化不明显，主要是由于相同的低通量区域阻碍了城市化对大尺度环流的影响。此外，研究还表明，城市比例可能是影响城市区域内城市化效应强度的关键因素。
Eastern China has experienced rapid urbanization during the past four decades, and it is necessary to understand the impacts of the urbanization on the regional climate. Previous simulations with either regional climate models (RCMs) or general circulation models have produced inconsistent and statistically non-significant urbanization effects on precipitation during the East Asian summer monsoon. In the studies with RCMs, reanalysis data were used as the lateral boundary conditions (LBCs) for both urban and non-urban experiments. Since the same LBCs may limit the urbanization effect, in this study, the Weather Research and Forecasting (WRF) model nested within the Global Forecast System (GFS), both of which were coupled with an urban canopy model, were used to explore the urbanization effect over eastern China. The WRF’s LBCs in the runs with/without urbanization were provided by the corresponding GFS runs with/without urbanization. The results showed a significant decrease in precipitation over North China, mainly due to a marked decrease in evaporation and the divergence induced by the reduced latent heating in the mid and upper atmosphere, from the experiment with urbanization. Meanwhile, to the north and south of the large-scale urbanization areas, especially to the south of the Yangtze River, precipitation increased significantly due to large-scale urbanization-induced circulation change. With the same LBCs for the WRF runs with/without urbanization, the urbanization effects were limited only to urban and nearby areas; no significant change was found to the south of the Yangtze River, since the same LBCs hampered the effects of urbanization on large-scale circulation. In addition, this study demonstrated that the urban fraction may be a key factor that affects the intensity of the urbanization effect within the urban areas.
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DOI：
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发表时间：
2009
期刊：
影响因子：
--
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DOI：
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1990
期刊：
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DOI：
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发表时间：
2007
期刊：
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DOI：
--
发表时间：
2013
期刊：
影响因子：
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