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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Impact of Surface Roughness Changes on Surface Wind Speed Over Western Europe: A Study With the Regional Climate Model RACMO
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Impact of Surface Roughness Changes on Surface Wind Speed Over Western Europe: A Study With the Regional Climate Model RACMO

机译:Impact of Surface Roughness Changes on Surface Wind Speed Over Western Europe: A Study With the Regional Climate Model RACMO

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摘要

Abstract The temporal trend of wind speed near the surface over land has been investigated over recent decades. A prevailing trend of decline was found in several studies for most areas in the Northern hemisphere, denoted as terrestrial stilling, with multiple causes being discussed. In this study, we focus on the impact of changes of surface roughness due to changes in land‐use and vegetation cover on this variable for western Europe using the regional climate model RACMO driven by ERA5 reanalysis. We conduct two simulations at climate scale, with and without changes in land‐use and vegetation on a yearly basis. We find that upper level large‐scale circulation slowing down results in declining near surface mean wind speed, and that increases in surface roughness due to changes in land use and vegetation cover play an important role in intensifying this declining trend from our simulations with RACMO. However, the trends inferred from the model simulations and ERA5 are not consistent with trends derived from gridded observations database E‐OBS. This could come from the complexity of integrating in‐situ measurements with uncorrectable inhomogeneity to derive E‐OBS.
机译:文摘附近风速的时间趋势表面超过土地被调查最近几十年。在几项研究发现的大部分地区北半球,表示为陆地静,由多种原因导致的被讨论。在这项研究中,我们关注变化的影响表面粗糙度变化引起土地的使用和植被为西方在这个变量欧洲使用RACMO区域气候模型由ERA5再分析。模拟气候规模,有或没有土地的使用和植被的变化每年的基础上。循环减慢导致下降近地表平均风速,增加在表面粗糙度由于土地利用格局的改变和植被中扮演重要角色从我们这下降趋势加剧与RACMO模拟。从模型模拟和ERA5推断不一致的趋势来自网格观测数据库E奥林匹克广播服务公司。集成的复杂性在原地测量与不能修复的不均匀性推导出E奥林匹克广播服务公司。

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