气候变化领域集成服务门户(CCPortal): Land Cover Impacts on Land-Atmosphere Coupling Strength in Climate Simulations With WRF Over Europe

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DOI	10.1029/2019JD031989
	Land Cover Impacts on Land-Atmosphere Coupling Strength in Climate Simulations With WRF Over Europe
	Jach L.; Warrach-Sagi K.; Ingwersen J.; Kaas E.; Wulfmeyer V.
发表日期	2020
ISSN	2169897X
卷号	125 期号:18
英文摘要	Land use and land cover changes are important human forcings to the Earth's climate. This study examines the land-atmosphere coupling strength and the relationship between surface fluxes and clouds and precipitation for three land cover scenarios in the European summer. The WRF model was used to simulate one scenario with extreme afforestation, one with extreme deforestation, and one with realistic land cover for the time period between 1986 and 2015. The simulations were forced with ERA-Interim reanalysis data. The analysis followed a two-step approach. First, the convective triggering potential–low-level humidity index framework was applied to locate potential coupling hot spots, which were then analyzed with regard to their sensitivity toward land use and land cover changes. Second, actual feedbacks between evaporative fraction, cloud cover, and precipitation were analyzed statistically with focus on sign and location of the feedbacks. The results demonstrate that coupling hot spots, exhibiting predominantly positive feedbacks, were identified over parts of Eastern Europe and Scandinavia. In this strongly coupled region, afforestation and deforestation modified the atmospheric humidity and stability by changing the surface flux partitioning. Afforestation is associated with a net drying of the atmosphere due to a disproportionately strong increase in the sensible heat flux. In contrast, deforestation initiated a moistening of the atmosphere. The total precipitation changed only in limited areas significantly, which are mostly located in mountainous regions and the northeast of the domain. In summary, the results indicate a land surface influence on the atmospheric background conditions, and an impact on the potential strength of land surface-precipitation feedbacks. ©2020 The Authors.
英文关键词	land use and land cover change; land-atmosphere coupling strength; land-atmosphere feedbacks
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185759
作者单位	Institute for Physics and Meteorology, University of Hohenheim, Stuttgart, Germany; Institute for Soil Science and Land Evaluation, Department of Biogeophysics, University of Hohenheim, Stuttgart, Germany; Niels Bohr Institute, Department of Climate and Computational Geophysics, University of Copenhagen, Copenhagen, Denmark
推荐引用方式 GB/T 7714	Jach L.,Warrach-Sagi K.,Ingwersen J.,et al. Land Cover Impacts on Land-Atmosphere Coupling Strength in Climate Simulations With WRF Over Europe[J],2020,125(18).
APA	Jach L.,Warrach-Sagi K.,Ingwersen J.,Kaas E.,&Wulfmeyer V..(2020).Land Cover Impacts on Land-Atmosphere Coupling Strength in Climate Simulations With WRF Over Europe.Journal of Geophysical Research: Atmospheres,125(18).
MLA	Jach L.,et al."Land Cover Impacts on Land-Atmosphere Coupling Strength in Climate Simulations With WRF Over Europe".Journal of Geophysical Research: Atmospheres 125.18(2020).