Simulations of the Holocene climate in Europe using an interactive downscaling within the iLOVECLIM model (version 1.1)

Climate of the past

article

Frank Arthur¹  Didier M. Roche²  Ralph Fyfe⁴  Aurélien Quiquet³  Hans Renssen¹ 

[1]Department of Natural Sciences and Environmental Health, University of South-Eastern Norway

[2]Faculty of Science, Cluster Earth and Climate, Vrije Universiteit Amsterdam

[3]Laboratoire des Sciences du Climat et de l"Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay

[4]School of Geography, Earth and Environmental Sciences, University of Plymouth

DOI  :  10.5194/cp-19-87-2023

学科分类：社会科学、人文和艺术（综合）

来源: Copernicus Publications

【 摘 要 】

This study presents the application of an interactive downscaling in Europe using iLOVECLIM (a model of intermediate complexity), increasing its atmospheric resolution from 5.56 to 0.25 ∘ kilometric. A transient simulation using the appropriate climate forcings for the entire Holocene (11.5–0 ka BP) was done for both the standard version of the model and with an interactive downscaling applied. Our results show that simulations from downscaling present spatial variability that agrees better with proxy-based reconstructions and other climate models as compared to the standard model. The downscaling scheme simulates much higher (by at least a factor of 2) precipitation maxima and provides detailed information in mountainous regions. We focus on examples from the Scandes mountains, the Alps, the Scottish Highlands, and the Mediterranean. The higher spatial resolution of the downscaling provides a more realistic overview of the topography and gives local climate information, such as precipitation and temperature gradient, that is important for paleoclimate studies. With downscaling, we simulate similar trends and spatial patterns of the precipitation changes reconstructed by other proxy studies (for example in the Alps) as compared to the standard version. Our downscaling tool is numerically cheap, implying that our model can perform kilometric, multi-millennial simulations and is suitable for future studies.

【 授权许可】

CC BY