气候变化领域集成服务门户(CCPortal): Dynamical downscaling over the complex terrain of southwest South America: present climate conditions and added value analysis

CCPortal

DOI	10.1007/s00382-019-04959-y
	Dynamical downscaling over the complex terrain of southwest South America: present climate conditions and added value analysis
	Bozkurt D.; Rojas M.; Boisier J.P.; Rondanelli R.; Garreaud R.; Gallardo L.
发表日期	2019
ISSN	0930-7575
起始页码	6745
结束页码	6767
卷号	53 期号:11
英文摘要	This study evaluates hindcast simulations performed with a regional climate model (RCM, RegCM4) driven by reanalysis data (ERA-Interim) over the Pacific coast and Andes Cordillera of extratropical South America. A nested domain configuration at 0. 44 ∘ (∼ 50 km) and 0. 09 ∘ (∼ 10 km) spatial resolutions is used for the simulations. RegCM4 is also driven by a global climate model (GCM, MPI-ESM-MR) on the same domain configuration to asses the added values for temperature and precipitation (historical simulations). Overall, both 10 km hindcast and historical simulation results are promising and exhibit a better representation of near-surface air temperature and precipitation variability compared to the 50 km simulations. High-resolution simulations suppress an overestimation of precipitation over the Andes Cordillera of northern Chile found with the 50 km simulations. The simulated daily temperature and precipitation extreme indices from 10 km hindcast simulation show a closer estimation of the observed fields. A persistent warm bias (∼+4∘C) over the Atacama Desert in 10 km hindcast simulation reveals the complexity in representing land surface and radiative processes over the desert. Difficulties in capturing the temperature trend in northern Chile are notable for both hindcast simulations. Both resolutions exhibit added values for temperature and precipitation over large parts of Chile, in particular, the 10 km resolves the coastal-valley Andes transitions over central Chile. Our results highlight that resolutions coarser than 50 km (e.g., GCMs and reanalysis) miss important climate gradients imposed by complex topography. Given that the highest spatial resolution of the current regional simulations over the South America is about 50 km, higher resolutions are important to improve our understanding of the dynamical processes that determine climate over complex terrain and extreme environments. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Atacama Desert; Chile; Climate variability; Model evaluation; Patagonia; Temporal-spatial scale analysis
语种	英语
scopus关键词	climate conditions; climate modeling; climate variation; complex terrain; downscaling; regional climate; spatial analysis; temporal analysis; Andes; Atacama Desert; Chile; Patagonia; Equus asinus
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145813
作者单位	Center for Climate and Resilience Research, University of Chile, Santiago, Chile; Department of Geophysics, University of Chile, Santiago, Chile
推荐引用方式 GB/T 7714	Bozkurt D.,Rojas M.,Boisier J.P.,et al. Dynamical downscaling over the complex terrain of southwest South America: present climate conditions and added value analysis[J],2019,53(11).
APA	Bozkurt D.,Rojas M.,Boisier J.P.,Rondanelli R.,Garreaud R.,&Gallardo L..(2019).Dynamical downscaling over the complex terrain of southwest South America: present climate conditions and added value analysis.Climate Dynamics,53(11).
MLA	Bozkurt D.,et al."Dynamical downscaling over the complex terrain of southwest South America: present climate conditions and added value analysis".Climate Dynamics 53.11(2019).