气候变化领域集成服务门户(CCPortal): WRF downscaling improves ERA-Interim representation of precipitation around a tropical Andean valley during El Niño: implications for GCM-scale simulation of precipitation over complex terrain

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DOI	10.1007/s00382-018-4403-0
	WRF downscaling improves ERA-Interim representation of precipitation around a tropical Andean valley during El Niño: implications for GCM-scale simulation of precipitation over complex terrain
	Posada-Marín J.A.; Rendón A.M.; Salazar J.F.; Mejía J.F.; Villegas J.C.
发表日期	2019
ISSN	0930-7575
起始页码	3609
结束页码	3629
卷号	52 期号:2020-05-06
英文摘要	Precipitation in the tropical Andes is strongly influenced by the ENSO phases and orographic effects. In particular, precipitation can be drastically reduced during El Niño. Decision-making about water resources relies on modelling precipitation as the main source for water availability. Here we evaluate ERA-Interim´s capacity to represent precipitation in the mountainous central Colombian Andes, a strategic region for water supply and hydropower generation, for different phases of ENSO during 1998–2012. Our results show that ERA-Interim fails to reproduce important features of precipitation spatial and temporal variability during different ENSO phases. Most critical in these results is how ERA-Interim overestimates precipitation during the dry season in El Niño years, which corresponds to the most critical condition for water supply. We show that ERA-Interim limitations are likely related to its simplified representation of the complex topography in the region, which excludes the inter-Andean Cauca river valley. To improve this, we implement a dynamical downscaling experiment using the WRF regional climate model, including a sensitivity analysis that considers three convective parameterization schemes and a convection-permitting simulation. WRF downscaling outperforms ERA-Interim in the representation of precipitation during the dry season of El Niño years, especially through correcting positive precipitation biases. This improvement is related to a better representation of orographic effects in WRF simulations. Our results suggest that ERA-Interim and, more generally, climate simulations with comparable coarse resolutions, may produce misleading precipitation overestimations in the tropical Andes if they do not adequately represent inter-Andean valleys, with important implications for water resources management. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Dynamical downscaling; El Niño; ERA-Interim; Precipitation; Tropical Andes; WRF model
语种	英语
scopus关键词	climate modeling; downscaling; El Nino; El Nino-Southern Oscillation; general circulation model; orographic effect; precipitation assessment; terrain; tropical environment; weather forecasting; Andes; Columbia [Missouri]; Missouri; United States
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/146440
作者单位	Grupo de Ingeniería y Gestión Ambiental (GIGA), Escuela Ambiental, Facultad de Ingeniería, Universidad de Antioquia, Calle 67 # 53-108, Medellín, Colombia; Department of Atmospheric Sciences, Desert Research Institute, Reno, NV, United States
推荐引用方式 GB/T 7714	Posada-Marín J.A.,Rendón A.M.,Salazar J.F.,et al. WRF downscaling improves ERA-Interim representation of precipitation around a tropical Andean valley during El Niño: implications for GCM-scale simulation of precipitation over complex terrain[J],2019,52(2020-05-06).
APA	Posada-Marín J.A.,Rendón A.M.,Salazar J.F.,Mejía J.F.,&Villegas J.C..(2019).WRF downscaling improves ERA-Interim representation of precipitation around a tropical Andean valley during El Niño: implications for GCM-scale simulation of precipitation over complex terrain.Climate Dynamics,52(2020-05-06).
MLA	Posada-Marín J.A.,et al."WRF downscaling improves ERA-Interim representation of precipitation around a tropical Andean valley during El Niño: implications for GCM-scale simulation of precipitation over complex terrain".Climate Dynamics 52.2020-05-06(2019).