气候变化领域集成服务门户(CCPortal): Evaluating Variable-Resolution CESM Over China and Western United States for Use in Water-Energy Nexus and Impacts Modeling

CCPortal

DOI	10.1029/2020JD034361
	Evaluating Variable-Resolution CESM Over China and Western United States for Use in Water-Energy Nexus and Impacts Modeling
	Xu Z.; Di Vittorio A.; Zhang J.; Rhoades A.; Xin X.; Xu H.; Xiao C.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:15
英文摘要	Climate models are critical tools to study earth system processes and are often further downscaled to provide refined-resolution data sets for regional water-energy impact analyses. In this study, the Variable-Resolution Community Earth System Model (VR-CESM), a new dynamical downscaling method, is employed to generate 1/8° simulations for China and the western United States over 1970–2006. Precipitation, temperature, snowpack, radiation, and wind speed are compared with two 1° global climate models, regional climate model ensemble, and reference data sets to evaluate their fidelity. Simulated precipitation skill is dependent upon the reference data sets used, a slight (<+10%) and spatially consistent wet bias in China during summer and the western United States during winter. Precipitation bias in VR-CESM is the smallest among models and demonstrates the added value provided by resolution refinement. However, temperature biases are generally greater than precipitation due to more complicated interactions among processes. VR-CESM simulates +2°C warm bias in the low-elevation regions in China but −2°C cold bias in mountains. However, DJF cold bias (−2.23°C to−3.37°C) and JJA warm bias (+1.13°C to +1.87°C) exist in the western United States. The modeling skills of precipitation and temperature at various topographies are similar in the two evaluated regions. The cold bias was likely affected by downward shortwave radiation deficit (−15%) and slow bias of surface wind speeds (−16% to −29%). Despite the wet and cold bias, snow water equivalent and snow cover are underestimated in mountains. We conclude that VR-CESM outperforms other models evaluated and provides the best estimation of downscaled climate model data for water-energy studies. © 2021. The Authors.
英文关键词	eastern China; global climate models; hydroclimate; VR-CESM; western U.S
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/237096
作者单位	Climate and Ecosystem Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; National Climate Center, China Meteorological Association, Beijing, China
推荐引用方式 GB/T 7714	Xu Z.,Di Vittorio A.,Zhang J.,et al. Evaluating Variable-Resolution CESM Over China and Western United States for Use in Water-Energy Nexus and Impacts Modeling[J],2021,126(15).
APA	Xu Z..,Di Vittorio A..,Zhang J..,Rhoades A..,Xin X..,...&Xiao C..(2021).Evaluating Variable-Resolution CESM Over China and Western United States for Use in Water-Energy Nexus and Impacts Modeling.Journal of Geophysical Research: Atmospheres,126(15).
MLA	Xu Z.,et al."Evaluating Variable-Resolution CESM Over China and Western United States for Use in Water-Energy Nexus and Impacts Modeling".Journal of Geophysical Research: Atmospheres 126.15(2021).