气候变化领域集成服务门户(CCPortal): Assessment of Uncertainty Sources in Snow Cover Simulation in the Tibetan Plateau

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DOI	10.1029/2020JD032674
	Assessment of Uncertainty Sources in Snow Cover Simulation in the Tibetan Plateau
	Jiang Y.; Chen F.; Gao Y.; He C.; Barlage M.; Huang W.
发表日期	2020
ISSN	2169897X
卷号	125 期号:18
英文摘要	Snow cover over the Tibetan Plateau (TP) plays an important role in Asian climate. State-of-the-art models, however, show significant simulation biases. In this study, we assess the main uncertainty associated with model physics in snow cover modeling over the TP using ground-based observations and high-resolution snow cover satellite products from the Moderate Resolution Imaging Spectroradiometer (MODIS) and FengYun-3B (FY3B). We first conducted 10-km simulations using the Noah with multiparameterization (Noah-MP) land surface model by optimizing physics-scheme options, which reduces 8.2% absolute bias of annual snow cover fraction (SCF) compared with the default model settings. Then, five SCF parameterizations in Noah-MP were optimized and assessed, with three of them further reducing the annual SCF biases from around 15% to less than 2%. Thus, optimizing SCF parameterizations appears to be more important than optimizing physics-scheme options in reducing the uncertainty of snow modeling. As a result of improved SCF, the positive bias of simulated surface albedo decreases significantly compared to the GLASS albedo data, particularly in high-elevation regions. This substantially enhances the absorbed solar radiation and further reduces the annual mean biases of ground temperature from −3.5 to −0.8°C and snow depth from 4.2 to 0.2 mm. However, the optimized model still overestimates SCF in the western TP and underestimates SCF in the eastern TP. Further analysis using a higher-resolution (4 km) simulation driven by topographically adjusted air temperature shows slight improvement, suggesting a rather limited contribution of the finer-scale land surface characteristics to SCF uncertainty. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Noah-MP; snow cover fraction; Tibetan Plateau; uncertainty
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185741
作者单位	Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, China; Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences, Fudan University, Shanghai, China; Lanzhou Central Meteorological Observatory, Lanzhou, China
推荐引用方式 GB/T 7714	Jiang Y.,Chen F.,Gao Y.,et al. Assessment of Uncertainty Sources in Snow Cover Simulation in the Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2020,125(18).
APA	Jiang Y.,Chen F.,Gao Y.,He C.,Barlage M.,&Huang W..(2020).Assessment of Uncertainty Sources in Snow Cover Simulation in the Tibetan Plateau.Journal of Geophysical Research: Atmospheres,125(18).
MLA	Jiang Y.,et al."Assessment of Uncertainty Sources in Snow Cover Simulation in the Tibetan Plateau".Journal of Geophysical Research: Atmospheres 125.18(2020).