DOI: 10.1002/2016JD026174
论文题名: Atmospheric rivers in 20 year weather and climate simulations: A multimodel, global evaluation
作者: Guan B. ; Waliser D.E.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
卷: 122, 期: 11 起始页码: 5556
结束页码: 5581
语种: 英语
英文关键词: atmospheric rivers
; model evaluation
; weather/climate simulations
英文摘要: Atmospheric rivers (ARs) are narrow, elongated, synoptic jets of water vapor that play important roles in the global water cycle and meteorological/hydrological extremes. Increasing evidence shows that ARs have signatures and impacts in many regions across different continents. However, global-scale characterizations of AR representations in weather and climate models have been very limited. Using a recently developed AR detection algorithm oriented for global applications, the representation of AR activities in multidecade weather/climate simulations is evaluated. The algorithm is applied to 6-hourly (daily) integrated water vapor transport (IVT) from 22 (2) global weather/climate models that participated in the Global Energy and Water Cycle Experiment Atmospheric System Study–Year of Tropical Convection Multimodel Experiment, including four models with ocean-atmosphere coupling and two models with superparameterization. Multiple reanalysis products are used as references to help quantify model errors in the context of reanalysis uncertainty. Model performance is examined for key aspects of ARs (frequency, intensity, geometry, and seasonality), with the focus on identifying and understanding systematic errors in simulated ARs. The results highlight the range of model performances relative to reanalysis uncertainty in representing the most basic features of ARs. Among the 17 metrics considered, AR frequency, zonal IVT, fractional zonal circumference, fractional total meridional IVT, and three seasonality metrics have consistently large errors across all models. Possible connections between AR simulation qualities and aspects of model configurations are discussed. Despite the lack of a monotonic relationship, the importance of model horizontal resolution to the overall quality of AR simulation is suggested by the evaluation results. ©2017. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1221013
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62671
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Guan B.,Waliser D.E.. Atmospheric rivers in 20 year weather and climate simulations: A multimodel, global evaluation[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(11)