气候变化领域集成服务门户(CCPortal): Ridging associated with Drought across the Western and Southwestern United States: Characteristics, trends, and predictability sources

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DOI	10.1175/JCLI-D-19-0439.1
	Ridging associated with Drought across the Western and Southwestern United States: Characteristics, trends, and predictability sources
	Gibson P.B.; Waliser D.E.; Guan B.; Deflorio M.J.; Ralph F.M.; Swain D.L.
发表日期	2020
ISSN	08948755
起始页码	2485
结束页码	2508
卷号	33 期号:7
英文摘要	Persistent winter ridging events are a consistent feature of meteorological drought across the western and southwestern United States. In this study, a ridge detection algorithm is developed and applied on daily geopotential height anomalies to track and quantify the diversity of individual ridge characteristics (e.g., position, frequency, magnitude, extent, and persistence). Three dominant ridge types are shown to play important, but differing, roles for influencing the location of landfalling atmospheric rivers (ARs), precipitation, and subsequently meteorological drought. For California, a combination of these ridge types is important for influencing precipitation deficits on daily through seasonal time scales, indicating the various pathways by which ridging can induce drought. Furthermore, both the frequency of ridge types and reduced AR activity are necessary features for explaining drought variability on seasonal time scales across the western and southwestern regions. The three ridge types are found to be associated in different ways with various remote drivers and modes of variability, highlighting possible sources of subseasonal-to-seasonal (S2S) predictability. A comparison between ridge types shows that anomalously large and persistent ridging events relate to different Rossby wave trains across the Pacific with different preferential upstream locations of tropical heating. For the "South-ridge" type, centered over the Southwest, a positive trend is found in both the frequency and persistence of these events across recent decades, likely contributing to observed regional drying. These results illustrate the utility of feature tracking for characterizing a wider range of ridging features that collectively influence precipitation deficits and drought. © 2020 American Meteorological Society.
语种	英语
scopus关键词	Mechanical waves; Feature-tracking; Geopotential height anomalies; Landfalling; Meteorological drought; Precipitation deficits; Ridge detections; Rossby wave; Time-scales; Drought; algorithm; drought; precipitation assessment; precipitation intensity; prediction; seasonal variation; timescale; weather forecasting; winter; United States; Amblema plicata
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178738
作者单位	Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, Los Angeles, CA, United States; Center for Western Weather and Water Extremes, Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States; Institute of the Environment and Sustainability, University of California, Los Angeles, Los Angeles, CA, United States; Capacity Center for Climate and Weather Extremes, National Center for Atmospheric Research, Boulder, CO, United States; Nature Conservancy of California, San Francisco, CA, United States
推荐引用方式 GB/T 7714	Gibson P.B.,Waliser D.E.,Guan B.,et al. Ridging associated with Drought across the Western and Southwestern United States: Characteristics, trends, and predictability sources[J],2020,33(7).
APA	Gibson P.B.,Waliser D.E.,Guan B.,Deflorio M.J.,Ralph F.M.,&Swain D.L..(2020).Ridging associated with Drought across the Western and Southwestern United States: Characteristics, trends, and predictability sources.Journal of Climate,33(7).
MLA	Gibson P.B.,et al."Ridging associated with Drought across the Western and Southwestern United States: Characteristics, trends, and predictability sources".Journal of Climate 33.7(2020).