气候变化领域集成服务门户(CCPortal): Synoptic Characteristics of 14-Day Extreme Precipitation Events across the United States

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DOI	10.1175/JCLI-D-19-0563.1
	Synoptic Characteristics of 14-Day Extreme Precipitation Events across the United States
	Jennrich G.C.; Furtado J.C.; Basara J.B.; Martin E.R.
发表日期	2020
ISSN	0894-8755
起始页码	6423
结束页码	6440
卷号	33 期号:15
英文摘要	Although significant improvements have been made to the prediction and understanding of extreme precipitation events in recent decades, there is still much to learn about these impactful events on the subseasonal time scale. This study focuses on identifying synoptic patterns and precursors ahead of an extreme precipitation event over the contiguous United States (CONUS). First, we provide a robust definition for 14-day "extreme precipitation events" and partition the CONUS into six different geographic regions to compare and contrast the synoptic patterns associated with events in those regions. Then, several atmospheric variables from ERA-Interim (e.g., geopotential height and zonal winds) are composited to understand the evolution of the atmospheric state before and during a 14-day extreme precipitation event. Common synoptic signals seen during events include significant zonally oriented trough-ridge patterns, an energized subtropical jet stream, and enhanced moisture transport into the affected area. Also, atmospheric-river activity increases in the specific region during these events. Modes of climate variability and lagged composites are then investigated for their potential use in lead-time prediction. Key findings include synoptic-scale anomalies in the North Pacific Ocean and regional connections to modes such as the Pacific-North American pattern and the North Pacific Oscillation. Taken together, our results represent a significant step forward in understanding the evolution of 14-day extreme precipitation events for potential damage and casualty mitigation. © 2020 American Meteorological Society. All rights reserved.
英文关键词	Climate models; Climatology; Atmospheric variables; Climate variability; Extreme precipitation events; Geo-potential heights; Moisture transport; North American; North Pacific Ocean; Subtropical jet; Precipitation (meteorology); climate variation; extreme event; jet stream; moisture transfer; precipitation (climatology); synoptic meteorology; Pacific Ocean; Pacific Ocean (North); United States
语种	英语
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/171201
作者单位	School of Meteorology, University of Oklahoma, Norman,Oklahoma, United States; School of Meteorology and Civil and Environmental Engineering, University of Oklahoma, Norman, Oklahoma, United States; South Central Climate Adaptation Science Center, School of Meteorology, University of Oklahoma, Norman, Oklahoma, United States
推荐引用方式 GB/T 7714	Jennrich G.C.,Furtado J.C.,Basara J.B.,et al. Synoptic Characteristics of 14-Day Extreme Precipitation Events across the United States[J],2020,33(15).
APA	Jennrich G.C.,Furtado J.C.,Basara J.B.,&Martin E.R..(2020).Synoptic Characteristics of 14-Day Extreme Precipitation Events across the United States.Journal of Climate,33(15).
MLA	Jennrich G.C.,et al."Synoptic Characteristics of 14-Day Extreme Precipitation Events across the United States".Journal of Climate 33.15(2020).