Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018JD029045 |
Synoptic and Mesoscale Forcing of Southern California Extreme Precipitation | |
Cannon, Forest1; Hecht, Chad W.1; Cordeira, Jason M.2; Ralph, F. Martin1 | |
2018-12-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:24页码:13714-13730 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Southern California water resources are heavily dependent on a small number of extreme precipitation events each winter season, which dictate the region's highly variable interannual accumulations. In the Santa Ana River Watershed, on average, three extreme events per year contribute half of annual precipitation, yet there are relatively few studies of the synoptic to mesoscale processes that drive precipitation during these events. This study uses an ingredient-based approach in identifying the contributions of orographic forcing, dynamical forcing, and convective instability to extreme precipitation in the watershed in 107 storms that produced roughly 50% of all precipitation from 1981 to 2017. The influence of dynamical forcing and convective instability on event precipitation distributions is investigated relative to the dominant influence of orographic forcing that is typically found in landfalling atmospheric rivers. Case studies of two high-impact events from the 2017 winter season demonstrate differences in the roles of synoptic ascent and mesoscale convective features in modifying precipitation location, rate, and accumulation over the watershed. The 17 and 18 February 2017 case study included a narrow cold-frontal rainband that produced high-intensity short-duration precipitation over low elevations of the watershed. In the 107 extreme event records, similar modification of the precipitation distribution toward non-orographic rainfall was related to significant changes in the synoptic-scale circulation that favored enhanced dynamics and upstream ascent associated with frontogenesis. Variability in precipitation mechanisms is of primary interest to weather forecasters and water managers as it modifies event impacts and predictability. |
英文关键词 | extreme precipitation atmospheric rivers Southern California hydroclimate |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000455876300006 |
WOS关键词 | NORTHEASTERN PACIFIC-OCEAN ; ATMOSPHERIC RIVERS ; WINTER ; CLIMATOLOGY ; RAINFALL ; EVENTS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/33015 |
专题 | 气候变化 |
作者单位 | 1.Univ Calif San Diego, Scripps Inst Oceanog, Ctr Western Weather & Water Extremes, La Jolla, CA 92093 USA; 2.Plymouth State Univ, Dept Atmospher Sci & Chem, Plymouth, NH USA |
推荐引用方式 GB/T 7714 | Cannon, Forest,Hecht, Chad W.,Cordeira, Jason M.,et al. Synoptic and Mesoscale Forcing of Southern California Extreme Precipitation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(24):13714-13730. |
APA | Cannon, Forest,Hecht, Chad W.,Cordeira, Jason M.,&Ralph, F. Martin.(2018).Synoptic and Mesoscale Forcing of Southern California Extreme Precipitation.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(24),13714-13730. |
MLA | Cannon, Forest,et al."Synoptic and Mesoscale Forcing of Southern California Extreme Precipitation".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.24(2018):13714-13730. |
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