DOI: 10.1175/JCLI-D-15-0270.1
Scopus记录号: 2-s2.0-84957824287
论文题名: California Central Valley summer heat waves form two ways
作者: Lee Y.-Y. ; Grotjahn R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 3 起始页码: 1201
结束页码: 1217
语种: 英语
Scopus关键词: Classification (of information)
; Climate models
; Fluxes
; Heating
; Landforms
; Temperature
; Trajectories
; Different evolutions
; Extreme events
; Horizontal advection
; Large scale motion
; Meteorological patterns
; Northwestern United States
; Statistical techniques
; Temporal and spatial evolutions
; Climatology
; air-sea interaction
; atmosphere-ocean system
; climate classification
; climate modeling
; extreme event
; numerical model
; troposphere
; California
; California Valley
; Pacific Ocean
; Pacific Ocean (North)
; United States
英文摘要: California Central Valley (CCV) heat waves are grouped into two types based on the temporal and spatial evolution of the large-scale meteorological patterns (LSMPs) prior to onset. The k-means clustering of key features in the anomalous temperature and zonal wind identifies the two groups. Composite analyses show different evolution prior to developing a similar ridge-trough-ridge pattern spanning the North Pacific at the onset of CCV hot spells. Backward trajectories show adiabatic heating of air enhanced by anomalous sinking plus horizontal advection as the main mechanisms to create hot lower-tropospheric air just off the Northern California coast, although the paths differ between clusters. The first cluster develops the ridge at the west coast on the day before onset, consistent with wave activity flux traveling across the North Pacific. Air parcels that arrive at the maximum temperature anomaly (just off the Northern California coast) tend to travel a long distance across the Pacific from the west. The second cluster has the ridge in place for several days prior to extreme CCVheat, but this ridge is located farther north, with heat anomaly over the northwestern United States. This ridge expands south as air parcels at midtropospheric levels descend from the northwest while lower-level parcels over land tend to bring hot air from directions ranging from the hot area to the northeast to the desert areas to the southeast. These two types reveal unexpected dynamical complexity, hint at different remote associations, and expand the assessment needed of climate models' simulations of these heat waves. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50349
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Land, Air and Water Resources, University of California, Davis, Davis, CA, United States; Climate Research Department, APEC Climate Center, Busan, South Korea
Recommended Citation:
Lee Y.-Y.,Grotjahn R.. California Central Valley summer heat waves form two ways[J]. Journal of Climate,2016-01-01,29(3)