DOI: 10.1002/2014GL061241
论文题名: Continental microseismic intensity delineates oceanic upwelling timing along the west coast of North America
作者: Thomson R.E. ; Heesemann M. ; Davis E.E. ; Hourston R.A.S.
刊名: Geophysical Research Letters
ISSN: 0094-9762
EISSN: 1944-9493
出版年: 2014
卷: 41, 期: 19 起始页码: 6872
结束页码: 6880
语种: 英语
英文关键词: coastal upwelling indices
; microseisms
; ocean productivity
; spring and fall transitions
Scopus关键词: Coastal engineering
; Ecology
; Ecosystems
; Productivity
; Biological productivity
; California current systems
; Coastal upwelling
; Coastal upwelling indices
; Integrated response
; Interannual variability
; microseisms
; Prevailing winds
; Seismology
; downwelling
; pressure field
; seismic wave
; upwelling
; wind stress
; wind-wave interaction
; California Current
; North America
; Pacific Ocean
英文摘要: The biological productivity of coastal upwelling regions undergoes marked interannual variability as marine ecosystems respond to changes in the prevailing winds. Determination of the principal metrics that define the upwelling cycle - the spring transition, when ocean conditions switch from downwelling- to upwelling-favorable, and the Fall Transition, when conditions return to downwelling-favorable - is essential for understanding changes in coastal productivity. Here we demonstrate that upwelling in the northern California Current System may be delineated by changes in microseismic activity recorded at a broadband seismological station in southwestern British Columbia. Observed high correlation between microseismic intensity and offshore bottom pressure fluctuations at ~0.2 Hz confirms a direct link to regional wind-wave generation. Comparison of transition times derived from coincident 20 year records of microseismic intensity and alongshore wind stress for the British Columbia-Oregon coast suggests that seismically derived times may be more representative of coastal upwelling than times derived using traditional methods. Key Points Microseismic motions define timing of the oceanic spring and fall transitionsMicroseisms are the integrated response to coastal wave-wave interactionsTwenty-year coastal upwelling records are created for California Current System ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911127105&doi=10.1002%2f2014GL061241&partnerID=40&md5=4415d3a280b7d78a37e050b2502d9905
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7026
Appears in Collections: 气候减缓与适应
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作者单位: Fisheries and Oceans Canada, Institute of Ocean Sciences, Sidney, BC, Canada
Recommended Citation:
Thomson R.E.,Heesemann M.,Davis E.E.,et al. Continental microseismic intensity delineates oceanic upwelling timing along the west coast of North America[J]. Geophysical Research Letters,2014-01-01,41(19).