DOI: 10.1002/grl.50400
论文题名: Prevalence of strong bottom currents in the greater Agulhas system
作者: Cronin M.F. ; Tozuka T. ; Biastoch A. ; Durgadoo J.V. ; Beal L.M.
刊名: Geophysical Research Letters
ISSN: 0094-9131
EISSN: 1944-8862
出版年: 2013
卷: 40, 期: 9 起始页码: 1772
结束页码: 1776
语种: 英语
英文关键词: Agulhas
; Benthic storms
; Bottom currents
Scopus关键词: Agulhas
; Agulhas current
; Agulhas system
; Bottom current
; Current meters
; Global ocean circulation model
; High resolution
; Surface current
; Sediment transport
; Sedimentology
; Storms
; benthic environment
; bottom current
; data set
; dust storm
; oceanic circulation
; sediment transport
; Africa
; Agulhas Current
; Indian Ocean
英文摘要: Deep current meter data and output from two high-resolution global ocean circulation models are used to determine the prevalence and location of strong bottom currents in the greater Agulhas Current system. The two models and current meter data are remarkably consistent, showing that benthic storms, with bottom currents greater than 0.2 m s-1, occur throughout the Agulhas retroflection region south of Africa more than 20% of the time. Furthermore, beneath the mean Agulhas Current core and the retroflection front, bottom currents exceed 0.2 m s-1 more than 50% of the time, while away from strong surface currents, bottom currents rarely exceed 0.2 m s-1. Implications for sediment transport are discussed and the results are compared to atmospheric storms. Benthic storms of this strength (0.2 m s-1) are comparable to a 9 m s-1 (Beaufort 5) windstorm, but scaling shows that benthic storms may be less effective at lifting and transporting sediment than dust storms. Key Points Strong bottom currents are prevalent beneath surface currents in the greater Agulhas systemSurface currents can affect formation of contouritesNoncohesive sediment is lifted more easily by dust storms than by benthic storms ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879109638&doi=10.1002%2fgrl.50400&partnerID=40&md5=4b4a59b24a5d4504e8253b23911b5808
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6395
Appears in Collections: 气候减缓与适应
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作者单位: NOAA Pacific Marine Environmental Laboratory, 7600 Sandpoint Way NE, Seattle, WA 98115, United States
Recommended Citation:
Cronin M.F.,Tozuka T.,Biastoch A.,et al. Prevalence of strong bottom currents in the greater Agulhas system[J]. Geophysical Research Letters,2013-01-01,40(9).