DOI: 10.1002/2014GL061939
论文题名: Mixed and mixing layer depths in the ocean surface boundary layer under conditions of diurnal stratification
作者: Sutherland G. ; Reverdin G. ; Marié L. ; Ward B.
刊名: Geophysical Research Letters
ISSN: 0094-9552
EISSN: 1944-9283
出版年: 2014
卷: 41, 期: 23 起始页码: 8469
结束页码: 8476
语种: 英语
英文关键词: buoyancy
; mixed and mixing layer depths
; ocean surface boundary layer
Scopus关键词: Boundary layers
; Buoyancy
; Mixing
; Background level
; Density threshold
; Dissipation level
; Mixing layers
; Ocean surfaces
; Restratification
; Surface salinities
; Turbulent dissipation rates
; Boundary layer flow
; boundary condition
; buoyancy
; density
; dissipation
; diurnal variation
; microstructure
; mixed layer
; sea surface
; stratification
; Atlantic Ocean
; Atlantic Ocean (Subtropical)
英文摘要: A comparison between mixed (MLD) and mixing (XLD) layer depths is presented from the SubTRopical Atlantic Surface Salinity Experiment (STRASSE) cruise in the subtropical Atlantic. This study consists of 400 microstructure profiles during fairly calm and moderate conditions (2 < U10 < 10 m s-1) and strong solar heating O(1000 W m-2). The XLD is determined from a decrease in the turbulent dissipation rate to an assumed background level. Two different thresholds for the background dissipation level are tested, 10-8 and 10-9 m2 s-3, and these are compared with the MLD as calculated using a density threshold. The larger background threshold agrees with the MLD during restratification but only extends to half the MLD during nighttime convection, while the lesser threshold agrees well during convection but is deeper by a factor of 2 during restratification. Observations suggest the use of a larger density threshold to determine the MLD in a buoyancy driven regime. Key PointsWe obtained density and dissipation measurements at the ocean surfaceWe made estimates of the mixed (MLD) and mixing (XLD) layer depthsWe found a relationship between MLD and XLD for buoyancy-driven conditions ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921549798&doi=10.1002%2f2014GL061939&partnerID=40&md5=2381a1571dccc51fb58143bff8389da0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6816
Appears in Collections: 气候减缓与适应
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作者单位: School of Physics, National University of Ireland, Galway, Ireland
Recommended Citation:
Sutherland G.,Reverdin G.,Marié L.,et al. Mixed and mixing layer depths in the ocean surface boundary layer under conditions of diurnal stratification[J]. Geophysical Research Letters,2014-01-01,41(23).