DOI: 10.1002/2017JC013247
Scopus记录号: 2-s2.0-85042184719
论文题名: Currents and Mixing in the San Lorenzo Overflow, Northern Gulf of California
作者: Rosas-Villegas F. ; López M. ; Candela J.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 2 起始页码: 1339
结束页码: 1353
语种: 英语
英文关键词: currents
; Gulf of California
; mixing
; overflow
Scopus关键词: Acoustic Doppler Current Profiler
; asymmetry
; dissipation
; Froude number
; mixing
; semidiurnal tide
; temperature effect
; tidal current
; turbulence
; Gulf of California
; Pacific Ocean
英文摘要: The main properties of the San Lorenzo (SL) overflow are studied, using data from two nonsimultaneous ADCP moorings (located at the sill, and 5 km downstream), as well as CTD and LADCP profiles. Strong tidal currents at the sill modulate the overflow, which is not shut down during the neaps. At the downstream site, the largest flood currents are associated with colder water advected from the sill, flowing downslope, and creating an asymmetry in the semidiurnal tidal cycle. The overflow introduces a significant fortnightly harmonic at the downstream site, and delays the M2 tidal currents for more than an hour with respect to the currents at the sill. The overflow mixes with the overlying water by entrainment during its supercritical stage, reaching near-bottom velocities as high as 1.5 ms−1 and an estimated mean transport of 0.11 Sv; almost twice that estimated at the sill for the same period of the year. Estimated Froude numbers during spring tides suggest the development of an internal hydraulic jump. After relaxation of the maximum downstream currents, high-frequency temperature fluctuations, likely linked to upstream traveling waves, are consistently observed. Direct estimations of the turbulent dissipation rates were used to compute diapycnal diffusivity (Kρ) profiles. Mean estimates of Kρ, as high as 5.5 × 10−2 m2s−1, show that shear at the interface is the most significant source of cross-isopycnal mixing along the SL overflow during ebb tides. © 2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114524
Appears in Collections: 气候减缓与适应
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作者单位: Departamento de Oceanografía Física, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Ensenada, Baja California, Mexico
Recommended Citation:
Rosas-Villegas F.,López M.,Candela J.. Currents and Mixing in the San Lorenzo Overflow, Northern Gulf of California[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(2)