DOI: 10.1029/93jc02298. Diurnal restratification and turbulence in the oceanic surface mixed layer: 2. Modeling

Diurnal restratification and turbulence in the oceanic surface mixed layer: 2. Modeling

10.1029/93jc02298

Crossref journal-article

American Geophysical Union (AGU)

Journal of Geophysical Research: Oceans (13)

Abstract

We find that daytime restratification of the remnant layer is important to modeling both the decay of convective turbulence during the day and convective deepening the following night. Penetrating solar insolation accounted for about 60% of the observed restratification of the remnant layer. Of the other processes supplying the remaining restratification, we believe lateral advection is the most important and sets a limit on the capabilities of one‐dimensional mixed‐layer models. In the morning, with the end of convective forcing, there was an initial period lasting nearly an hour, similar to the convective time scale, during which ε in the remnant layer remained nearly constant. After that, turbulence in the remnant layer could be modeled in accordance with a balance between ε and the storage term for turbulent kinetic energy (TKE). Energy storage is computed using q2 = (εl/C)2/3, where l = 0.84LO, the Ozmidov scale, matches observed overturning scales during most of the decay. Calculating LO for the observed linearly increasing stratification gives a modified exponential form for the decay. A value of C = 0.04 gives the best fit. This decay lasted about 5 hours, until 〈ε〉 reached ≈ 5 × 10−10 W kg−1. Then for the remainder of the restratification period, dissipation and production of TKE due to vertical shear appeared to be approaching a balance.

Bibliography

Brainerd, K. E., & Gregg, M. C. (1993). Diurnal restratification and turbulence in the oceanic surface mixed layer: 2. Modeling. Journal of Geophysical Research: Oceans, 98(C12), 22657â22664. Portico.

Authors 2

K. E. Brainerd (first)
M. C. Gregg (additional)

References 22 Referenced 27

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{'issue': '12', 'key': 'e_1_2_1_4_1', 'article-title': 'Diurnal restratification and turbulence in the oceanic surface mixed layer, 1, Observations', 'volume': '98', 'author': 'Brainerd K. E.', 'year': '1992', 'journal-title': 'J. Geophys. Res.'} / J. Geophys. Res. / Diurnal restratification and turbulence in the oceanic surface mixed layer, 1, Observations by Brainerd K. E. (1992)
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{'key': 'e_1_2_1_10_1', 'first-page': '56', 'article-title': 'The equation of turbulent motion in an incompressible fluid', 'volume': '6', 'author': 'Kolmogorov A. N.', 'year': '1942', 'journal-title': 'Izv. Akad. Nauk SSSR, Ser. Fiz.'} / Izv. Akad. Nauk SSSR, Ser. Fiz. / The equation of turbulent motion in an incompressible fluid by Kolmogorov A. N. (1942)
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{'key': 'e_1_2_1_18_1', 'first-page': '398', 'article-title': 'Calculating the depth of penetration of solar energy in sea water (with the Pacific as an example)', 'volume': '14', 'author': 'Rutkovskaya V. A.', 'year': '1974', 'journal-title': 'Okeanologiya'} / Okeanologiya / Calculating the depth of penetration of solar energy in sea water (with the Pacific as an example) by Rutkovskaya V. A. (1974)
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Dates

Type	When
Created	17 years, 6 months ago (Feb. 6, 2008, 9:06 a.m.)
Deposited	1 year, 11 months ago (Sept. 22, 2023, 5:28 p.m.)
Indexed	1 year, 1 month ago (July 5, 2024, 1:53 a.m.)
Issued	31 years, 8 months ago (Dec. 15, 1993)
Published	31 years, 8 months ago (Dec. 15, 1993)
Published Online	12 years, 11 months ago (Sept. 20, 2012)
Published Print	31 years, 8 months ago (Dec. 15, 1993)

Funders 0

None

BibTeX

@article{Brainerd_1993, title={Diurnal restratification and turbulence in the oceanic surface mixed layer: 2. Modeling}, volume={98}, ISSN={0148-0227}, url={http://dx.doi.org/10.1029/93jc02298}, DOI={10.1029/93jc02298}, number={C12}, journal={Journal of Geophysical Research: Oceans}, publisher={American Geophysical Union (AGU)}, author={Brainerd, K. E. and Gregg, M. C.}, year={1993}, month=dec, pages={22657–22664} }

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