The turbulent structure of the marine atmospheric boundary layer during and before a cold front

Huang, Jian; Zou, Zhongshui; Zeng, Qingcun; Li, Peiliang; Song, Jinbao; Wu, Lin; Zhang, Jun A.; Li, Shuiqing; Chan, Pak-wai

doi:10.1175/JAS-D-19-0314.1

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The turbulent structure of the marine atmospheric boundary layer during and before a cold front

2021
By Huang, Jian ; Zou, Zhongshui ; Zeng, Qingcun ; ...
Source: Journal of the Atmospheric Sciences, 78(3) 1-13

[PDF-2.33 MB]

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Details:

Journal Title:

Journal of the Atmospheric Sciences
Personal Author:

Huang, Jian ; Zou, Zhongshui ; Zeng, Qingcun ; Li, Peiliang ; Song, Jinbao ; ... More +

Huang, Jian ; Zou, Zhongshui ; Zeng, Qingcun ; Li, Peiliang ; Song, Jinbao ; Wu, Lin ; Zhang, Jun A. ; Li, Shuiqing ; Chan, Pak-wai Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies)

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) Less -
Description:

The turbulent structure within the marine atmospheric boundary layer is investigated based on four levels of observations at a fixed marine platform. During and before a cold front, the ocean surface is dominated by wind sea and swell waves, respectively, affording the opportunity to test the theory recently proposed in laboratory experiments or for flat land surfaces. The results reveal that the velocity spectra follow a k−1 law within the intermediate wavenumber (k) range immediately below inertial subrange during the cold front. A logarithmic height dependence of the horizontal velocity variances is also observed above the height of 20 m, while the vertical velocity variances increase with increasing height following a power law of 2/3. These features confirm the attached eddy model and the “top-down model” of turbulence over the ocean surface. However, the behavior of velocity variances under swell conditions is much different from those during the cold front, although a remarkable k−1 law can be observed in the velocity spectra. The quadrant analysis of the momentum flux also shows a significantly different result for the two conditions.
Keywords:

[+]

Fronts (Meteorology) Marine Meteorology Mathematical Models Monitoring Ocean Waves Atmosphere-ocean Interaction Cold Fronts Marine Boundary Layer Turbulence
Source:

Journal of the Atmospheric Sciences, 78(3) 1-13
DOI:

https://doi.org/10.1175/JAS-D-19-0314.1
Document Type:

Journal Article
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urn:sha256:b16476dfddcdb7ae7ed973ba088300411e36e9b34d9413bfc645c9f57a21016a
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https://repository.library.noaa.gov/view/noaa/28995/noaa_28995_DS1.pdf
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