Radiative transfer in ocean turbulence and its effect on underwater light field
Turbulence in the upper ocean generates fluctuations in temperature and salinity, which result in variations in inherent optical properties (IOPs) and further change the underwater light field. A simulation-based study is performed for the radiative transfer (RT) of natural light in the turbulent fl...
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| Format: | Article |
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American Geophysical Union (AGU)
2019
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| Online Access: | http://hdl.handle.net/1721.1/120314 https://orcid.org/0000-0003-1273-9964 |
| _version_ | 1811082409827893248 |
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| author | Guo, Xin Xu, Zao Shen, Lian Yue, Dick K. P. |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Guo, Xin Xu, Zao Shen, Lian Yue, Dick K. P. |
| author_sort | Guo, Xin |
| collection | MIT |
| description | Turbulence in the upper ocean generates fluctuations in temperature and salinity, which result in variations in inherent optical properties (IOPs) and further change the underwater light field. A simulation-based study is performed for the radiative transfer (RT) of natural light in the turbulent flows in the upper ocean. For a canonical problem of turbulent shear flow interacting with the sea surface with and without surface waves, large-eddy simulations are performed for fluid motions and the transport of temperature and salinity. Based on the resolved turbulence temperature and salinity fields, IOP variations are quantified, and the inhomogeneous RT equation is then simulated using a Monte Carlo method. Through the simulations of a variety of cases with different flow, temperature, and salinity conditions, the statistics of downwelling irradiance are quantified and analyzed. It is found that the vertical profile of the mean downwelling irradiance is mainly determined by the vertical structure of the mean values of the IOPs; and turbulence effect is manifested in the horizontal variations of the downwelling irradiance. The magnitude of the irradiance variation is governed by the differences in the temperature and salinity between their values at the surface and in the deep region. In the presence of surface waves, the irradiance variation is enhanced due to the surface deformation, which is also largely affected by wave-turbulence interaction. The LES and inhomogeneous RT simulation may provide a useful tool for the characterization of upper-ocean turbulence processes based on underwater RT measurements. |
| first_indexed | 2024-09-23T12:02:38Z |
| format | Article |
| id | mit-1721.1/120314 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T12:02:38Z |
| publishDate | 2019 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/1203142022-09-27T23:44:23Z Radiative transfer in ocean turbulence and its effect on underwater light field Guo, Xin Xu, Zao Shen, Lian Yue, Dick K. P. Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Department of Ocean Engineering Xu, Zao Shen, Lian Yue, Dick K. P. Turbulence in the upper ocean generates fluctuations in temperature and salinity, which result in variations in inherent optical properties (IOPs) and further change the underwater light field. A simulation-based study is performed for the radiative transfer (RT) of natural light in the turbulent flows in the upper ocean. For a canonical problem of turbulent shear flow interacting with the sea surface with and without surface waves, large-eddy simulations are performed for fluid motions and the transport of temperature and salinity. Based on the resolved turbulence temperature and salinity fields, IOP variations are quantified, and the inhomogeneous RT equation is then simulated using a Monte Carlo method. Through the simulations of a variety of cases with different flow, temperature, and salinity conditions, the statistics of downwelling irradiance are quantified and analyzed. It is found that the vertical profile of the mean downwelling irradiance is mainly determined by the vertical structure of the mean values of the IOPs; and turbulence effect is manifested in the horizontal variations of the downwelling irradiance. The magnitude of the irradiance variation is governed by the differences in the temperature and salinity between their values at the surface and in the deep region. In the presence of surface waves, the irradiance variation is enhanced due to the surface deformation, which is also largely affected by wave-turbulence interaction. The LES and inhomogeneous RT simulation may provide a useful tool for the characterization of upper-ocean turbulence processes based on underwater RT measurements. United States. Office of Naval Research (Radiance in a Dynamic Ocean (RaDyO) project) United States. Department of Defense. High-Performance Computing Modernization Program 2019-02-11T15:33:40Z 2019-02-11T15:33:40Z 2012-03 2011-11 2019-01-15T18:03:28Z Article http://purl.org/eprint/type/JournalArticle 01480227 http://hdl.handle.net/1721.1/120314 Xu, Zao, Xin Guo, Lian Shen, and Dick K. P. Yue. “Radiative Transfer in Ocean Turbulence and Its Effect on Underwater Light Field.” Journal of Geophysical Research: Oceans 117, no. C7 (March 22, 2012): n/a–n/a. https://orcid.org/0000-0003-1273-9964 http://dx.doi.org/10.1029/2011JC007351 Journal of Geophysical Research: Oceans Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Geophysical Union (AGU) Other repository |
| spellingShingle | Guo, Xin Xu, Zao Shen, Lian Yue, Dick K. P. Radiative transfer in ocean turbulence and its effect on underwater light field |
| title | Radiative transfer in ocean turbulence and its effect on underwater light field |
| title_full | Radiative transfer in ocean turbulence and its effect on underwater light field |
| title_fullStr | Radiative transfer in ocean turbulence and its effect on underwater light field |
| title_full_unstemmed | Radiative transfer in ocean turbulence and its effect on underwater light field |
| title_short | Radiative transfer in ocean turbulence and its effect on underwater light field |
| title_sort | radiative transfer in ocean turbulence and its effect on underwater light field |
| url | http://hdl.handle.net/1721.1/120314 https://orcid.org/0000-0003-1273-9964 |
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