Role of Surface Gravity Waves in Aquaplanet Ocean Climates
We present a set of idealised numerical experiments of a solstitial aquaplanet ocean and examine the thermodynamic and dynamic implications of surface gravity waves (SGWs) upon its mean state. The aquaplanet's oceanic circulation is dominated by an equatorial zonal jet and four Ekman driven mer...
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ftdatacite:10.48550/arxiv.2106.05032 2023-05-15T18:25:43+02:00 Role of Surface Gravity Waves in Aquaplanet Ocean Climates Studholme, Joshua Markina, Margarita Gulev, Sergey 2021 https://dx.doi.org/10.48550/arxiv.2106.05032 https://arxiv.org/abs/2106.05032 unknown arXiv https://dx.doi.org/10.1029/2020ms002202 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Atmospheric and Oceanic Physics physics.ao-ph Earth and Planetary Astrophysics astro-ph.EP Fluid Dynamics physics.flu-dyn Geophysics physics.geo-ph FOS Physical sciences article-journal Article ScholarlyArticle Text 2021 ftdatacite https://doi.org/10.48550/arxiv.2106.05032 https://doi.org/10.1029/2020ms002202 2022-03-10T13:54:43Z We present a set of idealised numerical experiments of a solstitial aquaplanet ocean and examine the thermodynamic and dynamic implications of surface gravity waves (SGWs) upon its mean state. The aquaplanet's oceanic circulation is dominated by an equatorial zonal jet and four Ekman driven meridional overturning circulation (MOC) cells aligned with the westerly atmospheric jet streams and easterly trade winds in both hemispheres. Including SGW parameterization (representing modulations of air-sea momentum fluxes, Langmuir circulation and Stokes-Coriolis force) increases mixed layer vertical momentum diffusivity by approx. 40% and dampens surface momentum fluxes by approx. 4%. The correspondingly dampened MOC impacts the oceanic density structure to 1 km depth by lessening the large-scale advective transports of heat and salt, freshening the equatorial latitudes (where evaporation minus precipitation [E-P] is negative) and increasing salinity in the subtropics (where E-P is positive) by approx. 1%. The midlatitude pycnocline in both hemispheres is deepened by the inclusion of SGWs. Including SGWs into the aquaplanet ocean model acts to increase mixed layer depth by approx. 10% (up to 20% in the wintertime in midlatitudes), decrease vertical shear in the upper 200 m and alter local midlatitude buoyancy frequency. Generally, the impacts of SGWs upon the aquaplanet ocean are found to be consistent across cooler and warmer climates. We suggest that the implications of these simulations could be relevant to understanding future projections of SGW climate, exoplanetary oceans, and the dynamics of the Southern Ocean mixed layer. Article in Journal/Newspaper Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Langmuir ENVELOPE(-67.150,-67.150,-66.967,-66.967) Southern Ocean |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Atmospheric and Oceanic Physics physics.ao-ph Earth and Planetary Astrophysics astro-ph.EP Fluid Dynamics physics.flu-dyn Geophysics physics.geo-ph FOS Physical sciences |
spellingShingle |
Atmospheric and Oceanic Physics physics.ao-ph Earth and Planetary Astrophysics astro-ph.EP Fluid Dynamics physics.flu-dyn Geophysics physics.geo-ph FOS Physical sciences Studholme, Joshua Markina, Margarita Gulev, Sergey Role of Surface Gravity Waves in Aquaplanet Ocean Climates |
topic_facet |
Atmospheric and Oceanic Physics physics.ao-ph Earth and Planetary Astrophysics astro-ph.EP Fluid Dynamics physics.flu-dyn Geophysics physics.geo-ph FOS Physical sciences |
description |
We present a set of idealised numerical experiments of a solstitial aquaplanet ocean and examine the thermodynamic and dynamic implications of surface gravity waves (SGWs) upon its mean state. The aquaplanet's oceanic circulation is dominated by an equatorial zonal jet and four Ekman driven meridional overturning circulation (MOC) cells aligned with the westerly atmospheric jet streams and easterly trade winds in both hemispheres. Including SGW parameterization (representing modulations of air-sea momentum fluxes, Langmuir circulation and Stokes-Coriolis force) increases mixed layer vertical momentum diffusivity by approx. 40% and dampens surface momentum fluxes by approx. 4%. The correspondingly dampened MOC impacts the oceanic density structure to 1 km depth by lessening the large-scale advective transports of heat and salt, freshening the equatorial latitudes (where evaporation minus precipitation [E-P] is negative) and increasing salinity in the subtropics (where E-P is positive) by approx. 1%. The midlatitude pycnocline in both hemispheres is deepened by the inclusion of SGWs. Including SGWs into the aquaplanet ocean model acts to increase mixed layer depth by approx. 10% (up to 20% in the wintertime in midlatitudes), decrease vertical shear in the upper 200 m and alter local midlatitude buoyancy frequency. Generally, the impacts of SGWs upon the aquaplanet ocean are found to be consistent across cooler and warmer climates. We suggest that the implications of these simulations could be relevant to understanding future projections of SGW climate, exoplanetary oceans, and the dynamics of the Southern Ocean mixed layer. |
format |
Article in Journal/Newspaper |
author |
Studholme, Joshua Markina, Margarita Gulev, Sergey |
author_facet |
Studholme, Joshua Markina, Margarita Gulev, Sergey |
author_sort |
Studholme, Joshua |
title |
Role of Surface Gravity Waves in Aquaplanet Ocean Climates |
title_short |
Role of Surface Gravity Waves in Aquaplanet Ocean Climates |
title_full |
Role of Surface Gravity Waves in Aquaplanet Ocean Climates |
title_fullStr |
Role of Surface Gravity Waves in Aquaplanet Ocean Climates |
title_full_unstemmed |
Role of Surface Gravity Waves in Aquaplanet Ocean Climates |
title_sort |
role of surface gravity waves in aquaplanet ocean climates |
publisher |
arXiv |
publishDate |
2021 |
url |
https://dx.doi.org/10.48550/arxiv.2106.05032 https://arxiv.org/abs/2106.05032 |
long_lat |
ENVELOPE(-67.150,-67.150,-66.967,-66.967) |
geographic |
Langmuir Southern Ocean |
geographic_facet |
Langmuir Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://dx.doi.org/10.1029/2020ms002202 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.2106.05032 https://doi.org/10.1029/2020ms002202 |
_version_ |
1766207347833700352 |