Ventilation of the Arabian Sea Oxygen Minimum Zone by Persian Gulf Water
Rattachement africain : se, Afrique du Sud, om, gb. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Dense overflows from marginal seas are critical pathways of oxygen supply to the Arabian Sea Oxygen Minimum Zone (OMZ), yet these remain inadequately understood. Climate models struggle to accurately reproduce the observed extent and intensity of the Arabian Sea OMZ due to their limited ability to capture processes smaller than their grid scale, such as dense overflows. Multi-month repeated sections by underwater gliders off the coast of Oman resolve the contribution of dense Persian Gulf Water (PGW) outflow to oxygen supply within the Arabian Sea OMZ. We characterize PGW properties, seasonality, transport and mixing mechanisms to explain local processes influencing water mass transformation and oxygen fluxes into the OMZ. Atmospheric forcing at the source region and eddy mesoscale activity in the Gulf of Oman control spatiotemporal variability of PGW as it flows along the shelf of the northern Omani coast. Subseasonally, it is modulated by stirring and shear-driven mixing driven by eddy-topography interactions. The oxygen transport from PGW to the OMZ is estimated to be 1.3 Tmol yr -1 over the observational period, with dramatic inter- and intra-annual variability (±1.6 Tmol yr -1 ). We show that this oxygen is supplied to the interior of the OMZ through the combined action of double-diffusive and shear-driven mixing. Intermittent shear-driven mixing enhances double-diffusive processes, with mechanical shear conditions (Ri<0.25) prevailing 14% of the time at the oxycline. These findings enhance our understanding of fine-scale processes influencing oxygen dynamics within the OMZ that can provide insights for improved modeling and prediction efforts.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Ventilation of the Arabian Sea Oxygen Minimum Zone by Persian Gulf Water
- Date Crossref
- 08/02/2024
- Éditeur
- Wiley
- Type
- posted-content
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Gothenburg Department of Marine Sciences pays non établi dans la noticeUniversité ou école supérieure
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University of Cape Town Department of Oceanography University of Cape Town, Afrique du Sud (code pays fourni par la source)Université ou école supérieure
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Sultan Qaboos University Department of Marine Science and Fisheries pays non établi dans la noticeUniversité ou école supérieure
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University of East Anglia pays non établi dans la noticeUniversité ou école supérieure
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School of Environmental Science Centre for Ocean and Atmospheric Sciences pays non établi dans la noticeUniversité ou école supérieure
Department of Marine Sciences — University of Gothenburg, Department of Oceanography — University of Cape Town (University of Cape Town, Afrique du Sud) et Department of Marine Science and Fisheries — Sultan Qaboos University, avec 2 autres affiliations. Pays d’affiliation : Afrique du Sud.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.