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Article Dans Une Revue Geophysical Research Letters Année : 2019

Fast Warming of the Surface Ocean Under a Climatological Scenario

Q. Jamet
W. K Dewar
  • Fonction : Auteur
N. Wienders

Résumé

Key Points: 6 • Weakly varying climatological winds reduce upper ocean vertical mixing, affect-7 ing the redistribution of air-sea fluxes 8 • Coupled to an atmospheric boundary layer, the modeled ocean response to clima-9 tological winds is to warm up considerably at the surface 10 • Results illustrate the pivotal improvements in air-sea interactions achieved by driv-11 ing an ocean model with an atmospheric boundary layer 12 Abstract 13 We examine various strategies for forcing ocean-only models, including an atmospheric 14 boundary layer model. This surface forcing allows air-sea exchanges to affect atmospheric 15 temperature and relative humidity, thus removing the assumption of an infinite atmo-16 spheric heat capacity associated with the prescription of these variables. When exposed 17 to climatological winds, the simulated North Atlantic oceanic temperature warms con-18 siderably at the surface as compared to a model with full atmospheric variability. This 19 warming is mainly explained by a weakened upper ocean vertical mixing in response to 20 the weakly varying climatological winds. Specifying the atmospheric temperatures in-21 hibits this warming, but depends on the unrealistic large atmospheric heat capacity. We 22 thus interpret the simulated warmer ocean as a more physically consistent ocean response. 23 We conclude the use of an atmospheric boundary layer model provides many benefits 24 for ocean only modeling, although a 'normal' year strategy is required for maintaining 25 high frequency winds. 26

Domaines

Océanographie
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Dates et versions

hal-02410290 , version 1 (13-12-2019)

Identifiants

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Q. Jamet, W. K Dewar, N. Wienders, B. Deremble. Fast Warming of the Surface Ocean Under a Climatological Scenario. Geophysical Research Letters, 2019, 46 (7), pp.3871-3879. ⟨10.1029/2019GL082336⟩. ⟨hal-02410290⟩
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