Reconciling estimates of the ratio of heat and salt fluxes at the ice-ocean interface
| Autor: | Keitzl, Thomas, Mellado González, Juan Pedro, Notz, Dirk |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Física |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Ocean
Física [Àrees temàtiques de la UPC] Atmospheric physics Ocean-atmosphere interaction mar Ice--Thermal properties Turbulent boundary layer Capa límit (Meteorologia) Ice-ocean interface Física atmosfèrica interface heat and salt fluxes Ocean--Thermal properties Physics::Atmospheric and Oceanic Physics Direct numerical simulation |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| DOI: | 10.1002/2016JC012018 |
| Popis: | The heat exchange between floating ice and the underlying ocean is determined by the interplay of diffusive fluxes directly at the ice–ocean interface and turbulent fluxes away from it. In this study, we examine this interplay through direct numerical simulations of free convection. Our results show that an estimation of the interface flux ratio based on direct measurements of the turbulent fluxes can be difficult because the flux ratio varies with depth. As an alternative, we present a consistent evaluation of the flux ratio based on the total heat and salt fluxes across the boundary layer. This approach allows us to reconcile previous estimates of the ice–ocean interface conditions. We find that the ratio of heat and salt fluxes directly at the interface is 83–100 rather than 33 as determined by previous turbulence measurements in the outer layer. This can cause errors in the estimated ice-ablation rate from field measurements of up to 40% if they are based on the three-equation formulation. |
| Databáze: | OpenAIRE |
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