Energetics of Eddy-Mean Flow Interactions in the Amery Ice Shelf Cavity
Open Access
- 14 June 2021
- journal article
- research article
- Published by Frontiers Media SA in Frontiers in Marine Science
Abstract
Previous studies demonstrated that eddy processes play an important role in ice shelf basal melting and the water mass properties of ice shelf cavities. However, the eddy energy generation and dissipation mechanisms in ice shelf cavities have not been studied systematically. The dynamic processes of the ocean circulation in the Amery Ice Shelf cavity are studied quantitatively through a Lorenz energy cycle approach for the first time by using the outputs of a high-resolution coupled regional ocean-sea ice-ice shelf model. Over the entire sub-ice-shelf cavity, mean available potential energy (MAPE) is the largest energy reservoir (112 TJ), followed by the mean kinetic energy (MKE, 70 TJ) and eddy available potential energy (EAPE, 10 TJ). The eddy kinetic energy (EKE) is the smallest pool (5.5 TJ), which is roughly 8% of the MKE, indicating significantly suppressed eddy activities by the drag stresses at ice shelf base and bottom topography. The total generation rate of available potential energy is about 1.0 GW, almost all of which is generated by basal melting and seawater refreezing, i.e., the so-called “ice pump.” The energy generated by ice pump is mainly dissipated by the ocean-ice shelf and ocean-bottom drag stresses, amounting to 0.3 GW and 0.2 GW, respectively. The EKE is generated through two pathways: the barotropic pathway MAPE→MKE→EKE (0.03 GW) and the baroclinic pathway MAPE→EAPE→EKE (0.2 GW). In addition to directly supplying the EAPE through baroclinic pathway (0.2 GW), MAPE also provides 0.5 GW of power to MKE to facilitate the barotropic pathway.Keywords
Funding Information
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
This publication has 100 references indexed in Scilit:
- Antarctic ice-sheet loss driven by basal melting of ice shelvesNature, 2012
- ENERGETICS OF CLIMATE MODELS: NET ENERGY BALANCE AND MERIDIONAL ENTHALPY TRANSPORTReviews of Geophysics, 2011
- Recent loss of floating ice and the consequent sea level contributionGeophysical Research Letters, 2010
- Surface oceanography of BROKE-West, along the Antarctic margin of the south-west Indian Ocean (30–80∘E)Deep Sea Research Part II: Topical Studies in Oceanography, 2010
- Decadal variability of wind-energy input to the world oceanDeep Sea Research Part II: Topical Studies in Oceanography, 2006
- Available potential energy in the world's oceansJournal of Marine Research, 2005
- The Role of Meltwater Advection in the Formulation of Conservative Boundary Conditions at an Ice–Ocean InterfaceJournal of Physical Oceanography, 2001
- Modeling the effects of frazil ice crystals on the dynamics and thermodynamics of Ice Shelf Water plumesJournal of Geophysical Research: Oceans, 1995
- Oceanic vertical mixing: A review and a model with a nonlocal boundary layer parameterizationReviews of Geophysics, 1994
- Estimates of the energy cycle of the oceansJournal of Geophysical Research: Oceans, 1994