FN Archimer Export Format
PT J
TI Potential Vorticity diagnostics based on balances between volume integral and boundary conditions
BT 
AF Morel, Yves
   Gula, Jonathan
   Ponte, Aurelien
AS 1:1;2:3;3:2;
FF 1:;2:;3:PDG-ODE-LOPS-OH;
C1 LEGOS, Université de Toulouse, CNES, CNRS, IRD, UPS, Toulouse 31400, France
   LOPS, Université de Brest, CNRS, Ifremer, IRD, IUEM, Brest 29280, France
   LOPS, Université de Brest, CNRS, Ifremer, IRD, IUEM, Brest 29280, France
C2 OBSERV MIDI PYRENEES, FRANCE
   IFREMER, FRANCE
   UBO, FRANCE
SI BREST
SE PDG-ODE-LOPS-OH
UM LOPS
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 3.215
TC 14
UR https://archimer.ifremer.fr/doc/00494/60525/63988.pdf
LA English
DT Article
DE ;Potential vorticity;Boundary conditions;General circulation;Vortex;Fronts;Boundary layers
AB Taking advantage of alternative expressions for potential vorticity (PV) in divergence forms, we derive balances between volume integral of PV and boundary conditions, that are then applied to practical computations of PV: • we propose a new method for diagnosing the Ertel potential vorticity from model output, that preserves the balances; • we show how the expression of PV can be derived in general coordinate systems. This is here emphasised with isopycnic coordinates by generalising the PV expression to the general Navier-Stokes equations; • we propose a generalised derivation for the Haynes-McIntyre impermeability theorem, which highlights the role of the bottom boundary condition choice (e.g. no-slip vs free-slip) and mixing near the bottom boundary for the volume integral of PV. The implications of balances between volume integral of PV and boundary conditions are then analysed for specific processes at various scales: • at large scale, we show how an integral involving surface observations (derived from satellite observations) is linked to the integral of PV within a layer (between two isopycnals). This surface integral can be calculated for models and observations and can be used for validation; • at mesoscale or sub-mesoscale, we analyse the relationship between net PV anomalies and net surface density anomalies for idealised vortices and 2D fronts. This can help determining vortex or jet structures for idealised studies or empirical methodologies; • we also confirm and integrate previous results on the modification of PV within a bottom boundary layer into a single diagnostic taking into account the effect of density and velocity modifications by diabatic processes along the topography and diapycnal mixing within the boundary layer. 
PY 2019
PD JUL
SO Ocean Modelling
SN 1463-5003
PU Elsevier BV
VL 138
UT 000472819600003
BP 23
EP 35
DI 10.1016/j.ocemod.2019.04.004
ID 60525
ER

EF