ECCO Version 4: Fifth Release (1992-2019) [ECCO v4r5]

These are the variables in the ECCO v4r5 output that can be accessed as monthly averages on the native LLC90 grid:

ShortName         Variable Name     Description (units)

ECCO_L4_ATM_SURFACE_TEMP_HUM_WIND_PRES_LLC0090GRID_MONTHLY_V4R5
                  EXFatemp          Surface (2 m) air temperature over open water. (degK)
                  EXFaqh            Surface (2 m) specific humidity over open water. (kg/kg)
                  EXFpress          Atmospheric pressure field at sea level. (N/m^2)
                  EXFuwind          Wind speed at 10m in the +x direction at the tracer cell on the native model grid. (m/s)
                  EXFvwind          Wind speed at 10m in the +y direction at the tracer cell on the native model grid. (m/s)
                  EXFwspee          10-m wind speed magnitude (>= 0 ) over open water. (m/s)

ECCO_L4_ICE_FRONT_FLUX_LLC0090GRID_MONTHLY_V4R5
                  ICFfwFlx          Ice front freshwater flux, +ve increases ocean salt. (kg/m^2/s)
                  ICFhtFlx          Ice front heat flux, +ve cools ocean. (W/m^2)

ECCO_L4_ICE_SHELF_FLUX_LLC0090GRID_MONTHLY_V4R5
                  SHIfwFlx          Ice shelf fresh water flux, positive upward. (kg/m^2/s)
                  SHIhtFlx          Ice shelf heat flux, positive upward. (W/m^2)

ECCO_L4_OCEAN_3D_MOMENTUM_ADV_TEND_X_LLC0090GRID_MONTHLY_V4R5
                  Um_AdvZ3          U momentum tendency from vorticity advection. (m/s^2)
                  Um_AdvRe          U momentum tendency from vertical advection, explicit part. (m/s^2)
                  Um_dKEdx          U momentum tendency from grad KE. (m/s^2)

ECCO_L4_OCEAN_3D_MOMENTUM_ADV_TEND_Y_LLC0090GRID_MONTHLY_V4R5
                  Vm_AdvZ3          V momentum tendency from vorticity advection. (m/s^2)
                  Vm_AdvRe          V momentum tendency from vertical advection, explicit part. (m/s^2)
                  Vm_dKEdy          V momentum tendency from grad KE. (m/s^2)

ECCO_L4_OCEAN_3D_MOMENTUM_DISS_TEND_X_LLC0090GRID_MONTHLY_V4R5
                  Um_Diss2          U momentum tendency from harmonic visc alone. (m/s^2)
                  Um_Diss4          U momentum tendency from biharmonic visc alone. (m/s^2)
                  UBotDrag          U momentum tendency from bottom drag. (m/s^2)
                  USidDrag          U momentum tendency from side drag. (m/s^2)
                  UShIDrag          U momentum tendency from friction/no-slip at base of shelf ice. (m/s^2)

ECCO_L4_OCEAN_3D_MOMENTUM_DISS_TEND_Y_LLC0090GRID_MONTHLY_V4R5
                  Vm_Diss2          V momentum tendency from harmonic visc alone. (m/s^2)
                  Vm_Diss4          V momentum tendency from biharmonic visc alone. (m/s^2)
                  VBotDrag          V momentum tendency from bottom drag. (m/s^2)
                  VSidDrag          V momentum tendency from side drag. (m/s^2)
                  VShIDrag          V momentum tendency from friction/no-slip at base of shelf ice. (m/s^2)

ECCO_L4_OCEAN_3D_MOMENTUM_TEND_X_LLC0090GRID_MONTHLY_V4R5
                  TOTUTEND          Tendency of zonal component of velocity. (m/s/day)
                  Um_Cori           U momentum tendency from Coriolis term. (m/s^2)
                  Um_Advec          U momentum tendency from advection terms. (m/s^2)
                  Um_Diss           U momentum tendency from dissipation, explicit part. (m/s^2)
                  Um_Ext            U momentum tendency from external forcing. (m/s^2)
                  Um_dPhiX          U momentum tendency from pressure/potential grad. (m/s^2)
                  AB_gU             U momentum tendency from Adams-Bashforth. (m/s^2)
                  Um_ImplD          U momentum tendency from dissipation, implicit part. (m/s^2)

ECCO_L4_OCEAN_3D_MOMENTUM_TEND_Y_LLC0090GRID_MONTHLY_V4R5
                  TOTVTEND          Tendency of meridional component of velocity. (m/s/day)
                  Vm_Cori           V momentum tendency from Coriolis term. (m/s^2)
                  Vm_Advec          V momentum tendency from advection terms. (m/s^2)
                  Vm_Diss           V momentum tendency from dissipation, explicit part. (m/s^2)
                  Vm_Ext            V momentum tendency from external forcing. (m/s^2)
                  Vm_dPhiY          V momentum tendency from pressure/potential grad. (m/s^2)
                  AB_gV             V momentum tendency from Adams-Bashforth. (m/s^2)
                  Vm_ImplD          V momentum tendency from dissipation, implicit part. (m/s^2)

ECCO_L4_OCEAN_AND_ICE_SURFACE_FW_FLUX_LLC0090GRID_MONTHLY_V4R5
                  EXFpreci          Precipitation rate. (m/s)
                  EXFevap           Evaporation rate per unit area of open water not covered by sea-ice. (m/s)
                  EXFroff           River runoff freshwater flux. (m/s)
                  EXFempmr          Net surface freshwater flux from precipitation, evaporation, and runoff per unit area in open water not covered by sea-ice. (m/s)
                  oceFWflx          Net freshwater flux into the ocean including contributions from runoff, evaporation, precipitation, and mass exchange with sea-ice due to melting and freezing and snow melting. (kg/m^2/s)
                  SIatmFW           Net freshwater flux into the combined liquid ocean, sea-ice, and snow reservoirs from the atmosphere and runoff. (kg/m^2/s)
                  SFLUX             The rate of change of total ocean salinity due to freshwater fluxes across the liquid surface and the addition or removal of mass. (kg/m^2/s)
                  SIfwThru          Precipitation over sea-ice covered regions reaching ocean through sea-ice. (kg/m^2/s)

ECCO_L4_OCEAN_AND_ICE_SURFACE_HEAT_FLUX_LLC0090GRID_MONTHLY_V4R5
                  EXFhl             Air-sea latent heat flux per unit area of open water not covered by sea-ice. (W/m^2)
                  EXFhs             Air-sea sensible heat flux per unit area of open water not covered by sea-ice. (W/m^2)
                  EXFlwdn           Downward longwave radiative flux. (W/m^2)
                  EXFlwnet          Net longwave radiative flux per unit area of open water not covered by sea-ice. (W/m^2)
                  EXFswdn           Downward shortwave radiative flux. (W/m^2)
                  EXFswnet          Net shortwave radiative flux per unit area of open water not covered by sea-ice. (W/m^2)
                  EXFqnet           Net air-sea heat flux (turbulent and radiative) per unit area of open water not covered by sea-ice. (W/m^2)
                  SIatmQnt          Net upward heat flux to the atmosphere across open water and sea-ice or snow surfaces. (W/m^2)
                  SIaaflux          Heat flux associated with the temperature difference between sea surface temperature and sea-ice (assume 0 degree C in the model). (W/m^2)
                  oceQnet           Net heat flux into the ocean surface from all processes: air-sea turbulent and radiative fluxes and turbulent and conductive fluxes between the ocean and sea-ice and snow. oceQnet does not include the change in ocean heat content due to changing ocean ocean mass, oceFWflx. (W/m^2)
                  oceQsw            Net shortwave radiative flux across the ocean surface. (W/m^2)
                  TFLUX             The rate of change of ocean heat content due to heat fluxes across the liquid surface and the addition or removal of mass. Unlike oceQnet, TFLUX includes the contribution to the ocean heat content from changing ocean mass, oceFWflx. (W/m^2)

ECCO_L4_OCEAN_AND_ICE_SURFACE_STRESS_LLC0090GRID_MONTHLY_V4R5
                  EXFtaux           Wind stress in the +x direction at the tracer cell on the native model grid. (N/m^2)
                  EXFtauy           Wind stress in the +y direction at the tracer cell on the native model grid. (N/m^2)
                  oceTAUX           Ocean surface stress due to wind and sea-ice in the +x direction centered over the 'u' side of the the native model grid. (N/m^2)
                  oceTAUY           Ocean surface stress due to wind and sea-ice in the +y direction centered over the 'v' side of the the native model grid. (N/m^2)

ECCO_L4_OCEAN_BOLUS_STREAMFUNCTION_LLC0090GRID_MONTHLY_V4R5
                  GM_PsiX           Gent-McWilliams bolus transport streamfunction 'u' component. (m^2/s)
                  GM_PsiY           Gent-McWilliams bolus transport streamfunction 'v' component. (m^2/s)

ECCO_L4_OCEAN_BOLUS_VELOCITY_LLC0090GRID_MONTHLY_V4R5
                  UVELSTAR          Gent-McWilliams parameterized bolus velocity in the model +x direction scaled by time-varying grid cell thickness (m/s)
                  VVELSTAR          Gent-McWilliams parameterized bolus velocity in the model +y direction scaled by time-varying grid cell thickness (m/s)
                  WVELSTAR          Gent-McWilliams parameterized bolus velocity in the model +z direction (m/s)

ECCO_L4_OCEAN_BOTTOM_PRESSURE_LLC0090GRID_MONTHLY_V4R5
                  OBP               Ocean bottom pressure, excluding global mean atmospheric pressure, given as equivalent water thickness. This is suitable for comparisons with GRACE data products. (m)
                  OBPGMAP           Ocean bottom pressure, includes global mean atmospheric pressure, given as equivalent water thickness. This is suitable for comparisons with ocean bottom pressure gauge data products. (m)
                  PHIBOT            Hydrostatic ocean bottom pressure potential anomaly, p_b/rhoConst - gH. PHIBOT is NOT corrected for global mean steric sea level changes related to density changes in the Boussinesq volume-conserving model sterGloH, and therefore should NOT be used for comparisons with ocean bottom pressure data. Instead, see OBPGMAP and OBP.  (m^2/s^2)

ECCO_L4_OCEAN_DENS_STRAT_PRESS_LLC0090GRID_MONTHLY_V4R5
                  RHOAnoma          In-situ seawater density anomaly relative to the reference density, rhoConst. rhoConst = 1029 kg/m^3. (kg/m^3)
                  DRHODR            Density stratification: d(sigma)/dz. Density computations are done with in-situ density. (kg/m^3/m)
                  PHIHYD            Ocean hydrostatic pressure anomaly, PHIHYD = p/rhoConst - gz*. PHIHYD is NOT corrected for global mean steric sea level changes related to density changes in the Boussinesq volume-conserving model sterGloH.  (m^2/s^2)
                  PHIHYDcR          Ocean hydrostatic pressure anomaly at constant z, PHIHYD = p/rhoConst - gz. PHIHYDcR is is NOT corrected for global mean steric sea level changes related to density changes in the Boussinesq volume-conserving model sterGloH.  (m^2/s^2)

ECCO_L4_OCEAN_MIXED_LAYER_DEPTH_LLC0090GRID_MONTHLY_V4R5
                  MXLDEPTH          Mixed-layer depth as determined by the depth where waters are first 0.8 degrees Celsius colder than the surface. (m)

ECCO_L4_OCEAN_SALINITY_FLUX_LLC0090GRID_MONTHLY_V4R5
                  ADVx_SLT          Lateral advective flux of salinity (SALT) in the +x direction through the 'u' face of the tracer cell on the native model grid. (1e-3 m^3/s)
                  DFxE_SLT          Lateral diffusive flux of salinity (SALT) in the +x direction through the 'u' face of the tracer cell on the native model grid. (1e-3 m^3/s)
                  ADVy_SLT          Lateral advective flux of salinity (SALT) in the +y direction through the 'v' face of the tracer cell on the native model grid. (1e-3 m^3/s)
                  DFyE_SLT          Lateral diffusive flux of salinity (SALT) in the +y direction through the 'v' face of the tracer cell on the native model grid. (1e-3 m^3/s)
                  ADVr_SLT          Vertical advective flux of salinity (SALT) in the +z direction through the top 'w' face of the tracer cell on the native model grid. (1e-3 m^3/s)
                  DFrE_SLT          The explicit term of the vertical diffusive flux of salinity (SALT) in the +z direction through the top 'w' face of the tracer cell on the native model grid. (1e-3 m^3/s)
                  DFrI_SLT          The implicit term of the vertical diffusive flux of salinity (SALT) in the +z direction through the top 'w' face of the tracer cell on the native model grid. (1e-3 m^3/s)
                  oceSPtnd          Salt tendency due to the vertical transport of salt in high-salinity brine plumes. (g/m^2/s)

ECCO_L4_OCEAN_TEMPERATURE_FLUX_LLC0090GRID_MONTHLY_V4R5
                  ADVx_TH           Lateral advective flux of potential temperature (THETA) in the +x direction through the 'u' face of the tracer cell on the native model grid. (degC m^3/s)
                  DFxE_TH           Lateral diffusive flux of potential temperature (THETA) in the +x direction through the 'u' face of the tracer cell on the native model grid. (degC m^3/s)
                  ADVy_TH           Lateral advective flux of potential temperature (THETA) in the +y direction through the 'v' face of the tracer cell on the native model grid. (degC m^3/s)
                  DFyE_TH           Lateral diffusive flux of potential temperature (THETA) in the +y direction through the 'v' face of the tracer cell on the native model grid. (degC m^3/s)
                  ADVr_TH           Vertical advective flux of potential temperature (THETA) in the +z direction through the top 'w' face of the tracer cell on the native model grid. (degC m^3/s)
                  DFrE_TH           The explicit term of the vertical diffusive flux of potential temperature (THETA) in the +z direction through the top 'w' face of the tracer cell on the native model grid. (degC m^3/s)
                  DFrI_TH           The implicit term of the vertical diffusive flux of potential temperature (THETA) in the +z direction through the top 'w' face of the tracer cell on the native model grid. (degC m^3/s)

ECCO_L4_OCEAN_TEMPERATURE_SALINITY_LLC0090GRID_MONTHLY_V4R5
                  THETA             Sea water potential temperature, i.e., the temperature a parcel of sea water would have if moved adiabatically to sea level pressure. (degC)
                  SALT              Sea water salinity. (1e-3, or parts per thousand)

ECCO_L4_OCEAN_VELOCITY_LLC0090GRID_MONTHLY_V4R5
Note: UVEL,VVEL should not be used in volume flux calculations due to time-variable grid cell thicknesses (z* coordinates). Use UVELMASS,VVELMASS instead.
                  UVEL              Horizontal velocity in the +x direction at the 'u' face of the tracer cell on the native model grid. (m/s)
                  VVEL              Horizontal velocity in the +y direction at the 'v' face of the tracer cell on the native model grid. (m/s)
                  WVEL              Vertical velocity in the +z direction at the top 'w' face of the tracer cell on the native model grid.(m/s)

ECCO_L4_OCEAN_VOLUME_FLUX_LLC0090GRID_MONTHLY_V4R5
                  UVELMASS          Horizontal velocity in the model +x direction averaged over the area of the tracer grid cell 'u' face on the native model grid. Use this in volume flux calculations as it is scaled to account for partial cells (hFacW < 1) and for time-varying grid cell thickness (z* coordinate system). (m/s)
                  VVELMASS          Horizontal velocity in the model +y direction averaged over the area of the tracer grid cell 'v' face on the native model grid. Use this in volume flux calculations as it is scaled to account for partial cells (hFacS < 1) and for time-varying grid cell thickness (z* coordinate system). (m/s)
                  WVELMASS          Vertical velocity in the +z direction at the top 'w' face of the tracer cell on the native model grid. Volume flux in +z = WVELMASS drA. As the open water fraction of the 'w' face is always 1, WVELMASS is identical to WVEL. (m/s)

ECCO_L4_SEA_ICE_CONC_THICKNESS_LLC0090GRID_MONTHLY_V4R5
                  SIarea            Fraction of ocean grid cell covered with sea-ice. (fraction between 0 and 1)
                  SIheff            Sea-ice thickness averaged over the entire model grid cell, including open water where sea-ice thickness is zero. (m)
                  SIhsnow           Snow thickness averaged over the entire model grid cell, including open water where snow thickness is zero. (m)
                  sIceLoad          Total mass of sea-ice and snow in a model grid cell averaged over model grid cell area. (kg/m^2)

ECCO_L4_SEA_ICE_HORIZ_VOLUME_FLUX_LLC0090GRID_MONTHLY_V4R5
                  ADVxHEFF          Lateral advective flux of grid cell mean sea-ice thickness (HEFF) in the +x direction through the 'u' face of the tracer cell on the native model grid. (m^3/s)
                  ADVyHEFF          Lateral advective flux of grid cell mean sea-ice thickness (HEFF) in the +y direction through the 'v' face of the tracer cell on the native model grid. (m^3/s)
                  ADVxSNOW          Lateral advective flux of grid cell mean snow thickness (HSNOW) in the +x direction through the 'u' face of the tracer cell on the native model grid. (m^3/s)
                  ADVySNOW          Lateral advective flux of grid cell mean snow thickness (HSNOW) in the +y direction through the 'v' face of the tracer cell on the native model grid. (m^3/s)

ECCO_L4_SEA_ICE_SALT_PLUME_FLUX_LLC0090GRID_MONTHLY_V4R5
                  oceSPflx          Net salt flux into the ocean due to brine rejection during sea-ice formation. (g/m^2/s)
                  oceSPDep          Depth of parameterized salt plumes formed due to brine rejection during sea-ice formation. (m)

ECCO_L4_SEA_ICE_THERMO_BUDG_LLC0090GRID_MONTHLY_V4R5
Note: these are the terms of the thermodynamic sea-ice model budget. Still need to determine what each term is.
                  SIFao              ()
                  SIFionet           ()
                  SIFianet           ()
                  SIFmi              ()
                  SIFFlood           ()
                  SIsnAccR           ()
                  SIsnmltS           ()
                  SIgamma            ()

ECCO_L4_SEA_ICE_VELOCITY_LLC0090GRID_MONTHLY_V4R5
                  SIuice            Horizontal sea-ice velocity in the +x direction at the 'u' face of the tracer cell on the native model grid. (m/s)
                  SIvice            Horizontal sea-ice velocity in the +y direction at the 'v' face of the tracer cell on the native model grid. (m/s)

ECCO_L4_SEA_SURFACE_HEIGHT_LLC0090GRID_MONTHLY_V4R5
                  SSH               Dynamic sea surface height, also known as ocean dynamic sea level.  The local height of the sea surface above the geoid plus a correction due to atmosphere pressure loading, the inverse barometer (IB) correction. SSH is suitable for comparisons with altimetry sea surface height data products that apply the IB correction. (m)
                  SSHNOIBC          The local height of the sea surface relative to the geoid. SSHNOIBC does not include the inverted barometer (IB) correction, and is suitable for comparisons with altimetry sea surface height data products that do NOT apply the inverse barometer (IB) correction. (m)
                  SSHIBC            The static displacement of the sea surface due to atmosphere pressure loading, known as the inverse barometer (IB) correction. (m)
                  ETAN              Model sea level anomaly, without corrections for global mean density (steric) changes, inverted barometer effect, or volume displacement due to submerged sea-ice and snow. (m)
