SASSIE ECCO Version 1: First Release (January 15, 2014 to February 7, 2021) These are the variables in the SASSIE ECCO v1r1 output that can be downloaded as daily averages and monthly snapshots on the native LLC1080 grid: ShortName Variable Name Description (units) SASSIE_ECCO_L4_OBP_SSH_LLC1080GRID_DAILY_V1R1 ETAN Model sea level anomaly, without corrections for global mean density changes, inverted barometer effect, or volume displacement due to submerged sea-ice and snow (m) PHIBOT Ocean hydrostatic bottom pressure anomaly (m^2/s^2) SASSIE_ECCO_L4_ATM_STATE_LLC1080GRID_DAILY_V1R1 EXFatemp Atmosphere surface (2 m) air temperature (degK) EXFaqh Atmosphere surface (2 m) specific humidity (kg/kg) EXFuwind Wind speed at 10m in the model +x direction (m/s) EXFvwind Wind speed at 10m in the model +y direction (m/s) SASSIE_ECCO_L4_STRESS_LLC1080GRID_DAILY_V1R1 EXFtaux Wind stress in the model +x direction (N/m^2) EXFtauy Wind stress in the model +y direction (N/m^2) oceTAUX Ocean surface stress in the model +x direction, due to wind and sea-ice (N/m^2) oceTAUY Ocean surface stress in the model +y direction, due to wind and sea-ice (N/m^2) SASSIE_ECCO_L4_HEAT_FLUX_LLC1080GRID_DAILY_V1R1 EXFhl Open ocean air-sea latent heat flux, >0 increases theta (W/m^2) EXFhs Open ocean air-sea sensible heat flux, >0 increases theta (W/m^2) EXFlwdn Downward longwave radiative flux, >0 increases theta (W/m^2) EXFswdn Downwelling shortwave radiative flux, >0 increases theta (W/m^2) EXFqnet Open ocean net air-sea heat flux, >0 decreases theta (W/m^2) oceQnet Net heat flux into the ocean surface, >0 increases theta (W/m^2) SIatmQnt Net upward heat flux to the atmosphere, >0 decreases theta (W/m^2) TFLUX Rate of change of ocean heat content per m^2 accounting for mass (e.g. freshwater) fluxes, >0 increases theta (W/m^2) EXFswnet Open ocean net shortwave radiative flux, >0 decreases theta (W/m^2) EXFlwnet Net open ocean longwave radiative flux, >0 decreases theta (W/m^2) oceQsw Net shortwave radiative flux across the ocean surface, >0 increases theta (W/m^2) WTHMASS Vertical Mass-Weight Transport of Potential Temperature (degK m/s)) SIqnet Ocean surface heat flux (turbulent and radiative) (W/m^2) SIqsw Ocean surface shortwave radiation (W/m^2) SItflux Rate of change of ocean heat content per m2 accounting for mass fluxes, including sea ice (W/m^2) SIqneto Open ocean part of ocean surface heat flux (SIqnet) (W/m^2) SIqneti Ice covered part of ocean surface heat flux (SIqnet) (W/m^2) SASSIE_ECCO_L4_FRESH_FLUX_LLC1080GRID_DAILY_V1R1 EXFpreci Precipitation rate, >0 decreases salinity (m/s) EXFevap Open ocean evaporation rate, >0 increases salinity (m/s) EXFroff River runoff, >0 decreases salinity (m/s) EXFempmr Open ocean net surface freshwater flux from precipitation, evaporation, and runoff, >0 increases salinity (m/s) oceFWflx Net freshwater flux into the ocean, >0 decreases salinity (kg/(m^2 s)) SIatmFW Net freshwater flux from atmosphere & land (kg/(m^2 s)) SFLUX Rate of change of total ocean salinity per m^2 accounting for mass fluxes, >0 increases salinity (g/(m^2 s)) WSLTMASS Vertical Mass-Weight Transport of Salinity (g/kg m/s)) SIfwSubl Potential sublimation freshwater flux (kg/m^2/s) SIacSubl Actual sublimation freshwater flux (kg/m^2/s) SIrsSubl Residual sublimation freshwater flux (kg/m^2/s) SASSIE_ECCO_L4_SEA_ICE_CONC_THICK_VEL_LLC1080GRID_DAILY_V1R1 SIarea Sea-ice concentration (fraction between 0 and 1) SIheff Area-averaged sea-ice thickness (m) SIhsnow Area-averaged snow thickness (m) sIceLoad Average sea-ice and snow mass per unit area (kg/m^2) SIuice Sea-ice velocity in the model +x direction (m/s) SIvice Sea-ice velocity in the model +y direction (m/s) SASSIE_ECCO_L4_SEA_ICE_VOL_AREA_FLUX_LLC1080GRID_DAILY_V1R1 ADVxHEFF Lateral advective flux of sea-ice thickness in the model +x direction (m^3/s) ADVyHEFF Lateral advective flux of sea-ice thickness in the model +y direction (m^3/s) ADVxSNOW Lateral advective flux of snow thickness in the model +x direction (m^3/s) ADVySNOW Lateral advective flux of snow thickness in the model +y direction (m^3/s) ADVxAREA Lateral advective flux of sea-ice area in the model +x direction (m^2/m^2 m^2/s) ADVyAREA Lateral advective flux of sea-ice area in the model +y direction (m^2/m^2 m^2/s) SASSIE_ECCO_L4_SEA_ICE_VOL_AREA_TEND_LLC1080GRID_DAILY_V1R1 SIdAbATO Potential sea ice concentration rate of change by open ocean atmospheric flux (m^2/m^2/s) SIdAbATC Potential sea ice concentration rate of change by atmospheric flux over ice (m^2/m^2/s) SIdAbOCN Potential sea ice concentration rate of change by ocean-ice flux (m^2/m^2/s) SIdA Net sea ice concentration rate of change (m^2/m^2/s) SIheffPT Area-averaged sea-ice thickness (SIheff) preceeeding thermodynamic growth/melt (m) SIhsnoPT Area-averaged snow thickness (SIhsnow) preceeeding thermodynamic growth/melt (m) SASSIE_ECCO_L4_KPP_BOUNDARY_LAYER_LLC1080GRID_DAILY_V1R1 KPPhbl KPP boundary layer depth, bulk Ri criterion (m) SASSIE_ECCO_L4_OCN_VEL_LLC1080GRID_DAILY_V1R1 UVEL Horizontal velocity in the model +x direction (m/s) VVEL Horizontal velocity in the model +y direction (m/s) WVEL Vertical velocity (m/s) SASSIE_ECCO_L4_TEMP_SALINITY_LLC1080GRID_DAILY_V1R1 THETA Potential temperature, i.e., temperature of water parcel at sea level pressure (degC) SALT Salinity (1e-3, or parts per thousand) SASSIE_ECCO_L4_DENS_PRESS_LLC1080GRID_DAILY_V1R1 RHOAnoma In-situ seawater density anomaly (kg/m^3) PHIHYD Ocean hydrostatic pressure anomaly (m^2/s^2) SASSIE_ECCO_L4_OCN_3D_VOL_FLUX_LLC1080GRID_DAILY_V1R1 UVELMASS Horizontal velocity in the model +x direction per unit area of the grid cell \'u\' face (m/s) VVELMASS Horizontal velocity in the model +y direction per unit area of the grid cell \'v\' face (m/s) WVELMASS Grid cell face-averaged vertical velocity in the model +z direction (m/s) SASSIE_ECCO_L4_OCN_3D_TEMP_ADV_FLUX_LLC1080GRID_DAILY_V1R1 ADVx_TH Lateral advective flux of potential temperature in the model +x direction (degC m^3/s) ADVy_TH Lateral advective flux of potential temperature in the model +y direction (degC m^3/s) ADVr_TH Vertical advective flux of potential temperature (degC m^3/s) SASSIE_ECCO_L4_OCN_3D_TEMP_DIFF_FLUX_LLC1080GRID_DAILY_V1R1 DFrI_TH Vertical diffusive flux of potential temperature, implicit term (degC m^3/s) KPPg_TH KPP non-local flux of potential temperature (degC m^3/s) SASSIE_ECCO_L4_OCN_3D_SALINITY_ADV_FLUX_LLC1080GRID_DAILY_V1R1 ADVx_SLT Lateral advective flux of salinity in the model +x direction (1e-3 m^3/s) ADVy_SLT Lateral advective flux of salinity in the model +y direction (1e-3 m^3/s) ADVr_SLT Vertical advective flux of salinity (1e-3 m^3/s) SASSIE_ECCO_L4_OCN_3D_SALINITY_DIFF_FLUX_LLC1080GRID_DAILY_V1R1 DFrI_SLT Vertical diffusive flux of salinity, implicit term (1e-3 m^3/s) KPPg_SLT KPP non-local flux of salinity (g/kg m^3/s) SASSIE_ECCO_L4_KPP_DIAGS_LLC1080GRID_DAILY_V1R1 KPPdiffS Vertical diffusion coefficient for salt & tracers (m^2/s) KPPviscA KPP vertical eddy viscosity coefficient (m^2/s) KPPghatK Ratio of KPP non-local (salt) flux relative to surface-flux (unitless) KPPRi Bulk Richardson number (unitless) KPPdVsq Shear relative to surface (V(ksrf)-V(k))**2 (m^2/s^2) SASSIE_ECCO_L4_OBP_SSH_LLC1080GRID_SNAPSHOT_V1R1 ETAN Model sea level anomaly, without corrections for global mean density changes, inverted barometer effect, or volume displacement due to submerged sea-ice and snow (m) PHIBOT Ocean hydrostatic bottom pressure anomaly (m^2/s^2) SASSIE_ECCO_L4_SEA_ICE_CONC_THICK_VEL_LLC1080GRID_SNAPSHOT_V1R1 SIarea Sea-ice concentration (fraction between 0 and 1) SIheff Area-averaged sea-ice thickness (m) SIhsnow Area-averaged snow thickness (m) sIceLoad Average sea-ice and snow mass per unit area (kg/m^2) SIuice Sea-ice velocity in the model +x direction (m/s) SIvice Sea-ice velocity in the model +y direction (m/s) SASSIE_ECCO_L4_TEMP_SALINITY_LLC1080GRID_SNAPSHOT_V1R1 THETA Potential temperature, i.e., temperature of water parcel at sea level pressure (degC) SALT Salinity (1e-3, or parts per thousand) SASSIE_ECCO_L4_GEOMETRY_LLC1080GRID_V1R1 CS Cosine of tracer grid cell orientation vs geographical north SN Sine of tracer grid cell orientation vs geographical north rAc Area of tracer grid cell (m^2) dxG Distance between 'southwest' and 'southeast' corners of the tracer grid cell (m) dyG Distance between 'southwest' and 'northwest' corners of the tracer grid cell (m) Depth Model seafloor depth below ocean surface at rest (m) rAz Area of vorticity 'g' grid cell (m^2) dxC Distance between centers of adjacent tracer grid cells in the 'x' direction (m) dyC Distance between centers of adjacent tracer grid cells in the 'y' direction (m) rAw Area of 'v' grid cell (m^2) rAs Area of 'u' grid cell (m^2) drC Distance between the centers of adjacent tracer grid cells in the 'z' direction (m) drF Distance between the upper and lower interfaces of the model grid cell (m) PHrefC Reference ocean hydrostatic pressure at tracer grid cell center (m^2/s^2) PHrefF Reference ocean hydrostatic pressure at tracer grid cell top/bottom interface (m^2/s^2) hFacC Vertical open fraction of tracer grid cell hFacW Vertical open fraction of tracer grid cell 'west' face hFacS Vertical open fraction of tracer grid cell 'south' face maskC Wet/dry boolean mask for tracer grid cell maskW Wet/dry boolean mask for 'west' face of tracer grid cell maskS Wet/dry boolean mask for 'south' face of tracer grid cell mask_basin 0/1 land-ocean mask with filled wet grid cells that are not connected to ocean