The exact column name as it appeared in the raw file before any cleaning.A common or understandable name for the variable.The physical units associated with the variable (e.g., m, PSU, °C).The description supplied by the original data provider explaining what the variable represents.The medium from which the measurement was taken (e.g., water, air, sediment). Extracted from the header or assigned manually.Whether the value is a direct measurement or a calculated value.Any notes about how the variable was processed or derived.Extracted from the header or assigned manually. latLatitudedegrees north (°N)Geographic latitude of the sampling locationIce Coreactual longLongitudedegrees west (°W)Geographic longitude of the sampling location.Ice Coreactual siteSiteIdentifier for the sampling siteIce Coreactual sampleSampleSample IDIce Coreactual cycleCycleSampling CycleIce Coreactual dateDaySampling DayIce Coreactual monthMonthSampling MonthIce Coreactual yearYearSampling YearIce Coreactual chl_mg_m2Chlorophyll-a per unit areamg m⁻²Integrated chlorophyll‑a concentration per unit area, representing ice‑algal biomass within the ice column.Ice Coreactual chl_ug_lChlorophyll-a per unit volumeµg L⁻¹Chlorophyll‑a concentration in water samples, indicating algal biomass.Ice Coreactual noxNitrite + Nitrateµmol L⁻¹Combined concentration of nitrate (NO₃⁻) and nitrite (NO₂⁻), representing oxidized inorganic nitrogen.Ice Coreactual no3Nitrateµmol L⁻¹Concentration of nitrateIce Coreactual no2Nitriteµmol L⁻¹Concentration of nitriteIce Coreactual po4Phosphateµmol L⁻¹Concentration of dissolved inorganic phosphateIce Coreactual sio4Silicateµmol L⁻¹Concentration of dissolved silicateIce Coreactual distance_kmDistancekmIce Coreactual poc_uglParticulate Organic Carbonµmol L⁻¹Concentration of particulate organic carbonIce Coreactual pon_uglParticulate Organic Nitrogenµmol L⁻¹Concentration of particulate organic nitrogen.Ice Coreactual salinitySalinityNo unitPractical salinity of melted sea ice or under‑ice water.Ice Coreactual intra_noxIntracellular NOxµmol L⁻¹Ice Corecalculated intra_siIntracellular Silicic Acidµmol L⁻¹Ice Corecalculated intra_po4Intracellular Phosphateµmol L⁻¹Ice Corecalculated snow_depth_cmSnow DepthcmDepth of snow overlying the sea ice at the sampling site.Ice Coreactual ice_thickness_cmIce ThicknesscmTotal thickness of the sea‑ice column at the sampling site.Ice Coreactual nitrogen_demandNitrogen Demandmmol m-2 d-1Estimated nitrogen requirement for ice‑algal production, based on biomass or growth rate calculations.Ice Corecalculated bottom_depthBottom DepthmThe depth of the ice-water interface below the snow surface.Ice Coreactual