_id Original Header Common Name Units Data Provider Description media_type result_value_type Notes 1 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. 2 lat Latitude degrees north (°N) Geographic latitude of the sampling location Ice Core actual 3 long Longitude degrees west (°W) Geographic longitude of the sampling location. Ice Core actual 4 site Site Identifier for the sampling site Ice Core actual 5 sample Sample Sample ID Ice Core actual 6 cycle Cycle Sampling Cycle Ice Core actual 7 date Day Sampling Day Ice Core actual 8 month Month Sampling Month Ice Core actual 9 year Year Sampling Year Ice Core actual 10 chl_mg_m2 Chlorophyll-a per unit area mg m⁻² Integrated chlorophyll‑a concentration per unit area, representing ice‑algal biomass within the ice column. Ice Core actual 11 chl_ug_l Chlorophyll-a per unit volume µg L⁻¹ Chlorophyll‑a concentration in water samples, indicating algal biomass. Ice Core actual 12 nox Nitrite + Nitrate µmol L⁻¹ Combined concentration of nitrate (NO₃⁻) and nitrite (NO₂⁻), representing oxidized inorganic nitrogen. Ice Core actual 13 no3 Nitrate µmol L⁻¹ Concentration of nitrate Ice Core actual 14 no2 Nitrite µmol L⁻¹ Concentration of nitrite Ice Core actual 15 po4 Phosphate µmol L⁻¹ Concentration of dissolved inorganic phosphate Ice Core actual 16 sio4 Silicate µmol L⁻¹ Concentration of dissolved silicate Ice Core actual 17 distance_km Distance km Ice Core actual 18 poc_ugl Particulate Organic Carbon µmol L⁻¹ Concentration of particulate organic carbon Ice Core actual 19 pon_ugl Particulate Organic Nitrogen µmol L⁻¹ Concentration of particulate organic nitrogen. Ice Core actual 20 salinity Salinity No unit Practical salinity of melted sea ice or under‑ice water. Ice Core actual 21 intra_nox Intracellular NOx µmol L⁻¹ Ice Core calculated 22 intra_si Intracellular Silicic Acid µmol L⁻¹ Ice Core calculated 23 intra_po4 Intracellular Phosphate µmol L⁻¹ Ice Core calculated 24 snow_depth_cm Snow Depth cm Depth of snow overlying the sea ice at the sampling site. Ice Core actual 25 ice_thickness_cm Ice Thickness cm Total thickness of the sea‑ice column at the sampling site. Ice Core actual 26 nitrogen_demand Nitrogen Demand mmol m-2 d-1 Estimated nitrogen requirement for ice‑algal production, based on biomass or growth rate calculations. Ice Core calculated 27 bottom_depth Bottom Depth m The depth of the ice-water interface below the snow surface. Ice Core actual