Underway measurements of dissolved gases along POLARSTERN cruise track ANT-XXVII/2 ...

• Main Authors: Bittig, Henry, Körtzinger, Arne
• Format: Dataset
• Language: English
• Published: PANGAEA 2015
• Subjects: DATE/TIME; LATITUDE; LONGITUDE; DEPTH, water; Temperature, water; Salinity; Pressure, atmospheric; Oxygen; Oxygen, partial pressure; Oxygen saturation; Pressure, total, dissolved gases; Nitrogen, total dissolved; Nitrogen, partial pressure; Nitrogen saturation; Underway cruise track measurements; Thermosalinograph; Ships weather station; Oxygen optode, Aanderaa, type 3830; derived; Gas Tension Device; ANT-XXVII/2; Polarstern; OCEANET OCEANET; Sea ice; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.848615; https://doi.pangaea.de/10.1594/PANGAEA.848615

We present measurements of pCO2, O2 concentration, biological oxygen saturation (Delta O2/Ar) and N2 saturation (Delta N2) in Southern Ocean surface waters during austral summer, 2010-2011. Phytoplankton biomass varied strongly across distinct hydrographic zones, with high chlorophyll a (Chla) concentrations in regions of frontal mixing and sea-ice melt. pCO2 and Delta O2 /Ar exhibited large spatial gradients (range 90 to 450 µatm and -10 to 60%, respectively) and co-varied strongly with Chla. However, the ratio of biological O2 accumulation to dissolved inorganic carbon (DIC) drawdown was significantly lower than expected from photosynthetic stoichiometry, reflecting the differential time-scales of O2 and CO2 air-sea equilibration. We measured significant oceanic CO2 uptake, with a mean air-sea flux (~ -20 mmol m-2 d-1) that significantly exceeded regional climatological values. N2 was mostly supersaturated in surface waters (mean Delta N2 of +2.5 %), while physical processes resulted in both ... : Supplement to: Tortell, Philippe Daniel; Bittig, Henry; Körtzinger, Arne; Jones, Elizabeth M; Hoppema, Mario (2015): Biological and physical controls on N2, O2, and CO2 distributions in contrasting Southern Ocean surface waters. Global Biogeochemical Cycles, 29(7), 994-1013 ...