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Copin-Montégut, Claire; Bégovic, Miléna (2002): Carbonate properties and oxygen concentrations at time series station DYFAMED. PANGAEA, https://doi.org/10.1594/PANGAEA.738581, Supplement to: Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column (0–2000 m) in the central part of the NW Mediterranean Sea (Dyfamed site): influence of winter vertical mixing on air–sea CO2 and O2 exchanges. Deep Sea Research Part II: Topical Studies in Oceanography, 49(11), 2049-2066, https://doi.org/10.1016/S0967-0645(02)00027-9

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Abstract:
Monthly measurements of pH, alkalinity and oxygen over two years (February 1998-February 2000) at the Dyfamed site in the central zone of the Ligurian–Provençal Basin of the Mediterranean made it possible to assess the vertical distributions (5-2000 m) and the seasonal variations of these properties. Alkalinity varies linearly with salinity between surface water and the Levantine Intermediate Water (marked by a maximum of temperature and salinity). In deep water, total alkalinity is also correlated linearly to salinity, but the slope of the regression line is 15% less. In surface water, the pH at 25°C varies between 7.91 and 8.06 on the total proton scale depending upon the season. The lowest values are observed in winter, the highest in spring and in summer. These variations are primarily due to biological production. The pH goes through a minimum around 150-200 m and a small maximum below the intermediate water. The total dissolved inorganic carbon content (deduced from pH and alkalinity) is variable in surface water (2205-2310 ?mol/kg) and has a maximum in intermediate water, which is related to the salinity maximum. Normalized total inorganic carbon at a constant salinity is strongly negatively correlated with pH at 25°C. The fugacity of CO2, (fCO2) varies between 320 and 430 ?atm in surface water, according to the season. Below the seasonal thermocline, the maximum fCO2 (about 410 ?atm) is located around 150-200 m. The presence of a minimum of oxygen in the intermediate water of this area has been observed for several years, but our measurements made it possible to specify the relationship between oxygen and salinity in deep water. Data from the intense vertical mixing during the winters of 1999 and 2000 were used to calculate the oxygen quantity exchanged with the atmosphere during these periods. The estimated quantity of oxygen entering the Mediterranean Sea exceeds that deduced from exchange coefficients calculated with the formula of Wanninkhof and McGillis. During the vertical mixing in the 1999 winter, fCO2 in surface water was on average below equilibrium with atmospheric fCO2, thus implying that CO2 was entering the sea. However, on this time scale, even with high exchange coefficients, the estimated CO2 uptake had no significant influence on the inorganic carbon content in the water column.
Related to:
Bégovic, Miléna; Copin-Montégut, Claire (2002): Processes controlling annual variations in the partial pressure of CO2 in surface waters of the central northwestern Mediterranean Sea (Dyfamed site). Deep Sea Research Part II: Topical Studies in Oceanography, 49(11), 2031-2047, https://doi.org/10.1016/S0967-0645(02)00026-7
Coverage:
Median Latitude: 43.382152 * Median Longitude: 7.513348 * South-bound Latitude: 42.420200 * West-bound Longitude: 7.252200 * North-bound Latitude: 43.448800 * East-bound Longitude: 7.864800
Date/Time Start: 1998-02-06T09:31:00 * Date/Time End: 2000-02-22T12:05:00
Event(s):
DYFAMED_19991003 * Latitude: 43.427700 * Longitude: 7.252200 * Date/Time: 1999-10-03T00:00:00 * Campaign: DYFAMED * Basis: Time-series station * Device: CTD/Rosette (CTD-RO) * Comment: Position of the DYFAMED primary station.
DYFAMED_D000130D * Latitude: 43.416400 * Longitude: 7.853800 * Date/Time: 2000-01-30T13:15:00 * Campaign: DYFAMED * Basis: Time-series station * Device: CTD/Rosette (CTD-RO)
DYFAMED_D000222D * Latitude: 43.413800 * Longitude: 7.850100 * Date/Time: 2000-02-22T12:05:00 * Campaign: DYFAMED * Basis: Time-series station * Device: CTD/Rosette (CTD-RO)
Size:
23 datasets

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Datasets listed in this publication series

  1. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-02-06. https://doi.org/10.1594/PANGAEA.144640
  2. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-03-16. https://doi.org/10.1594/PANGAEA.144641
  3. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-04-25. https://doi.org/10.1594/PANGAEA.144642
  4. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-05-06. https://doi.org/10.1594/PANGAEA.144643
  5. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-06-16. https://doi.org/10.1594/PANGAEA.144644
  6. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-07-22. https://doi.org/10.1594/PANGAEA.144645
  7. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-08-19. https://doi.org/10.1594/PANGAEA.144646
  8. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-09-04. https://doi.org/10.1594/PANGAEA.144647
  9. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-10-10. https://doi.org/10.1594/PANGAEA.144648
  10. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1998-12-09. https://doi.org/10.1594/PANGAEA.144649
  11. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-01-26. https://doi.org/10.1594/PANGAEA.144650
  12. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-02-04. https://doi.org/10.1594/PANGAEA.144651
  13. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-02-21. https://doi.org/10.1594/PANGAEA.144652
  14. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-03-19. https://doi.org/10.1594/PANGAEA.144653
  15. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-04-11. https://doi.org/10.1594/PANGAEA.144654
  16. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-05-15. https://doi.org/10.1594/PANGAEA.144655
  17. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-06-12. https://doi.org/10.1594/PANGAEA.144656
  18. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-07-10. https://doi.org/10.1594/PANGAEA.144657
  19. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-10-03. https://doi.org/10.1594/PANGAEA.144637
  20. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-10-28. https://doi.org/10.1594/PANGAEA.144658
  21. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 1999-12-18. https://doi.org/10.1594/PANGAEA.144659
  22. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 2000-01-30. https://doi.org/10.1594/PANGAEA.144638
  23. Copin-Montégut, C; Bégovic, M (2002): Distributions of carbonate properties and oxygen along the water column at time series station DYFAMED from date 2000-02-22. https://doi.org/10.1594/PANGAEA.144639