Neven, Ika A; Stefels, Jacqueline; van Heuven, Steven; de Baar, Hein J W; Elzenga, J Theo M (2011): Chemical composition and phytoplankton characteristics of water samples obtained during POLARSTERN cruise ANT-XXIV/3 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.817743, Supplement to: Neven, IA et al. (2011): High plasticity in inorganic carbon uptake by Southern Ocean phytoplankton in response to ambient CO2. Deep Sea Research Part II: Topical Studies in Oceanography, 58(25-26), 2636-2646, https://doi.org/10.1016/j.dsr2.2011.03.006
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Abstract:
The fixation of dissolved inorganic carbon (DIC) by marine phytoplankton provides an important feedback mechanism on concentrations of CO2 in the atmosphere. As a consequence it is important to determine whether oceanic primary productivity is susceptible to changing atmospheric CO2 levels Among numerous other factors, the acquisition of DIC by microalgae particularly in the polar seas is projected to have a significant effect on future phytoplanktonic production and hence atmospheric CO2 concentrations. Using the isotopic disequilibrium technique the contribution of different carbon species (CO2 and bicarbonate) to the overall DIC uptake and the extent to which external Carbonic Anhydrase (eCA) plays a role in facilitating DIC uptake was estimated. Simultaneous uptake of CO2 and HCO3- was observed in all cases, but the proportions in which different DIC species contributed to carbon assimilation varied considerably between stations. Bicarbonate as well as CO2 could be the major DIC source for local phytoplankton assemblages. There was a positive correlation between the contribution of CO2 to total DIC uptake and ambient concentration of CO2 in seawater suggesting that Southern Ocean microalgae could increase the proportion of CO2 uptake under future high atmospheric CO2 levels. Results will be discussed in view of metabolic costs related to DIC acquisition of Southern Ocean phytoplankton.
Project(s):
Coverage:
Median Latitude: -57.095241 * Median Longitude: -14.555679 * South-bound Latitude: -69.400100 * West-bound Longitude: -64.378700 * North-bound Latitude: -47.656200 * East-bound Longitude: 4.270400
Date/Time Start: 2008-02-17T00:00:00 * Date/Time End: 2008-04-11T00:00:00
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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3 datasets
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Datasets listed in this publication series
- Neven, IA; Stefels, J; van Heuven, S et al. (2011): (Table 3) Contribution of different C species and eCA to phytoplanktonic DIC uptake in water samples obtained during POLARSTERN cruise ANT-XXIV/3. https://doi.org/10.1594/PANGAEA.817742
- Neven, IA; Stefels, J; van Heuven, S et al. (2011): (Table 2) Chorophyll a concentration and phytoplankton classes in water samples obtained during POLARSTERN cruise ANT-XXIV/3. https://doi.org/10.1594/PANGAEA.817741
- Neven, IA; Stefels, J; van Heuven, S et al. (2011): (Table 1) Nitrate, phosphate, silicate and CO2 concentrations in water samples obtained during POLARSTERN cruise ANT-XXIV/3. https://doi.org/10.1594/PANGAEA.817740