scholarly journals Impact of dissolved inorganic carbon concentrations and pH on growth of the chemolithoautotrophic epsilonproteobacterium S ulfurimonas gotlandica GD1 T

2013 ◽  
Vol 3 (1) ◽  
pp. 80-88 ◽  
Author(s):  
Kerstin Mammitzsch ◽  
Günter Jost ◽  
Klaus Jürgens
Keyword(s):  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Carbon Concentrations

Growth, photosynthesis, and extracellular organic release in colonized and axenic Myriophyllum spicatum

1989 ◽  
Vol 67 (12) ◽  
pp. 3429-3438 ◽  
Author(s):  
H. Godmaire ◽  
C. Nalewajko
Keyword(s):  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Myriophyllum Spicatum ◽  
Distribution Patterns ◽  
Release Rates ◽  
Lower Growth ◽  
Bicarbonate Uptake ◽  
Algal Photosynthesis ◽  
Major Nutrients ◽  
Carbon Concentrations

Growth and photosynthesis of axenic and colonized Myriophyllum were compared to test the validity of using axenic plants as controls in the quantification of extracellular organic carbon (EOC) release. Axenic plants were characterized by lower growth rates that could be attributed to the unavailability of some major nutrients other than N, P, or C and (or) micronutrients in the culture medium. Vmax, the maximum rate of bicarbonate uptake, and Pmax, the maximum light-saturated rate of photosynthesis, of nonaxenic Myriophyllum were significantly higher than those of axenic plants. These differences could be attributed to epiphytic algal photosynthesis. At subsaturating dissolved inorganic carbon concentrations (below 15 mg C ∙ L−1), both plants achieved similar rates of photosynthesis but differed in the kinetics of EOC release. In short-term incubation (2–6 h), 14C-EOC accounted for 0.2–0.4% of photosynthesis, and total EOC amounted to 1.3–3.8%. 14C-EOC consisted primarily (≥ 60%) of low molecular weight products (≤ 1500). No differences were apparent in size distribution patterns of 14C-EOC from axenic and nonaxenic Myriophyllum and at different dissolved inorganic carbon concentrations. Axenic plants generally showed lower rates of EOC release (in absolute values). On colonized Myriophyllum, the contribution of the epiphytes to the EOC release pool was found to be low (≤ 20% of 14C-EOC) and could partly explain the greater EOC release rates of nonaxenic plants. However, our results are not totally conclusive because the lower growth rate of axenic plants could also be responsible for the lower photosynthetic and EOC release rates of these plants.

scholarly journals Transient tracer distributions in the Fram Strait in 2012 and inferred anthropogenic carbon content and transport

Ocean Science ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 319-333 ◽  
Author(s):  
Tim Stöven ◽  
Toste Tanhua ◽  
Mario Hoppema ◽  
Wilken-Jon von Appen
Keyword(s):  
Surface Water ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Atlantic Water ◽  
Fram Strait ◽  
Polar Surface ◽  
Anthropogenic Carbon ◽  
Tracer Age ◽  
Transient Tracer ◽  
Carbon Concentrations

Abstract. The storage of anthropogenic carbon in the ocean's interior is an important process which modulates the increasing carbon dioxide concentrations in the atmosphere. The polar regions are expected to be net sinks for anthropogenic carbon. Transport estimates of dissolved inorganic carbon and the anthropogenic offset can thus provide information about the magnitude of the corresponding storage processes. Here we present a transient tracer, dissolved inorganic carbon (DIC) and total alkalinity (TA) data set along 78°50′ N sampled in the Fram Strait in 2012. A theory on tracer relationships is introduced, which allows for an application of the inverse-Gaussian–transit-time distribution (IG-TTD) at high latitudes and the estimation of anthropogenic carbon concentrations. Mean current velocity measurements along the same section from 2002–2010 were used to estimate the net flux of DIC and anthropogenic carbon by the boundary currents above 840 m through the Fram Strait. The new theory explains the differences between the theoretical (IG-TTD-based) tracer age relationship and the specific tracer age relationship of the field data, by saturation effects during water mass formation and/or the deliberate release experiment of SF6 in the Greenland Sea in 1996, rather than by different mixing or ventilation processes. Based on this assumption, a maximum SF6 excess of 0.5–0.8 fmol kg−1 was determined in the Fram Strait at intermediate depths (500–1600 m). The anthropogenic carbon concentrations are 50–55 µmol kg−1 in the Atlantic Water/Recirculating Atlantic Water, 40–45 µmol kg−1 in the Polar Surface Water/warm Polar Surface Water and between 10 and 35 µmol kg−1 in the deeper water layers, with lowest concentrations in the bottom layer. The net fluxes through the Fram Strait indicate a net outflow of  ∼  0.4 DIC and  ∼  0.01 PgC yr−1 anthropogenic carbon from the Arctic Ocean into the North Atlantic, albeit with high uncertainties.

scholarly journals B/Ca in coccoliths and relationship to calcification vesicle pH and dissolved inorganic carbon concentrations

2012 ◽  
Vol 80 ◽  
pp. 143-157 ◽  
Author(s):  
Heather Stoll ◽  
Gerald Langer ◽  
Nobumichi Shimizu ◽  
Kinuyo Kanamaru
Keyword(s):  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Carbon Concentrations

Isotopic Composition of Dissolved Inorganic Carbon in the Great Lakes

1978 ◽  
Vol 35 (4) ◽  
pp. 422-430 ◽  
Author(s):  
R. R. Weiler ◽  
J. O. Nriagu
Keyword(s):  
Organic Matter ◽  
Great Lakes ◽  
Lake Erie ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Total Inorganic Carbon ◽  
Upper Great Lakes ◽  
Industrial Sewage ◽  
Carbon Concentrations ◽  
Isotopic Effects

Values for the δ13C of the dissolved total inorganic carbon in the Great Lakes are presented. The surface values are about two parts per thousand more negative than the values to be expected assuming equilibrium with the atmospheric CO2 reservoir. In the hypolimnion of Lake Erie, the values become more negative as the summer progresses due to the increasing amounts of CO2 from decaying organic matter. Although Lakes Erie and Ontario receive considerably larger amounts of organic carbon as domestic and industrial sewage effluents than the upper Great Lakes, their higher inorganic carbon concentrations evidently mask any isotopic effects from the decay of the organic pollutants. Models to explain the variation in the δ13C in the hypolimnion and epilimnion of a lake are presented. The agreement between predicted and observed δ13C trends for the hypolimnion model is reasonable, suggesting that the flux rates assumed in the model are reasonable for the processes occurring in the lakes. Key words: carbon isotopes, Great Lakes, inorganic carbon, models

scholarly journals Helium, inorganic and organic carbon isotopes of fluids and gases across the Costa Rica convergent margin

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Peter H. Barry ◽  
Mayuko Nakagawa ◽  
Donato Giovannelli ◽  
J. Maarten de Moor ◽  
Matthew Schrenk ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Gas Phase ◽  
Inorganic Carbon ◽  
Dissolved Inorganic Carbon ◽  
Costa Rican ◽  
C Isotopes ◽  
He Isotopes ◽  
Autotrophic Biomass ◽  
Calcite Deposition ◽  
Carbon Concentrations

AbstractIn 2017, fluid and gas samples were collected across the Costa Rican Arc. He and Ne isotopes, C isotopes as well as total organic and inorganic carbon concentrations were measured. The samples (n = 24) from 2017 are accompanied by (n = 17) samples collected in 2008, 2010 and 2012. He-isotopes ranged from arc-like (6.8 RA) to crustal (0.5 RA). Measured dissolved inorganic carbon (DIC) δ13CVPDB values varied from 3.55 to −21.57‰, with dissolved organic carbon (DOC) following the trends of DIC. Gas phase CO2 only occurs within ~20 km of the arc; δ13CVPDB values varied from −0.84 to −5.23‰. Onsite, pH, conductivity, temperature and dissolved oxygen (DO) were measured; pH ranged from 0.9–10.0, conductivity from 200–91,900 μS/cm, temperatures from 23–89 °C and DO from 2–84%. Data were used to develop a model which suggests that ~91 ± 4.0% of carbon released from the slab/mantle beneath the Costa Rican forearc is sequestered within the crust by calcite deposition with an additional 3.3 ± 1.3% incorporated into autotrophic biomass.

Sign in / Sign up

Export Citation Format

Share Document