  Dynamics of pCO2 and related air-ice CO2 fluxes in the Arctic coastal zone (Amundsen Gulf, Beaufort Sea)Geilfus, Nicolas-Xavier  ; ; et alin Journal of Geophysical Research. Oceans (2012), 117(C00G10), We present an Arctic seasonal survey of carbon dioxide partial pressure (pCO2) dynamics within sea ice brine and related air-ice CO2 fluxes. The survey was carried out from early spring to the beginning ... [more ▼] We present an Arctic seasonal survey of carbon dioxide partial pressure (pCO2) dynamics within sea ice brine and related air-ice CO2 fluxes. The survey was carried out from early spring to the beginning of summer in the Arctic coastal waters of the Amundsen Gulf. High concentrations of pCO2 (up to 1834 matm) were observed in the sea ice in early April as a consequence of concentration of solutes in brines, CaCO3 precipitation and microbial respiration. CaCO3 precipitation was detected through anomalies in total alkalinity (TA) and dissolved inorganic carbon (DIC). This precipitation seems to have occurred in highly saline brine in the upper part of the ice cover and in bulk ice. As summer draws near, the ice temperature increases and brine pCO2 shifts from a large supersaturation (1834 matm) to a marked undersaturation (down to almost 0 matm). This decrease was ascribed to brine dilution by ice meltwater, dissolution of CaCO3 and photosynthesis during the sympagic algal bloom. The magnitude of the CO2 fluxes was controlled by ice temperature (through its control on brine volume and brine channels connectivity) and the concentration gradient between brine and the atmosphere. However, the state of the ice-interface clearly affects air-ice CO2 fluxes. [less ▲] Detailed reference viewed: 14 (0 ULg)Towards a method for high vertical resolution measurements of the partial pressure of CO2 within bulk sea iceGeilfus, Nicolas-Xavier ; Delille, Bruno ; et alin Journal of Glaciology (2012), 58(208), 287-300 Fluxes of atmospheric CO2 have been reported over sea ice during winter and spring. These fluxes are partly driven by the gradient of the CO2 concentration between sea ice and the atmosphere. We present a ... [more ▼] Fluxes of atmospheric CO2 have been reported over sea ice during winter and spring. These fluxes are partly driven by the gradient of the CO2 concentration between sea ice and the atmosphere. We present a new non-destructive method to measure the pCO2 of bulk sea ice at its in situ temperature. This method is based on an equilibration procedure between sea ice and a standard gas of known CO2 concentration. The concentration is measured by gas chromatography with a precision of 5%. Tests were performed on artificial standard sea ice and confirmed the reproducibility of the technique in the range of precision of the gas chromatograph. To test the accuracy of this method, the first profiles of pCO2 measured in bulk sea ice are reported and compared with direct in situ measurements of brine pCO2 over depth-integrated intervals. [less ▲] Detailed reference viewed: 11 (0 ULg) O2/Ar and CH4 measurements in sea ice : clues for the key status of sea ice in the climate system; ; et al in Geophysical Research Abstracts (2011, April 08), 13 Detailed reference viewed: 21 (7 ULg)Temporal evolution of biogeochemical properties of landfast sea ice at Barrow (Alaska)Zhou, Jiayun ; ; et alPoster (2011, March) Detailed reference viewed: 12 (2 ULg)A multidisciplinary approach to understanding the sea ice system: implications on gas. Gordon Research SeminarsZhou, Jiayun ; ; et alConference (2011, March) Detailed reference viewed: 6 (1 ULg)Dynamic processes in sea ice captured by the temporal evolution of its biogeochemical; ; et al in VLIZ Special Publication (2011), 48 Detailed reference viewed: 10 (3 ULg)Air-ice CO2 fluxes and pCO2 dynamics in sea ice in the Arctic coastal area (Amundsen Gulf, Canada)Geilfus, Nicolas-Xavier ; ; et alConference (2010, May) Detailed reference viewed: 20 (5 ULg)Micrometeorological survey of air-sea ice CO2 fluxes in arctic coastal watersHeinesch, Bernard ; ; et alin Geophysical Research Abstracts (2010), 12(EGU2010-10570), Detailed reference viewed: 23 (9 ULg)Air-sea ice CO2 fluxes measurement with eddy-covariance micrometeorological techniqueHeinesch, Bernard ; Aubinet, Marc ; et alConference (2010) Detailed reference viewed: 28 (6 ULg)Spatiotemporal variations of DMSO in arctic sea ice: new insights using dmso reductase enzyme; ; et al Poster (2009, November) Detailed reference viewed: 11 (4 ULg)Air-ice CO2 fluxes and pCO2 dynamics in sea ice in the Arctic (Amundsen Gulf)Geilfus, Nicolas-Xavier ; ; et alConference (2009, November) Detailed reference viewed: 7 (3 ULg)Measuring air-ice CO2 fluxes in the ArcticHeinesch, Bernard ; ; Aubinet, Marc et alin FluxLetter: the Newsletter of FLUXNET (2009), 2(2), 9-10 Detailed reference viewed: 30 (16 ULg)Air-ice CO2 fluxes in the Arctic coastal areaGeilfus, Nicolas-Xavier ; ; et alPoster (2009, May) Detailed reference viewed: 35 (3 ULg)Air-ice CO2 fluxes in the Arctic coastal area (Amundsen Gulf)Geilfus, Nicolas-Xavier ; ; et alPoster (2009, March) Detailed reference viewed: 10 (0 ULg)Dynamics of flood-freeze cycles during the SIMBA experiment (Brussels and Liège Stations - Bellingshaussen Sea, Antarctica); ; Geilfus, Nicolas-Xavier et alPoster (2009, March) Detailed reference viewed: 12 (0 ULg)Physico-chemical properties and CO2 fluxes at a frost flowers station (SIMBA Experiment - Bellingshaussen Sea, Antarctica); ; Geilfus, Nicolas-Xavier et alPoster (2009, March) Detailed reference viewed: 8 (0 ULg)Survey of air-ice ocean carbon dioxyde exchange over arctic sea-iceHeinesch, Bernard ; Aubinet, Marc ; et alConference (2009) Detailed reference viewed: 20 (5 ULg)Measuring CO2 in sea ice: caveats and improvementsGeilfus, Nicolas-Xavier ; Delille, Bruno ; et alPoster (2008, April) Detailed reference viewed: 4 (0 ULg)Sea ice pCO2 dynamics and related air-ice CO2 fluxes during a flood-freeze cycle (Bellingshausen Sea, Antarctica)Geilfus, Nicolas-Xavier ; ; et alPoster (2008, April) Detailed reference viewed: 17 (1 ULg)Measurement of the partial pressure of CO2 in bulk sea iceGeilfus, Nicolas-Xavier ; ; Poster (2007, July) Detailed reference viewed: 4 (0 ULg) |
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