13 Oct 2022
13 Oct 2022
Status: this preprint is currently under review for the journal BG.

Carbon monoxide (CO) cycling in the Fram Strait, Arctic Ocean

Hanna I. Campen1, Damian L. Arévalo-Martínez1,2,a, and Hermann W. Bange1 Hanna I. Campen et al.
  • 1Marine Biogeochemistry, GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany
  • 2Institute of Geosciences, Kiel University, Kiel, Germany
  • anow at: Radboud University, Nijmegen, The Netherlands

Abstract. Carbon monoxide (CO) influences the radiative budget and oxidative capacity of the atmosphere over the Arctic Ocean, which is a source of atmospheric CO. Yet, oceanic CO cycling is understudied in this area, particularly in view of the ongoing rapid environmental changes. We present results from incubation experiments conducted in the Fram Strait in August/September 2019 under different environmental conditions: While lower pH did not affect CO production (GPCO) or consumption (kCO) rates, enhanced GPCO and kCO were positively correlated with coloured dissolved organic matter (CDOM) and dissolved nitrate concentrations, respectively, suggesting microbial CO uptake under oligotrophic conditions to be a driving factor for variability in CO surface concentrations. Both production and consumption of CO will likely increase in the future, but it is unknown which process will dominate. Our results will help to improve models predicting future CO concentrations and emissions and their effects on the radiative budget and the oxidative capacity of the Arctic atmosphere.

Hanna I. Campen et al.

Status: open (until 17 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2022-201', Anonymous Referee #1, 07 Nov 2022 reply
  • RC2: 'Comment on bg-2022-201', Anonymous Referee #2, 29 Nov 2022 reply
  • RC3: 'Comment on bg-2022-201', Anonymous Referee #2, 29 Nov 2022 reply
  • RC4: 'Comment on bg-2022-201', Anonymous Referee #3, 06 Dec 2022 reply

Hanna I. Campen et al.

Hanna I. Campen et al.


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Short summary
Carbon monoxide (CO) is a climate-relevant trace gas emitted from the ocean. However, oceanic CO cycling is understudied. Results from incubation experiments conducted in the Fram Strait (Arctic Ocean) indicated that (i) pH did not affect CO cycling, (ii) enhanced CO production and consumption were positively correlated with colored dissolved organic matter and nitrate concentrations, respectively. This suggests microbial CO uptake to be the driving factor for CO cycling in the Arctic Ocean.