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

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 light of the ongoing rapid environmental changes. We present results from in...

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Bibliographic Details
Published in:Biogeosciences 2023-04, Vol.20 (7), p.1371-1379
Main Authors: Campen, Hanna I, Arévalo-Martínez, Damian L, Bange, Hermann W
Format: Article
Language:English
Subjects:
Acidification
Atmosphere
Atmospheric boundary layer
Atmospheric models
Budgets
Carbon cycle
Carbon dioxide
Carbon monoxide
Colour
Consumption
Cycles
Dissolved organic matter
Emissions
Environmental changes
Environmental conditions
Light
Microorganisms
Ocean
Oceans
Seawater
Temperature
Uptake
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Summary: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 light 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.
ISSN:1726-4189
1726-4170
1726-4189
DOI:10.5194/bg-20-1371-2023