Arctic and Antarctic sea ice acts as a sink for atmospheric CO2 during periods of snowmelt and surface flooding

In this study, we present evidence that Antarctic and Arctic sea ice act as sink for atmospheric CO2 during periods of snowmelt and surface flooding. The CO2 flux measured directly at the flooded sea ice surface (Fflood) constituted a net CO2 sink of −1.1 ± 0.9 mmol C m−2 d−1 (mean ± 1 SD), which wa...

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Bibliographic Details
Published in:Journal of Geophysical Research: Oceans
Main Authors: Nomura, Daiki, Granskog, Mats A., Assmy, Philipp, Simizu, Daisuke, Hashida, Gen
Format: Article in Journal/Newspaper
Language:English
Published: Wiley
Subjects:
sea ice
snow
CO2
gas exchange
Arctic
Antarctic
660
Antarc*
Sea ice
Online Access:http://hdl.handle.net/2115/70585
https://doi.org/10.1002/2013JC009048
Description
Summary:In this study, we present evidence that Antarctic and Arctic sea ice act as sink for atmospheric CO2 during periods of snowmelt and surface flooding. The CO2 flux measured directly at the flooded sea ice surface (Fflood) constituted a net CO2 sink of −1.1 ± 0.9 mmol C m−2 d−1 (mean ± 1 SD), which was an order of magnitude higher than the flux measured at the snow‐air surface (Fsnow) and bare ice surface (Fice). The Fsnow/Fflood ratio decreased with increasing water equivalent of snow and superimposed‐ice, suggesting that the properties of snow and superimposed‐ice formation affect the magnitude of the CO2 flux. The Fsnow/Fflood ratio ranged from 0.1 to 0.5, illustrating that 50–90% of the potential flux at the flooded surface was reduced due to the presence of snow/superimposed‐ice. Hence, snow cover properties and superimposed‐ice play an important role in the CO2 fluxes across the sea ice‐snow‐atmosphere interface.

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