CO2-system development in young sea ice and CO2 gas exchange at the ice/air interface mediated by brine and frost flowers in Kongsfjorden, Spitsbergen
Artikel i vetenskaplig tidskrift, 2015

In March and April 2010, we investigated the development of young landfast sea ice in Kongsfjorden, Spitsbergen, Svalbard. We sampled the vertical column, including sea ice, brine, frost flowers and sea water, to determine the CO2 system, nutrients, salinity and bacterial and ice algae production during a 13 day interval of ice growth. Apart from the changes due to salinity and brine rejection, the sea-ice concentrations of total inorganic carbon (C T), total alkalinity (A T), CO2 and carbonate ions (CO3 2–) in melted ice were influenced by dissolution of calcium carbonate (CaCO3) precipitates (25–55 μmol kg–1) and played the largest role in the changes to the CO2 system. The C T values were also influenced by CO2 gas flux, bacterial carbon production and primary production, which had a small impact on the C T. The only exception was the uppermost ice layer. In the top 0.05 m of the ice, there was a CO2 loss of ∼20 μmol kg–1 melted ice (1 mmol m–2) from the ice to the atmosphere. Frost flowers on newly formed sea ice were important in promoting ice–air CO2 gas flux, causing a CO2 loss to the atmosphere of 140–800 μmol kg–1 d–1 melted frost flowers (7–40 mmol m–2 d–1).

Atmosphere/ice/ocean interactions

Polar and subpolar oceans

Sea-ice dynamics

Ice chemistry

Författare

Agneta Fransson

Göteborgs universitet

Melissa Chierici

Göteborgs universitet

Katarina Abrahamsson

Göteborgs universitet

Maria Andersson

Göteborgs universitet

Anna Granfors

Göteborgs universitet

Katarina Gårdfeldt

Chalmers, Kemi och kemiteknik, Energi och material, Oorganisk miljökemi

Göteborgs universitet

Anders Torstensson

Göteborgs universitet

Angela Wulff

Göteborgs universitet

Annals of Glaciology

0260-3055 (ISSN)

Vol. 56 245-257

Ämneskategorier

Oceanografi, hydrologi, vattenresurser

Miljövetenskap

DOI

10.3189/2015AoG69A563