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dc.contributor.authorEricson, Ylva
dc.contributor.authorFalck, Eva
dc.contributor.authorChierici, Melissa
dc.contributor.authorFransson, Agneta Ingrid
dc.contributor.authorKristiansen, Svein
dc.date.accessioned2020-03-24T09:58:03Z
dc.date.available2020-03-24T09:58:03Z
dc.date.issued2019-05-04
dc.description.abstractThe marine CO<sub>2</sub> system in Tempelfjorden (Svalbard) was investigated between August 2015 and December 2017 using total alkalinity, pH, temperature, salinity, oxygen isotopic ratio, and nutrient data. Primary production resulted in the largest changes that were observed in the partial pressure of CO<sub>2</sub> (<i>p</i>CO<sub>2</sub>, 140 μatm) and the saturation state of aragonite (Ω<sub>Ar</sub>, 0.9). Over the period of peak freshwater discharge (June to August), the freshwater addition and air-sea CO<sub>2</sub> uptake (on average 15.5 mmol m<sup>−2</sup> day<sup>−1</sup> in 2017) governed the surface <i>p</i>CO<sub>2</sub>. About one fourth of the uptake was driven by the freshening. The sensitivity of Ω<sub>Ar</sub> to the freshwater addition was investigated using robust regressions. If the effect of air-sea CO<sub>2</sub> exchange was removed from Ω<sub>Ar</sub>, a freshwater fraction larger than 50% (lower range of uncertainty) was needed to provide aragonite undersaturated waters. This study shows that Ω<sub>Ar</sub> and freshwater fraction relationships that are derived from regression techniques and the interpretation thereof are sensitive to the effect of air-sea CO<sub>2</sub> exchange. Since the freshening in itself only drives a fraction of the air-sea CO<sub>2</sub> uptake, studies that do not account for this exchange will overestimate the impact of freshwater on ΩAr. Finally, in the summer an excess in the salinity normalized dissolved inorganic carbon, corrected for aerobic primary production/respiration, of on average 86 μmol kg<sup>−1</sup> was found in the deepest water of the fjord. This excess is suggested to be a result of enhanced CO<sub>2</sub> uptake and brine release during the period of sea ice growth.en_US
dc.descriptionAccepted manuscript version, licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0. </a>en_US
dc.identifier.citationEricson Y, Falck E, Chierici M, Fransson AI, Kristiansen S. Marine CO2 system variability in a high arctic tidewater-glacier fjord system, Tempelfjorden, Svalbard. Continental Shelf Research. 2019;181:1-13en_US
dc.identifier.cristinIDFRIDAID 1706544
dc.identifier.doi10.1016/j.csr.2019.04.013
dc.identifier.issn0278-4343
dc.identifier.issn1873-6955
dc.identifier.urihttps://hdl.handle.net/10037/17832
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalContinental Shelf Research
dc.relation.projectIDNorges forskningsråd: 10662en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SSF/269998/Norway/Seasonal variability in glacial meltwater and sea-air CO2 fluxes in Tempelfjorden, Svalbard (RiS ID 10662)//en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holder© 2019 Elsevier Ltd. All rights reserved.en_US
dc.subjectVDP::Mathematics and natural science: 400en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400en_US
dc.titleMarine CO2 system variability in a high arctic tidewater-glacier fjord system, Tempelfjorden, Svalbarden_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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