Effects of increase glacier discharge on phytoplankton bloom dynamics and pelagic geochemistry in a high Arctic fjord

Handle URI:
http://hdl.handle.net/10754/625271
Title:
Effects of increase glacier discharge on phytoplankton bloom dynamics and pelagic geochemistry in a high Arctic fjord
Authors:
Calleja, Maria Ll.; Kerhervé, P.; Bourgeois, S.; Kędra, M.; Leynaert, A.; Devred, E.; Babin, M.; Morata, N.
Abstract:
Arctic fjords experience extremely pronounced seasonal variability and spatial heterogeneity associated with changes in ice cover, glacial retreat and the intrusion of continental shelf’s adjacent water masses. Global warming intensifies natural environmental variability on these important systems, yet the regional and global effects of these processes are still poorly understood. In the present study, we examine seasonal and spatial variability in Kongsfjorden, on the western coast of Spitsbergen, Svalbard. We report hydrological, biological, and biogeochemical data collected during spring, summer, and fall 2012. Our results show a strong phytoplankton bloom with the highest chlorophyll a (Chla) levels ever reported in this area, peaking 15.5 µg/L during late May and completely dominated by large diatoms at the inner fjord, that may sustain both pelagic and benthic production under weakly stratified conditions at the glacier front. A progressively stronger stratification of the water column during summer and fall was shaped by the intrusion of warm Atlantic water (T > 3°C and Sal > 34.65) into the fjord at around 100 m depth, and by turbid freshwater plumes (T < 1°C and Sal < 34.65) at the surface due to glacier meltwater input. Biopolymeric carbon fractions and isotopic signatures of the particulate organic material (POM) revealed very fresh and labile material produced during the spring bloom (13C enriched, with values up to -22.7‰ at the highest Chl a peak, and high in carbohydrates and proteins content -up to 167 and 148 µg/L, respectively-), and a clear and strong continental signature of the POM present during late summer and fall (13C depleted, with values averaging -26.5 ‰, and high in lipid content –up to 92 µg/L-) when freshwater melting is accentuated. Our data evidence the importance of combining both physical (i.e. water mass dominance) and geochemical (i.e. characteristics of material released by glacier runoff) data in order to understand the timing, intensity and characteristics of the phytoplankton bloom in Kongsfjorden, a continuously changing system due to sustained warming. In a scenario where glacial retreat is predicted to increase the impacts of meltwater discharge and associated delivery of organic and inorganic material to the surrounding waters, special attention is required in order to predict the consequences for Arctic fjords and adjacent shelf ecosystems.
KAUST Department:
King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
Citation:
Calleja ML, Kerhervé P, Bourgeois S, Kędra M, Leynaert A, et al. (2017) Effects of increase glacier discharge on phytoplankton bloom dynamics and pelagic geochemistry in a high Arctic fjord. Progress in Oceanography. Available: http://dx.doi.org/10.1016/j.pocean.2017.07.005.
Publisher:
Elsevier BV
Journal:
Progress in Oceanography
Issue Date:
26-Jul-2017
DOI:
10.1016/j.pocean.2017.07.005
Type:
Article
ISSN:
0079-6611
Sponsors:
This research was part of the ECOTAB project funded by The French “Agence Nationale de la Recherche” (Ref: ANR-11-PDOC-0018) and the French Polar Institut Paul Emile Victor (IPEV). We thank the crew of the workboat MS Teistein and the Kings Bay personnel. We also thank Marion Maturilli and all AWIPEV personnel at Ny-Ålesund for dedicated, professional assistance and for providing meteorological data. We thank F. Narcy, J. Richard, E. Amice, A. Aubert, and G. Duong for their help on the field for samples collection and M. LeGoff, R. Corvaisier and B. Beker for nutrient and phytoplankton analyses. We also want to thank the anonymous reviewers who contributed a significant amount of effort to improving the manuscript. M. Ll. C. was funded by the Spanish Research Council, Consejo Superior de Investigaciones Cientificas (CSIC, grant JAEDOC030-2010) and co-funded by the Fondo Social Europeo (FSO). S.B was funded by the Conseil Général du Finistère (CG29). M. K. was further financed by Polish Ministry of Science and Higher Education grant number W70/ECOTAB/2014. We thank J. A. Hale for English corrections and constructive comments.
Additional Links:
http://www.sciencedirect.com/science/article/pii/S007966111630180X
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorCalleja, Maria Ll.en
dc.contributor.authorKerhervé, P.en
dc.contributor.authorBourgeois, S.en
dc.contributor.authorKędra, M.en
dc.contributor.authorLeynaert, A.en
dc.contributor.authorDevred, E.en
dc.contributor.authorBabin, M.en
dc.contributor.authorMorata, N.en
dc.date.accessioned2017-07-27T11:21:47Z-
dc.date.available2017-07-27T11:21:47Z-
dc.date.issued2017-07-26en
dc.identifier.citationCalleja ML, Kerhervé P, Bourgeois S, Kędra M, Leynaert A, et al. (2017) Effects of increase glacier discharge on phytoplankton bloom dynamics and pelagic geochemistry in a high Arctic fjord. Progress in Oceanography. Available: http://dx.doi.org/10.1016/j.pocean.2017.07.005.en
dc.identifier.issn0079-6611en
dc.identifier.doi10.1016/j.pocean.2017.07.005en
dc.identifier.urihttp://hdl.handle.net/10754/625271-
dc.description.abstractArctic fjords experience extremely pronounced seasonal variability and spatial heterogeneity associated with changes in ice cover, glacial retreat and the intrusion of continental shelf’s adjacent water masses. Global warming intensifies natural environmental variability on these important systems, yet the regional and global effects of these processes are still poorly understood. In the present study, we examine seasonal and spatial variability in Kongsfjorden, on the western coast of Spitsbergen, Svalbard. We report hydrological, biological, and biogeochemical data collected during spring, summer, and fall 2012. Our results show a strong phytoplankton bloom with the highest chlorophyll a (Chla) levels ever reported in this area, peaking 15.5 µg/L during late May and completely dominated by large diatoms at the inner fjord, that may sustain both pelagic and benthic production under weakly stratified conditions at the glacier front. A progressively stronger stratification of the water column during summer and fall was shaped by the intrusion of warm Atlantic water (T > 3°C and Sal > 34.65) into the fjord at around 100 m depth, and by turbid freshwater plumes (T < 1°C and Sal < 34.65) at the surface due to glacier meltwater input. Biopolymeric carbon fractions and isotopic signatures of the particulate organic material (POM) revealed very fresh and labile material produced during the spring bloom (13C enriched, with values up to -22.7‰ at the highest Chl a peak, and high in carbohydrates and proteins content -up to 167 and 148 µg/L, respectively-), and a clear and strong continental signature of the POM present during late summer and fall (13C depleted, with values averaging -26.5 ‰, and high in lipid content –up to 92 µg/L-) when freshwater melting is accentuated. Our data evidence the importance of combining both physical (i.e. water mass dominance) and geochemical (i.e. characteristics of material released by glacier runoff) data in order to understand the timing, intensity and characteristics of the phytoplankton bloom in Kongsfjorden, a continuously changing system due to sustained warming. In a scenario where glacial retreat is predicted to increase the impacts of meltwater discharge and associated delivery of organic and inorganic material to the surrounding waters, special attention is required in order to predict the consequences for Arctic fjords and adjacent shelf ecosystems.en
dc.description.sponsorshipThis research was part of the ECOTAB project funded by The French “Agence Nationale de la Recherche” (Ref: ANR-11-PDOC-0018) and the French Polar Institut Paul Emile Victor (IPEV). We thank the crew of the workboat MS Teistein and the Kings Bay personnel. We also thank Marion Maturilli and all AWIPEV personnel at Ny-Ålesund for dedicated, professional assistance and for providing meteorological data. We thank F. Narcy, J. Richard, E. Amice, A. Aubert, and G. Duong for their help on the field for samples collection and M. LeGoff, R. Corvaisier and B. Beker for nutrient and phytoplankton analyses. We also want to thank the anonymous reviewers who contributed a significant amount of effort to improving the manuscript. M. Ll. C. was funded by the Spanish Research Council, Consejo Superior de Investigaciones Cientificas (CSIC, grant JAEDOC030-2010) and co-funded by the Fondo Social Europeo (FSO). S.B was funded by the Conseil Général du Finistère (CG29). M. K. was further financed by Polish Ministry of Science and Higher Education grant number W70/ECOTAB/2014. We thank J. A. Hale for English corrections and constructive comments.en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S007966111630180Xen
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Progress in Oceanography. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Progress in Oceanography, [, , (2017-07-26)] DOI: 10.1016/j.pocean.2017.07.005 . © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectArcticen
dc.subjectfjordsen
dc.subjectglaciersen
dc.subjectorganic matteren
dc.subjectdiatom bloomen
dc.subjectcarbon and nitrogen stable isotopesen
dc.titleEffects of increase glacier discharge on phytoplankton bloom dynamics and pelagic geochemistry in a high Arctic fjorden
dc.typeArticleen
dc.contributor.departmentKing Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabiaen
dc.identifier.journalProgress in Oceanographyen
dc.eprint.versionPost-printen
dc.contributor.institutionInstituto Andaluz de Ciencias de la Tierra. IACT (CSIC–UGR), Avenida de Las Palmeras 4, 18100 Armilla, Granada, Spainen
dc.contributor.institutionCentre de Formation et de Recherche sur les Environnements Méditerranéens (CEFREM), UMR5110, Université de Perpignan Via Domitia, 66860, Perpignan, Franceen
dc.contributor.institutionSchool of Biological Sciences, Oceanlab, University of Aberdeen, Aberdeen, Scotland AB41 6AA, UKen
dc.contributor.institutionLaboratoire des sciences de l’Environnement MARin (LEMAR), UMR 6539, Université de Bretagne Occidentale, Rue Dumont D’Urville, 29280 Plouzané, Franceen
dc.contributor.institutionInstitute of Oceanology, Polish Academy of Sciences, Powstańców Warszawy 55, Sopot 81-712, Polanden
dc.contributor.institutionTakuvik, UMI 3316, Université Laval, Département de Biologie, Pavillon Alexandre-Vachon 1045, avenue de la Médecine, Québec City, QC G1V 0A6, Canadaen
kaust.authorCalleja, Maria Ll.en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.