Dataset Persistent ID
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doi:10.25850/nioz/7b.b.u |
Publication Date
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2020-05-01 |
Title
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Fe-binding ligands in Fram Strait and over the Northeast Greenland shelf - cruise PS100
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Other ID
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DAS:e4a22996-327a-4c00-a1a3-cdc135d88ce9
DOI:10.25850/nioz/7b.b.u
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Author
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Gerringa, Loes (Royal Netherlands Institute for Sea Research) - ORCID: 0000-0002-3139-8352
Middag, Rob (NIOZ) - ORCID: 0000-0002-3326-530X
Gledhill, Martha (GEOMAR) - ORCID: 0000-0003-3859-2112
Reichart, Gert-Jan (NIOZ) - ORCID: 0000-0002-7256-2243
Lodeiro, Pablo (GEOMAR) - ORCID: 0000-0002-2557-5391
Achterberg, Eric (GEOMAR) - ORCID: 0000-0002-3061-2767
Ardiningsih, Indah (NIOZ) - ORCID: 0000-0002-3537-6927
Krisch, Stephan (GEOMAR) - ORCID: 0000-0002-7842-0676
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Contact
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Use email button above to contact.
Gerringa, Loes (NIOZ Royal Netherlands Institute for Sea Research)
Research Data Management (NIOZ Royal Netherlands Institute for Sea Research)
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Description
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There is a paucity of data on Fe-binding ligands in the Arctic Ocean. Here we investigate the distribution and chemical properties of natural Fe-binding ligands in Fram Strait and over the northeast Greenland shelf, shedding light on their potential sources and transport. Our results indicate that the main sources of organic ligands to surface waters of Fram Strait included primary productivity and supply from the Arctic Ocean. We calculated the mean total Fe-binding ligand concentration, [Lt], in Polar Surface Water from the western Fram Strait to be 1.65 ? 0.4 nM eq. Fe. This value is in between reported values for the Arctic and North Atlantic Oceans, confirming reports of north to south decreases in [Lt] from the Arctic Ocean. The differences between ligand sources in different biogeochemical provinces, resulted in distinctive ligand properties and distributions that are reflected in [Lt], binding strength (log K?) and competing strength (log ?) of ligands. Higher [Lt] was present near the Nioghalvfjerdsfjorden (79 N) Glacier terminus and in the Westwind Trough (median of [Lt] = 2.17 nM eq. Fe; log K? = 12.3; log ? = 3.4) than in the Norske Trough (median of [Lt] = 1.89 nM eq. Fe; log K?= 12.8; log ? = 3.8) and in Fram Strait (median of [Lt] = 1.38 nM eq. Fe; log K? = 13; log ? = 3.9). However, organic ligands near the 79 N Glacier terminus and in the Westwind Trough were weaker, and therefore less reactive than organic ligands in the Norske Trough and in Fram Strait. Our findings reveal the fundamental mechanism that underpin transport of dissolved-Fe (DFe) from the 79 N Glacier to Fram Strait, less reactive ligands will reduce Fe solubility. Accordingly, a portion of the glacial DFe will not be transported over the shelf into the ocean. The lower ligand binding strength in the outflow results in a higher inorganic Fe concentration, [Fe?], which is more prone to precipitation and/or scavenging than Fe complexed with stronger ligands. Ongoing changes in the Arctic and sub-Arctic Oceans will influence both terrestrially derived and in-situ produced Fe-binding ligands, and therefore will have consequences for Fe solubility and availability to microbial populations and Fe cycling in Fram Strait. (2019-12-05)
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Subject
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Earth and Environmental Sciences
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Keyword
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Earth and Environmental Sciences
GEOTRACES
Fram strait
Arctic
Iron Organic ligands
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Producer
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Gerringa, Loes (Royal Netherlands Institute for Sea Research)
Middag, Rob (NIOZ)
Gledhill, Martha (GEOMAR)
Reichart, Gert-Jan (NIOZ)
Lodeiro, Pablo (GEOMAR)
Achterberg, Eric (GEOMAR)
Ardiningsih, Indah (NIOZ)
Krisch, Stephan (GEOMAR)
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Production Date
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2020-05-01
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Contributor
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Hosting Institution : NIOZ Royal Netherlands Institute for Sea Research in cooperation with Utrecht University
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Grant Information
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Indonesia Endowment Fund for Education (LPDP) (Doctoral scholarship Indah Ardiningsih): 20160522026533
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Distributor
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Research Data Management (NIOZ Royal Netherlands Institute for Sea Research)
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Distribution Date
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2019-12-05
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Depositor
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loes gerringa
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Deposit Date
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2019-12-05
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Date of Collection
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Start: 2016-07-02 ; End: 2016-08-31
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