Arctic – Atlantic exchange of the dissolved micronutrients Iron, Manganese, Cobalt, Nickel, Copper and Zinc with a focus on Fram Strait.

Krisch, Stephan , Hopwood, Mark J. , Roig, Stephane, Gerringa, Loes J.A., Middag, Rob, Rutgers van der Loeff, Michiel M., Petrova, Mariia V., Lodeiro, Pablo, Colombo, Manuel, Cullen, Jay T., Jackson, Sarah L., Heimbürger‐Boavida, Lars‐Eric and Achterberg, Eric P. (2022) Arctic – Atlantic exchange of the dissolved micronutrients Iron, Manganese, Cobalt, Nickel, Copper and Zinc with a focus on Fram Strait. Open Access Global Biogeochemical Cycles, 36 (5). e2021GB007191. DOI 10.1029/2021GB007191.

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Abstract

The Arctic Ocean is considered a source of micronutrients to the Nordic Seas and the North Atlantic Ocean through the gateway of Fram Strait. However, there is a paucity of trace element data from across the Arctic Ocean gateways, and so it remains unclear how Arctic and North Atlantic exchange shapes micronutrient availability in the two ocean basins. In 2015 and 2016, GEOTRACES cruises sampled the Barents Sea Opening (GN04, 2015) and Fram Strait (GN05, 2016) for dissolved iron (dFe), manganese (dMn), cobalt (dCo), nickel (dNi), copper (dCu) and zinc (dZn). Together with the most recent synopsis of Arctic-Atlantic volume fluxes, the observed trace element distributions suggest that Fram Strait is the most important gateway for Arctic-Atlantic dissolved micronutrient exchange as a consequence of Intermediate and Deep Water transport. Combining fluxes from Fram Strait and the Barents Sea Opening with estimates for Davis Strait (GN02, 2015) suggests an annual net southward flux of 2.7 ± 2.4 Gg·a-1 dFe, 0.3 ± 0.3 Gg·a-1 dCo, 15.0 ± 12.5 Gg·a-1 dNi and 14.2 ± 6.9 Gg·a-1 dCu from the Arctic towards the North Atlantic Ocean. Arctic-Atlantic exchange of dMn and dZn were more balanced, with a net southbound flux of 2.8 ± 4.7 Gg·a-1 dMn and a net northbound flux of 3.0 ± 7.3 Gg·a-1 dZn. Our results suggest that ongoing changes to shelf inputs and sea ice dynamics in the Arctic, especially in Siberian shelf regions, affect micronutrient availability in Fram Strait and the high latitude North Atlantic Ocean.

Document Type: Article
Funder compliance: DFG: AC 217/1-1
Keywords: Arctic Ocean, Fram Strait, Trace elements, Arctic-Atlantic micronutrient exchange, Flux Budget, GEOTRACES
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
HGF-AWI
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography > Water column biogeochemistry
NIOZ
Main POF Topic: PT6: Marine Life
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2021GB007191
ISSN: 0886-6236
Date Deposited: 13 May 2022 07:41
Last Modified: 17 May 2022 05:40
URI: https://oceanrep.geomar.de/id/eprint/55984

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