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The distribution of reactive iron in northern Gulf of Alaska coastal waters

The distribution of reactive iron in northern Gulf of Alaska coastal waters
The distribution of reactive iron in northern Gulf of Alaska coastal waters

Coastal waters in the northern Gulf of Alaska (GoA) are considered iron-rich and nitrate-poor, in contrast to the iron-poor, high-nitrate, low chlorophyll (HNLC) waters of the central GoA. The degree of mixing between these two regimes, enhanced by mesoscale eddies, is essential to the high productivity observed in the region. As part of a study on iron delivery to the central GoA via mesoscale eddies, extensive work was focused on characterizing the coastal endmember, the Alaska Coastal Current. In surface Alaskan coastal waters between Yakutat and the Kenai Peninsula, dissolved iron concentrations ranged from 0.5 to 4.1. nM with an average of ~. 2. nM. In contrast, leachable particulate iron concentrations were much higher and more variable, ranging from over 1 μM in the Alsek River plume to less than 5. nM at the base of Cook Inlet. Cross-shelf transport of both surface and subsurface dissolved iron and leachable particulate iron was observed. Throughout the study area, leachable particulate iron values were at least an order of magnitude higher than dissolved values, suggesting that the system's ability to solubilize this large concentration of leachable particulate iron is overwhelmed by the massive input of glacial-derived particulate iron. Nevertheless, suspended leachable particulate iron remains available for exchange to the dissolved phase and is suggested to maintain a relatively constant (~. 2. nM) source of dissolved iron in the coastal GoA.

Alaska, Glaciers, Gulf of Alaska, Iron, Nitrate, Suspended particulate matter, USA
0304-4203
187-199
Lippiatt, Sherry M.
88a7b0f6-f120-4a54-86fe-ce0fe9081b93
Lohan, Maeve C.
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Bruland, Kenneth W.
f3e947c6-f9b7-435c-ac84-b3476306a368
Lippiatt, Sherry M.
88a7b0f6-f120-4a54-86fe-ce0fe9081b93
Lohan, Maeve C.
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Bruland, Kenneth W.
f3e947c6-f9b7-435c-ac84-b3476306a368

Lippiatt, Sherry M., Lohan, Maeve C. and Bruland, Kenneth W. (2010) The distribution of reactive iron in northern Gulf of Alaska coastal waters. Marine Chemistry, 121 (1-4), 187-199. (doi:10.1016/j.marchem.2010.04.007).

Record type: Article

Abstract

Coastal waters in the northern Gulf of Alaska (GoA) are considered iron-rich and nitrate-poor, in contrast to the iron-poor, high-nitrate, low chlorophyll (HNLC) waters of the central GoA. The degree of mixing between these two regimes, enhanced by mesoscale eddies, is essential to the high productivity observed in the region. As part of a study on iron delivery to the central GoA via mesoscale eddies, extensive work was focused on characterizing the coastal endmember, the Alaska Coastal Current. In surface Alaskan coastal waters between Yakutat and the Kenai Peninsula, dissolved iron concentrations ranged from 0.5 to 4.1. nM with an average of ~. 2. nM. In contrast, leachable particulate iron concentrations were much higher and more variable, ranging from over 1 μM in the Alsek River plume to less than 5. nM at the base of Cook Inlet. Cross-shelf transport of both surface and subsurface dissolved iron and leachable particulate iron was observed. Throughout the study area, leachable particulate iron values were at least an order of magnitude higher than dissolved values, suggesting that the system's ability to solubilize this large concentration of leachable particulate iron is overwhelmed by the massive input of glacial-derived particulate iron. Nevertheless, suspended leachable particulate iron remains available for exchange to the dissolved phase and is suggested to maintain a relatively constant (~. 2. nM) source of dissolved iron in the coastal GoA.

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More information

Published date: August 2010
Keywords: Alaska, Glaciers, Gulf of Alaska, Iron, Nitrate, Suspended particulate matter, USA
Organisations: Marine Biogeochemistry, Southampton Marine & Maritime Institute

Identifiers

Local EPrints ID: 406473
URI: http://eprints.soton.ac.uk/id/eprint/406473
ISSN: 0304-4203
PURE UUID: d861cedc-a497-49e1-bc19-bd71285e7ea8
ORCID for Maeve C. Lohan: ORCID iD orcid.org/0000-0002-5340-3108

Catalogue record

Date deposited: 18 Mar 2017 02:20
Last modified: 07 Oct 2020 02:02

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