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Total dissolved zinc in the upper water column of the subarctic north east Pacific

Total dissolved zinc in the upper water column of the subarctic north east Pacific
Total dissolved zinc in the upper water column of the subarctic north east Pacific
Total dissolved Zn concentrations are reported for winter and summer along the E-W line P transect and for summer along S-N line Z transect extending from Ocean Station Papa (OSP; 50[deg]N 145[deg]W) to the respective shelf waters. Surface-water 10 nM concentrations ranged from 0.04 nM in the open ocean to 0.9 nM at the Canadian shelf station. A clear gradient is evident, with dissolved Zn concentrations decreasing with increasing distance from shore along the E-W transect in both summer and winter. No consistent trend was observed along the S-N transect. Low concentrations of Zn (0.05-0.07 nM) were observed in near-surface water at OSP in winter. The vertical distribution of dissolved Zn is oceanographically consistent, showing a silicon-like vertical profile. Concentrations of silicic acid and dissolved Zn at depth are higher than those at equivalent depths in the Atlantic, as expected from deep-water circulation patterns and build-up in concentration of these elements. Dissolved Zn/Si ratios in the upper 200 m indicate a trend of decreasing with distance from shore, which infers a decoupling between dissolved Zn and silicic acid in the upper ocean. We hypothesise that the silicon-like profile of dissolved Zn is a result of recycling from relatively biologically resistant organic particulate phases, that leads to profiles very similar to those of dissolved silicon. Other than at two stations where there is very high primary production, there is no apparent horizontal relationship between total dissolved Zn and chlorophyll a or production
0967-0645
5793-5808
Lohan, M.C.
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Statham, P.J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Crawford, D.W.
1625e56b-d0c8-4c45-b519-094d0e928a63
Lohan, M.C.
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Statham, P.J.
51458f15-d6e2-4231-8bba-d0567f9e440c
Crawford, D.W.
1625e56b-d0c8-4c45-b519-094d0e928a63

Lohan, M.C., Statham, P.J. and Crawford, D.W. (2002) Total dissolved zinc in the upper water column of the subarctic north east Pacific. Deep Sea Research Part II: Topical Studies in Oceanography, 49 (24-25), 5793-5808. (doi:10.1016/S0967-0645(02)00215-1).

Record type: Article

Abstract

Total dissolved Zn concentrations are reported for winter and summer along the E-W line P transect and for summer along S-N line Z transect extending from Ocean Station Papa (OSP; 50[deg]N 145[deg]W) to the respective shelf waters. Surface-water 10 nM concentrations ranged from 0.04 nM in the open ocean to 0.9 nM at the Canadian shelf station. A clear gradient is evident, with dissolved Zn concentrations decreasing with increasing distance from shore along the E-W transect in both summer and winter. No consistent trend was observed along the S-N transect. Low concentrations of Zn (0.05-0.07 nM) were observed in near-surface water at OSP in winter. The vertical distribution of dissolved Zn is oceanographically consistent, showing a silicon-like vertical profile. Concentrations of silicic acid and dissolved Zn at depth are higher than those at equivalent depths in the Atlantic, as expected from deep-water circulation patterns and build-up in concentration of these elements. Dissolved Zn/Si ratios in the upper 200 m indicate a trend of decreasing with distance from shore, which infers a decoupling between dissolved Zn and silicic acid in the upper ocean. We hypothesise that the silicon-like profile of dissolved Zn is a result of recycling from relatively biologically resistant organic particulate phases, that leads to profiles very similar to those of dissolved silicon. Other than at two stations where there is very high primary production, there is no apparent horizontal relationship between total dissolved Zn and chlorophyll a or production

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Published date: 2002
Organisations: Marine Biogeochemistry

Identifiers

Local EPrints ID: 6138
URI: http://eprints.soton.ac.uk/id/eprint/6138
ISSN: 0967-0645
PURE UUID: ce9b1982-c4d5-4b25-9cd3-e1e0e4845faf
ORCID for M.C. Lohan: ORCID iD orcid.org/0000-0002-5340-3108

Catalogue record

Date deposited: 30 Jun 2004
Last modified: 10 Nov 2021 03:32

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Contributors

Author: M.C. Lohan ORCID iD
Author: P.J. Statham
Author: D.W. Crawford

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