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Composition of freshwater in the spring of 2014 on the southern Labrador shelf and slope

Composition of freshwater in the spring of 2014 on the southern Labrador shelf and slope
Composition of freshwater in the spring of 2014 on the southern Labrador shelf and slope
The Labrador Current is an important conduit of freshwater from the Arctic to the interior North Atlantic subpolar gyre. Here we investigate the spatial variability of the freshwater sources over the southern Labrador shelf and slope during May–June 2014. Using measurements of seawater properties such as temperature, salinity, nutrients, and oxygen isotopic composition, we estimate the respective contributions of saline water of Atlantic and Pacific origins, of brines released during sea ice formation, and of freshwater from sea ice melt and meteoric water origins. On the southern Labrador shelf, we find a large brine signal and Pacific water influence indicating a large contribution of water from the Canadian Arctic. The brine signal implies that more than 4 m of sea ice formed upstream, either in the Arctic or in Baffin Bay and the northern Labrador Sea. Over the midshelf and slope at 52°N, we find a stronger influence of slope water from the West Greenland Current with a smaller contribution of Pacific water and no brine signal. Thus, there is advection of water from the slope region to the midshelf between 55°N and 52°N. Very freshwater with high meteoric content is found close to the coast in June 2014. Observations from 1995 and 2008 suggest a higher fraction of brine and Pacific water on the shelf compared to that observed in 2014.
1102–1121
Benetti, M.
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Reverdin, G.
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Lique, C.
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Yashayaev, I.
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Holliday, N.P.
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Tynan, E.
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Torres-Valdes, S.
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Lherminier, P.
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Treguer, P.
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Sarthou, G.
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Benetti, M.
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Reverdin, G.
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Lique, C.
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Yashayaev, I.
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Holliday, N.P.
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Tynan, E.
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Torres-Valdes, S.
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Lherminier, P.
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Treguer, P.
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Sarthou, G.
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Benetti, M., Reverdin, G., Lique, C., Yashayaev, I., Holliday, N.P., Tynan, E., Torres-Valdes, S., Lherminier, P., Treguer, P. and Sarthou, G. (2017) Composition of freshwater in the spring of 2014 on the southern Labrador shelf and slope. Journal of Geophysical Research: Oceans, 122 (2), 1102–1121. (doi:10.1002/2016JC012244).

Record type: Article

Abstract

The Labrador Current is an important conduit of freshwater from the Arctic to the interior North Atlantic subpolar gyre. Here we investigate the spatial variability of the freshwater sources over the southern Labrador shelf and slope during May–June 2014. Using measurements of seawater properties such as temperature, salinity, nutrients, and oxygen isotopic composition, we estimate the respective contributions of saline water of Atlantic and Pacific origins, of brines released during sea ice formation, and of freshwater from sea ice melt and meteoric water origins. On the southern Labrador shelf, we find a large brine signal and Pacific water influence indicating a large contribution of water from the Canadian Arctic. The brine signal implies that more than 4 m of sea ice formed upstream, either in the Arctic or in Baffin Bay and the northern Labrador Sea. Over the midshelf and slope at 52°N, we find a stronger influence of slope water from the West Greenland Current with a smaller contribution of Pacific water and no brine signal. Thus, there is advection of water from the slope region to the midshelf between 55°N and 52°N. Very freshwater with high meteoric content is found close to the coast in June 2014. Observations from 1995 and 2008 suggest a higher fraction of brine and Pacific water on the shelf compared to that observed in 2014.

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Benetti_et_al-2017-Journal_of_Geophysical_Research__Oceans - Version of Record
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Accepted/In Press date: 29 December 2016
e-pub ahead of print date: 13 February 2017
Published date: February 2017
Organisations: National Oceanography Centre, Marine Physics and Ocean Climate

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Local EPrints ID: 407132
URI: https://eprints.soton.ac.uk/id/eprint/407132
PURE UUID: 7b5aef70-206e-4e05-8c99-607e7b06cfef

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Date deposited: 30 Mar 2017 01:06
Last modified: 14 Mar 2019 06:02

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Contributors

Author: M. Benetti
Author: G. Reverdin
Author: C. Lique
Author: I. Yashayaev
Author: N.P. Holliday
Author: E. Tynan
Author: S. Torres-Valdes
Author: P. Lherminier
Author: P. Treguer
Author: G. Sarthou

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