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Subglacial discharge plume behaviour revealed by CTD-instrumented ringed seals

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Everett_2018_SR_CTD_CC.pdf (7.666Mb)
Date
07/09/2018
Author
Everett, Alistair
Kohler, Jack
Sundfjord, Arild
Kovacs, Kit
Torsvik, Tomas
Pramanik, Ankit
Boehme, Lars
Lydersen, Christian
Keywords
QH301 Biology
NDAS
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Abstract
Subglacial discharge plumes increase submarine melting of marine-terminating glaciers significantly; however, in-situ data on their properties and behaviour are limited. We present oceanographic data collected by ringed seals (Pusa hispida) instrumented with GPS-equipped conductivity-temperature-depth satellite relay data loggers (GPS-CTD-SRDLs) in Kongsfjorden, Svalbard, during 2012. The seals foraged just outside the plumes and collected hydrographic data from within the plumes’ upwelling cores as they returned to the surface. The seals encountered water with fractions of subglacial discharge as high as 27% at 60 m below the ocean surface. The ringed seals responded rapidly to spatial and temporal variations in subglacial discharge at the glacier terminus, suggesting that prey becomes available quickly following the appearance of plumes. The seals’ dive locations were used to monitor the presence of plumes over a four-month period. High surface runoff from Kronebreen catchment created strong plumes, but weak plumes were present even during periods of low surface runoff. The continued retreat of Kronebreen, and other tidewater glaciers, will lead to the loss of these marine-termini as the glaciers retreat onto land. The techniques presented here improve our understanding of the drivers of glacial retreat and the implications of future habitat loss for glacier-associated birds and mammals.
Citation
Everett , A , Kohler , J , Sundfjord , A , Kovacs , K , Torsvik , T , Pramanik , A , Boehme , L & Lydersen , C 2018 , ' Subglacial discharge plume behaviour revealed by CTD-instrumented ringed seals ' , Scientific Reports , vol. 8 , 13467 . https://doi.org/10.1038/s41598-018-31875-8
Publication
Scientific Reports
Status
Peer reviewed
DOI
https://doi.org/10.1038/s41598-018-31875-8
ISSN
2045-2322
Type
Journal article
Rights
© The Author(s) 2018. Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Description
This research was supported by the Norwegian Polar Institute’s Centre for Ice, Climate and Ecosystems (ICE) and the Research Council of Norway. Some of this financial support was derived from the TIGRIF (RCN project number 243808/E40) and TW-ICE research programmes. AP was also funded by The Ministry of Earth Sciences, India, Grant/Award number: MoES/16/22/12-RDEAS (PhD fellowship-NPI).
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/16038

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