Spreading of Greenland meltwaters in the ocean revealed by noble gases
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 7705–7713, doi:10.1002/2015GL065003. We present the fi...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/7631 2023-05-15T16:26:28+02:00 Spreading of Greenland meltwaters in the ocean revealed by noble gases Beaird, Nicholas Straneo, Fiamma Jenkins, William J. 2015-09-30 application/pdf https://hdl.handle.net/1912/7631 en_US eng John Wiley & Sons https://doi.org/10.1002/2015GL065003 Geophysical Research Letters 42 (2015): 7705–7713 https://hdl.handle.net/1912/7631 doi:10.1002/2015GL065003 Geophysical Research Letters 42 (2015): 7705–7713 doi:10.1002/2015GL065003 Glacial melt Noble gases Tracers Meltwater Greenland Fjord Article 2015 ftwhoas https://doi.org/10.1002/2015GL065003 2022-05-28T22:59:27Z Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 7705–7713, doi:10.1002/2015GL065003. We present the first noble gas observations in a proglacial fjord in Greenland, providing an unprecedented view of surface and submarine melt pathways into the ocean. Using Optimum Multiparameter Analysis, noble gas concentrations remove large uncertainties inherent in previous studies of meltwater in Greenland fjords. We find glacially modified waters with submarine melt concentrations up to 0.66 ± 0.09% and runoff 3.9 ± 0.29%. Radiogenic enrichment of Helium enables identification of ice sheet near-bed melt (0.48 ± 0.08%). We identify distinct regions of meltwater export reflecting heterogeneous melt processes: a surface layer of both runoff and submarine melt and an intermediate layer composed primarily of submarine melt. Intermediate ocean waters carry the majority of heat to the fjords' glaciers, and warmer deep waters are isolated from the ice edge. The average entrainment ratio implies that ocean water masses are upwelled at a rate 30 times the combined glacial meltwater volume flux. We gratefully acknowledge funding from WHOI's Ocean and Climate Change Institute, the Doherty Postdoctoral Scholarship, and ship time from the Advanced Climate Dynamics Summer School (SiU grant NNA-2012/10151). 2016-03-30 Article in Journal/Newspaper Greenland Ice Sheet Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Greenland Geophysical Research Letters 42 18 7705 7713 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Glacial melt Noble gases Tracers Meltwater Greenland Fjord |
spellingShingle |
Glacial melt Noble gases Tracers Meltwater Greenland Fjord Beaird, Nicholas Straneo, Fiamma Jenkins, William J. Spreading of Greenland meltwaters in the ocean revealed by noble gases |
topic_facet |
Glacial melt Noble gases Tracers Meltwater Greenland Fjord |
description |
Author Posting. © American Geophysical Union, 2015. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 42 (2015): 7705–7713, doi:10.1002/2015GL065003. We present the first noble gas observations in a proglacial fjord in Greenland, providing an unprecedented view of surface and submarine melt pathways into the ocean. Using Optimum Multiparameter Analysis, noble gas concentrations remove large uncertainties inherent in previous studies of meltwater in Greenland fjords. We find glacially modified waters with submarine melt concentrations up to 0.66 ± 0.09% and runoff 3.9 ± 0.29%. Radiogenic enrichment of Helium enables identification of ice sheet near-bed melt (0.48 ± 0.08%). We identify distinct regions of meltwater export reflecting heterogeneous melt processes: a surface layer of both runoff and submarine melt and an intermediate layer composed primarily of submarine melt. Intermediate ocean waters carry the majority of heat to the fjords' glaciers, and warmer deep waters are isolated from the ice edge. The average entrainment ratio implies that ocean water masses are upwelled at a rate 30 times the combined glacial meltwater volume flux. We gratefully acknowledge funding from WHOI's Ocean and Climate Change Institute, the Doherty Postdoctoral Scholarship, and ship time from the Advanced Climate Dynamics Summer School (SiU grant NNA-2012/10151). 2016-03-30 |
format |
Article in Journal/Newspaper |
author |
Beaird, Nicholas Straneo, Fiamma Jenkins, William J. |
author_facet |
Beaird, Nicholas Straneo, Fiamma Jenkins, William J. |
author_sort |
Beaird, Nicholas |
title |
Spreading of Greenland meltwaters in the ocean revealed by noble gases |
title_short |
Spreading of Greenland meltwaters in the ocean revealed by noble gases |
title_full |
Spreading of Greenland meltwaters in the ocean revealed by noble gases |
title_fullStr |
Spreading of Greenland meltwaters in the ocean revealed by noble gases |
title_full_unstemmed |
Spreading of Greenland meltwaters in the ocean revealed by noble gases |
title_sort |
spreading of greenland meltwaters in the ocean revealed by noble gases |
publisher |
John Wiley & Sons |
publishDate |
2015 |
url |
https://hdl.handle.net/1912/7631 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Geophysical Research Letters 42 (2015): 7705–7713 doi:10.1002/2015GL065003 |
op_relation |
https://doi.org/10.1002/2015GL065003 Geophysical Research Letters 42 (2015): 7705–7713 https://hdl.handle.net/1912/7631 doi:10.1002/2015GL065003 |
op_doi |
https://doi.org/10.1002/2015GL065003 |
container_title |
Geophysical Research Letters |
container_volume |
42 |
container_issue |
18 |
container_start_page |
7705 |
op_container_end_page |
7713 |
_version_ |
1766015387083735040 |