Linking glacially modified waters to catchment-scale subglacial discharge using autonomous underwater vehicle observations
Measurements of near-ice (< 200 m) hydrography and near-terminus subglacial hydrology are lacking, due in large part to the difficulty in working at the margin of calving glaciers. Here we pair detailed hydrographic and bathymetric measurements collected with an autonomous underwater vehicle as c...
Published in: | The Cryosphere |
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ftcopernicus:oai:publications.copernicus.org:tc31672 2023-05-15T16:21:29+02:00 Linking glacially modified waters to catchment-scale subglacial discharge using autonomous underwater vehicle observations Stevens, Laura A. Straneo, Fiamma Das, Sarah B. Plueddemann, Albert J. Kukulya, Amy L. Morlighem, Mathieu 2018-09-27 application/pdf https://doi.org/10.5194/tc-10-417-2016 https://tc.copernicus.org/articles/10/417/2016/ eng eng doi:10.5194/tc-10-417-2016 https://tc.copernicus.org/articles/10/417/2016/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-10-417-2016 2020-07-20T16:24:15Z Measurements of near-ice (< 200 m) hydrography and near-terminus subglacial hydrology are lacking, due in large part to the difficulty in working at the margin of calving glaciers. Here we pair detailed hydrographic and bathymetric measurements collected with an autonomous underwater vehicle as close as 150 m from the ice–ocean interface of the Saqqarliup sermia–Sarqardleq Fjord system, West Greenland, with modeled and observed subglacial discharge locations and magnitudes. We find evidence of two main types of subsurface glacially modified water (GMW) with distinct properties and locations. The two GMW locations also align with modeled runoff discharged at separate locations along the grounded margin corresponding with two prominent subcatchments beneath Saqqarliup sermia. Thus, near-ice observations and subglacial discharge routing indicate that runoff from this glacier occurs primarily at two discrete locations and gives rise to two distinct glacially modified waters. Furthermore, we show that the location with the largest subglacial discharge is associated with the lighter, fresher glacially modified water mass. This is qualitatively consistent with results from an idealized plume model. Text glacier Greenland Copernicus Publications: E-Journals Greenland Sarqardleq ENVELOPE(-53.100,-53.100,68.233,68.233) The Cryosphere 10 1 417 432 |
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Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Measurements of near-ice (< 200 m) hydrography and near-terminus subglacial hydrology are lacking, due in large part to the difficulty in working at the margin of calving glaciers. Here we pair detailed hydrographic and bathymetric measurements collected with an autonomous underwater vehicle as close as 150 m from the ice–ocean interface of the Saqqarliup sermia–Sarqardleq Fjord system, West Greenland, with modeled and observed subglacial discharge locations and magnitudes. We find evidence of two main types of subsurface glacially modified water (GMW) with distinct properties and locations. The two GMW locations also align with modeled runoff discharged at separate locations along the grounded margin corresponding with two prominent subcatchments beneath Saqqarliup sermia. Thus, near-ice observations and subglacial discharge routing indicate that runoff from this glacier occurs primarily at two discrete locations and gives rise to two distinct glacially modified waters. Furthermore, we show that the location with the largest subglacial discharge is associated with the lighter, fresher glacially modified water mass. This is qualitatively consistent with results from an idealized plume model. |
format |
Text |
author |
Stevens, Laura A. Straneo, Fiamma Das, Sarah B. Plueddemann, Albert J. Kukulya, Amy L. Morlighem, Mathieu |
spellingShingle |
Stevens, Laura A. Straneo, Fiamma Das, Sarah B. Plueddemann, Albert J. Kukulya, Amy L. Morlighem, Mathieu Linking glacially modified waters to catchment-scale subglacial discharge using autonomous underwater vehicle observations |
author_facet |
Stevens, Laura A. Straneo, Fiamma Das, Sarah B. Plueddemann, Albert J. Kukulya, Amy L. Morlighem, Mathieu |
author_sort |
Stevens, Laura A. |
title |
Linking glacially modified waters to catchment-scale subglacial discharge using autonomous underwater vehicle observations |
title_short |
Linking glacially modified waters to catchment-scale subglacial discharge using autonomous underwater vehicle observations |
title_full |
Linking glacially modified waters to catchment-scale subglacial discharge using autonomous underwater vehicle observations |
title_fullStr |
Linking glacially modified waters to catchment-scale subglacial discharge using autonomous underwater vehicle observations |
title_full_unstemmed |
Linking glacially modified waters to catchment-scale subglacial discharge using autonomous underwater vehicle observations |
title_sort |
linking glacially modified waters to catchment-scale subglacial discharge using autonomous underwater vehicle observations |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-10-417-2016 https://tc.copernicus.org/articles/10/417/2016/ |
long_lat |
ENVELOPE(-53.100,-53.100,68.233,68.233) |
geographic |
Greenland Sarqardleq |
geographic_facet |
Greenland Sarqardleq |
genre |
glacier Greenland |
genre_facet |
glacier Greenland |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-10-417-2016 https://tc.copernicus.org/articles/10/417/2016/ |
op_doi |
https://doi.org/10.5194/tc-10-417-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
1 |
container_start_page |
417 |
op_container_end_page |
432 |
_version_ |
1766009497560547328 |