To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

Upper Ocean Distribution … - University of Gothenburg, Sweden Till startsida
Sitemap
To content Read more about how we use cookies on gu.se

Contact form








 


Note! If you want an answer on a question you must specify your email address




Upper Ocean Distribution of Glacial Meltwater in the Amundsen Sea, Antarctica

Journal article
Authors Louise C. Biddle
B. Loose
K. J. Heywood
Published in Journal of Geophysical Research-Oceans
Volume 124
Issue 10
Pages 6854-6870
ISSN 2169-9275
Publication year 2019
Published at Department of marine sciences
Pages 6854-6870
Language en
Links dx.doi.org/10.1029/2019jc015133
Keywords glacial meltwater, Amundsen Sea, noble gases, meltwater pathways, circumpolar deep-water, pine island glacier, continental-shelf, melting, ice, noble-gases, circulation, variability, helium, tracers, driven, Oceanography
Subject categories Oceanography, Hydrology, Water Resources

Abstract

Pine Island Ice Shelf, in the Amundsen Sea, is losing mass due to increased heat transport by warm ocean water penetrating beneath the ice shelf and causing basal melt. Tracing this warm deep water and the resulting glacial meltwater can identify changes in melt rate and the regions most affected by the increased input of this freshwater. Here, optimum multiparameter analysis is used to deduce glacial meltwater fractions from independent water mass characteristics (standard hydrographic observations, (NG), and oxygen isotopes), collected during a ship-based campaign in the eastern Amundsen Sea in February-March 2014. (NG) (neon, argon, krypton, and xenon) and oxygen isotopes are used to trace the glacial melt and meteoric water found in seawater, and we demonstrate how their signatures can be used to rectify the hydrographic trace of glacial meltwater, which provides a much higher-resolution picture. The presence of glacial meltwater is shown to mask the Winter Water properties, resulting in differences between the water mass analyses of up to 4-g/kg glacial meltwater content. This discrepancy can be accounted for by redefining the "pure" Winter Water endpoint in the hydrographic glacial meltwater calculation. The corrected glacial meltwater content values show a persistent signature between 150 and 400 m of the water column across all of the sample locations (up to 535 km from Pine Island Ice Shelf), with increased concentration toward the west along the coastline. It also shows, for the first time, the signature of glacial meltwater flowing off-shelf in the eastern channel.

Page Manager: Webmaster|Last update: 9/11/2012
Share:

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?