Till sidans topp

Sidansvarig: Webbredaktion
Sidan uppdaterades: 2012-09-11 15:12

Tipsa en vän
Utskriftsversion

Upper Ocean Distribution … - Göteborgs universitet Till startsida
Webbkarta
Till innehåll Läs mer om hur kakor används på gu.se

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

Artikel i vetenskaplig tidskrift
Författare Louise C. Biddle
B. Loose
K. J. Heywood
Publicerad i Journal of Geophysical Research-Oceans
ISSN 2169-9275
Publiceringsår 2019
Publicerad vid Institutionen för marina vetenskaper
Språk en
Länkar dx.doi.org/10.1029/2019jc015133
Ämnesord 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
Ämneskategorier Oceanografi, hydrologi, vattenresurser

Sammanfattning

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.

Sidansvarig: Webbredaktion|Sidan uppdaterades: 2012-09-11
Dela:

På Göteborgs universitet använder vi kakor (cookies) för att webbplatsen ska fungera på ett bra sätt för dig. Genom att surfa vidare godkänner du att vi använder kakor.  Vad är kakor?