 |
| Titel |
Ice-shelf – ocean interactions at Fimbul Ice Shelf, Antarctica from oxygen isotope ratio measurements |
| VerfasserIn |
M. R. Price, K. J. Heywood, K. W. Nicholls |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1812-0784
|
| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 4, no. 1 ; Nr. 4, no. 1 (2008-03-05), S.89-98 |
| Datensatznummer |
250001536
|
| Publikation (Nr.) |
 copernicus.org/os-4-89-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
| Melt water from the floating ice shelves at the margins of the southeastern
Weddell Sea makes a significant contribution to the fresh water budget of
the region. In February 2005 a multi-institution team conducted an
oceanographic campaign at Fimbul Ice Shelf on the Greenwich Meridian as part
of the Autosub Under Ice programme. This included a mission of the
autonomous submarine Autosub 25 km into the cavity beneath Fimbul Ice Shelf,
and a number of ship-based hydrographic sections on the continental shelf
and adjacent to the ice shelf front. The measurements reveal two significant
sources of glacial melt water at Fimbul Ice Shelf: the main cavity under the
ice shelf and an ice tongue, Trolltunga, that protrudes from the main ice
front and out over the continental slope into deep water. Glacial melt water
is concentrated in a 200 m thick Ice Shelf Water (ISW) layer below the base
of the ice shelf at 150–200 m, with a maximum glacial melt concentration of
up to 1.16%. Some glacial melt is found throughout the water column, and
much of this is from sources other than Fimbul Ice Shelf. However, at least
0.2% of the water in the ISW layer cannot be accounted for by other
processes and must have been contributed by the ice shelf. Just downstream
of Fimbul Ice Shelf we observe locally created ISW mixing out across the
continental slope. The ISW formed here is much less dense than that formed
in the southwest Weddell Sea, and will ultimately contribute a freshening
(and reduction in δ18O) to the upper 100–150 m of the water
column in the southeast Weddell Sea. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|