[pccgrads] FW: Antarctic PO/ICE seminar Tuesday 16th Sept 2:30pm - Pierre Dutrieux, BAS

UW PCC uwpcc at uw.edu
Mon Sep 15 12:48:15 PDT 2014



>>>>>> APL Special Seminar <<<<<<

>>>>>> NOTE Date - TOMORROW <<<<<<


Speaker: Pierre Dutrieux
British Antarctic Survey, Polar Oceans

Title: OCEANIC MELTING OF THE PINE ISLAND ICE SHELF: Tales from a Yellow
Submarine

Time: Tuesday, September 16, 2:30 PM <----------- NOTE Day

(Coffee/Tea, Cookies and Conversation at 2:00PM)

Place: APL Hardisty Conference Center

Abstract:

Pine Island Glacier has thinned and accelerated over recent decades,
significantly contributing to global sea-level rise. Increased oceanic
melting of its ice shelf is thought to have triggered those changes.
This presentation will cover a range of studies over the past 5 years
involving observations and numerical modeling of this complex ice-ocean
system.

Observations made by the autonomous submarine Autosub beneath the Pine
Island ice shelf revealed key features in the seabed and ice base
geometries. These features constrain and are modified by oceanic melt, and
imply that oceanic melting varies significantly over broad temporal and
spatial scales. At annual to interannual time scales, melting ismodulated by
large fluctuations in the ocean heat available in the adjacent bay and
enhanced sensitivity to water temperatures at intermediate depth, as a
seabed ridge blocks the deepest and warmest waters from reaching the
thickest ice. This oceanic variability is partly attributable to atmospheric
forcing associated with ENSO.

The base of the ice is not smooth, but harbours kilometre-wide channels that
are enhanced by, and constrain, oceanic melt. The channel apexes are
crevassed, and their flanks are marked by peculiar, meters-scale terraced
landscaped that are also shown to modulate melting. Both atmospheric
variability and local ice shelf and seabed geometry play fundamental roles
in determining the response of the Antarctic Ice Sheet to climate.

**************************************************************************!
******

UNIVERSITY STUDENTS, STAFF AND FACULTY WELCOME!

****************************************************************************
****

Enter main (east) entrance to the Henderson Hall, and ask at desk or follow
signs to the Conference Center on the 6th floor.

To request disability accommodations, please contact the Office of the ADA
Coordinator; voice: 543-6450, E-mail: access\@u.washington.edu
****************************************************************************
****


--
-------------------------------------------------------------------
Dr Rebecca A Woodgate
Applied Physics Laboratory Tel: (206)-221-3268
University of Washington Fax: (206)-543-6785
1013 NE 40th Street, Seattle Email: woodgate at apl.washington.edu
Washington 98105-6698, U.S.A. http://psc.apl.washington.edu/HLD
-------------------------------------------------------------------


_______________________________________________
Pcc_all mailing list
Pcc_all at u.washington.edu
https://mailman1.u.washington.edu/mailman/listinfo/pcc_all



More information about the pccgrads mailing list