[pccgrads] GSS TODAY at 5pm in ATG 610: Sarah Dewey

Hilary Palevsky palevsky at u.washington.edu
Wed May 6 09:55:15 PDT 2015


Hello PCC grads!

The spring quarter Graduate Student Seminar continues *today at 5pm in ATG
610*! *Sarah Dewey* will be presenting her research on "Arctic Physics on
the Edge: Development and Implications of a Surface Freshwater Lens in the
Beaufort Sea Seasonal Ice Zone." Check out the full description below!

We have a great lineup of speakers for the rest of the quarter as well, all
at 5pm in ATG 610:
May 20 Leah Johnson Ocean
June 3 Shirley Leung Ocean

Hope to see many of you there!

Cheers,
Hilary, Brad and Greg
**********************************************************************************

*This week's talk:*
Sarah Dewey (Oceanography): "Arctic Physics on the Edge: Development and
Implications of a Surface Freshwater Lens in the Beaufort Sea Seasonal Ice
Zone"

Description: Seasonal Ice Zone Reconnaissance Surveys (SIZRS) of the
Beaufort Sea aboard U.S. Coast Guard Arctic Domain Awareness flights were
made monthly from June to October, 2012 to 2014. In 2012, sea ice extent
reached a record minimum and the SIZRS sampling ranged from complete ice
cover to open water. The seasonal ice zone (SIZ), where ice melts and
reforms annually, encompasses the marginal ice zone (MIZ). Thus SIZRS
tracks interannual MIZ conditions, providing a regional context for
smaller-scale MIZ processes. In addition to its large spatial coverage, the
SIZRS program extends temporal coverage of the SIZ beyond the traditional
season for ship-based observations, and is a good set of measurements for
model validation and climatological comparison.

Observations with Air eXpendable CTDs (AXCTDs) reveal the seasonal
formation of a fresh lens relative to the ice edge. While this lens extends
under the ice edge as the melt season progresses, its presence is
independent of year and latitude north. To test a formation mechanism for
this lens, a 1-D Price-Weller-Pinkel (PWP) model adapted for ice-covered
seas simulates mixing processes in the top 100m of the ocean. Surface
forcing fluxes are taken from the Marginal Ice Zone Modeling and
Assimilation System MIZMAS. PWP output supports local formation of the lens
from ice melt. This lens may have implications for surface geostrophic
circulation as well as for ocean phase change preconditioning. In addition
to the relationship of salinity to the ice edge, those of upper-ocean
temperature and of some atmospheric parameters are also considered.

*What is the GSS, you ask?*
The PCC Graduate Student Seminar (GSS) is organized by graduate students
for graduate students. The series provides an extremely laid back
environment where grad students give 25-35 min presentations on their
research followed by a 20 minutes of questions/discussion on the topic.
It's a great opportunity to see what is going on in climate research with
your fellow students down the hall or across campus. Plus, it you are
interested in presenting, it's a great chance to show off some of your own
research and receive feedback on your work. Presentations should be geared
toward a general scientific audience (of graduate students) with ample
background information so everyone can follow. As always, *be*v*er*ages
will be provided for a minimal donation.

--
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Hilary Palevsky
PhD Candidate, Chemical Oceanography
University of Washington
School of Oceanography
Email: palevsky at u.washington.edu
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