[pccgrads] GSS TODAY at 5pm in ATG 610: Leah Johnson

Hilary Palevsky palevsky at u.washington.edu
Wed May 20 11:02:27 PDT 2015

Hello PCC grads!

The spring quarter Graduate Student Seminar continues *TODAY at 5pm in ATG
610*! *Leah Johnson* will be presenting on "Submesoscale Eddies: Small
process, Big Impact." Check out the full description below!

Also make sure to add to your calendar our final GSS of the quarter, also
at 5pm in ATG 610:
June 3 Shirley Leung Ocean

Hope to see many of you there!

Hilary, Brad and Greg

*This week's talk:*
Leah Johnson (Oceanography): "Submesoscale Eddies: Small process, Big

What’s this whole ‘submesoscale’ thing about? In the past decade,
oceanography has experienced a little revolution into how the field
approaches what is termed “submesoscale” dynamics. In the ocean, these are
processes of O(1km) in length; smaller than mesoscale eddies that we see
off the gulf stream, but larger than small processes like turbulent mixing.
They are usually (but not always) associated with upper ocean dynamics and
sharp lateral density gradients (ie fronts), which are ubiquitous in the
upper ocean. A leading order process that occurs in the submesoscale range
is baroclinic instability. This process ultimately transforms sharp lateral
density gradients into a vertical stratification. One submesoscale front
would stratify the upper ocean locally, yet the slumping of a field of
submesoscale fronts could influence large scale stratification. This
suggests the importance of this small process on large scale upper ocean
biology and ocean-air heat and gas exchange. This presentation will take a
‘101’ approach at describing the process of submesoscale instability and
summarize recent studies that indicate its importance on the large scale
physical and biogeochemical environment.

*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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