[pccgrads] GSS Tuesday at 5pm in OSB 425: Marie Eide

Hilary Palevsky palevsky at u.washington.edu
Sun Oct 18 20:17:50 PDT 2015

Hello PCC grads!

The first talk of the fall quarter Graduate Student Seminar will be *this
Tuesday, October 20 at 5pm in OSB 425*! *Marie Eide*, who is a visiting
graduate student in Oceanography from the University of Bergen, will be
presenting on "Global Ocean δ13C climatology; the 13C Suess effect and δ13C
corrected for Anthropogenic influences." Check out the full description

Also make sure to add to your calendar the schedule of fabulous GSS
speakers for the rest of the quarter, all at 5pm in OSB 425:
Nov. 3 Marysa Lague
Nov. 17 Ana Ordóñez
Dec. 1 Judy Twedt

Hope to see many of you there!

Hilary, Brad and Greg

*This week's talk:*
Marie Eide (Oceanography) "Global Ocean δ13C climatology; the 13C Suess
effect and δ13C corrected for Anthropogenic influences"

The oceanic 13C/12C ratio (expressed δ13C) is commonly used as a frame of
reference to interpret δ13C variations found in benthic fossil
foraminifera, the primary tracer used to infer past water mass distribution
and ventilation. However, isotopically light anthropogenic CO2 propagates
into the interior ocean, homogenising the oceanic δ13C distribution and
masking natural δ13C gradients and water mass signatures. In order to
correct the anthropogenic overprint and reconstruct the natural δ13C
distribution, we firstly apply a back-calculation technique (Olsen and
Ninnemann, 2010) on data from 25 World Ocean Circulation Experiment cruises
spanning all major oceans. Secondly, these estimates were interpolated over
the global ocean using a multiliear regression technique, and applying the
resultant functions on the WOA gridded climatologies. Our reconstructed
preindustrial δ13C distribution modifies a number of assumptions regarding
past ocean circulation that are based on sedimentary records, it allows us
to quantify the natural processes setting oceanic δ13C, and the
quantification of the magnitude of the decrease allows us to investigate
the relationship between the decrease in δ13C and anthropologic carbon in
the ocean.

*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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