[pccgrads] Clara Blättler talk this Friday (1:30, OSB 425)

UW Program On Climate Change uwpcc at uw.edu
Thu Dec 5 11:45:06 PST 2019

As part of the QRC 50th Anniversary Speaker Series, Clara Blättler will be
visiting the School of Oceanography. *Her work on past ocean composition
and ocean carbon span from the Archean to Quaternary.* She will be giving a
talk this Friday (tomorrow) during the usual Chemical Oceanography Seminar.
There are a few meeting times still available if you contact Alex Gagnon (
gagnon at uw.edu)

*An Archive of Glacial Seawater*
Clara Blättler
Assistant Professor
Geophysical Sciences, University of Chicago
Friday, December 6
1:30 pm
425 Ocean Science Building

Recent papers include:
* Constraints on ocean carbonate chemistry and pCO2 in the Archaean and
Palaeoproterozoic. Nature Geoscience 10, 41–45. doi:10.1038/ngeo2844.
* Two-billion-year-old evaporites capture Earth’s great oxidation. Science
360, 320–323. doi:10.1126/science.aar2687.
* Testing Urey’s carbonate–silicate cycle using the calcium isotopic
composition of sedimentary carbonates. Earth and Planetary Science
Letters 479, 241–251. doi:10.1016/j.epsl.2017.09.033.

*Talk title and abstract:*

*An Archive of Glacial Seawater*

Understanding the composition of seawater during the Last Glacial Maximum
(LGM) has been a long-standing target of paleoceanography. Previous
constraints on glacial seawater come from indirect methods, using a variety
of proxy measurements and models to reconstruct properties of interest.
Here, I will describe the unexpected discovery of pore fluids that, for the
first time, appear to represent a direct archive of ancient seawater and to
preserve the salinity and isotopic ratios of seawater from a past glacial
period, likely the LGM.

These pore fluids were extracted from sediment cores from the Maldives
Inner Sea and reveal the presence of several distinct interstitial water
masses. The drillcores were recovered in 2015 during IODP (International
Ocean Discovery Program) Expedition 359 and penetrate late Oligocene to
modern sediments. Pore fluid chemistry shows variation in both conservative
and reactive tracers and suggests that these fluids have been advected
laterally through the Maldives carbonate edifice. The composition of these
fluids carries implications for glacial ocean circulation, water-rock
interaction in platform systems, and preservation of carbonate sedimentary
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