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<p>Dear EOAS,</p>
<p>The first EOAS Colloquium speaker of the Spring semester will be
next <b>Friday, 13 January 2023 at 3 pm in EOA 1050</b><br>
</p>
<p>Host: Angie Knapp - please email to meet with Dr. Conway on Thurs
Jan 12 or Fri Jan 13</p>
<p><br>
</p>
<p><font size="4"><b>Dr. Tim Conway, USF</b></font><br>
</p>
<p><font size="4">"New insights for oceanic iron biogeochemistry
from iron isotopes: 10+ years of the GEOTRACES Program"</font></p>
<p><br>
</p>
<p>Abstract:<br>
</p>
<p>The micronutrient element iron plays a major role in setting the
patterns and distribution of primary production and carbon cycling
across the global oceans. As such, understanding the sources,
sinks, and internal cycling processes that drive the oceanic
distribution of iron is key to unlocking the role of iron in the
global ocean and climate system, whether today, in the geologic
past, or in the 'anthropogenic' future. In the last decade,
stimulated largely by the International GEOTRACES. Program,
dissolved iron isotope analyses of seawater (and source materials)
have emerged as a transformative tool for diagnosing iron sources
to the ocean, and tracking iron through the ocean. In this talk, I
will present an overview of the explosion of new oceanic dissolved
iron concentration and isotope data, as well as several case
studies that show how iron isotopes have revolutionized our
understanding of boundary sources such as atmospheric dust,
underwater volcanoes and vents, and marine sediments, and,
remarkably, how they also show iron can be carried thousands of
kilometers through the ocean.<br>
</p>
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