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<div class="WordSection1">Dear EOAS,<o:p></o:p>
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<p class="MsoPlainText">The first EOAS Colloquium speaker will
be TODAY Friday, 13 January 2023 at<o:p></o:p></p>
<p class="MsoPlainText">3 pm in EOA 1050<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Host: Angie Knapp - please email to meet
with Dr. Conway <o:p></o:p></p>
<p class="MsoPlainText"><font size="5"><o:p> </o:p></font></p>
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<p class="MsoPlainText"><font size="5">Dr. Tim Conway, USF<o:p></o:p></font></p>
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<p class="MsoPlainText"><font size="5">"New insights for oceanic
iron biogeochemistry from iron isotopes: 10+ years of the
GEOTRACES Program"</font><o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Abstract:<o:p></o:p></p>
<p class="MsoPlainText">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<o:p></o:p></p>
<p class="MsoPlainText">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.<o:p></o:p></p>
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