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<p class="MsoNormal">Application deadline extended! <o:p></o:p></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">A research opportunity is available at the US EPA in Research Triangle Park, NC.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">During cold and dark wintertime conditions, areas across the United States face serious particulate pollution problems, with increased
violations of the National Ambient Air Quality Standards (NAAQS) set to protect human health. In Fairbanks, AK, for example, particulate matter (PM) is dominated by carbon compounds and sulfate, and these species can originate from both primary (i.e., directly
emitted) and secondary (i.e., chemically formed in the atmosphere) sources. High wintertime PM concentrations can result from a combination of meteorology, chemistry, and emissions, but there remain uncertainties surrounding these high PM episodes and the
best approaches to mitigate the problem. Although the sources and chemical species that dominate contributions to high PM vary throughout the nation, some features including cold temperatures, concentrated pollution layers, and increased wood combustion are
common.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">In order to understand the evolution of chemicals in the atmosphere (and design effective control strategies for those species that may
pose a threat to human and ecosystem health), three-dimensional chemical transport models (CTMs) are often used. The Community Multiscale Air Quality (CMAQ) modeling system, developed and maintained by the U.S. Environmental Protection Agency (EPA), is a
state-of-the-science CTM widely used in both regulatory and research applications.
<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">In this proposed project, the applicant will work with a multidisciplinary team to understand the high wintertime PM problem in the U.S.
The candidate will investigate potential pathways to particulate sulfur, nitrate, ammonium, and organic formation in the atmosphere, with a focus on those pathways that might be relevant in cold, dark wintertime conditions. This may include performing box
modeling to determine promising pathways prior to implementation in CMAQ. The applicant will learn how CMAQ simulates wintertime episodes, how to design sensitivity simulations, and how to analyze the impacts of model developments. The applicant may also
gain experience applying instrumented versions of CMAQ with additional diagnostic capabilities like the Sulfur Tracking Method (STM), Process Analysis (PA), and the Integrated Source Apportionment Method (ISAM).<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">As part of this project, the candidate may learn about:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">• Chemical transport modeling, particularly the development and application of CMAQ<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">• Atmospheric heterogeneous sulfur chemistry<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">• Atmospheric ammonium nitrate formation in the wintertime<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">• Atmospheric organic aerosol partitioning and multigenerational aging<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">• Effectively working both independently and within a diverse team of researchers<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">The mentor for this opportunity is Kathleen Fahey (<a href="mailto:fahey.kathleen@epa.gov"><span style="color:#0D4DB5">fahey.kathleen@epa.gov</span></a>), but it
is expected that the candidate will have an opportunity to work closely with other members of the CMAQ development team as well. The target start date is in September, but
</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#333333;background:white">all start dates are flexible and vary depending on numerous factors. The
</span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">initial appointment is for one year</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#333333;background:white">.</span><span style="font-size:10.5pt;font-family:"Helvetica",sans-serif;color:#333333"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#333333">For more information, including how to apply, see<o:p></o:p></span></p>
<p class="MsoNormal"><a href="https://www.zintellect.com/Opportunity/Details/EPA-ORD-CEMM-AESMD-2020-05">https://www.zintellect.com/Opportunity/Details/EPA-ORD-CEMM-AESMD-2020-05</a><o:p></o:p></p>
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