<br><br>---------- Forwarded message ----------<br>From: <b>Cappo, Sabinna</b> <br>Date: Monday, April 29, 2013<br>Subject: TODAY, 4pm, Haller Hall (Geo102): EPS colloquium series with Dr. Robin Wordsworth (U of Chicago)<br>
To: "Cappo, Sabinna" <<a href="mailto:scappo@fas.harvard.edu">scappo@fas.harvard.edu</a>><br><br><br>
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<span style="font-size:24px">The Department of Earth and Planetary Sciences</span></p>
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<span style="font-size:24px">Harvard University</span></p>
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<b style="font-size:36px"><span style="font-family:Helvetica">April 29th Colloquium Series Presents</span><span style="font-family:Helvetica"></span></b></p>
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<font face="Helvetica"><span style="font-size:36px"><b>Dr. Robin Wordsworth</b></span></font></p>
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<b style="font-size:36px"><span style="font-family:Helvetica"><font color="#8b238b">From University of Chicago</font></span></b></p>
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<font color="#007f00"><i><b><font style="font-family:Calibri,sans-serif;font-size:36px">"3D Modeling of the Martian Climate during the Late Noachian</font></b></i></font><font color="#007f00"><i><b><font style="font-family:Calibri,sans-serif;font-size:36px">"</font></b></i></font></p>
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<div style="text-align:center"><b style="font-size:18px">Abstract:</b></div>
<div style="text-align:center;font-size:14px"><span style="font-family:Calibri;font-size:11pt;line-height:17px">The image of early Mars as warm and wet, with rivers, oceans and potentially microbial life, has captured the imagination of scientists ever since
images of fluvial erosion were first sent back by spacecraft. However, the environmental conditions that caused these features remain poorly understood, in large part because of the climate challenges raised by Mars’ orbital distance and the faintness of the
young Sun. Various solutions have been proposed over the years, but most previous modeling of early Mars warming mechanisms has been limited to simple 1D climate calculations.</span></div>
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Here I discuss new 3D GCM simulations that were performed to investigate the Martian climate during the late Noachian (~3.8 Ga). The simulations incorporate self-consistent representations of the cycles of both CO2 and water, including correlated-k radiative
transfer for atmospheric gases and clouds. Results show that a pure CO2-H2O greenhouse alone is incapable of warming early Mars above global mean temperatures of around 240 K, even when the climate effects of CO2 clouds are taken into account. Nonetheless, for
atmospheric pressures greater than a fraction of a bar, adiabatic cooling causes water ice transport to the valley network regions under a wide range of conditions. In addition, an extended water ice cap forms on the southern pole, approximately corresponding
to the location of the Noachian/Hesperian era Dorsa Argentea Formation. I suggest that when combined with episodic warming events, this generic transport mechanism may be sufficient to account for most of the fluvial geology without the need to invoke additional
long-term warming mechanisms or an early warm, wet Mars. Finally, in light of these results I discuss what Mars can teach us about the potential diversity of exoplanet climates and planetary habitability in general.</p>
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<span style="font-size:26px">Monday, April 29th, 2013</span></p>
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<span style="font-size:26px">4:00 p.m., Haller Hall (Geo-Museum 102)</span><span style="font-size:14pt"></span></p>
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<i><span style="font-size:14pt">Reception to follow at Hoffman Lab 4<sup>th</sup> floor</span></i></p>
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<br><br><br>-- <br>Sarah T. Stewart-Mukhopadhyay<div>Professor of Earth & Planetary Sciences, Harvard University<br>617.863.0423, <a href="http://www.fas.harvard.edu/~planets/sstewart/" target="_blank">www.shock.eps.harvard.edu</a></div>
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