<div dir="ltr"><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Throstur Thorsteinsson</b> <span dir="ltr"><<a href="mailto:ThrosturTh@hi.is">ThrosturTh@hi.is</a>></span><br>Date: Wed, Jul 5, 2017 at 10:16 AM<br>Subject: [Jhi] Mid-study lecture by Mary K. Butwin Friday 7 July at 10 in Askja 3rd floor<br>To: <a href="mailto:jhi@listar.hi.is">jhi@listar.hi.is</a><br><br><br><div dir="ltr"><div><span style="font-family:verdana,sans-serif;font-size:13px">Hi all.</span><br><div class="gmail_quote"><div><div style="font-family:georgia,serif"><div style="font-family:arial,sans-serif;font-size:13px"><font face="verdana, sans-serif"><br>On Friday 7 July at 10:00, in the lecture room on the 3rd floor of Askja, Mary K. Butwin will give the mid-term lecture for her PhD studies.<br><br>The title of the presentation is </font></div><div style="font-family:arial,sans-serif;font-size:13px"><font face="verdana, sans-serif">"</font><span style="font-family:-webkit-standard;text-align:justify;font-size:16px">Suspension of Dust and Ash in Iceland</span><span style="font-family:verdana,sans-serif">"</span></div><div style="font-family:arial,sans-serif;font-size:13px" dir="auto"><font face="verdana, sans-serif"><br></font></div><div style="font-family:arial,sans-serif;font-size:13px" dir="auto"><font face="verdana, sans-serif">Short abstract:</font></div><div style="font-family:arial,sans-serif;font-size:13px" dir="auto"><p class="m_3778687387710434468m_-6905712023594093795s4" style="margin-top:0px;margin-bottom:0px;line-height:21.600000381469727px;text-align:justify;font-family:-webkit-standard;font-size:18px"><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px">Roughly a fifth of Iceland’s surface is loose material that originated from volcanic and glacial activity. With </span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px">the frequent windy conditions in</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px"> Iceland this loose material can be easily suspended into the atmosphere. Suspension of particulate matter (PM) decreases air quality and can pose a health risk to those with frequent exposure. The frequency of exposure is highly dependent on time since</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px"> the last ash rich eruption, as well as</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px"> weather conditions. The largest health risk to individuals is with PM with a diameter of 10</span><span class="m_3778687387710434468m_-6905712023594093795s5" style="line-height:21.600000381469727px;font-family:Symbol">m</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px">m and less and with elongated grains</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px">,</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px"> as they have a greater impact on the respiratory system</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px">. The elongation of grains is common with volcanic</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px"> ash, but also of surface material in Iceland.</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px"> Size distribution of volcanic ash has been done with the majority of volcanic eruptions in Iceland; however, the size distribution of the surface has not</span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px">. </span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px">This surface material is what is frequently suspended in dust events that throughout the country. </span></p><p class="m_3778687387710434468m_-6905712023594093795s4" style="margin-top:0px;margin-bottom:0px;line-height:21.600000381469727px;text-align:justify;font-family:-webkit-standard;font-size:18px"><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px">Lava from </span><span class="m_3778687387710434468m_-6905712023594093795s2" style="line-height:21.600000381469727px">Holuhraun/</span><span class="m_3778687387710434468m_-6905712023594093795s6" style="line-height:21.600000381469727px;color:rgb(34,34,34);background-color:rgb(255,255,255)">Bárðarbunga</span><span class="m_3778687387710434468m_-6905712023594093795s6" style="line-height:21.600000381469727px;color:rgb(34,34,34);background-color:rgb(255,255,255)"> eru<wbr>ption in 2014-2015 covered a quarter of Iceland’s deserts greatly decreasing the availability of loose material. With numerical modeling it may be possible to determine the impact the new lava field has on the frequency of PM suspension. In theory it should decrease the amount and frequency of suspended PM. The heat from the lava creates a strong thermal gradient and may </span><span class="m_3778687387710434468m_-6905712023594093795s6" style="line-height:21.600000381469727px;color:rgb(34,34,34);background-color:rgb(255,255,255)">affect</span><span class="m_3778687387710434468m_-6905712023594093795s6" style="line-height:21.600000381469727px;color:rgb(34,34,34);background-color:rgb(255,255,255)"> the wind field</span><span class="m_3778687387710434468m_-6905712023594093795s6" style="line-height:21.600000381469727px;color:rgb(34,34,34);background-color:rgb(255,255,255)">, which may change the suspension of PM.</span></p><font face="verdana, sans-serif"><br>Sincerely, </font></div><div style="font-family:arial,sans-serif;font-size:13px"><font face="verdana, sans-serif">Throstur.</font></div></div><div><div class="m_3778687387710434468m_-6905712023594093795m_1428082020211179186gmail_signature"><div><|><span style="color:rgb(51,204,0)"><br></span></div></div></div></div></div></div></div>
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<br></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div>Deirdre Clark, PhD Research Fellow<br></div>University of Iceland | Háskóli Íslands<br></div><div>Institute of Earth Sciences<br></div><div>Sturlugata 7, Askja, Room 235<br></div><div>101 Reykjavík, Iceland<br><br></div><div>+354 525 4275 (Office)<br>+354 690 5745 (Mobile)<br></div><div><a href="mailto:dec2@hi.is" target="_blank">dec2@hi.is</a><br></div></div></div></div></div>
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