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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>Jennifer L. Lewicki</dc:creator>
  <dc:date>2021</dc:date>
  <dc:description>&lt;div id="abstracts" class="Abstracts u-font-serif"&gt;&lt;div id="ab0005" class="abstract author" lang="en"&gt;&lt;div id="as0005"&gt;&lt;p id="sp00050"&gt;Diffuse emission of magmatic CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;is one of the main indicators of volcanic unrest at Mammoth Mountain, but the presence of deep seasonal&amp;nbsp;snowpack&amp;nbsp;at the site has hindered year-round CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;flux observations. A permanent&amp;nbsp;eddy covariance&amp;nbsp;station was established at the largest area of diffuse CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;degassing on Mammoth Mountain (Horseshoe Lake tree kill) that measured CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;fluxes (&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;&lt;i&gt;c&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;) and&amp;nbsp;meteorological parameters&amp;nbsp;on a half-hourly basis. From July 22, 2014 to May 24, 2020,&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;&lt;i&gt;c&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;ranged from −35 to 10,546 g m&lt;sup&gt;−2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;d&lt;sup&gt;−1&lt;/sup&gt;.&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;&lt;i&gt;c&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;decreased on average by 53% over the study period, tracking the long-term decline in CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;emissions following the last major increase that occurred at the Horseshoe Lake tree kill area from 2009 to 2011. Statistical and spectral analyses were applied to the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;&lt;i&gt;c&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and ancillary meteorological parameter time series to understand (1) relationships between these parameters, (2) their dominant periodicities, and (3) changes in&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;&lt;i&gt;c&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;that may be unexplained by meteorological forcing. Variations in detrended&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;&lt;i&gt;c&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;&lt;i&gt;cdt&lt;/i&gt;&lt;/sub&gt;) were most strongly correlated with wind direction and atmospheric temperature, followed by atmospheric pressure on diurnal to annual time scales, but wind direction likely exerted the most direct control on&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;&lt;i&gt;cdt&lt;/i&gt;&lt;/sub&gt;. Comparison of the smoothed (180-d span)&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;&lt;i&gt;cdt&lt;/i&gt;&lt;/sub&gt;&lt;span&gt;&amp;nbsp;time series to the time series of average-daily&amp;nbsp;snow water equivalent&amp;nbsp;measured ~1 km away suggested that snowpack may have suppressed CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;emissions. No evidence of a change in CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;emissions related to the last major seismic swarm beneath Mammoth Mountain on February 2–18, 2014 was observed.&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;&lt;/div&gt;&lt;ul id="issue-navigation" class="issue-navigation u-margin-s-bottom u-bg-grey1"&gt;&lt;/ul&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/j.jvolgeores.2021.107347</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Long-term year-round observations of magmatic CO2 emissions on Mammoth Mountain, California, USA</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>