<?xml version='1.0' encoding='utf-8'?>
<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:contributor>Changhui Peng</dc:contributor>
  <dc:contributor>Huai Chen</dc:contributor>
  <dc:contributor>Xiuqin Fang</dc:contributor>
  <dc:contributor>Jinxun Liu</dc:contributor>
  <dc:contributor>Hong Jiang</dc:contributor>
  <dc:contributor>Yanzheng Yang</dc:contributor>
  <dc:contributor>Gang Yang</dc:contributor>
  <dc:creator>Qiuan Zhu</dc:creator>
  <dc:date>2015</dc:date>
  <dc:description>&lt;div id="geb12307-sec-0001" class="section"&gt;
&lt;h4&gt;Aim&lt;/h4&gt;
&lt;div class="para"&gt;
&lt;p&gt;The fluctuations of atmospheric methane (&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;) that have occurred in recent decades are not fully understood, particularly with regard to the contribution from wetlands. The application of spatially explicit parameters has been suggested as an effective method for reducing uncertainties in bottom-up approaches to wetland&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;emissions, but has not been included in recent studies. Our goal was to estimate spatio-temporal patterns of global wetland&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;emissions using a process model and then to identify the contribution of wetland emissions to atmospheric&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;fluctuations.&lt;/p&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div id="geb12307-sec-0002" class="section"&gt;
&lt;h4&gt;Location&lt;/h4&gt;
&lt;div class="para"&gt;
&lt;p&gt;Global.&lt;/p&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div id="geb12307-sec-0003" class="section"&gt;
&lt;h4&gt;Methods&lt;/h4&gt;
&lt;div class="para"&gt;
&lt;p&gt;A process-based model integrated with full descriptions of methanogenesis (TRIPLEX-GHG) was used to simulate global wetland&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;emissions.&lt;/p&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div id="geb12307-sec-0004" class="section"&gt;
&lt;h4&gt;Results&lt;/h4&gt;
&lt;div class="para"&gt;
&lt;p&gt;Global annual wetland&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;emissions ranged from 209 to 245&amp;thinsp;Tg&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;year&lt;sup&gt;&amp;minus;1&lt;/sup&gt;&amp;nbsp;between 1901 and 2012, with peaks occurring in 1991 and 2012. There is a decreasing trend between 1990 and 2010 with a rate of approximately 0.48&amp;thinsp;Tg&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;year&lt;sup&gt;&amp;minus;1&lt;/sup&gt;, which was largely caused by emissions from tropical wetlands showing a decreasing trend of 0.44&amp;thinsp;Tg&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;year&lt;sup&gt;&amp;minus;1&lt;/sup&gt;&amp;nbsp;since the 1970s. Emissions from tropical, temperate and high-latitude wetlands comprised 59, 26 and 15% of global emissions, respectively.&lt;/p&gt;
&lt;/div&gt;
&lt;/div&gt;
&lt;div id="geb12307-sec-0005" class="section"&gt;
&lt;h4&gt;Main conclusion&lt;/h4&gt;
&lt;div class="para"&gt;
&lt;p&gt;Global wetland&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;emissions, the interannual variability of which was primary controlled by tropical wetlands, partially drive the atmospheric&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;burden. The stable to decreasing trend in wetland&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;emissions, a result of a balance of emissions from tropical and extratropical wetlands, was a particular factor in slowing the atmospheric&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;growth rate during the 1990s. The rapid decrease in tropical wetland&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;emissions that began in 2000 was supposed to offset the increase in anthropogenic emissions and resulted in a relatively stable level of atmospheric&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;from 2000 to 2006. Increasing wetland&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;emissions, particularly after 2010, should be an important contributor to the growth in atmospheric&amp;nbsp;&lt;span class="fixed-roman"&gt;CH&lt;sub&gt;4&lt;/sub&gt;&lt;/span&gt;&amp;nbsp;seen since 2007.&lt;/p&gt;
&lt;/div&gt;
&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1111/geb.12307</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>John Wiley &amp; Sons</dc:publisher>
  <dc:title>Estimating global natural wetland methane emissions using process modelling: spatio-temporal patterns and contributions to atmospheric methane fluctuations</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>