<?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>Edward G. Stets</dc:contributor>
  <dc:contributor>Robert G. Striegl</dc:contributor>
  <dc:contributor>David Butman</dc:contributor>
  <dc:creator>Cory P. McDonald</dc:creator>
  <dc:date>2013</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Accurate quantification of CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;flux across the air-water interface and identification of the mechanisms driving CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;concentrations in lakes and reservoirs is critical to integrating aquatic systems into large-scale carbon budgets, and to predicting the response of these systems to changes in climate or terrestrial carbon cycling. Large-scale estimates of the role of lakes and reservoirs in the carbon cycle, however, typically must rely on aggregation of spatially and temporally inconsistent data from disparate sources. We performed a spatially comprehensive analysis of CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;concentration and air-water fluxes in lakes and reservoirs of the contiguous United States using large, consistent data sets, and modeled the relative contribution of inorganic and organic carbon loading to vertical CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;fluxes. Approximately 70% of lakes and reservoirs are supersaturated with respect to the atmosphere during the summer (June–September). Although there is considerable interregional and intraregional variability, lakes and reservoirs represent a net source of CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;to the atmosphere of approximately 40 Gg C d&lt;/span&gt;&lt;sup&gt;–1&lt;/sup&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;during the summer. While in-lake CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;concentrations correlate with indicators of in-lake net ecosystem productivity, virtually no relationship exists between dissolved organic carbon and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;i&gt;p&lt;/i&gt;&lt;span&gt;CO&lt;/span&gt;&lt;sub&gt;2,aq&lt;/sub&gt;&lt;span&gt;. Modeling suggests that hydrologic dissolved inorganic carbon supports&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;/span&gt;&lt;i&gt;p&lt;/i&gt;&lt;span&gt;CO&lt;/span&gt;&lt;sub&gt;2,aq&lt;/sub&gt;&lt;span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in most supersaturated systems (to the extent that 12% of supersaturated systems simultaneously exhibit positive net ecosystem productivity), and also supports primary production in most CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;-undersaturated systems. Dissolved inorganic carbon loading appears to be an important determinant of CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;concentrations and fluxes across the air-water interface in the majority of lakes and reservoirs in the contiguous United States.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1002/gbc.20032</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>AGU</dc:publisher>
  <dc:title>Inorganic carbon loading as a primary driver of dissolved carbon dioxide concentrations in the lakes and reservoirs of the contiguous United States</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>