<?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>Sheila F. Murphy</dc:contributor>
  <dc:contributor>Emily Mullins</dc:contributor>
  <dc:creator>Ariel P. Reed</dc:creator>
  <dc:date>2021</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Freshwater streams can exchange nutrients and carbon with the surrounding terrestrial environment through various mechanisms including physical erosion, flooding, leaf drop, and snowmelt. These aquatic-terrestrial interactions are crucial in carbon mobilization, transformation, ecosystem productivity, and have important implications for the role of freshwater ecosystems in the global carbon budget. We utilized high-frequency oxygen, temperature, and carbon dioxide (CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;) data to infer watershed connectivity in Boulder Creek, a mid-sized (1160&amp;nbsp;km&lt;/span&gt;&lt;sup&gt;2&lt;/sup&gt;&lt;span&gt;) watershed located in Colorado, USA. Daily modeled gross primary production (GPP), ecosystem respiration (ER), net ecosystem production (NEP), and reaeration coefficients (&lt;/span&gt;&lt;i&gt;K&lt;/i&gt;&lt;sub&gt;600&lt;/sub&gt;&lt;span&gt;) were paired with high-frequency, in-situ dissolved CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;data to characterize changes in metabolic regime and carbon flux on a stream influenced by seasonal snowmelt. GPP and ER were correlated (&lt;/span&gt;&lt;i&gt;ρ&lt;/i&gt;&lt;span&gt;&amp;nbsp;=&amp;nbsp;−0.72,&amp;nbsp;&lt;/span&gt;&lt;i&gt;p&lt;/i&gt;&lt;span&gt;&amp;nbsp;≪&amp;nbsp;0.001) during the non-snowmelt period and NEP was frequently negative. Mean&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;CO2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;during the non-snowmelt period was approximately 302 (±171) mmol C m&lt;/span&gt;&lt;sup&gt;−2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;d&lt;/span&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;&amp;nbsp;and was primarily supported by watershed CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;inputs. During snowmelt, GPP and ER were not significantly correlated (&lt;/span&gt;&lt;i&gt;ρ&lt;/i&gt;&lt;span&gt;&amp;nbsp;=&amp;nbsp;−0.22,&amp;nbsp;&lt;/span&gt;&lt;i&gt;p&lt;/i&gt;&lt;span&gt;&amp;nbsp;=&amp;nbsp;0.05), and mean NEP was significantly more negative than during non-snowmelt. Watershed connectivity was higher during snowmelt, as evidenced by significantly higher&amp;nbsp;&lt;/span&gt;&lt;i&gt;F&lt;/i&gt;&lt;sub&gt;CO2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;(843&amp;nbsp;±&amp;nbsp;338&amp;nbsp;mmol C m&lt;/span&gt;&lt;sup&gt;−2&lt;/sup&gt;&lt;span&gt;&amp;nbsp;d&lt;/span&gt;&lt;sup&gt;−1&lt;/sup&gt;&lt;span&gt;) and greater allochthonous CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;inputs than during non-snowmelt periods, emphasizing the effects of seasonal differences in aquatic-terrestrial linkages in this stream. We suggest that our understanding of watershed carbon budgets is subject to temporal dynamics which control the degree of connectivity between terrestrial and aquatic ecosystems.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1029/2021JG006296</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>American Geophysical Union</dc:publisher>
  <dc:title>Aquatic-terrestrial linkages control metabolism and carbon dynamics in a mid-sized, urban stream influenced by snowmelt</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>