Data Set Citation:
When using this data, please cite the data package:
NCEAS 2267: Ojima: Analysis and Synthesis of Trace Gas Fluxes , National Center for Ecological Analysis and Synthesis , and Ojima D.
Trace gas flux database
nceas.148.7 (https://knb.ecoinformatics.org:443/knb/metacat/nceas.148.7/nceas)
General Information:
Title:Trace gas flux database
Identifier:nceas.148.7
Alternate Identifier:TRAGNET Database
Abstract:
The atmospheric concentrations of greenhouse gases such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) are increasing substantially. These increases are expected to result in global warming and changes in precipitation patterns, and may directly affect terrestrial ecosystems. Our understanding of the contemporary fluxes of these gases between the land and atmosphere is incomplete. There are large regions of the earth for which we have very little information on trace gas fluxes. Furthermore, for no region do we fully understand how global change, including land-use change, will affect gas fluxes.The United States Trace Gas Network(TRAGNET) is meant to accomplish the following two goals: Document contemporary fluxes of CO2, CH4 and N2O between regionally important ecosystems and the atmosphere Determine the factors controlling these fluxes and improve our ability to predict future fluxes in response to ecosystem and climate change.Part of this research is supported by the National Science Foundation. Abstract from website http://www.nrel.colostate.edu/projects/tragnet/.
Keywords:none:
  • trace gases (theme)
none:
  • carbon dioxide (theme)
none:
  • methane (theme)
none:
  • nitrous oxide (theme)
none:
  • greenhouse gases (theme)
none:
  • climate change (theme)
none:
  • agricultural lands (place)
none:
  • croplands (place)
none:
  • biogeochemistry (theme)
none:
  • flux (theme)
none:
  • forests (place)
none:
  • gas exchange collections (theme)
none:
  • grasslands (place)
none:
  • landfills (place)
none:
  • pastures (place)
none:
  • net primary productivity NPP (theme)

Involved Parties

Data Set Creators:
Organization:NCEAS 2267: Ojima: Analysis and Synthesis of Trace Gas Fluxes
Organization:National Center for Ecological Analysis and Synthesis
Individual: Dennis Ojima
Address:
Natural Resource Ecology Laboratory, Colorado State University,
Fort Collins, Colorado 80523 USA
Phone:
(303)491-1976 (voice)
Phone:
(303)491-5632 (Fax)
Email Address:
dennis@nrel.colostate.edu
Data Set Contacts:
Individual: Dennis Ojima
Address:
Natural Resource Ecology Laboratory, Colorado State University,
Fort Collins, Colorado 80523 USA
Phone:
(303)491-1976 (voice)
Phone:
(303)491-5632 (Fax)
Email Address:
dennis@nrel.colostate.edu
Associated Parties:
Individual: Arvin Mosier
Metadata Providers:
Individual: Andrea Chadden

Data Set Characteristics

Geographic Region:
Geographic Description:Sites throughout the United States (including Alaska), and Puerto Rico.
Bounding Coordinates:
West:  -180  degrees
East:  61.48  degrees
North:  76.63  degrees
South:  -13.7  degrees
Time Period:
Date:
1993-01-01

Sampling, Processing and Quality Control Methods

Step by Step Procedures
Step 1:  
Description:

Instrument Description

Permanent plots for gas flux measurement were established by driving 20.3 cm inside diameter PVC pipe, 8-cm into the soil. We measured CH4, N2O and CO2 flux by placing closed, vented chambers over the established anchors and taking gas samples from inside the chambers at prescribed intervals, totaling one hour or less, with polypropylene syringes fitted with nylon stopcocks. The 7.5 cm high chambers were constructed from PVC pipe and sheeting and the tops were covered with reflective tape. The vented chambers were preparred according to Hutchinson and Mosier (1981, Soil Sci. Soc. Am. J. 45:311-316). Gas samples were analyzed for CH4, N2O and CO2 by gas chromatography. Refer methodology questions to A.R. Mosier (amosier@lamar.colostate.edu). Photo of instrument at http://nrel.colostate.edu/projects/tragnet/instruments.html.

Data Set Usage Rights

no restrictions
Access Control:
Auth System:knb
Order:denyFirst
Metadata download: Ecological Metadata Language (EML) File