Eddy covariance measurements of methane flux from freshwater wetlands, 2006-2018, Global

Delwiche, Kyle B.; Knox, S. H., Malhotra, A., Fluet-Chouinard, E., McNicol, G., Feron, S., Ouyang, Z., Papale, D., Trotta, C., Canfora, E., Cheah, Y.-W., Christianson, D., Alberto, Ma. C. R., Alekseychik, P., Aurela, M., Baldocchi, D., Bansal, S., Billesbach, D. P., Bohrer, G., Bracho, R., Buchmann, N., Campbell, D. I., Celis, G., Chen, J., Chen, W., Chu, H., Dalmagro, H. J., Dengel, S., Desai, A. R., Detto, M., Dolman, H., Eichelmann, E., Euskirchen, E., Famulari, D., Fuchs, K., Goeckede, M., Gogo, S., Gondwe, M. J., Goodrich, J. P., Gottschalk, P., Graham, S. L., Heimann, M., Helbig, M., Helfter, C., Hemes, K. S., Hirano, T., Hollinger, D., Hörtnagl, L., Iwata, H., Jacotot, A., Jurasinski, G., Kang, M., Kasak, K., King, J., Klatt, J., Koebsch, F., Krauss, K. W., Lai, D. Y. F., Lohila, A., Mammarella, I., Belelli Marchesini, L., Manca, G., Matthes, J. H., Maximov, T., Merbold, L., Mitra, B., Morin, T. H., Nemitz, E., Nilsson, M. B., Niu, S., Oechel, W. C., Oikawa, P. Y., Ono, K., Peichl, M., Peltola, O., Reba, M. L., Richardson, A. D., Riley, W., Runkle, B. R. K., Ryu, Y., Sachs, T., Sakabe, A., Sanchez, C. R., Schuur, E. A., Schäfer, K. V. R., Sonnentag, O., Sparks, J. P., Stuart-Haëntjens, E., Sturtevant, C., Sullivan, R. C., Szutu, D. J., Thom, J. E., Torn, M. S., Tuittila, E.-S., Turner, J., Ueyama, M., Valach, A. C., Vargas, R., Varlagin, A., Vazquez-Lule, A., Verfaillie, J. G., Vesala, T., Vourlitis, G. L., Ward, E. J., Wille, C., Wohlfahrt, G., Wong, G. X., Zhang, Z., Zona, D., Windham-Myers, L., Poulter, B., and Jackson, R. B.

FLUXNET-CH4 is an initiative led by the Global Carbon Project, in close partnership with AmeriFlux and EuroFlux, to compile a global database of eddy covariance (EC) methane flux measurements. Data are standardized, post-processed (i.e., partitioned and gap-filled), and released as FLUXNET-CH4. FLUXNET-CH4 Version 1.0 includes data from 81 sites, representing freshwater, coastal, upland, natural, and managed ecosystems. The near continuous, high-frequency nature of EC measurements offers significant promise for improving our understanding of ecosystem-scale CH4 flux dynamics.

The FLUXNET-CH4 Community Product is distributed in files separated by sites and by temporal aggregation resolutions (e.g., half-hourly or daily). Version information is also assigned to the file to document changes required for a site. The file naming convention below details these options for each file. Multiple files with different temporal aggregation resolution (same site, same data product) are available for download as a single ZIP file archive. Site information metadata are also provided with a data download. Data variable descriptions can be found here.

The FLUXNET-CH4 Community Product is distributed under the two tiers of the FLUXNET2015 Data Policy. Tower teams chose data policy tiers for their site. Data distributed in both tiers can be accessed from the Data Download page for the FLUXNET-CH4 Dataset. To see a list of site-years of data available for each site, please refer to the list of sites and data availability.

IMPORTANT: In case of a synthesis using both CC-By-4.0 (Tier One) and Tier Two data, all data should be treated as Tier Two. See the FLUXNET 2015 Data Policy for an explanation of data tiers.

Contact

FLUXNET

Metadata Access

DCAT in RDF/XML-Format

DCAT in Turtle-Format

DCAT in JSON-LD-Format

APGC Dataset Metadata in JSON-Format

Data and Resources

Additional Info

Field Value
Identifier DOI specific to site | See metadata file for DOI list
Project(s)
Institute Stanford University, Stanford, California, USA
Source https://fluxnet.org/data/fluxnet-ch4-community-product/
Publication Date Variable, specific to site
Version 1.0
Product Eddy covariance flux data
Sensor Eddy covariance, sensors specific to site
Files
  1. Metadata CSV file
  2. Site-specific methane fluxes zipped CSV files
Variables [Units]
  1. DOI: Site-specific digital object identifier
  2. SITE_ID: Site identification code as assigned by regional flux data network
  3. SITE_NAME: Site name determined by site personnel
  4. SITE_PERSONNEL: Person(s) primarily responsible for data collection of FLUXNET-CH4 V1.0 data
  5. COUNTRY: Site country
  6. LAT: Latitude
  7. LON: Longitude
  8. SITE_CLASSIFICATION: Site classifications were designated based on literature description of sites and designations were made from the following categories (See Delwiche et al. 2021 for details)
  9. UPLAND_CLASS: For upland sites, category of upland type was assigned based on site literature
  10. IGBP: International Geosphere–Biosphere Programme (IGBP) ecosystem surface classification
  11. KOPPEN: Koppen climate zone abbreviation
  12. ORIGINAL_DATA_SOURCE: Regional network hosting the site methane data that was incorporated into FLUXNET-CH4
  13. FLUXNET-CH4_DATA_POLICY: Data policy for site data (CC BY 4.0 or Tier 2)
  14. YEAR_START: Year data begins
  15. YEAR_END: Year data ends
  16. SOIL_TEMP_PROBE_DEPTHS: Installed depth of soil temperature probe [cm]
  17. MOSS_BROWN: presence or absence of brown mosses on the site [1:Present; 0: Absent]
  18. MOSS_SPHAGNUM: presence or absence of Sphagnum mosses on the site [1:Present; 0: Absent]
  19. AERENCHYMATOUS: presence or absence of species that have aerenchyma [1:Present; 0: Absent]
  20. ERI_SHRUB: presence or absence of ericaceous shrubs on the site [1:Present; 0: Absent]
  21. TREE: presence or absence of trees (of any height) on the site [1:Present; 0: Absent]
  22. DOM_VEG: Dominant plant functional type in the tower footprint.
Region Global
Spatial Reference EPSG:4326 WGS 84
Spatial Resolution
Spatial Coverage Latitude -90.00 to 90.00, Longitude -180.00 to 180.00
Temporal Coverage 2002-2015
Temporal Resolution Half-hourly, Daily
Format CSV
Is Supplement To

Delwiche, K. B. et al. FLUXNET-CH4: a global, multi-ecosystem dataset and analysis of methane seasonality from freshwater wetlands , Earth Syst. Sci. Data, 13, 3607–3689, https://doi.org/10.5194/essd-13-3607-2021, 2021.
Related to

Knox, Sara H., Robert B. Jackson, Benjamin Poulter, Gavin McNicol, Etienne Fluet-Chouinard, Zhen Zhang, Gustaf Hugelius, et al. 2019. “FLUXNET-CH4 Synthesis Activity: Objectives, Observations, and Future Directions.” Bulletin of the American Meteorological Society 100 (12): 2607–3

Dataset extent