Methane Fluxes from Shorelines and Differing Surfaces, 2019, Big Trail Lake, Alaska (US)

Elder, Clayton D.; Hasson, Nicholas; Hanke, Philip; Wright, S.; Anthony, Katey M. Walter; Miller, Charles E.

This dataset provides methane fluxes from hot-spot and non-hot spot differing surfaces at Big Trail Lake (BTL) in the Goldstream Valley near Fairbanks, AK, USA. Measurements were taken at a remotely-sensed methane hotspot on the shoreline of a pond, adjacent to BTL with a Los Gatos Ultra-Portable Greenhouse Gas Analyzer (UGGA), and from various non-hotspot surfaces representative of the broader thermokarst lake ecosystem with bucket chambers. All data were collected between 2019-07-04 and 2019-12-04 during the daytime hours of 09:35-17:32 local time. A ground-based CH4 enhancement survey was performed on 2019-07-06 between 13:25-17:15 Alaska Daylight Time (AKDT), approximately two hours following an AVIRIS-NG overflight and hotspot detection at the Eastside Pond. Methane flux is reported in units of both mmol CH4 m-2 hr-1 and mg CH4 m-2 d-1. Flux errors are quantified for each

Methane flux at hotspots was monitored using chambers constructed from plastic five-gallon (18.9-liter) buckets with bottoms removed and resealable air-tight lids were installed at hotspot flux monitoring locations. Non-hotspot fluxes were measured using permanent aluminum chamber-collars installed to 3–5 cm depth at long-term flux monitoring locations both near the hotspot and other locations of BTL. A large transparent chamber was used at all non-hotspot locations and was designed to enclose vegetation up to ~1.5 m in height. The data represent non-ebullitive (diffusive + potential plant-mediated) flux.

There is one data file in comma-separated (*.csv) format included in this dataset.

Citation

In order to use these data, you must cite this data set with the following citation:

Elder, C., N. Hasson, P. Hanke, S. Wright, K.W. Anthony, and C.E. Miller. 2021. Methane Fluxes from Shorelines and Differing Surfaces, Big Trail Lake, Alaska, 2019. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1870

This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use Policy.

Acknowledgments

This work was funded by NASA’s Terrestrial Ecology Program via the Arctic Boreal Vulnerability Experiment (ABoVE) (grant 18-TE18- 0051).

Contact

ORNL DAAC

Metadata Access

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Identifier DOI:10.3334/ORNLDAAC/1870
Project(s) Arctic-Boreal Vulnerability Experiment (ABoVE)
Institute Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
Эх сурвалж https://doi.org/10.3334/ORNLDAAC/1870
Publication Date 2021-12-21
Хувилбар 1.0
Product methane fluxes
Sensor Los Gatos Ultra-Portable Greenhouse Gas Analyzer (UGGA)
Files
  1. CH4_Fluxes_Thermokarst_Lakes_AK.csv
Variables [Units]
  1. plot_id: Plot IDs in which measurements were made using smaller bucket chambers start with either “Hotspot_...” or “HotspotBucket_, “ or “c36.1_...” (different teams used slightly different nomenclature). Plot IDs in which measurements were made with a larger transparent chamber, are designated as “Collar”, designed to enclose vegetation up to ~1.5 m in height. Plot Ids with “rep” in the name are measurements that were immediately replicated in time from the same “transect ID” location.
  2. transect_id: Identification of measurement stations. Measurements that have the same “transect_ID” represent replicated measurements taken at different times at the same location.
  3. latitude: Latitude of measurement station [decimal degrees]
  4. longitude: Longitude of measurement station [decimal degrees]
  5. date: Date of measurement [YYYY-MM-DD]
  6. time: Time of measurement in HH:MM:SS in local time (Alaska Time) [HH:MM:SS]
  7. mmol_ch4: Methane flux reported in mmol CH4 m-2 hr-1 [mmol CH4 m-2 hr-1]
  8. flux_error: Methane flux reported in mmol CH4 m-2 hr-1 [mmol CH4 m-2 hr-1]
  9. mg_ch4: Methane flux reported in mg CH4 m-2 d-1 [mg CH4 m-2 d-1]
  10. flux_error_mg: Flux error for methane reported in mg CH4 m-2 d-1 [mg CH4 m-2 d-1]
  11. wet_dry: A qualitative assessment of soil saturation. “wet” is typically defined as fully saturated where “dry” may indicate anything less than fully saturated
  12. surface_1: Qualitative assessment of the most prominent surface type within the chamber footprint. All measurements made in the CH4-enhanced area identified by AVIRIS-NG have “surface_1” classified as “hotspot.” The general classification of “wet sediment” mostly describes water-saturated mud and lake sediments in the wet shorelines of Big Trail Lake and surrounding wetlands
  13. surface_2: Qualitative assessment of the next 2nd most prominent surface
  14. surface_3: Qualitative assessment of the 3rd most prominent surface. If a third surface type was not present (< roughly 10% of measurement footprint) “nan” was used
Region Interior Alaska
Spatial Reference
Spatial Resolution Chamber measurements have footprints <1 m2 and could be considered point data that cover a roughly 15 ha study area
Spatial Coverage Latitude 64.918594 to 64.92051, Longitude -147.82454 to -147.81868
Temporal Coverage 2019-07-04 to 2019-12-14
Temporal Resolution various time points, replicated within 2–3 weeks
Хэлбэр CSV
Is Supplement To

Elder, C.D., D.R. Thompson, A.K. Thorpe, H.A. Chandanpurkar, P.J. Hanke, N. Hasson, S.R. James, B.J. Minsley, N.J. Pastick, D. Olefeldt, K.M. Walter Anthony, and C.E. Miller. 2021. Characterizing methane emission hotspots from thawing permafrost. Global Biogeochemical Cycles, 35, e2020GB006922. https://doi.org/10.1029/2020GB006922
Related to

Elder, C., P. Hanke, K.W. Anthony, D.R. Thompson, C.E. Miller, and A.K. Thorpe. 2020. ABoVE: Methane Flux across Two Thermokarst Lake Ecosystems, Interior Alaska, 2018. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1778

Dataset extent