NGEE Arctic CO2, CH4 and Energy Eddy-Covariance (EC) Flux Tower Auxiliary Measurements, Council Road Mile Marker 71, Seward Peninsula, Alaska, 2017 - Ongoing

DOI: https://doi.org/10.5440/1526749
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NGEE Arctic Record ID: NGA190
Data Version: 1.0
Abstract

Measurements began in July 2017 and are made year-round (2017 seasonal only) on the tussock tundra with discontinuous permafrost at the Council Road Site on the Seward Peninsula. CO2, CH4 and energy fluxes using the Eddy Covariance (EC) technique (Baldocchi 2003) and meteorological measurements are reported as 30-minute averages. The tower site is registered with AmeriFlux as US-NGC. See http://ameriflux.lbl.gov/sites/siteinfo/US-NGC for more information.

Reported data include: (1) additional/extra meteorological and eddy covariance CO2, CH4 and energy flux data, (2) binned spectra for the three wind components, the sonic temperature and gas densities together with the binned cospectra for covariances of w (vertical wind component) and gas densities, (3) binned ogives (cumulative (co)spectra) for the three wind components, the sonic temperature and gas densities, and (4) tower site footprint matrices. Meteorological and eddy covariance CO2, CH4 and energy flux data (AmeriFlux BASE data product) are available from AmeriFlux https://doi.org/10.17190/AMF/1634883. 

The Next-Generation Ecosystem Experiments: Arctic (NGEE Arctic), was a research effort to reduce uncertainty in Earth System Models by developing a predictive understanding of carbon-rich Arctic ecosystems and feedbacks to climate. NGEE Arctic was supported by the Department of Energy’s Office of Biological and Environmental Research.

The NGEE Arctic project had two field research sites: 1) located within the Arctic polygonal tundra coastal region on the Barrow Environmental Observatory (BEO) near Utqiagvik (Barrow), Alaska and 2) multiple areas in the discontinuous permafrost region of the Seward Peninsula north of Nome, Alaska.

Through observations, experiments, and synthesis with existing datasets, NGEE Arctic provided an enhanced knowledge base for multi-scale modeling and contributed to improved process representation at global pan-Arctic scales within the Department of Energy’s Earth system Model (the Energy Exascale Earth System Model, or E3SM), and specifically within the E3SM Land Model component (ELM).

Authors
Sigrid Dengel (sdengel@lbl.gov)
Margaret Torn (mstorn@lbl.gov)
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Dataset Citation
Sigrid Dengel, Margaret Torn. 2020. NGEE Arctic CO2, CH4 and Energy Eddy-Covariance (EC) Flux Tower Auxiliary Measurements, Council Road Mile Marker 71, Seward Peninsula, Alaska, 2017 - Ongoing. Next Generation Ecosystem Experiments Arctic Data Collection, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tennessee, USA. Dataset accessed on [INSERT_DATE] at https://doi.org/10.5440/1526749.
Dates
2017-01-01 - current
Geographic Location
NGEE Arctic Council Site, Mile Marker 71, Alaska
North64.864161
South64.830411
East-163.654095
West-163.785777
Place Keywords:
N/A
Subject Keywords:
Flux | soil temperature | water vapor density | relative humidity | Evapotranspiration | CO2 mixing ratio | VPD | dew temperature | CH4 mixing ration | wind speed | wind direction | friction velocity | radiation | heat flux | CO2 flux | CH4 flux | NDVI | CO2 soil flux |
GCMD Keywords
EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY
EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC RADIATION
EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC WINDS
EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC TEMPERATURE
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Methodology
UT USA), stored in binary files as 4-byte (single precision) real numbers, and represent the 10 Hz outputs of the IRGASON Integrated CO2 and H2O gas analyser and sonic anemometer and the LI-COR LI-7700 CH4 open-path gas analyzer. The high frequency data are post-processed with EddyPro® (Version 6.2.1), an open-source eddy covariance software package developed by LI-COR (http://licor.com/env/products/eddy_covariance/software.html) to output 30-min final fluxes, wind velocities and concentrations. The meteorological data themselves are being sampled at a lower frequency and output as 30-min averages throughout the measurement period. During processing standard corrections, such as the frequency correction by Massman (2000) were applied together with the Webb-Pearman-Leuning correction (Webb et al. 1980), applicable to open-path gas analyzers and the spectroscopic corrections that only applies to the LI-7700 CH4 gas analyzer (McDermitt et al. 2011). Data were quality controlled by removing data outside plausible limits, rainy events (see Burba, 2013) and by following Foken et al. (2004). Data are not gap-filled. The included spectra and cospectra (Aubinet et al. 2012) for the three wind components, the sonic temperature and the three gases CO2, CH4 and H2O, together with the respective cospectra are calculated after raw data have been fully processed. In addition, ogives of all cospectra represent the integration of the cospectrum and can be used to evaluate the suitability of the chosen flux averaging period. The footprint matrices included in the current dataset were calculated following the Kormann and Meixner (2001) approach. For a detailed description of Eddy Covariance fluxes and calculations, together with a very good description of spectral corrections, spectra and cospectra and footprint analysis can be found in Aubinet et al. (2012) and Burba (2013).
Related References
Citation: Margaret Torn, Sigrid Dengel (2020), AmeriFlux BASE US-NGC NGEE Arctic Council, Ver. 1-5, AmeriFlux AMP, (Dataset). https://doi.org/10.17190/AMF/1634883
Sigrid Dengel, Oriana Chafe, Paul Cook, Margaret Torn. 2020. NGEE Arctic Soil Micro-warming Experiment Temperature Profiles, Council Road Mile Marker 71, Seward Peninsula, Alaska, 2017-2019. Next Generation Ecosystem Experiments Arctic Data Collection, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tennessee, USA. https://doi.org/10.5440/1634215.
Misha Krassovski, Jeff Riggs. 2019. NGEE Arctic Meteorological Data from Instrumented PCDC Stations, Council Site, Seward Peninsula, Alaska, Beginning June 2018. Next Generation Ecosystem Experiments Arctic Data Collection, Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tennessee, USA. https://doi.org/10.5440/1529604.
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Related Identifiers
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Metadata Contact
Contact information for the individual or organization that is knowledgeable about the data.
Person: Terri Killeffer
Organization: ORNL
Email: killefferts@ornl.gov
Point of Contact
Contact information for the individual or organization that is knowledgeable about the data.
Person: Sigrid Dengel
Organization: Lawrence Berkeley National Laboratory
Email: sdengel@lbl.gov
Dataset Usage Rights
Public Datasets

This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit https://creativecommons.org/licenses/by/4.0.

See the NGEE Arctic Data Policies for more details https://ngee-arctic.ornl.gov/data-policies.

Distribution Point of Contact
Contact: Data Center Support
Organization: Next-Generation Ecosystem Experiments (NGEE) Arctic Project, Oak Ridge National Laboratory
Email: support@ngee-arctic.ornl.gov