Radiocarbon in Ecosystem Respiration and Soil Pore-Space CO2 with Surface Gas Flux, Air Temperature, and Soil Temperature and Moisture, Utqiagvik (Barrow), Alaska, 2012-2014

DOI: https://doi.org/10.5440/1364062
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NGEE Arctic Record ID: NGA148
Data Version: 1.0
Abstract

Dataset includes Delta14C measurements made from CO2 that was collected and purified in 2012-2014 from surface soil chambers, soil pore space, and background atmosphere. In addition to 14CO2 data, dataset includes co-located measurements of CO2 and CH4 flux, soil and air temperature, and soil moisture. Measurements and field samples were taken from intensive study site 1 areas A, B, and C, and the site 0 and AB transects, from specified positions in high-centered, flat-centered, and low centered polygons. The column "sample_size" was added to "radiocarbon_field_Barrow_2012_2013_2014.csv" September 2018 with no changes to other data. This dataset contains one pdf and four csv files. 

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) and the North Slope near Utqiagvik (Barrow), Alaska and 2) multiple areas on 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
Lydia Vaughn (lydiajsmith@lbl.gov) 0000-0001-9337-464X
Margaret Torn (mstorn@lbl.gov) 0000-0002-8174-0099
Rachel Porras (rcporras@lbl.gov) 0000-0003-0251-100X
Bryan Curtis (Curtis@colorado.edu)
Oriana Chafe (oechafe@lbl.gov) 0000-0002-8407-284X
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Dataset Citation
Lydia Vaughn, Margaret Torn, Rachel Porras, Bryan Curtis, Oriana Chafe. 2018. Radiocarbon in Ecosystem Respiration and Soil Pore-Space CO2 with Surface Gas Flux, Air Temperature, and Soil Temperature and Moisture, Utqiagvik (Barrow), Alaska, 2012-2014. 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/10.5440/1364062.
Dates
2012-08-08 - 2014-09-08
Geographic Location
NGEE Arctic Utqiagvik (Barrow), Alaska
North71.35
South71.2
East-156.4
West-156.7
Place Keywords:
Barrow, Alaska | Intensive Site 0 | Area A | Area C | Intensive Site 1 | Barrow Environmental Observatory | Utqiagvik, Alaska | Area B | AB Transects
Subject Keywords:
GEOCHEMISTRY | Delta14CO2 | Soil moisture | volumetric water content | soil temperature | thaw depth |
GCMD Keywords
N/A
Methodology
CO2 for Delta14C measurements was purified from gas samples collected in the field from either surface soil chambers or soil pore space. Soil chambers were scrubbed of CO2 using a soda lime trap, then allowed to accumulate soil-emitted CO2. Gas within the chamber was then collected in evacuated stainless steel sampling canisters or glass vials. Soil pore space samples were collected through 1/4" stainless steel tubes, directly into evacuated stainless steel sampling canisters or glass vials. For all 14CO2 measurements, CO2 was cryogenically purified and reduced to graphite prior to 14C analysis with accelerator mass spectrometry (AMS). 13C analyses for use in 14C calculations were performed at the UC Davis Stable Isotope Laboratory. Fluxes of CO2 and CH4 were measured using opaque or transparent static chambers (25 cm diameter, 15-20 cm height). Chambers were tall enough to enclose vegetation and were vented according to Xu et al., (2006) to minimize pressure excursions due to the Venturi effect. In inundated plots, a floating chamber was used whose base extended 4 cm below the water surface. In all other plots, chambers were seated on PVC bases extending ~15 cm below the soil surface. To minimize disturbance, bases were installed at the beginning of the sampling season and left in place throughout the remainder of the season. For each flux measurement, the chamber was seated in a 3 cm-deep, water-filled channel in the base's top rim to create an airtight seal. A Los Gatos Research, Inc. (LGR) portable Greenhouse Gas Analyzer was used to record CO2 and CH4 concentrations within the chamber over 4-8 minutes, and the flux rate of each gas was calculated from the slope of the linear portion of the concentration vs. time curve. Soil temperature was measured with a thermistor or thermocouple probe, as indicated. Volumetric water content was measured with a MiniTrase TDR (Soilmoisture Equipment Corp). As vegetation and inundation status varied between plots, depths of moisture and temperature measurements were determined from the top of the moss layer, bare soil, or water surface.
Related References
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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: Lydia Vaughn
Organization: Lawrence Berkeley National Laboratory
Email: lydiajsmith@lbl.gov
Point of Contact
Contact information for the individual or organization that is knowledgeable about the data.
Person: Lydia Vaughn
Organization: Lawrence Berkeley National Laboratory
Email: lydiajsmith@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