Vegetation Warming Experiment: Plant Physiology, Utqiagvik (Barrow), Alaska, 2019

DOI: https://doi.org/10.5440/2323544
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NGEE Arctic Record ID: NGA200
Data Version: 1.0
Abstract

Leaf gas exchange measurements on Eriophorum angustifolium Honck. following a single season warming treatment. Data were collected in 2019 from 5 treatment warming chambers and paired control plots located on the Barrow Environmental Observatory (BEO), Utqiagvik, Alaska. Data include CO2 response (ACi) curves, light response (AQ) curves, and dark-adapted respiration (Rdark) logged data measured at controlled leaf temperatures from 5–25 °C. The data package includes 4 data files in .csv format, 10 metadata files, and the complete instrument output for all measurements (.xlsx, .xls and text files in zip files by data type). These data were collected as part of an experiment using Zero Power Warming (ZPW) chambers that delivered a single season warming treatment of ~4 °C above ambient air temperature. Four different plant species were targeted over four experimental years from 2017–2021. See related data packages for processed gas exchange data, leaf trait data (leaf mass per area, leaf nitrogen concentration), ambient and chamber environmental conditions, phenocamera images, thaw depth and GPS locations of chambers.

The Next-Generation Ecosystem Experiments: Arctic (NGEE Arctic), was a 15-year research effort (2012-2027) 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
Kim Ely (kely@bnl.gov) 0000-0002-3915-001X
Kenneth Davidson (kdavidson@bnl.gov) 0000-0001-5745-9689
Alistair Rogers (arogers@bnl.gov) 0000-0001-9262-7430
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Dataset Citation
Kim Ely, Kenneth Davidson, Alistair Rogers. 2024. Vegetation Warming Experiment: Plant Physiology, Utqiagvik (Barrow), Alaska, 2019. 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/10.5440/2323544.
Dates
2019-07-14 - 2019-07-30
Geographic Location
NGEE Arctic Utqiagvik (Barrow), Alaska
North71.35
South71.2
East-156.4
West-156.7
Place Keywords:
Utqiagvik, Alaska; North Slope, Alaska; Barrow Environmental Observatory; BEO
Subject Keywords:
ESS-DIVE Leaf-Level Gas Exchange Reporting Format | ESS-DIVE File Level Metadata Reporting Format | ESS-DIVE CSV File Formatting Guidelines Reporting Format |
GCMD Keywords
EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PHOTOSYNTHESIS
EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > RESPIRATION RATE
Methodology
Warming chambers and paired ambient plots were located within a 1 km2 area centered around 71.275°N, -156.641°W. For precise locations of chambers and ambient plots refer to dGPS location files included with the related thaw depth & GPS dataset. Warming chambers were deployed on the plots on 19 June, 2019, and gas exchange measurements were made during 13–30 July, 2019. Measurements were made in situ on 259 fully expanded, attached leaves of Eriophorum angustifolium Honck. using 5 recently calibrated LI-COR 6400XT gas exchange systems. For all measurement types, the selected leaf was clamped into the sample chamber, leak tested by blowing at the chamber gaskets through a tube while monitoring for change in CO2S, and allowed to acclimate to reach steady state photosynthesis and conductance for a minimum of 20 minutes. Leaf temperature was measured using the instrument thermocouple, light level in the chamber set to 1800 micromol m-2 s-1, CO2R set to 400 micromol mol-1 and flow was typically set to 350 micromol s-1. CO2 response curves (ACi curves) were measured at set leaf temperatures of 5, 10, 15, 20 or 25 °C under saturating light of 1800 micromol m-2 s-1. Following stabilization to chamber conditions, CO2R was decreased by a number of set points from 400 micromol mol-1, followed by incremental increase to 1800 micromol mol-1, typically following the sequence 400, 300, 225, 150, 100, 75, 50, 400, 400, 400, 475, 575, 675, 800, 1000, 1400 and 1800 micromol mol-1. Following the adjustment to each new CO2 level, data were logged as soon as CO2 and photosynthetic rate were stable after a minimum wait time of 60 s. CO2 response curves were followed by dark-adapted dark respiration measurements on the same leaf, at the same set leaf temperature, after a dark adaptation time of at least 20 minutes. Dark conditions were achieved by turning the lamp off and covering the sensor head and adjacent vegetation with a light-proof black cloth. Once stability was reached, the analyzers were matched and data logged at 5 second intervals for 5 minutes. For some samples ACi curves and/or respiration measurements were made at multiple leaf temperature set points. In these cases the leaf was allowed to reach stability at least 20 minutes following each temperature change, and all ACi curves in the sequence were completed prior to progressing to the dark-adapted dark respiration measurements. Light response measurements (AQ curves) were measured on a different set of sample leaves. Prior to light response curve measurements, sample leaves were allowed to achieve steady state CO2 and water vapor exchange under conditions of constant temperature of 15 °C and CO2S concentration of 390 ppm. Each light response curve consisted of a sequence of decreasing levels of irradiance (typically 2000, 1750, 1500, 1250, 1000, 750, 500, 375, 200, 100, 85, 70, 55, 40 and 0 micromol m-2 s-1). Following an adjustment to each new irradiance, data were logged when irradiance, leaf temperature, and photosynthetic rate were stable, after a minimum wait time of 30 s. Following completion of the curve, each leaf sample was removed from the chamber, the leaf area was measured using a metal ruler and hand lens, and gas exchange results recalculated to adjust for leaf area. The files included in this data package follow the ESS-DIVE Leaf-level gas exchange data and metadata reporting format (Ely et al, 2021). Further method details are described in Rogers et al. (2017, 2019). Methods references Rogers et al (2017). Terrestrial biosphere models underestimate photosynthetic capacity and CO2 assimilation in the Arctic. New Phytologist 216: 1090–1103 doi: 10.1111/nph.14740 Rogers et al (2019). Terrestrial biosphere models may overestimate Arctic CO2 assimilation if they do not account for decreased quantum yield and convexity at low temperature. New Phytologist 223: 167–179 doi: 10.1111/nph.15750 Ely et al (2021). A reporting format for leaf-level gas exchange data and metadata. Ecological Informatics 61: 101232. doi: 10.1016/j.ecoinf.2021.101232
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: Kim Ely
Organization: Brookhaven National Laboratory
Email: kely@bnl.gov
Point of Contact
Contact information for the individual or organization that is knowledgeable about the data.
Person: Alistair Rogers
Organization: Brookhaven National Laboratory
Email: arogers@bnl.gov
Dataset Usage Rights
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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