10.3334/ORNLDAAC/1960
Huemmrich, K.F.
K.F.
Huemmrich
Gamon, J.A.
J.A.
Gamon
Tundra Plant Reflectance, CO2 Exchange, PAM Fluorometry, and Pigments, AK, 2001-2002
Arctic-Boreal Vulnerability Experiment (ABoVE)
ORNL Distributed Active Archive Center
2022
ATMOSPHERE, ATMOSPHERIC TEMPERATURE, SURFACE TEMPERATURE,
BIOSPHERE, VEGETATION, PIGMENTS,
BIOSPHERE, ECOSYSTEMS, TERRESTRIAL ECOSYSTEMS, ALPINE/TUNDRA
BIOSPHERE, VEGETATION, LEAF CHARACTERISTICS,
BIOSPHERE, VEGETATION, VEGETATION SPECIES,
LAND SURFACE, FROZEN GROUND, ACTIVE LAYER,
LAND SURFACE, SURFACE RADIATIVE PROPERTIES, REFLECTANCE,
LAND SURFACE, SOILS, PERMAFROST,
LAND SURFACE, SOILS, SOIL TEMPERATURE,
ATMOSPHERE, ATMOSPHERIC CHEMISTRY, CARBON AND HYDROCARBON COMPOUNDS, ATMOSPHERIC CARBON DIOXIDE
FIELD SURVEYS, INFRARED THERMOMETERS
FIELD SURVEYS, SPECTROMETERS
FIELD SURVEYS, FLUOROMETERS
photosynthesis
Utqiagvik
Barrow
Atqasuk
spectral reflectance
CO2 exchange
tundra vegetation
Alaska
ORNL DAAC
0000-00-00
0000-00-00
2001-06-08/2002-08-16
en
https://daac.ornl.gov/cgi-bin/dataset_lister.pl?p=34
Data Files
0 MB
text/csv
This dataset provides measurements at tundra plots collected near Utqiagvik and Atqasuk, AK, including visible-near infrared spectral reflectance, chamber gas exchange measurements of CO2, pulse amplitude modulated (PAM) fluorometry, chlorophyll pigment contents, along with surface temperature, permafrost active layer depth, and soil temperature at 5 cm, through the growing seasons of 2001 and 2002. At all plots, spectral reflectance was measured using a portable spectrometer configured with a straight fiber optic foreoptic, surface temperatures were measured using a handheld Everest Infrared Thermometer, and thaw depth (or active layer depth) was measured using a metal rod graduated in centimeter intervals. At small plots (~15 cm) at Utqiagvik (referred to as Patch plots) chambers were constructed that enclosed an individual patch to determine photosynthetic rate and estimate respiration rate (made by covering the chamber in a dark cloth). Efficiency using PAM fluorometer, ambient yield estimations, and rapid light curve measurements were taken. Chlorophyll concentration was measured with a portable spectrometer configured as a spectrophotometer. At larger plots (approximately 1 m2) which were part of the International Tundra EXperiment (ITEX plots) at Utqiagvik (referred to as Barrow) and Atqasuk, a sub-sample of five control and five warmed plots at each site were fitted with 0.45 m diameter polyvinyl chloride collars for chamber flux measurements. To determine the total fraction of absorbed photosynthetically active radiation (fAPAR), a series of photosynthetically active radiation (PAR) measurements were made using a custom-made light bar consisting of a linear array of GaAsP sensors mounted within an aluminum U-bar under a white plastic diffuser. In addition, a visual estimate was made of the fraction of standing dead vegetation based on percent cover. The data are provided in comma-separated values (*.csv) format. In addition, photographs of plots and instruments are provided.
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