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Conifer Needle Chlorophyll Fluorescence, Niwot Ridge, Colorado, USA, 2017-2018

Metadata Updated: December 6, 2023

This dataset provides chlorophyll fluorescence measurements made on pine and spruce needle tissues at the Niwot Ridge AmeriFlux Core site (US-NR1) near Nederland, Colorado, USA, during the summers of 2017 and 2018. Two types of measurements were made using pulse-amplitude-modulation (PAM) fluorometry: the photosystem II (PSII) operating efficiency in the light (Fq'/Fm' at variable light levels), and the maximum quantum efficiency of PSII photochemistry (Fv/Fm) on dark-acclimated tissues. Chlorophyll fluorescence measurements were made to determine seasonality of photosynthetic performance at the needle level.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources

Dates

Metadata Created Date December 1, 2022
Metadata Updated Date December 6, 2023

Metadata Source

Harvested from NASA Data.json

Graphic Preview

Chlorophyll a+b concentration relative to dry mass (green), maximum quantum efficiency (Fv/Fm) measured with a fluorimeter (blue), and dark-adapted xanthophyll cycle conversion state (purple) ([Zeaxanthin+Antheraxanthin]/[Violaxanthin+Antheraxanthin+Zeaxanthin]) sampled at monthly intervals. All needle leaf measurements represent the mean and 1 SE of both Engelmann spruce and lodgepole pine samples during each 2 - 3 day sampling period. Refer to the related datasets for pigment concentrations. Figure from Magney et al. (2019).

Additional Metadata

Resource Type Dataset
Metadata Created Date December 1, 2022
Metadata Updated Date December 6, 2023
Publisher ORNL_DAAC
Maintainer
Identifier C2389021650-ORNL_CLOUD
Data First Published 2019-11-22
Language en-US
Data Last Modified 2023-06-12
Category CMS, geospatial
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Citation Bowling, D.R., and B.A. Logan. 2019. Conifer Needle Chlorophyll Fluorescence, Niwot Ridge, Colorado, USA, 2017-2018. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1722
Graphic Preview Description Chlorophyll a+b concentration relative to dry mass (green), maximum quantum efficiency (Fv/Fm) measured with a fluorimeter (blue), and dark-adapted xanthophyll cycle conversion state (purple) (Zeaxanthin+Antheraxanthin/Violaxanthin+Antheraxanthin+Zeaxanthin) sampled at monthly intervals. All needle leaf measurements represent the mean and 1 SE of both Engelmann spruce and lodgepole pine samples during each 2 - 3 day sampling period. Refer to the related datasets for pigment concentrations. Figure from Magney et al. (2019).
Graphic Preview File https://daac.ornl.gov/CMS/guides/Niwot_Ridge_CNPAM_Fluorescence_fig1.jpg
Harvest Object Id 4a56850b-ea87-435d-8e8a-f280534cb4ac
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL https://doi.org/10.3334/ORNLDAAC/1722
Metadata Type geospatial
Old Spatial 40.03 -105.55
Program Code 026:001
Source Datajson Identifier True
Source Hash 2340dba10aac5c346782e423ce5164abb02a5581b338346ee930cd2f8bec69df
Source Schema Version 1.1
Spatial
Temporal 2017-07-10T00:00:00Z/2018-06-11T23:59:59Z

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