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Description

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.

Product Summary

Platforms
FIELD SURVEYS
Instruments
PAM
Spatial Extent
N: 40.03 S: 40.03 E: -105.55 W: -105.55
Geographic Region
COLORADO
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2017-07-10 to 2018-06-11
Data Partner
THE OAK RIDGE NATIONAL LABORATORY (ORNL) DISTRIBUTED ACTIVE ARCHIVE CENTER (DAAC) (ORNL_DAAC)
Concept ID
c2389021650-ornl_cloud
Data State
COMPLETE
Processing Level
2
Published
Updated

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Bowling, D. R., & Logan, B. A. (2019). Conifer Needle Chlorophyll Fluorescence, Niwot Ridge, Colorado, USA, 2017-2018 (Version 1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/1722 Date Accessed: 2025-06-22

Additional 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

Documents

GENERAL DOCUMENTATION Niwot Ridge Ameriflux Tower Conifer Needle PAM Fluorescence Emission, 2017-2018: Niwot_Ridge_CNPAM_Fluorescence.pdf
USER'S GUIDE ORNL DAAC Data Set Documentation

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