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

Published by ORNL_DAAC | National Aeronautics and Space Administration | Metadata Last Checked: November 03, 2025 | Last Modified: 2025-09-11

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.

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earth-science-ecological-dynamics-biosphere-ecosystem-functions-photosynthesis earth-science-ecosystems-biosphere-terrestrial-ecosystems-forests earth-science-vegetation-biosphere-chlorophyll earth-science-vegetation-biosphere-leaf-characteristics

Complete Metadata

bureauCode	[ "026:00" ]
identifier	10.3334/ORNLDAAC/1722
landingPage	https://search.earthdata.nasa.gov/search?q=Niwot_Ridge_CNPAM_Fluorescence_1722&ac=true
programCode	[ "026:000" ]
spatial	[[{"WestBoundingCoordinate":-105.55,"NorthBoundingCoordinate":40.03,"EastBoundingCoordinate":-105.55,"SouthBoundingCoordinate":40.03}],"CARTESIAN"]
temporal	2017-07-10/2017-07-10
theme	[ "Earth Science" ]