Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 113, Issue 46, Pages 13087-13092Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1606162113
Keywords
carotenoid pigments; evergreen conifers; gross primary productivity; chlorophyll/carotenoid index; CCl
Categories
Funding
- Alberta Informatics Circle of Research Excellence/Alberta Innovates Technology Futures [G224150012, 200700172]
- Natural Sciences and Engineering Research Council (NSERC) [RGPIN-2015-05129]
- Canada Foundation for Innovation (CFI) [26793]
- NASA Arctic-Boreal Vulnerability Experiment [NNX15AT78A]
- NASA Science of Aqua and Terra program [NNX14AJ65G]
- NSERC [RGPIN-2015-06514]
- CFI [27330]
- Ontario Ministry of Research and Innovation [ER10-07-015]
- European Research Council Synergy Grant [SyG-2013-610028]
- University of Washington [11-JV-11261952-030]
- USDA FS Eastern Forest Environmental Threat Assessment Center [03-CA-11330147-073, 04-CA-11330147-238]
- DOE-National Institute for Climate Change Research (NICCR) [08-SC-NICCR-1072]
- Department of the Interior (DOI) Southeast Climate Science Center [G10AC00624]
- DOE Terrestrial Ecosystem Science Award [11-DE-SC-0006700]
- USDA NIFA [2011-68002-30185, 2014-67003-22068]
- US Department of Energy (DOE)'s Office of Science
- US Department of Agriculture (USDA) Forest Service Northern Research Station
- NASA [NNX14AJ65G, 680145, NNX15AT78A, 797154] Funding Source: Federal RePORTER
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In evergreen conifers, where the foliage amount changes little with season, accurate detection of the underlying photosynthetic phenology from satellite remote sensing has been difficult, presenting challenges for global models of ecosystem carbon uptake. Here, we report a close correspondence between seasonally changing foliar pigment levels, expressed as chlorophyll/carotenoid ratios, and evergreen photosynthetic activity, leading to a chlorophyll/carotenoid index (CCI) that tracks evergreen photosynthesis at multiple spatial scales. When calculated from NASA's Moderate Resolution Imaging Spectroradiometer satellite sensor, the CCI closely follows the seasonal patterns of daily gross primary productivity of evergreen conifer stands measured by eddy covariance. This discovery provides a way of monitoring evergreen photosynthetic activity from optical remote sensing, and indicates an important regulatory role for carotenoid pigments in evergreen photosynthesis. Improved methods of monitoring photosynthesis from space can improve our understanding of the global carbon budget in a warming world of changing vegetation phenology.
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