Selected breakpoints of net forest carbon uptake at four eddy-covariance sites

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http://hdl.handle.net/10138/330559

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Foken , T , Babel , W , Munger , J W , Gronholm , T , Vesala , T & Knohl , A 2021 , ' Selected breakpoints of net forest carbon uptake at four eddy-covariance sites ' , Tellus. Series B: Chemical and Physical Meteorology , vol. 73 , no. 1 , 1915648 . https://doi.org/10.1080/16000889.2021.1915648

Title: Selected breakpoints of net forest carbon uptake at four eddy-covariance sites
Author: Foken, Thomas; Babel, Wolfgang; Munger, J. William; Gronholm, Tiia; Vesala, Timo; Knohl, Alexander
Contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2021-05-04
Language: eng
Number of pages: 12
Belongs to series: Tellus. Series B: Chemical and Physical Meteorology
ISSN: 1600-0889
URI: http://hdl.handle.net/10138/330559
Abstract: Extensive studies are available that analyse time series of carbon dioxide and water flux measurements of FLUXNET sites over many years and link these results to climate change such as changes in atmospheric carbon dioxide concentration, air temperature and growing season length and other factors. Many of the sites show trends to a larger carbon uptake. Here we analyse time series of net ecosystem exchange, gross primary production, respiration, and evapotranspiration of four forest sites with particularly long measurement periods of about 20 years. The regular trends shown are interrupted by periods with higher or lower increases of carbon uptake. These breakpoints can be of very different origin and include forest decline, increased vegetation period, drought effects, heat waves, and changes in site heterogeneity. The influence of such breakpoints should be included in long-term studies of land-atmosphere exchange processes.
Subject: carbon uptake
breakpoints
eddy-covariance
forest
climate change
CARBOEUROPE FLUX DATA
COHERENT STRUCTURES
INTERANNUAL VARIABILITY
QUALITY-CONTROL
ANNUAL SUMS
WATER-USE
DIOXIDE
CO2
EXCHANGE
HEAT
1171 Geosciences
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