Strong radiative effect induced by clouds and smoke on forest net ecosystem productivity in central Siberia

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http://hdl.handle.net/10138/233936

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Park , S-B , Knohl , A , Lucas-Moffat , A M , Migliavacca , M , Gerbig , C , Vesala , T , Peltola , O , Mammarella , I , Kolle , O , Lavric , J V , Prokushkin , A & Heimann , M 2018 , ' Strong radiative effect induced by clouds and smoke on forest net ecosystem productivity in central Siberia ' , Agricultural and Forest Meteorology , vol. 250-251 , pp. 376-387 . https://doi.org/10.1016/j.agrformet.2017.09.009

Title: Strong radiative effect induced by clouds and smoke on forest net ecosystem productivity in central Siberia
Author: Park, Sung-Bin; Knohl, Alexander; Lucas-Moffat, Antje M.; Migliavacca, Mirco; Gerbig, Christoph; Vesala, Timo; Peltola, Oli; Mammarella, Ivan; Kolle, Olaf; Lavric, Jost Valentin; Prokushkin, Anatoly; Heimann, Martin
Other contributor: University of Helsinki, Viikki Plant Science Centre (ViPS)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)



Date: 2018-03-15
Language: eng
Number of pages: 12
Belongs to series: Agricultural and Forest Meteorology
ISSN: 0168-1923
DOI: https://doi.org/10.1016/j.agrformet.2017.09.009
URI: http://hdl.handle.net/10138/233936
Abstract: Aerosols produced by wildfires are a common phenomenon in boreal regions. For the Siberian taiga, it is still an open question if the effects of aerosols on atmospheric conditions increase net CO2 uptake or photosynthesis. We investigated the factors controlling forest net ecosystem productivity (NEP) and explored how clouds and smoke modulate radiation as a major factor controlling NEP during fire events in the years 2012 and 2013. To characterize the underlying mechanisms of the NEP response to environmental drivers, Artificial Neural Networks (ANNs) were trained by eddy covariance flux measurements nearby the Zotino Tall Tower Observatory (ZOTTO). Total photosynthetically active radiation, vapour pressure deficit, and diffuse fraction explain at about 54-58% of NEP variability. NEP shows a strong negative sensitivity to VPD, and a small positive to f(dlf). A strong diffuse radiation fertilization effect does not exist at ZOTTO forest due to the combined effects of low light intensity, sparse canopy and low leaf area index. Results suggests that light intensity and canopy structure are important factors of the overall diffuse radiation fertilization effect.
Subject: Eddy covariance
Net ecosystem productivity
Smoke
Photosynthetically active radiation
Artificial neural networks
Central Siberia
CARBON-DIOXIDE EXCHANGE
AEROSOL LIGHT-SCATTERING
TOWER OBSERVATORY ZOTTO
BLACK SPRUCE FOREST
DIFFUSE-RADIATION
PLANT PRODUCTIVITY
PINE FOREST
TALL TOWER
ATMOSPHERIC PARTICLES
SOLAR-RADIATION
1172 Environmental sciences
4112 Forestry
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