Seasonal and Diurnal Variations in Atmospheric and Soil Air 14CO2 in a Boreal Scots Pine Forest

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http://hdl.handle.net/10138/322842

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Palonen , V , Pumpanen , J , Kulmala , L-M , Levin , I , Heinonsalo , J & Vesala , T 2018 , ' Seasonal and Diurnal Variations in Atmospheric and Soil Air 14CO2 in a Boreal Scots Pine Forest ' , Radiocarbon , vol. 60 , no. 1 , pp. 283-297 . https://doi.org/10.1017/RDC.2017.95

Title: Seasonal and Diurnal Variations in Atmospheric and Soil Air 14CO2 in a Boreal Scots Pine Forest
Author: Palonen, Vesa; Pumpanen, Jukka; Kulmala, Liisa-Maija; Levin, Ingeborg; Heinonsalo, Jussi; Vesala, Timo
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Viikki Plant Science Centre (ViPS)
University of Helsinki, Viikki Plant Science Centre (ViPS)
Date: 2018-02
Language: eng
Number of pages: 15
Belongs to series: Radiocarbon
ISSN: 0033-8222
URI: http://hdl.handle.net/10138/322842
Abstract: We present a radiocarbon (C-14) dataset of tropospheric air CO2 forest soil air CO2, and soil CO2 emissions over the course of one growing season in a Scots pine forest in southern Finland. The CO2 collection for C-14 accelerator mass spectrometry (AMS) analysis was done with a portable, suitcase-sized system, using molecular sieve cartridges to selectively trap CO2 The piloting measurements aimed to quantify the spatial, seasonal and diurnal changes in the C-14 content of CO2 in a northern forest site. The atmospheric samples collected above the canopy showed a large seasonal variation and an 11 parts per thousand difference between day and nighttime profiles in August. The higher Delta C-14 values during night are partly explained by a higher contribution of C-14-elevated soil CO2, accumulating in the nocturnal boundary layer when vertical mixing is weak. We observed significant seasonal trends in Delta C-14-CO2 at different soil depths that reflected changes in the shares of autotrophic and heterotrophic respiration. Also the observed diurnal variation in the Delta C-14 values in soil CO2 highlighted the changes in the origin of CO2, with root activity decreasing more for the night than decomposition.
Subject: 1172 Environmental sciences
atmosphere
carbon dioxide
radiocarbon
soil
CARBON BALANCE
CO2 EFFLUX
C-14 DATA
RESPIRATION
DYNAMICS
ROOT
RADIOCARBON
ALLOCATION
EXCHANGE
DIOXIDE
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