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

Research output: Contribution to journalArticleScientificpeer-review

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.
Original languageEnglish
JournalRadiocarbon
Volume60
Issue number1
Pages (from-to)283-297
Number of pages15
ISSN0033-8222
DOIs
Publication statusPublished - Feb 2018
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 1172 Environmental sciences
  • atmosphere
  • carbon dioxide
  • radiocarbon
  • soil
  • CARBON BALANCE
  • CO2 EFFLUX
  • C-14 DATA
  • RESPIRATION
  • DYNAMICS
  • ROOT
  • RADIOCARBON
  • ALLOCATION
  • EXCHANGE
  • DIOXIDE

Cite this

@article{b3507cadbfae4cb2b08cb4e33145f014,
title = "Seasonal and Diurnal Variations in Atmospheric and Soil Air 14CO2 in a Boreal Scots Pine Forest",
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.",
keywords = "1172 Environmental sciences, atmosphere, carbon dioxide, radiocarbon, soil, CARBON BALANCE, CO2 EFFLUX, C-14 DATA, RESPIRATION, DYNAMICS, ROOT, RADIOCARBON, ALLOCATION, EXCHANGE, DIOXIDE",
author = "Vesa Palonen and Jukka Pumpanen and Liisa-Maija Kulmala and Ingeborg Levin and Jussi Heinonsalo and Timo Vesala",
year = "2018",
month = "2",
doi = "10.1017/RDC.2017.95",
language = "English",
volume = "60",
pages = "283--297",
journal = "Radiocarbon",
issn = "0033-8222",
publisher = "UNIV ARIZONA DEPT GEOSCIENCES",
number = "1",

}

Seasonal and Diurnal Variations in Atmospheric and Soil Air 14CO2 in a Boreal Scots Pine Forest. / Palonen, Vesa; Pumpanen, Jukka; Kulmala, Liisa-Maija; Levin, Ingeborg; Heinonsalo, Jussi; Vesala, Timo.

In: Radiocarbon, Vol. 60, No. 1, 02.2018, p. 283-297.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Seasonal and Diurnal Variations in Atmospheric and Soil Air 14CO2 in a Boreal Scots Pine Forest

AU - Palonen, Vesa

AU - Pumpanen, Jukka

AU - Kulmala, Liisa-Maija

AU - Levin, Ingeborg

AU - Heinonsalo, Jussi

AU - Vesala, Timo

PY - 2018/2

Y1 - 2018/2

N2 - 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.

AB - 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.

KW - 1172 Environmental sciences

KW - atmosphere

KW - carbon dioxide

KW - radiocarbon

KW - soil

KW - CARBON BALANCE

KW - CO2 EFFLUX

KW - C-14 DATA

KW - RESPIRATION

KW - DYNAMICS

KW - ROOT

KW - RADIOCARBON

KW - ALLOCATION

KW - EXCHANGE

KW - DIOXIDE

U2 - 10.1017/RDC.2017.95

DO - 10.1017/RDC.2017.95

M3 - Article

VL - 60

SP - 283

EP - 297

JO - Radiocarbon

JF - Radiocarbon

SN - 0033-8222

IS - 1

ER -