Abstract
| Original language | English |
|---|---|
| Journal | Radiocarbon |
| Volume | 60 |
| Issue number | 1 |
| Pages (from-to) | 283-297 |
| Number of pages | 15 |
| ISSN | 0033-8222 |
| DOIs | |
| Publication status | Published - Feb 2018 |
| MoE publication type | A1 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
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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 journal › Article › Scientific › peer-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 -