Winter CO2 emission and its production rate in cold temperate soils of northern Japan: 222Rn as a proxy for the validation of CO2 diffusivity
In the context of a changing seasonal snow-covered period and extent in northern high latitude regions, winter CO2 emissions are vulnerable to drastic climate change, prompting rigorous evaluation of regional carbon budgets. The significance of winter CO2 contributions to the atmosphere in these reg...
Published in: | Polar Science |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2019
|
Subjects: | |
Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15997 http://id.nii.ac.jp/1291/00015887/ |
id |
ftnipr:oai:nipr.repo.nii.ac.jp:00015997 |
---|---|
record_format |
openpolar |
spelling |
ftnipr:oai:nipr.repo.nii.ac.jp:00015997 2023-05-15T18:02:48+02:00 Winter CO2 emission and its production rate in cold temperate soils of northern Japan: 222Rn as a proxy for the validation of CO2 diffusivity 2019-12 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15997 http://id.nii.ac.jp/1291/00015887/ en eng https://doi.org/10.1016/j.polar.2019.09.002 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15997 http://id.nii.ac.jp/1291/00015887/ Polar Science, 22, 100480(2019-12) 18739652 CO2 Diffusivity and Transfer velocity Winter CO2 Emission 222Rn Tracer Static Chamber CO2 Production Rate Journal Article 2019 ftnipr https://doi.org/10.1016/j.polar.2019.09.002 2022-12-03T19:43:16Z In the context of a changing seasonal snow-covered period and extent in northern high latitude regions, winter CO2 emissions are vulnerable to drastic climate change, prompting rigorous evaluation of regional carbon budgets. The significance of winter CO2 contributions to the atmosphere in these regions has likewise been recognized. In this study, concentrations of CO2 and 222Rn were observed in the snowpack and underlying cold temperate soils of northern Japan during two winter seasons. Winter CO2 emissions, estimated alternately by snow density, 222Rn tracer (under steady and non-steady states), and chamber, were 56 ± 2, 42 ± 6, 44 ± 15, and 34 ± 3 gCO2-C/m2/season, respectively, suggesting that contribution from average winter CO2 emission corresponds to 25% (range: 19–33%) of annual emission. Winter CO2 emission is highly regulated by soil temperature at 5 cm, depending on snow depth. Winter CO2 emission transport is not suppressed through the snowpack to the atmosphere; rather it is stimulated when seasonal snow depth is over the 40-cm threshold in the soils. The higher soil CO2 production of 0.11 ± 0.02 gCO2-C/m3/h estimated by 222Rn transfer velocity reflects vigorous microbial activity in soils underlying winter snowpack. Therefore, 222Rn is an important proxy for the estimation of winter CO2 emission and diffusivity in snowpack, and of CO2 production rate and transfer velocity in the seasonal, snow-covered. Article in Journal/Newspaper Polar Science Polar Science National Institute of Polar Research Repository, Japan Polar Science 22 100480 |
institution |
Open Polar |
collection |
National Institute of Polar Research Repository, Japan |
op_collection_id |
ftnipr |
language |
English |
topic |
CO2 Diffusivity and Transfer velocity Winter CO2 Emission 222Rn Tracer Static Chamber CO2 Production Rate |
spellingShingle |
CO2 Diffusivity and Transfer velocity Winter CO2 Emission 222Rn Tracer Static Chamber CO2 Production Rate Winter CO2 emission and its production rate in cold temperate soils of northern Japan: 222Rn as a proxy for the validation of CO2 diffusivity |
topic_facet |
CO2 Diffusivity and Transfer velocity Winter CO2 Emission 222Rn Tracer Static Chamber CO2 Production Rate |
description |
In the context of a changing seasonal snow-covered period and extent in northern high latitude regions, winter CO2 emissions are vulnerable to drastic climate change, prompting rigorous evaluation of regional carbon budgets. The significance of winter CO2 contributions to the atmosphere in these regions has likewise been recognized. In this study, concentrations of CO2 and 222Rn were observed in the snowpack and underlying cold temperate soils of northern Japan during two winter seasons. Winter CO2 emissions, estimated alternately by snow density, 222Rn tracer (under steady and non-steady states), and chamber, were 56 ± 2, 42 ± 6, 44 ± 15, and 34 ± 3 gCO2-C/m2/season, respectively, suggesting that contribution from average winter CO2 emission corresponds to 25% (range: 19–33%) of annual emission. Winter CO2 emission is highly regulated by soil temperature at 5 cm, depending on snow depth. Winter CO2 emission transport is not suppressed through the snowpack to the atmosphere; rather it is stimulated when seasonal snow depth is over the 40-cm threshold in the soils. The higher soil CO2 production of 0.11 ± 0.02 gCO2-C/m3/h estimated by 222Rn transfer velocity reflects vigorous microbial activity in soils underlying winter snowpack. Therefore, 222Rn is an important proxy for the estimation of winter CO2 emission and diffusivity in snowpack, and of CO2 production rate and transfer velocity in the seasonal, snow-covered. |
format |
Article in Journal/Newspaper |
title |
Winter CO2 emission and its production rate in cold temperate soils of northern Japan: 222Rn as a proxy for the validation of CO2 diffusivity |
title_short |
Winter CO2 emission and its production rate in cold temperate soils of northern Japan: 222Rn as a proxy for the validation of CO2 diffusivity |
title_full |
Winter CO2 emission and its production rate in cold temperate soils of northern Japan: 222Rn as a proxy for the validation of CO2 diffusivity |
title_fullStr |
Winter CO2 emission and its production rate in cold temperate soils of northern Japan: 222Rn as a proxy for the validation of CO2 diffusivity |
title_full_unstemmed |
Winter CO2 emission and its production rate in cold temperate soils of northern Japan: 222Rn as a proxy for the validation of CO2 diffusivity |
title_sort |
winter co2 emission and its production rate in cold temperate soils of northern japan: 222rn as a proxy for the validation of co2 diffusivity |
publishDate |
2019 |
url |
https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15997 http://id.nii.ac.jp/1291/00015887/ |
genre |
Polar Science Polar Science |
genre_facet |
Polar Science Polar Science |
op_relation |
https://doi.org/10.1016/j.polar.2019.09.002 https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=15997 http://id.nii.ac.jp/1291/00015887/ Polar Science, 22, 100480(2019-12) 18739652 |
op_doi |
https://doi.org/10.1016/j.polar.2019.09.002 |
container_title |
Polar Science |
container_volume |
22 |
container_start_page |
100480 |
_version_ |
1766173446065094656 |