On the use of O2/Ar and O2/N2 to estimate the biological carbon uptake in landfast sea ice
Sea ice is one of the largest biomes on Earth. The net community production (NCP) of the microorganisms living in sea ice impacts the dynamics of pCO2 in sea ice, and therefore the CO2 exchanges at the air-ice-sea interfaces. As oxygen O2 and carbon C are both involved in the photosynthetic and resp...
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ftorbi:oai:orbi.ulg.ac.be:2268/158339 2024-04-21T08:11:07+00:00 On the use of O2/Ar and O2/N2 to estimate the biological carbon uptake in landfast sea ice Zhou, Jiayun Delille, Bruno Brabant, F. Tison, J.-L. 2014-03 https://orbi.uliege.be/handle/2268/158339 en eng https://orbi.uliege.be/handle/2268/158339 info:hdl:2268/158339 International Symposium on Sea Ice in a Changing Environment, Hobart, Australia [AU], 10-14 March 2014 Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique conference poster not in proceedings http://purl.org/coar/resource_type/c_18co info:eu-repo/semantics/conferencePoster 2014 ftorbi 2024-03-27T14:45:31Z Sea ice is one of the largest biomes on Earth. The net community production (NCP) of the microorganisms living in sea ice impacts the dynamics of pCO2 in sea ice, and therefore the CO2 exchanges at the air-ice-sea interfaces. As oxygen O2 and carbon C are both involved in the photosynthetic and respiration processes, one can theoretically assess NCP (in terms of C uptake) from O2 measurements. However, the concentration of O2 in sea ice depends not only on biological processes (i.e., NCP) but also on physical processes. We present a technique for assessing NCP in sea ice, based on the use of the O2/Ar ratio, which should correct for the physical contribution in O2 variations. We also compare the use of O2/Ar and O2/N2 for deriving NCP, and demonstrate that O2/Ar is more suitable, as it is more sensitive and less affected by gas diffusion and gas bubble formation during sea ice growth and decay than O2/N2. Using O2/Ar, we then provide conservative estimates of NCP in landfast sea ice, from ice cores collected in Barrow, from January through June 2009. The minimum estimate of the NCP in the whole ice cover reached 229 mg C.m-².d-1 in late spring. This is about 20 times higher than the atmospheric C uptake at that time identified from CO2 fluxes measurements at the ice-air interface, and therefore indicates that the main source of C used in the NCP was from the under-ice water. Conference Object Sea ice University of Liège: ORBi (Open Repository and Bibliography) |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Zhou, Jiayun Delille, Bruno Brabant, F. Tison, J.-L. On the use of O2/Ar and O2/N2 to estimate the biological carbon uptake in landfast sea ice |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
Sea ice is one of the largest biomes on Earth. The net community production (NCP) of the microorganisms living in sea ice impacts the dynamics of pCO2 in sea ice, and therefore the CO2 exchanges at the air-ice-sea interfaces. As oxygen O2 and carbon C are both involved in the photosynthetic and respiration processes, one can theoretically assess NCP (in terms of C uptake) from O2 measurements. However, the concentration of O2 in sea ice depends not only on biological processes (i.e., NCP) but also on physical processes. We present a technique for assessing NCP in sea ice, based on the use of the O2/Ar ratio, which should correct for the physical contribution in O2 variations. We also compare the use of O2/Ar and O2/N2 for deriving NCP, and demonstrate that O2/Ar is more suitable, as it is more sensitive and less affected by gas diffusion and gas bubble formation during sea ice growth and decay than O2/N2. Using O2/Ar, we then provide conservative estimates of NCP in landfast sea ice, from ice cores collected in Barrow, from January through June 2009. The minimum estimate of the NCP in the whole ice cover reached 229 mg C.m-².d-1 in late spring. This is about 20 times higher than the atmospheric C uptake at that time identified from CO2 fluxes measurements at the ice-air interface, and therefore indicates that the main source of C used in the NCP was from the under-ice water. |
format |
Conference Object |
author |
Zhou, Jiayun Delille, Bruno Brabant, F. Tison, J.-L. |
author_facet |
Zhou, Jiayun Delille, Bruno Brabant, F. Tison, J.-L. |
author_sort |
Zhou, Jiayun |
title |
On the use of O2/Ar and O2/N2 to estimate the biological carbon uptake in landfast sea ice |
title_short |
On the use of O2/Ar and O2/N2 to estimate the biological carbon uptake in landfast sea ice |
title_full |
On the use of O2/Ar and O2/N2 to estimate the biological carbon uptake in landfast sea ice |
title_fullStr |
On the use of O2/Ar and O2/N2 to estimate the biological carbon uptake in landfast sea ice |
title_full_unstemmed |
On the use of O2/Ar and O2/N2 to estimate the biological carbon uptake in landfast sea ice |
title_sort |
on the use of o2/ar and o2/n2 to estimate the biological carbon uptake in landfast sea ice |
publishDate |
2014 |
url |
https://orbi.uliege.be/handle/2268/158339 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
International Symposium on Sea Ice in a Changing Environment, Hobart, Australia [AU], 10-14 March 2014 |
op_relation |
https://orbi.uliege.be/handle/2268/158339 info:hdl:2268/158339 |
_version_ |
1796952780217253888 |