Norwegian Sea net community production estimated from O2 and prototype CO2 optode measurements on a Seaglider
We report on a pilot study using a CO2 optode deployed on a Seaglider in the Norwegian Sea from March to October 2014. The optode measurements required drift and lag correction and in situ calibration using discrete water samples collected in the vicinity. We found that the optode signal correlated...
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Online Access: | https://hdl.handle.net/11250/3133142 https://doi.org/10.5194/os-17-593-2021 |
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ftnorce:oai:norceresearch.brage.unit.no:11250/3133142 2024-06-23T07:55:43+00:00 Norwegian Sea net community production estimated from O2 and prototype CO2 optode measurements on a Seaglider Possenti, Luca Skjelvan, Ingunn Atamanchuk, Dariia Tengberg, Anders Humphreys, Matthew P. Loucaides, Socratis Fernand, Liam Kaiser, Jan 2021 application/pdf https://hdl.handle.net/11250/3133142 https://doi.org/10.5194/os-17-593-2021 eng eng Natural Environment Research Council: NE/N012070/1 Ocean Science. 2021, 17 593-614. urn:issn:1812-0784 https://hdl.handle.net/11250/3133142 https://doi.org/10.5194/os-17-593-2021 cristin:1998046 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © Author(s) 2021 Ocean Science 17 593-614 Journal article Peer reviewed 2021 ftnorce https://doi.org/10.5194/os-17-593-2021 2024-06-09T23:34:16Z We report on a pilot study using a CO2 optode deployed on a Seaglider in the Norwegian Sea from March to October 2014. The optode measurements required drift and lag correction and in situ calibration using discrete water samples collected in the vicinity. We found that the optode signal correlated better with the concentration of CO2, c(CO2), than with its partial pressure, p(CO2). Using the calibrated c(CO2) and a regional parameterisation of total alkalinity (AT) as a function of temperature and salinity, we calculated total dissolved inorganic carbon content, c(DIC), which had a standard deviation of 11 µmol kg−1 compared with in situ measurements. The glider was also equipped with an oxygen (O2) optode. The O2 optode was drift corrected and calibrated using a c(O2) climatology for deep samples. The calibrated data enabled the calculation of DIC- and O2-based net community production, N(DIC) and N(O2). To derive N, DIC and O2 inventory changes over time were combined with estimates of air–sea gas exchange, diapycnal mixing and entrainment of deeper waters. Glider-based observations captured two periods of increased Chl a inventory in late spring (May) and a second one in summer (June). For the May period, we found N(DIC) = (21±5) mmol m−2 d−1, N(O2) = (94±16) mmol m−2 d−1 and an (uncalibrated) Chl a peak concentration of craw(Chl a) = 3 mg m−3. During the June period, craw(Chl a) increased to a summer maximum of 4 mg m−3, associated with N(DIC) = (85±5) mmol m−2 d−1 and N(O2) = (126±25) mmol m−2 d−1. The high-resolution dataset allowed for quantification of the changes in N before, during and after the periods of increased Chl a inventory. After the May period, the remineralisation of the material produced during the period of increased Chl a inventory decreased N(DIC) to (−3±5) mmol m−2 d−1 and N(O2) to (0±2) mmol m−2 d−1. The survey area was a source of O2 and a sink of CO2 for most of the summer. The deployment captured two different surface waters influenced by the Norwegian Atlantic Current (NwAC) and ... Article in Journal/Newspaper Norwegian Sea NORCE vitenarkiv (Norwegian Research Centre) Norwegian Sea Ocean Science 17 2 593 614 |
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Open Polar |
collection |
NORCE vitenarkiv (Norwegian Research Centre) |
op_collection_id |
ftnorce |
language |
English |
description |
We report on a pilot study using a CO2 optode deployed on a Seaglider in the Norwegian Sea from March to October 2014. The optode measurements required drift and lag correction and in situ calibration using discrete water samples collected in the vicinity. We found that the optode signal correlated better with the concentration of CO2, c(CO2), than with its partial pressure, p(CO2). Using the calibrated c(CO2) and a regional parameterisation of total alkalinity (AT) as a function of temperature and salinity, we calculated total dissolved inorganic carbon content, c(DIC), which had a standard deviation of 11 µmol kg−1 compared with in situ measurements. The glider was also equipped with an oxygen (O2) optode. The O2 optode was drift corrected and calibrated using a c(O2) climatology for deep samples. The calibrated data enabled the calculation of DIC- and O2-based net community production, N(DIC) and N(O2). To derive N, DIC and O2 inventory changes over time were combined with estimates of air–sea gas exchange, diapycnal mixing and entrainment of deeper waters. Glider-based observations captured two periods of increased Chl a inventory in late spring (May) and a second one in summer (June). For the May period, we found N(DIC) = (21±5) mmol m−2 d−1, N(O2) = (94±16) mmol m−2 d−1 and an (uncalibrated) Chl a peak concentration of craw(Chl a) = 3 mg m−3. During the June period, craw(Chl a) increased to a summer maximum of 4 mg m−3, associated with N(DIC) = (85±5) mmol m−2 d−1 and N(O2) = (126±25) mmol m−2 d−1. The high-resolution dataset allowed for quantification of the changes in N before, during and after the periods of increased Chl a inventory. After the May period, the remineralisation of the material produced during the period of increased Chl a inventory decreased N(DIC) to (−3±5) mmol m−2 d−1 and N(O2) to (0±2) mmol m−2 d−1. The survey area was a source of O2 and a sink of CO2 for most of the summer. The deployment captured two different surface waters influenced by the Norwegian Atlantic Current (NwAC) and ... |
format |
Article in Journal/Newspaper |
author |
Possenti, Luca Skjelvan, Ingunn Atamanchuk, Dariia Tengberg, Anders Humphreys, Matthew P. Loucaides, Socratis Fernand, Liam Kaiser, Jan |
spellingShingle |
Possenti, Luca Skjelvan, Ingunn Atamanchuk, Dariia Tengberg, Anders Humphreys, Matthew P. Loucaides, Socratis Fernand, Liam Kaiser, Jan Norwegian Sea net community production estimated from O2 and prototype CO2 optode measurements on a Seaglider |
author_facet |
Possenti, Luca Skjelvan, Ingunn Atamanchuk, Dariia Tengberg, Anders Humphreys, Matthew P. Loucaides, Socratis Fernand, Liam Kaiser, Jan |
author_sort |
Possenti, Luca |
title |
Norwegian Sea net community production estimated from O2 and prototype CO2 optode measurements on a Seaglider |
title_short |
Norwegian Sea net community production estimated from O2 and prototype CO2 optode measurements on a Seaglider |
title_full |
Norwegian Sea net community production estimated from O2 and prototype CO2 optode measurements on a Seaglider |
title_fullStr |
Norwegian Sea net community production estimated from O2 and prototype CO2 optode measurements on a Seaglider |
title_full_unstemmed |
Norwegian Sea net community production estimated from O2 and prototype CO2 optode measurements on a Seaglider |
title_sort |
norwegian sea net community production estimated from o2 and prototype co2 optode measurements on a seaglider |
publishDate |
2021 |
url |
https://hdl.handle.net/11250/3133142 https://doi.org/10.5194/os-17-593-2021 |
geographic |
Norwegian Sea |
geographic_facet |
Norwegian Sea |
genre |
Norwegian Sea |
genre_facet |
Norwegian Sea |
op_source |
Ocean Science 17 593-614 |
op_relation |
Natural Environment Research Council: NE/N012070/1 Ocean Science. 2021, 17 593-614. urn:issn:1812-0784 https://hdl.handle.net/11250/3133142 https://doi.org/10.5194/os-17-593-2021 cristin:1998046 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © Author(s) 2021 |
op_doi |
https://doi.org/10.5194/os-17-593-2021 |
container_title |
Ocean Science |
container_volume |
17 |
container_issue |
2 |
container_start_page |
593 |
op_container_end_page |
614 |
_version_ |
1802648401799544832 |