Biogeochemical variations at the Porcupine Abyssal Plain sustained Observatory in the northeast Atlantic Ocean, from weekly to inter-annual timescales
We present high-resolution autonomous measurements of carbon dioxide partial pressure p (CO 2 ) taken in situ at the Porcupine Abyssal Plain sustained Observatory (PAP-SO) in the northeast Atlantic (49° N, 16.5° W; water depth of 4850 m) for the period 2010–2012. Measurements of p (CO 2 ) made at 30...
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ftcopernicus:oai:publications.copernicus.org:bg26076 2023-05-15T17:35:16+02:00 Biogeochemical variations at the Porcupine Abyssal Plain sustained Observatory in the northeast Atlantic Ocean, from weekly to inter-annual timescales Hartman, S. E. Jiang, Z.-P. Turk, D. Lampitt, R. S. Frigstad, H. Ostle, C. Schuster, U. 2018-09-27 application/pdf https://doi.org/10.5194/bg-12-845-2015 https://www.biogeosciences.net/12/845/2015/ eng eng doi:10.5194/bg-12-845-2015 https://www.biogeosciences.net/12/845/2015/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-12-845-2015 2019-12-24T09:53:47Z We present high-resolution autonomous measurements of carbon dioxide partial pressure p (CO 2 ) taken in situ at the Porcupine Abyssal Plain sustained Observatory (PAP-SO) in the northeast Atlantic (49° N, 16.5° W; water depth of 4850 m) for the period 2010–2012. Measurements of p (CO 2 ) made at 30 m depth on a sensor frame are compared with other autonomous biogeochemical measurements at that depth (including chlorophyll a fluorescence and nitrate concentration data) to analyse weekly to seasonal controls on p (CO 2 ) flux in the inter-gyre region of the North Atlantic. Comparisons are also made with in situ regional time series data from a ship of opportunity and mixed layer depth (MLD) measurements from profiling Argo floats. There is a persistent under-saturation of CO 2 in surface waters throughout the year which gives rise to a perennial CO 2 sink. Comparison with an earlier data set collected at the site (2003–2005) confirms seasonal and inter-annual changes in surface seawater chemistry. There is year-to-year variability in the timing of deep winter mixing and the intensity of the spring bloom. The 2010–2012 period shows an overall increase in p (CO 2 ) values when compared to the 2003–2005 period as would be expected from increases due to anthropogenic CO 2 emissions. The surface temperature, wind speed and MLD measurements are similar for both periods of time. Future work should incorporate daily CO 2 flux measurements made using CO 2 sensors at 1 m depth and the in situ wind speed data now available from the UK Met Office Buoy. Text North Atlantic Northeast Atlantic Copernicus Publications: E-Journals Biogeosciences 12 3 845 853 |
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English |
description |
We present high-resolution autonomous measurements of carbon dioxide partial pressure p (CO 2 ) taken in situ at the Porcupine Abyssal Plain sustained Observatory (PAP-SO) in the northeast Atlantic (49° N, 16.5° W; water depth of 4850 m) for the period 2010–2012. Measurements of p (CO 2 ) made at 30 m depth on a sensor frame are compared with other autonomous biogeochemical measurements at that depth (including chlorophyll a fluorescence and nitrate concentration data) to analyse weekly to seasonal controls on p (CO 2 ) flux in the inter-gyre region of the North Atlantic. Comparisons are also made with in situ regional time series data from a ship of opportunity and mixed layer depth (MLD) measurements from profiling Argo floats. There is a persistent under-saturation of CO 2 in surface waters throughout the year which gives rise to a perennial CO 2 sink. Comparison with an earlier data set collected at the site (2003–2005) confirms seasonal and inter-annual changes in surface seawater chemistry. There is year-to-year variability in the timing of deep winter mixing and the intensity of the spring bloom. The 2010–2012 period shows an overall increase in p (CO 2 ) values when compared to the 2003–2005 period as would be expected from increases due to anthropogenic CO 2 emissions. The surface temperature, wind speed and MLD measurements are similar for both periods of time. Future work should incorporate daily CO 2 flux measurements made using CO 2 sensors at 1 m depth and the in situ wind speed data now available from the UK Met Office Buoy. |
format |
Text |
author |
Hartman, S. E. Jiang, Z.-P. Turk, D. Lampitt, R. S. Frigstad, H. Ostle, C. Schuster, U. |
spellingShingle |
Hartman, S. E. Jiang, Z.-P. Turk, D. Lampitt, R. S. Frigstad, H. Ostle, C. Schuster, U. Biogeochemical variations at the Porcupine Abyssal Plain sustained Observatory in the northeast Atlantic Ocean, from weekly to inter-annual timescales |
author_facet |
Hartman, S. E. Jiang, Z.-P. Turk, D. Lampitt, R. S. Frigstad, H. Ostle, C. Schuster, U. |
author_sort |
Hartman, S. E. |
title |
Biogeochemical variations at the Porcupine Abyssal Plain sustained Observatory in the northeast Atlantic Ocean, from weekly to inter-annual timescales |
title_short |
Biogeochemical variations at the Porcupine Abyssal Plain sustained Observatory in the northeast Atlantic Ocean, from weekly to inter-annual timescales |
title_full |
Biogeochemical variations at the Porcupine Abyssal Plain sustained Observatory in the northeast Atlantic Ocean, from weekly to inter-annual timescales |
title_fullStr |
Biogeochemical variations at the Porcupine Abyssal Plain sustained Observatory in the northeast Atlantic Ocean, from weekly to inter-annual timescales |
title_full_unstemmed |
Biogeochemical variations at the Porcupine Abyssal Plain sustained Observatory in the northeast Atlantic Ocean, from weekly to inter-annual timescales |
title_sort |
biogeochemical variations at the porcupine abyssal plain sustained observatory in the northeast atlantic ocean, from weekly to inter-annual timescales |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-12-845-2015 https://www.biogeosciences.net/12/845/2015/ |
genre |
North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Northeast Atlantic |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-12-845-2015 https://www.biogeosciences.net/12/845/2015/ |
op_doi |
https://doi.org/10.5194/bg-12-845-2015 |
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Biogeosciences |
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12 |
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3 |
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845 |
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853 |
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