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| Titel |
Biogeochemical variations at the Porcupine Abyssal Plain Sustained Observatory (PAP-SO) in the northeast Atlantic Ocean |
| VerfasserIn |
Susan Hartman, Richard Lampitt, Ute Schuster, Zongpei Jiang, Helene Frigstad, Clare Ostle |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126932
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| Publikation (Nr.) |
 EGU/EGU2016-6728.pdf |
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| Zusammenfassung |
| We examine high-resolution autonomous measurements of carbon
dioxide partial pressure p(CO2) taken in situ at the FixO3 Porcupine Abyssal Plain sustained
observatory (PAP-SO) site in the northeast Atlantic (49∘ N, 16.5∘ W; water depth of 4850 m)
for the period 2010 to 2012. Measurements of p(CO2) 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 analyze weekly to seasonal
controls on p(CO2) 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 CO2 in surface waters throughout the year which gives rise to a perennial
CO2 sink. Comparison with an earlier dataset collected at the site (2003 to 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. |
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