Sea-surface CO 2 fugacity in the subpolar North Atlantic

International audience We present the first year-long subpolar trans-Atlantic set of surface seawater CO 2 fugacity ( f CO 2 sw ) data. The data were obtained aboard the MV Nuka Arctica in 2005 and provide a quasi-continuous picture of the f CO 2 sw variability between Denmark and Greenland. Complem...

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Bibliographic Details
Main Authors: Olsen, A., Brown, K. R., Chierici, M., Johannessen, T., Neill, C.
Other Authors: Bjerknes Centre for Climate Research (BCCR), Department of Biological Sciences Bergen (BIO / UiB), University of Bergen (UiB)-University of Bergen (UiB), Geophysical Institute Bergen (GFI / BiU), University of Bergen (UiB), Marine Chemistry, Department of Chemistry
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2008
Subjects:
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Greenland
North Atlantic
Online Access:https://hal.science/hal-00297683
https://hal.science/hal-00297683/document
https://hal.science/hal-00297683/file/bg-5-535-2008.pdf
Description
Summary:International audience We present the first year-long subpolar trans-Atlantic set of surface seawater CO 2 fugacity ( f CO 2 sw ) data. The data were obtained aboard the MV Nuka Arctica in 2005 and provide a quasi-continuous picture of the f CO 2 sw variability between Denmark and Greenland. Complementary real-time high-resolution data of surface chlorophyll- a (chl- a ) concentrations and mixed layer depth (MLD) estimates have been collocated with the f CO 2 sw data. Off-shelf f CO 2 sw data exhibit a pronounced seasonal cycle. In winter, surface waters are saturated to slightly supersaturated over a wide range of temperatures. Through spring and summer, f CO 2 sw decreases by approximately 60 ?atm, due to biological carbon consumption, which is not fully counteracted by the f CO 2 sw increase due to summer warming. The changes are synchronous with changes in chl- a concentrations and MLD, both of which are exponentially correlated with f CO 2 sw in off-shelf regions.

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