Winter weather controls net influx of atmospheric CO2 on the north-west European shelf


Contact
Mario.Hoppema [ at ] awi.de

Abstract

Shelf seas play an important role in the global carbon cycle, absorbing atmospheric carbon dioxide (CO2) and exporting carbon (C) to the open ocean and sediments. The magnitude of these processes is poorly constrained, because observations are typically interpolated over multiple years. Here, we used 298500 observations of CO2 fugacity (fCO2) from a single year (2015), to estimate the net influx of atmospheric CO2 as 26.2 ± 4.7 Tg C yr−1 over the open NW European shelf. CO2 influx from the atmosphere was dominated by influx during winter as a consequence of high winds, despite a smaller, thermallydriven, air-sea fCO 2 gradient compared to the larger, biologically-driven summer gradient. In order to understand this climate regulation service, we constructed a carbon-budget supplemented by data from the literature, where the NW European shelf is treated as a box with carbon entering and leaving the box. This budget showed that net C-burial was a small sink of 1.3 ± 3.1 Tg C yr−1, while CO2 efflux from estuaries to the atmosphere, removed the majority of river C-inputs. In contrast, the input from the Baltic Sea likely contributes to net export via the continental shelf pump and advection (34.4 ± 6.0 Tg C yr−1).



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Research Networks
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
50828
DOI 10.1038/s41598-019-56363-5

Cite as
Kitidis, V. , Shutler, J. D. , Ashton, I. , Warren, M. , Brown, I. , Findlay, H. , Hartman, S. E. , Sanders, R. , Humphreys, M. , Kivimäe, C. , Greenwood, N. , Hull, T. , Pearce, D. , McGrath, T. , Stewart, B. M. , Walsham, P. , McGovern, E. , Bozec, Y. , Gac, J. P. , van Heuven, S. M. A. C. , Hoppema, M. , Schuster, U. , Johannessen, T. , Omar, A. , Lauvset, S. K. , Skjelvan, I. , Olsen, A. , Steinhoff, T. , Körtzinger, A. , Becker, M. , Lefevre, N. , Diverrès, D. , Gkritzalis, T. , Cattrijsse, A. , Petersen, W. , Voynova, Y. G. , Chapron, B. , Grouazel, A. , Land, P. E. , Sharples, J. and Nightingale, P. D. (2019): Winter weather controls net influx of atmospheric CO2 on the north-west European shelf , Nature Scientific Reports, 9 , p. 20153 . doi: 10.1038/s41598-019-56363-5


Share


Citation

Research Platforms

Campaigns


Actions
Edit Item Edit Item