Inorganic carbon time series at Ocean Weather Station M in the Norwegian SeaReport as inadecuate

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1 Bjerknes Centre for Climate Research 2 Geophysical Institute Bergen 3 Institute of Marine Research

Abstract : Dissolved inorganic carbon CT has been collected at Ocean Weather Station M OWSM in the Norwegian Sea since 2001. Seasonal variations in CT are confined to the upper 50 m, where the biology is active, and below this layer no clear seasonal signal is seen. From winter to summer the surface CT concentration typical drop from 2140 to about 2040 ?mol kg?1, while a deep water CT concentration of about 2163 ?mol kg?1 is measured throughout the year. Observations show an annual increase in salinity normalized carbon concentration nCT of 1.3±0.7 ?mol kg?1 yr?1 in the surface layer, which is equivalent to a pCO2 increase of 2.6±1.2 ?atm yr?1, i.e. larger than the atmospheric increase in this area 2.1±0.2 ?atm yr-1. Observations also show an annual increase in the deep water nCT of 0.57±0.24 ?mol kg?1 yr?1, of which about 15% is due to inflow of old Arctic water with larger amounts of remineralised matter. The remaining part has an anthropogenic origin and sources for this might be Greenland Sea surface water, Iceland Sea surface water, and-or recirculated Atlantic Water. By using an extended multi linear regression method eMLR it is verified that anthropogenic carbon has entered the whole water column at OWSM.

Author: I. Skjelvan - E. Falck - F. Rey - S. B. Kringstad -



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