%0 journal article
%@ 2169-8961
%A Omar, A., Thomas, H., Olsen, A., Becker, M., Skjelvan, I., Reverdin, G.

%D 2019
%J Journal of Geophysical Research : Biogeosciences
%N 10
%P 3088-3103 
%R doi:10.1029/2018JG004992
%T Trends of Ocean Acidification and pCO2 in the Northern North Sea, 2003–2015
%U https://doi.org/10.1029/2018JG004992
10 
%X In the northern North Sea, pCO2, pH, and Ωar are subject to strong seasonal variations with mean wintertime values of 375 ± 11 μatm, 8.17 ± 0.01, and 1.96 ± 0.05. Dissolved inorganic carbon is found to be the primary driver of both seasonal and interannual changes while total alkalinity and sea surface temperature have secondary effects that reduce the changes produced by dissolved inorganic carbon. Average interannual variations during winter are around 3%, 0.1%, and 2% for pCO2, pH, and Ωar, respectively and slightly larger in the eastern part of the study area (Skagerrak region) than in the western part (North Atlantic Water region). Statistically significant long‐term trends were found only in the North Atlantic Water region with mean annual rates of 2.39 ± 0.58 μatm/year, −0.0024 ± 0.001 year‐1, and −0.010 ± 0.003 year‐1 for pCO2, pH, and Ωar, respectively. The drivers of the observed trends as well as reasons for the lack of statistically significant trends in the Skagerrak region are discussed.