1. University of Bergen Ingunn Skjelvan, Siv Lauvset, Truls Johannessen
SA 3 Station M - Norwegian Sea pH and pCO2 time series for ocean acidification estimates
University of Bergen
Ingunn Skjelvan, Siv Lauvset, Truls Johannessen
General Assembly 2017
Vilanova i la Geltrú, Spain; 27 – 29 June 2017

2. Station M 66°N 2°E in the Norwegian Atlantic Current +0.15C /
S. Österhus
+0.15C /
35 years

3. Station M
Deep mooring T S pH
pCO2 O2
Surface buoy T S pH
pCO2 (sea & air)
Chl-a O2

4. Surface SA 3 - Station M Increasing amount of CO2 CO2 undersaturation
WP 10 – Service Activities
Surface
Increasing amount of CO2
CO2 undersaturation
Sink for atmospheric CO2
ocean uptake

5. Ocean Acidification Atmosphere Ocean i.e. 26% more acidic ocean Ocean
WP 10 – Service Activities
Atmosphere
Ocean
< 0,1 pH units
i.e. 26% more acidic ocean
Ocean
CO32- (carbonate)
used in skeletons and shells in marine organisms
degree of CO32- saturation
< 1  carbonate corrosion

6. Surface SA 3 - Station M Ocean Acidification …
WP 10 – Service Activities
Surface
Ocean Acidification …
yr-1
… at a faster speed than the global mean
degree of CO32- saturation
-0.02 yr-1

7. Sub-surface SA 3 - Station M 150 m depth 200 m depth
WP 10 – Service Activities
Sub-surface
degree of CO32- saturation
degree of CO32- saturation
CO32- oversaturation
CO32- undersaturation
150 m depth
200 m depth