surprisingly high anthropogenic co 2 in the eastern mediterranean
DESCRIPTION
Surprisingly high anthropogenic CO 2 in the eastern Mediterranean. A. Schneider, T. Tanhua, A. Körtzinger, D.W.R. Wallace. Thermohaline circulation. Meteor 51/2 in 2001. Salinity, Temperature, Oxygen Dissolved inorganic carbon Total alkalinity CFC-12. Thyrranian Sea. - PowerPoint PPT PresentationTRANSCRIPT
Surprisingly high anthropogenic CO2 in the eastern Mediterranean
A. Schneider, T. Tanhua, A. Körtzinger, D.W.R. Wallace
Thermohaline circulation
Meteor 51/2 in 2001
• Salinity, Temperature, Oxygen• Dissolved inorganic carbon• Total alkalinity• CFC-12
Thyrranian Sea
Transit time distribution (TTD)
Mean age
CFC-12 concentrations
TTD with a mean age
Atmospheric history of CO2 + TTD
Anthropogenic carbon (Cant)
Results
Total Cant Inventories
Mediterranean Sea compared to World Ocean:
0.3 % of the water volume
1.1 % of the Cant
Hypothesis
Why is the uptake higher?
• Low Revelle Factor (9-10)
• Deep water formation
Conclusions
• CFC-12 and Cant have penetrated the entire water column
• High Cant inventories
• Deep water formation areas are of great importance
• Influence on the global ocean
• Measurements in the marginal seas are needed
Flux calculations
Water Volume [Sv]
Cant
[Tg C yr-1]
Atlantic inflow +0.89 +21.6
Mediterranean outflow -0.85 -18.0
Net flux +0.04 +3.6
• Good agreement with Huertas et al. 2009 using the ΔC* method: +4.2 Tg C yr-1
• Aït-Ameur & Goyet using the TrOCA method: opposite flux
Cant Column Inventories
from Waugh et al. 2006
Transit time distribution (TTD)
Age1Age3
Age2
Age2
Age3Age1
Transit time distribution (TTD)
CFC-12 concentrations
atmospheric history
assumptions for saturation and mixing
Transit time distribution (TTD)
Mean age
Transit time distribution (TTD)A
nthropogenic CO
2 [ppm]
100
80
70
60
50
90
120
110
You get:
Anthropogenic Carbon (Cant)
Transit time distribution (TTD)
Transit time distribution (TTD)
Mean age = 30 yrs
Width = 0.1
Width = 1
Width = 10
Width = 30
Width = 45
Width = 15Mean age = 30
Width = 30Mean age = 30