Interaction of physical, chemical and biological processes in atmosphere-ocean CO 2 exchange in the Benguela upwelling Lise Lotte Sørensen 1 , Katherine Richardson 3,4 , Merete B. Christiansen 2 , Jesper Nissen 2 , Søren Lund 2 , Lars Christensen 2 , Jørgen Bendtsen 1 , Karen Marie Hilligsøe 1,3 and Lone Mouritsen 3 1 National Environmental Research Institute, University of Aarhus, Denmark 2 Risø-DTU, Denmark 3 University of Aarhus, Denmark 4 Copenhagen University
Interaction of physical, chemical and biological processes in atmosphere-ocean CO 2 exchange in the Benguela upwelling Lise Lotte Sørensen 1, Katherine.
Mar 31, 2015
Welcome message from author
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Interaction of physical, chemical and biological processes in atmosphere-ocean CO2 exchange in the Benguela upwelling
Lise Lotte Sørensen1, Katherine Richardson3,4, Merete B. Christiansen2, Jesper Nissen2, Søren Lund2, Lars Christensen2, Jørgen Bendtsen1, Karen Marie Hilligsøe1,3 and Lone Mouritsen3
1National Environmental Research Institute, University of Aarhus, Denmark2Risø-DTU, Denmark3University of Aarhus, Denmark4Copenhagen University
Since the world became industrialized in 1750 the atmospheric level of CO2 has risen from 270 ppm to 380 ppm.
In the same period the ocean has absorbed nearly 50% but in upwellings areas CO2 is emitted back.
As global warming increases coastal trade winds enhances (Mcgregor 2004)
Does this mean more CO2 is emitted back to the atmosphere making enhanced coastal winds an positive climate feedback process ?
Danish Galathea 3 cruise 2006-2007
ΔpCO2 measurements
Measurements of partial pressure of CO2 in Sea water and in the atmosphere using an equilibrator.
• FCO2 = SCO2 kCO2
pCO2,
Sea water is taken from continous inlet
Direct mesaurements of the flux of CO2 and detailed meteorology
High Chlorophyll concentration at 6:00
0
100
200
300
400
500
600
700
800
900
07-10-06 00:00 08-10-06 00:00 09-10-06 00:00 10-10-06 00:00 11-10-06 00:00 12-10-06 00:00 13-10-06 00:00 14-10-06 00:00
-1
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
pCO2 sea
pCO2 Atm
flux(gC/m2/day)
0
24
68
10
1214
1618
20
07-10-06 00:00 08-10-06 00:00 09-10-06 00:00 10-10-06 00:00 11-10-06 00:00 12-10-06 00:00 13-10-06 00:00 14-10-06 00:000
5
10
15
20
25
30Wind speed
water temp
air temp
Namibia, 13 October 2006
200
300
400
500
600
700
800
900
130000 130500 131000 131500 132000
Time
CO
2 (uatm
)
10
11
12
13
14
15
16
17
18
19
20
Tem
pera
ture
Ocean CO2 Atm CO2 Temp
Upwelling zones: CO2 release
outward crossing high chlorophyl concentration
SOURCE
SINK
Upwelling zones: CO2 releaseNamibia, 13 October 2006
360
362
364
366
368
370
372
130000 130500 131000 131500 132000
Time
CO
2 (uatm
)
10
11
12
13
14
15
16
17
18
19
20
Tem
pera
ture
Ocean CO2 Atm CO2 Temp
12 16 20 24 28 32Tem perature (C )
0
400
800
1200
1600
2000
Hei
ght (
m)
11 O ctober 2006
Atmospheric boundary layers
Conclusions
• Clearly the interaction between the atmosphere and ocean in terms of heat exchange and physical forcing is important to the CO2 fluxes.
• Detailed description of the atmospheric flow and energy fluxes in the coastal areas are important in order to understand and estimate the CO2 fluxes in coastal upwelling regions
AcknowledgementTHANK YOU for your attention and THANKS to:
• Danish Expeditionfond
• Willum Kann Rasmussen
• Nordea Fonden
• FNU
• Knud Højgårds Fond
• Risø-DTU
• the crew on the ship ”VÆDDEREN”
Related Documents
