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CARBOOCEAN Bergen, 5-9 October 2009 http://www.co2.ulg.ac.be/. How much (how little) do we know about inter-annual variability of CO 2 in coastal environments ? D oes it matter ? Can we improve this ?" Alberto V. Borges Chemical Oceanography Unit Université de Liège Belgium - PowerPoint PPT Presentation
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How much (how little) do we know about inter-annual variability of CO2 in coastal environments?
Does it matter ?Can we improve this ?"
Alberto V. Borges
Chemical Oceanography UnitUniversité de Liège
Belgium
www.co2.ulg.ac.be
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Two achievements of CARBOOCEAN were:
- to encourage sustained C observations in coastal environments- compilation of large data-set including the coastal realm (SOCAT)
In this presentation :- Tasmania continental shelf- Celtic Sea and English Channel- North Sea- Scheldt estuary
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Tasmania
Borges et al. (2008) BG 5:141–155
SAM + SAM + SAM +
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Tasmania
Borges et al. (2008) BG 5:141–155
SAM +Wind –
SAM +Wind –
SAM +Wind –
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Tasmania
Borges et al. (2008) BG 5:141–155
SAM +Wind –SST +
SAM +Wind –SST +
SAM +Wind –SST +
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Tasmania
Borges et al. (2008) BG 5:141–155
SAM +Wind –SST +pCO2 –
SAM +Wind –SST +pCO2 –
SAM +Wind –SST +pCO2 –
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Tasmania
SAM +Wind –SST +pCO2 –FCO2 –
SAM +Wind –SST +pCO2 –FCO2 –
SAM +Wind –SST +pCO2 –FCO2 –
Borges et al. (2008) BG 5:141–155
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Tasmania
Warmer yearsLesser mixingLesser ↑ DIC
Cooler yearsMore mixingMore ↑ DIC
Borges et al. (2008) BG 5:141–155
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Celtic Sea & English Channel
Deliverable 12.26
Year-to-year change 50 µatm max.
Year-to-year change 200 µatm max.
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
North Sea
Omar et al. (2009) Ocean Sci. Discuss. 6:1655-1686
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
North Sea
Omar et al. (2009) Ocean Sci. Discuss. 6:1655-1686
Northern Box Southern Box
Year-to-year change 160 µatm
Year-to-year change 220 µatm
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Scheldt estuary
Borges (unpublished)
months
2009
months
2008
dis
tan
ce f
rom
mo
uh
t (k
m)
500 1500 2500 3500 4500 5500 6500 7500
120
110
100
90
80
70
60
50
40
30
20
10
0J F M A M J J A S O N D J F M A M J J A S O N D
River
North Sea
pCO2 (ppm)
7220 ppm 4880 ppm
100 ppm 210 ppm
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Conclusions
Inter-annual Δ drivers
Tasmania + mixingCeltic Sea + mixing (?)English Channel ++ mixing (?)North Sea ++ biologyScheldt estuary +++ nutrient & C river inputs
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Conclusions
How much (how little) do we know about inter-annual variability of CO2 in coastal environments?
Does it matter ?
Can we improve this ?"
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Conclusions
How much (how little) do we know about inter-annual variability of CO2 in coastal environments?
A little, not much
Does it matter ?
Can we improve this ?"
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Open ocean Coastal ocean
Large scale oscillations
Land
Conclusions
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Open ocean Coastal ocean
Large scale oscillations
Land
Conclusions
physics biology
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Open ocean Coastal ocean
Large scale oscillations
CO2Land
Conclusions
physics biology
ΔDIC
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Open ocean Coastal ocean
Large scale oscillations
CO2Land
Conclusions
physics biology
ΔDIC
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Open ocean Coastal ocean
Large scale oscillations
CO2Land
Conclusions
physics biology
ΔDIC
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Open ocean Coastal ocean
Large scale oscillations
CO2Land
Conclusions
physics biology
ΔDIC
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Open ocean Coastal ocean
Large scale oscillations
CO2Land
Conclusions
physics biologyphysics biology
ΔDIC
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Open ocean Coastal ocean
Large scale oscillations
ΔDIC
CO2
ΔDIC
CO2Land
Conclusions
physics biologyphysics biology
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Conclusions
How much (how little) do we know about inter-annual variability of CO2 in coastal environments?
A little, not much
Does it matter ?
Yes
Can we improve this ?"
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Conclusions
sink for atmospheric CO2
22%
Surface area
7%
Coastal ocean
Tasmania : ± 10% inter-annual variability of air-sea CO2 fluxes=> Coastal ocean 20% to 24% of the open ocean CO2 sink
North Sea : ± 50% inter-annual variability of air-sea CO2 fluxes=> Coastal ocean 11% to 33% of the open ocean CO2 sink
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Conclusions
How much (how little) do we know about inter-annual variability of CO2 in coastal environments?
A little, not much
Does it matter ?
Yes
Can we improve this ?"
Yes we can
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Conclusions
- Need for sustained observatories of CO2 in coastal environments
- Need to develop and maintain QCed and uniform format data-bases that include coastal data (SOCAT)
- Describe inter-annual variability and understand underlying mechanisms :
- Data synthesis- regional modelling
CARBOOCEANBergen, 5-9 October 2009http://www.co2.ulg.ac.be/
Open ocean Coastal ocean
Large scale oscillations
ΔDIC
CO2
ΔDIC
CO2Land
Conclusions
physics biologyphysics biology