Transcript The T3L3 experiment; current status and plans Sander Houweling (SRON/IMAU) Stefan Körner (BGC-Jena) All participants.

The T3L3 experiment;
current status and plans
Sander Houweling (SRON/IMAU)
Stefan Körner (BGC-Jena)
All participants
Aim of the experiment
 What other factors, besides transport model
differences,limit the robustness of CO2 inversions?
(…. optimization method, boundary conditions)
 How important are these factors?
Experimental outline
 Inversion 1: Reproduce a very simple bayesian
set-up
(same methods, same bound. cond.)
 Inversion 2: as 1 using own preferred method
(different methods, same bound. cond.)
 Inversion 3: as 2 using own data & assumptions
(different methods, different bound. cond.)
Who participated?
 JMA-CDTM; Maki; change Globalview - WDCGG
 LMDZ; Carouge; 35 regions, 21 additional stations
 MATCH; Law; mass-balance inversion
 MATCH; Law; 116 region inversion
 NIES; Patra; 64 regions
 NIRE; Taguchi; Actual meteorology
 TM3; Roedenbeck/Houweling; 730 regions +covar
Problems …
 Inversion 2 / 3 not purely separated
 Sometimes only one of both submitted
 Some inversions are perturbations of T3L2
Inversion 1 against reference
South America Tropical
Subm.
Ref.
Inversion 1 against reference
North America Boreal
Ref.
Subm.
Example of Inv1, Inv2, Inv3
Eurasia Temperate
Inv 1:
Example of Inv1, Inv2, Inv3
Eurasia Temperate
Inv 2:
Example of Inv1, Inv2, Inv3
Eurasia Temperate
Inv 3:
Offset corrected & larger scales …
NH. Extra Tropics
Inv 1:
Offset corrected & larger scales …
NH. Extra Tropics
Inv 2:
Offset corrected & larger scales …
NH. Extra Tropics
Inv 3:
Even larger …
All Continents
Inv 1:
Even larger …
All Continents
Inv 2:
Even larger …
All Continents
Inv 3:
Long-term means
Tropics
NH-ex.trop
SH-ex.trop.
Continents Oceans
Globe
Long-term trend
Tropics
NH-ex.trop
SH-ex.trop.
Continents Oceans
Globe
Correlation of AIV
N. Atlantic Temp.
Ind. Trop. Ocean
Europe
Conclusions
 ‘robust’ AIV looses some robustness in T3L3
- The role of method/boundary conditions not yet clear
- Only the largest scales remain rather robust
 Long/term mean en trend seem less affected
by methodology
 Inversions remain robust regarding e.g.:
- Correlation El-Nino, Pinatubo
- Continental sink temperate N.H.
- Less then Takahashi uptake in the Southern Ocean
How to proceed?
 Further study of the difference between inv 2, inv 3
doesn’t look promising right now…
 Archive of state of the art inversions in comparable
format still relevant!