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ICBP-Newsletter misunderstandings about the AWI-model
- Subject: ICBP-Newsletter misunderstandings about the AWI-model
- From: mweirig@AWI-Bremerhaven.DE (Marie France Weirig)
- Date: Tue, 31 Aug 1999 17:58:53 +0200
in the latest IGBP GAIM newsletter, James and Jean-Claude presented
some OCMIP-CFC results. There, it was written that
"The AWI-model is an adjoint model, which uses hydrographic and
tracer data in an inverse fashion to compute a mean annual ocean
The other models are of the more forward type"
This is not true.
To prevent further misunderstandings and to clear up things I will
briefly what our model really is doing.
First of all, we compute CFC concentrations like anybody else in a
The model we use to perform the OCMIP-simulations is neither doing any
nor "inverse" calculations.
We calculate OCMIP-tracers with a stationary current field which was
originally established using the adjoint technique. Data of
alkalinity, PO4, CO2, O2, SiO2, and NO3 were used to determine the
NO OTHER TRACER DATA were involved, which means that the velocity field
has never been adjusted in order to reproduce CFC data.
This current field is NOT changed during OCMIP simulations.
The CFC-simulations are calculated strictly forward using the flow
from INDEPENDENT measurements (and so any future OCMIP experiments will
The very good results could not be expected because there is absolutely
towards measured CFC-distributions.
I hope things are a bit clearer now.
Alfred Wegener Institute for Polar and Marine Research
P.O. Box: 12 01 61
Phone: (49) (0)471-4831-367
Fax: (49) (0)471-4831-149