[RegCNET] Stagnant upper atmosphere in RegCM?

[GIORGI FILIPPO]

Dear Maurice

I would say that at the moment RegCM is not really designed to do detailed
stratosphere studies, at least in its standard configuration. The model
top is usually between 50 and 100 hPa (you should check what you are using
as model top) and in its standard configuration there are only a few
levels above 200 hPa.

It is great if you can test the model for stratospheric studies, but in
this case you probably need to substantially change its configuration in
the upper troposphere/stratosphere, increase model top and use many more
layers.

I would be itnerested in knowing your progress on this,

cheers,   Filippo

> Colleagues,
>
> I am trying to perform some ozone transport in RegCM3.  However, ozone is
> not being transported below the upper atmosphere, even when the input data
> has downwelling.  I believe this is because the atmosphere is basically
> stagnant above 200 hPa (omega ~= 0 hPa/s).  Has anyone else worked with
> RegCM in the upper atmosphere?  Is there something hard-coded within the
> model that does this?  Or are there parameters I could change to solve the
> problem?
>
> I’ve attached a GRADS plot that demonstrates the difference between model
> input and output data for ozone.  The other plot is the difference between
> omega from the GCM and RegCM output.
>
> Many thanks for any ideas.
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