[RegCNET] How to use the cmip6 option in RegCM5 namelist

[Graziano Giuliani]

As of today, it is apparent that a number of sites in the ESGF which 
were offering OpenDAP access through a THREDDS server have discontinued 
this method when the CMIP6 data access has been unrestricted through 
HTTP protocol. Sending a request directly to DKRZ about the OPENDAP 
service, this is what I got back from them:

On 2/26/24 18:30, Graziano Giuliani wrote:
 > The data server seems to be not operational for the OpenDAP download.
 > Are there plans to restore it into operational status?

Hi Graziano,
Short answer: no. After migration to new hard and software we are 
running a filserver only.
Thanks,
Katharina

A similar policy is apparently spreading through other servers, like 
CEDA. If the OpenDAP protocol is not anymore supported from the data 
providers, the only option is unfortunately to physically download the 
data on disk. Because ICTP does not have enough storage space to act as 
a mirror for CMIP6 data, RegCM users need to download their own data 
directly from ESGF servers.
Because the HTTP download is now unrestricted, a simple wget script or 
python using urllib works, without the need of using the complex script 
taking care of authentication, checksumming, etc. that can be had from 
the ESGF search interfaces.

I have made an example script for downloading MPI-ESM2-MR data here:

http://clima-dods.ictp.it/regcm4/cmip6/mpi_download.sh

It was nice until it was working, but probably the resource cost was 
high on the data provider side....

G.


On 17/06/24 08:26, zeinab.salah at yahoo.com wrote:
> Open
> How to use the cmip6 option in RegCM5 namelist
> #48
> zeinabsalah opened this issue 2 weeks ago · 1 comment
> Comments
> zeinabsalah commented 2 weeks ago
> Hello,
> I want to run RegCM5 using CMIP6 data from "https://esgf.ceda.ac.uk/thredds/catalog/esg_cmip6/CMIP6/ScenarioMIP/catalog.html"
> How can I use the option of cmip6 in the namelist of RegCM5? does it need to change something in the model configuration.
> I tried it but it gives an error of this file doesn't exist, but when I download the data on the local server, it works, so how can I use it?
> 
> when I run sst, I get this error:
> 
> syntax error, unexpected WORD_WORD, expecting SCAN_ATTR or SCAN_DATASET or SCAN_ERROR
> context: <html^><title>404 Not Found</title>
> 
> The namelist is attached.
> 
> Thank you in advance.
> Best regards,
> Zeinab
> 
> 
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-- 
Graziano Giuliani
Earth System Physics Section
The Abdus Salam International Centre for Theoretical Physics
Strada Costiera 11
34151 Trieste, ITALY
Phone: + 39 040 2240 360
email: ggiulian at ictp.it

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