[RegCNET] Questions about CCSM3 results as RegCM input

[Dennis Shea]

The "community liason" for Climate Change
asked me to forward his comments.

Good luck
======================================================
Dennis J. Shea                  tel: 303-497-1361    |
Climate Analysis Section                             |
Climate & Global Dynamics Div.                       |
National Center for Atmospheric Research             |
Boulder, CO  80307                                   |
USA                        email: shea 'at' ucar.edu |
======================================================


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From: Gary Strand <strandwg at ucar.edu>
Subject: Re: [RegCNET] Questions about CCSM3 results as RegCM input
Date: Sat, 22 Oct 2005 11:39:17 -0600
To: Dennis Shea <shea at cgd.ucar.edu>


(Dennis, could you pass this along to Xunqiang Bi? I don't have his 
email addy and there's no registration by that name on ESG. Thanks!)

On 22 Oct 2005, at 08:42, Dennis Shea wrote:
> I am sorry that I told a wrong information for the time of downloading 
> ESG datasets, actually it's less than 10 minutes for most GCM (I took 
> several hours because of downloading the monthly Tas of all GCMs').
>
> As for the 6 hourly 3D fields, I checked yesterday and found that 
> there is none of 6 hourly datasets at LLNL ftp address.

The 6-hourly data will only be available via ESG, not from LLNL ftp. 
The volume is simply too large.

> You are right, for the window size datasets, I mean special region, 
> like for Europe, it's enough if we just take [50W, 90E; 0, 80N] window 
> datasets.
>
> There are quite some RegCM3 users interested in using CCSM3 IPCC AR4
> fields for downscaling, is there a place for them have those datasets
> (except the NCAR Mass Store) ?

All the 6-hourly data from CCSM3 is available via ESG - it has also 
been processed into single-field files.

> I try to estimate the size of required CCSM3 IPCC AR4 here, in case
> NCAR CGD people could kindly consider the possibility for putting them 
> at one FTP server.
>
>      NCAR CCSM 3D fields size is about 256*128*26*2=1703936,

The data are 32-bit precision, so each field is actually ~3.4 MB each.

>      We need U, V, T, Q, and Z3, so is 1703936*5   =8519680,
>      So one year data size would be    8519680*1460=12438732800=12 Gb
>      30 years would be about 360 Gb (for global data).

The total volume for 30 years (I assume you mean 1970-1999 from the 
20C3M experiment) is actually ~750 GB.

All the above data is currently available via ESG, however, all of it 
is stored on the NCAR MSS, so it will take time to retrieve it and then 
download it. I will check and see if sufficient disk space is available 
on the ESG host machine to at least get the data onto disk, to save the 
time for archival reads.

Gary Strand
strandwg at ucar.edu
http://www.cgd.ucar.edu/ccr/strandwg

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