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 Post subject: SST in RCP 4.5
PostPosted: Mon Dec 19, 2016 3:22 pm 
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Joined: Mon Mar 07, 2016 12:54 pm
Posts: 10
Hi,
I have completed running HadGEM historical and RCP 4.5. While analyzing the historical data, the SST value is closer to the observation data. But in RCP 4.5, the value starts from 2°C which is totally wrong.I am unable to figure out what could have gone wrong. I have enclosed the sample files of historical and RCP 4.5 for your kind reference. Kindly help me on this regard.


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hadaea.pyn0c10.03236.mmax.rr8.expr.reg.pp.gz [73.28 KiB]
Downloaded 9 times
hadaaa.pyk0c10.03236.mmax.rr8.expr.reg.pp.gz [70.2 KiB]
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 Post subject: Re: SST in RCP 4.5
PostPosted: Fri Dec 23, 2016 11:19 am 
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Joined: Mon Sep 26, 2016 7:30 am
Posts: 11
Dear Geetha,
I need to consult my colleagues on this. So we will get back to you shortly.

Regards,

Saeed


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 Post subject: Re: SST in RCP 4.5
PostPosted: Sat Dec 24, 2016 5:43 am 
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Joined: Mon Mar 07, 2016 12:54 pm
Posts: 10
Ok. Thank you Saeed.


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 Post subject: Re: SST in RCP 4.5
PostPosted: Mon Jan 02, 2017 5:46 pm 
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Joined: Thu Feb 06, 2014 12:29 pm
Posts: 118
Hi Geetha,
Can you clarify if you are running PRECIS (HadRM3P) or HadGEM3-RA?

For PRECIS there was a bug in the RCP4.5 ancillaries that made them 100 times to small (as you found).

If you are in fact using PRECIS, please do this

1) Download replacement files

http://www.precisrcm.com/ANCIL/master/H ... s*_v1.*.gz

e.g.
http://www.precisrcm.com/ANCIL/master/H ... v1.2006.gz
http://www.precisrcm.com/ANCIL/master/H ... v1.2011.gz
and so on -- there are quite a few files.


2) Remove the incorrect files

Code:
cd $ANCIL_MASTER
rm HadGEM2-ES_rcp45_sst*
rm HadGEM2-ES_rcp45_seaice*

3) Copy the files downloaded from 1) into $ANCIL_MASTER

4) unzip them

Code:
gunzip *.gz


5) Replace the ancil config file

Code:
cd $UMDIR/vn4.5/ctldata/ancil_config
mv akwsl  akwsl.old
wget http://www.precisrcm.com/ANCIL/ancil_config/akwsl



You should now be able to start over downscaling RCP4.5 HadGEM2-ES with correct sst and sea ice values

Let us know if you have any more questions.

Thanks
David


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 Post subject: Re: SST in RCP 4.5
PostPosted: Tue Jan 03, 2017 2:57 pm 
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Joined: Mon Mar 07, 2016 12:54 pm
Posts: 10
Dear David,

I am running PRECIS (HadRM3P). Initially, ancillary files for HadGEM-ES 4.5 were missing in $ANCIL_MASTER directory. I have queried in precis forum with the subject entitled "Ancillary files missing while running RCP 4.5". Mr.Simon replied my query and asked me to download the ancillary files from http://www.precisrcm.com/ANCIL_PRECIS2/. Further he suggested me to replace the ancil_config file with http://www.precisrcm.com/ANCIL_PRECIS2/ ... nfig/akwsl. I have completed running the model with those modifications.

Are the ancillary files downloaded from http://www.precisrcm.com/ANCIL_PRECIS2/ wrong? Do I have to run the model from the beginning by replacing the ancillary files as suggested by you? Kindly clarify my queries.


Regards,
Geetha


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 Post subject: Re: SST in RCP 4.5
PostPosted: Fri Jan 13, 2017 2:24 pm 
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Joined: Thu Feb 06, 2014 12:29 pm
Posts: 118
Hi Geetha,

The corrected HadGEM2-ES rcp4.5 ancillaries all end in _v1. That is the key. If you followed my instructions in my previous message, you will have restarted the experiment from the beginning with a modified config file that tells PRECIS to use the repaired SSTs (all of which end in _v1) rather than the old, faulty files.

Does this answer your question?

If not, let me know
David


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