[RegCNET] Problem in running RegCM with 2*CO2

[gaoxj at cma.gov.cn]

You cannot do 2*CO2 experiment by simply double the CO2 in RegCM, but using the normal CO2 NCEP or ERA40 re-analysis as ICBC. You get little effects of 2*CO2 by this way. 

You need the driving from a 2*CO2 GCM runs. 


  ----- Original Message ----- 
  From: guogl 
  To: regcnet ; XUNQIANG BI ; Ashraf Zakey 
  Sent: Monday, February 23, 2009 10:45 AM
  Subject: [RegCNET] Problem in running RegCM with 2*CO2


  Dear Sir
  I am doing a 2*CO2 test with RegCM3, and there are several problem:
  For example, I will double CO2 of 2006010100-20070101.
  1) There have two ways to double CO2.
      One is changing the number in  BLOCKDATA001.F directly:
  I change

  data ((cgas(i,j),i=1,6),j=1991,2049) /  ! A2 SCENARIO 
  ..........................................................
  2006.0, 382.97, 1871.4, 323.61, 269.39, 563.25  

   to

  data ((cgas(i,j),i=1,6),j=1991,2049) /  ! A2 SCENARIO 
  ..........................................................
  2006.0, 765.94, 1871.4, 323.61, 269.39, 563.25  

  The other is changing the line

         co2vmr = cgas(2,lyear)*1.e-6

                  to

                  co2vmr = cgas(2,lyear)*1.e-6 * 2.

                  in radini.F

  Are both of methods right? if right, Are their  results of two methods the  same?

  2) I have two regcm versions,one is regcm.tar.gz  and the other is regcm_beta_20080711.tar.gz .I find their BLOKDATA001.F are different.

  A:     Their values are different. for example,
  data ((cgas(i,j),i=1,6),j=1991,2049) /  ! A2 SCENARIO 
  ..........................................................
  2006.0, 382.97, 1871.4, 323.61, 269.39, 563.25  
  in regcm.tar.gz /../Main/BLOKDATA001.F

  and 
  data ((cgas(i,j),i=1,6),j=2001,2050) /  ! A2 SCENARIO 
  ........................................................
  2006.00, 378.40,1820.60, 321.40, 269.39, 563.25, 
  in  regcm_beta_20080711.tar.gz/../Main/BLOKDATA001.F

  why?
  B:  BLOKDATA001.F contains 'A1B' '20C' 'A2' 'B1' 'B2' scenarios in regcm_beta_20080711.tar.gz/../Main/.
  I don't know what is the meaning of '20C SCENARIO'.

  C:  If I want to do a CTRL test of 2006010100-2007010100 with regcm.tar.gz, Is the default value of CO2 'A2 SCENARIO' ?

  Expect your help! Thanks!

  With Best Regards!
  Guo
  2009-02-23 

------------------------------------------------------------------------------

  guogl 


------------------------------------------------------------------------------


  _______________________________________________
  RegCNET mailing list
  RegCNET at lists.ictp.it
  https://lists.ictp.it/mailman/listinfo/regcnet
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ictp.it/pipermail/regcnet/attachments/20090223/d94c39d4/attachment.html>