Question on the "cd_calendar" and CRUTEM4 nc data file?

Hi, all

       Now I use NCL 6.0 on a macbook (X-Lion 10.7), and "cd_calendar" is a new function in NCL6.0.

I download two NC files (HadSST2_1850on.nc and CRUTEM4.nc) from the CRU

(http://www.cru.uea.ac.uk/cru/data/temperature/ ). When I do as follow

 " f1 = addfile (" HadSST2_1850on.nc","r")
    f2 = addfile("CRUTEM4.nc',"r")

   t1 = f1->time
   t2 = f2->t

   yyyymm1 = ut_calendar(t1,-1)
   yyyymm2 = ut_calendar(t2,-1) "

I get
" warning:ut_calendar: Invalid specification string. Missing values will be returned.
(0) HadSST2 : from 185001 to 201202
(0) CRUTEM4 : from -2147483647 to -2147483647

However, When I use the " cd_calendar" to replace the " ut_calendar" , as the following

" yyyymm1 = cd_calendar(t1,-1)
       yyyymm2 = cd_calendar(t2,-1) "
  
I get
(0) HadSST2 : from 185001 to 201202
(0) CRUTEM4 : from 184912 to 201011

We can see one month lag at the beginning between two data , which is inconsistent with the instruction
on the webpage http://www.cru.uea.ac.uk/cru/data/temperature/ . According to the webpage, both data should
start at the same time,

Thanks!

Lin

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Received on Sun Apr 8 01:11:17 2012