Re: monthly mean climatology

Hi Xi,
Before posting to ncl-talk about whether a function/functionality
exists, we recommend trying 3 things:

1) Search the listing of functions, available under the top navigation
banner under Functions:
www.ncl.ucar.edu/Document/Functions/list_alpha.shtml
(keyword search for climatology)

2) Look at the example page available under the top navigation banner
under Examples->All Examples:
http://www.ncl.ucar.edu/Applications/
(search for climatology)

3) Try using the search bar in the upper right hand side of the NCL
website. Typing in "monthly climatology" returns a number of
possibilities, including the first returned option of "NCL Function
Documentation: *Climatology*
<http://www.ncl.ucar.edu/Document/Functions/climo.shtml>"
http://www.ncl.ucar.edu/Document/Functions/climo.shtml

I believe what you are looking for are any of the clmMon*** functions..
Hope that helps! Adam

On 01/23/2013 04:19 PM, Xi Chang wrote:
> Thank you for the hints. It worked fine but it just simply returned
> the values from daily to monthly /not to monthly climatology/. If
> anyone has an idea how to figure it out, i'll be really appreciate it.
>
> Xi.
>
>
> On Wed, Jan 23, 2013 at 10:22 AM, Dennis Shea <shea@ucar.edu
> <mailto:shea@ucar.edu>> wrote:
>
> There are several approaches
>
> [1] http://www.ncl.ucar.edu/Support/talk_archives/2012/1256.html
>
> [2] there is an unsupported and undocumented function in
> contributed.ncl: calculate_monthly_values
>
> It requires a time coordinate variable associated
> with the input variable 'x'. This time coordinate
> variable must be udunits compatible:
>
> "days since ...", "hours since ...", "seconds since ..."
>
> See cd_calendar and cd_inv_calendar
>
> ;---------------------------------
> ; undocumented and unsupported
> ;---------------------------------
> undef ("calculate_monthly_values")
> function calculate_monthly_values (x:numeric, arith:string,
> nDim[1]:integer, opt[1]:logical)
>
> ; calculate monthly values [avg, sum, min, max]
> ; x: numeric array of 5D or less [eg: time,lev,lat,lon]
> ; *must* have time coordinate recognized by cd_calendar
> ; if 5D [case,time,lev,lat,lon]
> ; arith: "avg" [also, "ave"], "sum","min","max" others may be
> added later
> ; nDim : scalar integer that specifies the 'time' dimension
> [generally, 0]
> ; opt : option ... not used here
> ;
> ; Sample usage: x(time,lat,lon) where time are n-hrly or daily
> values.
> ; xMonthAvg = calculate_monthly_values(x, "avg", 0, False)
> ; xMonthSum = calculate_monthly_values(x, "sum", 0, False)
> ; xMonthMin = calculate_monthly_values(x, "min", 0, False)
> ; xMonthMax = calculate_monthly_values(x, "max", 0, False)
> ;
> ; It is assumed that there will be multiple elements for the dim_avg_n
> ; calculation.
> ;
>
>
> On 1/22/13 4:32 PM, Xi Chang wrote:
>
> Hallo NCL users,
>
> does anyone has a trick how to calculate monthly mean
> climatology from
> daily dataset?
>
> Thank you for the help.
>
>
>
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-- 
______________________________________________________________
Adam Phillips                                asphilli@ucar.edu
NCAR/Climate and Global Dynamics Division       (303) 497-1726
P.O. Box 3000				
Boulder, CO 80307-3000    http://www.cgd.ucar.edu/cas/asphilli

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Received on Wed Jan 23 16:32:22 2013