回复： how to get seasonal time series?

[dongdong]

Hi Manik,
Thank you for your reply!  But, what I need is a JJA series (range from 1958 to 2000), not a climatological variable. I am sorry if i did't make myself clearly.

I found a letter simily to my question, and Charles Seman suggested to write out the results to a GrADS fwrite file. I tried, but the fwrite variable isn't the same as what I defined. 

I attached my files. These descriptions are:
form.vint.WaterFlux.gs    To define waterflux and write out to GRADS fwrite file
fuq.vint.ctl                      To open the fwrite file in grads
define.fuq.gif                   horizontal water flux which I drawed after defining it
fwirte.fuq.gif                    horizontal water flux but form fwite file
grads_process.txt           commands I issued in grads

Can anyone help me finding the problems? Thanks in advance.

PS. my work here is checking whether my fwrite variables are the same as what i defined. I haven't calculated JJA mean here. I will do that after solving this problem.

Best Regards
dongdong


----- 原始邮件 ----
发件人： Manik Bali <manik at cdac.in>
收件人： dongdong <happydong365 at YAHOO.COM.CN>
已发送： 2006/12/1(周五), 上午7:14:15
主题： Re: how to get seasonal time series?


Hi 
You can get the seasonal cycle using. 
Say you have 600 months of data of sst 
'set t 1 12'
'define sstclim = ave(sst, t+0, t=600, 12)'
'modify sstclim seasonal'

sstclim then becomes a seasonal variable having 12 time steps ( jan...dev)
Later on you can take average of JJA as ave(sstclim,t=6,t=8)
Hope this helps
Manik




On Thu, Nov 30, 2006, dongdong <happydong365 at YAHOO.COM.CN> said:

> Hello friends,
> 
> Can you tell me how to get seasonal series from a monthly data set? I mean, The variables I have are monthly mean, from 1957.9 to 2002.8.  How can I extract JJA datasets, and get a summer mean time series from 1958 to 2000?
> 
> Any suggestion will be appreciated! Thank you !
> 
> 
> 
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