Re: climatological daily annual cycle

Please see:
    http://www.ncl.ucar.edu/Applications/climo.shtml
    Example 5

If you want to remove the 1st harmonic only, then
perform an fft and, then, reconstruct without the 1st harmonic.

On 9/1/10 9:43 AM, Sudheer Joseph wrote:
> Thank you Dennis,
> But the link of archives did not work for me,
> I did an fft of the original data and the one after removing the daily
> mean annual cycle but I observe that both annual and semi annual
> cycles are getting removed? I expected only annual cycle to be removed
> am I correct in my assumption?
> with best regards
> Sudheer
>
> On 9/1/10, Dennis Shea<shea@ucar.edu> wrote:
>> Se the ncl-talk@ucar.edu archive
>>
>> EG:
>> http://www.ncl.ucar.edu/Support/talk_archives/2010/2034.html
>>
>> The mean annual cycle will be removed from the data.
>>
>>
>> On 9/1/10 12:56 AM, Sudheer Joseph wrote:
>>>
>>> Dear Users,
>>> I am not much familiar with ncl, I would like to
>>> use the function at below link, but before that I would like to get
>>> advice on what it does to the data.
>>> what I understood it as doing is the following
>>> if I have daily sst data from
>>> 1-jan-2000 to 31-dec-2005
>>> it computes (1-jan-2000 + 1-jan-2002+1-jan-2003+ 1-jan-2004+1-jan-2005)/5
>>> and store it as 1st janclim and does the same thing for all the days for
>>> a year.
>>> am I right in my understanding?
>>>
>>> If so if I minus such a climatology from the time series of sst data
>>> from 2000 to 2005
>>> what frequencies of variability will be removed from the original data
>>> and what frequencies will be retained? Please advice?
>>>
>>> http://www.ncl.ucar.edu/Document/Functions/Contributed/clmDayTLL.shtml
>>> --
>>> with best regards
>>>
>>> Sudheer
>>>
>>> **********************************************************************************
>>> Sudheer Joseph
>>> Scientist
>>> Indian National Centre for Ocean Information Services (INCOIS)
>>> Ocean Valley, Post Box No# 21,
>>> IDA Jeedimetla P.O.
>>> Hyderabad, Ranga Reddy District - 500 055
>>> Andhra Pradesh, India.
>>> TEl:+91-40-23044600(R),Tel:+91-9440832534(Mobile)
>>> Tel:+91-40-23886047(O),Fax:+91-40-23892910(O)
>>> E-mail:sjo@rediffmail.com<mailto:E-mail%3Asjo@rediffmail.com>;
>>> sudheer.joseph@yahoo.com<mailto:sudheer.joseph@yahoo.com>;
>>> sjo@incois.gov.in<mailto:sjo@incois.gov.in>.
>>> Web- http://oppamthadathil.tripod.com
>>> --------------* ---------------
>>> "The ultimate measure of a man is
>>> not where he stands in moments of
>>> comfort and convenience, but where
>>> he stands at times of challenge and
>>> controversy."
>>> Martin Luther King, Jr.
>>> "What we have done for ourselves alone dies with us.
>>> What we have done for others and the world remains and is immortal."
>>> - Albert Pines
>>>
>>>
>>>
>>> --
>>> with best regards
>>>
>>> Sudheer
>>>
>>> **********************************************************************************
>>> Sudheer Joseph
>>> Scientist
>>> Indian National Centre for Ocean Information Services (INCOIS)
>>> Ocean Valley, Post Box No# 21,
>>> IDA Jeedimetla P.O.
>>> Hyderabad, Ranga Reddy District - 500 055
>>> Andhra Pradesh, India.
>>> TEl:+91-40-23044600(R),Tel:+91-9440832534(Mobile)
>>> Tel:+91-40-23886047(O),Fax:+91-40-23892910(O)
>>> E-mail:sjo@rediffmail.com<mailto:E-mail%3Asjo@rediffmail.com>;
>>> sudheer.joseph@yahoo.com<mailto:sudheer.joseph@yahoo.com>;
>>> sjo@incois.gov.in<mailto:sjo@incois.gov.in>.
>>> Web- http://oppamthadathil.tripod.com
>>> --------------* ---------------
>>> "The ultimate measure of a man is
>>> not where he stands in moments of
>>> comfort and convenience, but where
>>> he stands at times of challenge and
>>> controversy."
>>> Martin Luther King, Jr.
>>> "What we have done for ourselves alone dies with us.
>>> What we have done for others and the world remains and is immortal."
>>> - Albert Pines
>>>
>>>
>>>
>>> _______________________________________________
>>> ncl-talk mailing list
>>> List instructions, subscriber options, unsubscribe:
>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>
>
>
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Received on Wed Sep 1 09:52:20 2010