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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Hi Sri<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">To me, your question doesn’t make a whole lot of sense, since typically the annual cycle is expressed as the long-term mean of each individual day/month/season (depending on the temporal resolution
of the data).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">I guess if you really want to keep the climatological annual mean, I can think of two ways of doing it:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo1"><span style="mso-fareast-language:EN-US">Calculate the long-term mean (over the whole dataset), remove the annual cycle using rmMonAnnCycLLT(), and then add the long-term mean back
onto the data<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">>mn = dim_avg(data)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">>anom= rmMonAnnCycLLT(data)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">>anom = anom + conform(anom,mn, (/0,1/))<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<ol style="margin-top:0cm" start="2" type="1">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l1 level1 lfo1"><span style="mso-fareast-language:EN-US">Estimate a 12-month cycle using fourier_info()., and remove that from the 12-momth harmonic from the data.<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Will<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">ncl-talk <ncl-talk-bounces@mailman.ucar.edu> on behalf of Sri nandini via ncl-talk <ncl-talk@mailman.ucar.edu><br>
<b>Reply to: </b>Sri nandini <bax8609@uni-hamburg.de><br>
<b>Date: </b>Friday, 9 April 2021 at 10:21 pm<br>
<b>To: </b>Ncl-talk <ncl-talk@ucar.edu><br>
<b>Subject: </b>[ncl-talk] remove seasonal data<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">Hello dear ncl-users,<br>
<br>
Could someone tell me if there is a function in NCL that only removes <br>
seasonal (Annual cycle) data from monthly data?<br>
<br>
The function: rmMonAnnCycLLT removes the annual cycle from monthly <br>
(number of months = 12) data and subtracts the long-term means from each <br>
month. But i do not want to get anomalies by subtracting the long term <br>
means. I only want to calculate and remove the seasonal aspect (the <br>
Annual cycle).<br>
<br>
Thanx<br>
<br>
Sri<br>
<br>
-- <br>
Dr. Sri, Nandini-Weiss<br>
Research Associate<br>
<br>
Universität Hamburg<br>
Center for Earth System Research and Sustainability (CEN)<br>
Cluster of Excellence 'Climate, Climatic Change, and Society' (CLICCS)<br>
<br>
Bundesstrasse 53, 20146 Hamburg<br>
<br>
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