<div dir="ltr"><div dir="ltr"><div>[1] DATA: The years have changed but the files are available at:<br></div><div><br></div><div><div dir="ltr"><div dir="ltr"><div><br></div><div>ftp <a href="http://ftp.cgd.ucar.edu" target="_blank">ftp.cgd.ucar.edu</a></div><div>anonymous</div><div>your_email</div><div>cd pub/shea/MJO</div><div>mget * .<br></div><div>quit</div><div>==========</div><div><div><br></div><div>Note: The file names have changed slightly from those used in the examples. For example:<br></div><div><pre><a href="http://olr.day.anomalies.1980-2005.nc" target="_blank">olr.day.anomalies.1980-2005.nc</a> ==> <a href="http://olr.day.anomalies.1980-2011.nc" target="_blank">olr.day.anomalies.1980-2011.nc</a></pre></div></div></div><div>Perhaps, some minor changes in the graphic resources will be needed. <br></div><div dir="ltr">==========</div><div dir="ltr">/ftp/pub/shea/MJO<br>-rw-r--r-- 1 shea cgdcas 458055500 Jan 11 10:08 <a href="http://MODEL.SST.HAD187001-198110.OI198111-201703.nc" target="_blank">MODEL.SST.HAD187001-198110.OI198111-201703.nc</a><br>-rw-r--r-- 1 shea cgdcas 30699392 Jan 11 10:18 <a href="http://OLR.12hr_2yrs.wheeler.nc" target="_blank">OLR.12hr_2yrs.wheeler.nc</a><br>-rw-r--r-- 1 shea cgdcas 858482293 Jan 11 09:40 olr.day.anomalies.1979-2011.nc.gz<br>-rw-r--r-- 1 shea cgdcas 304335976 Jan 11 10:10 <a href="http://olr.day.mean.nc" target="_blank">olr.day.mean.nc</a><br>-rw-r--r-- 1 shea cgdcas 615513004 Jan 11 10:24 <a href="http://pregpcp19962008.daily.nc" target="_blank">pregpcp19962008.daily.nc</a><br>-rw-r--r-- 1 shea cgdcas 350655700 Jan 11 10:23 <a href="http://TRMM.200006-200109.thin.nc" target="_blank">TRMM.200006-200109.thin.nc</a><br>-rw-r--r-- 1 shea cgdcas 929887809 Jan 11 09:41 uwnd.day.anomalies.1979-2011.200.nc.gz<br>-rw-r--r-- 1 shea cgdcas 934253770 Jan 11 09:41 uwnd.day.anomalies.1979-2011.850.nc.gz<br>-rw-r--r-- 1 shea cgdcas 939714739 Jan 11 09:41 vwnd.day.anomalies.1979-2011.200.nc.gz<br>-rw-r--r-- 1 shea cgdcas 939092767 Jan 11 09:41 vwnd.day.anomalies.1979-2011.850.nc.gz<br></div>====</div><div>The *gz files will have to be unpacked:</div><div> %> gzip -d *nc.gz</div><div>====</div><div><br></div><div>FILTERS:</div><div> <a href="http://www.ncl.ucar.edu/Applications/filter.shtml"><b>http://www.ncl.ucar.edu/Applications/filter.shtml</b></a></div><div><br></div><div>There are several examples of Butterworth filters. <br></div><div>These included comaprison with Lanczos filters.</div><div><br></div><div>I do not know why: ".. exchange values of ca and cb .." does not change the results.</div><div>I don't have time to look right now. <br></div><div>Perhaps the interface between NCL and the ubderlying fortran code does an exvhange.</div><div><br></div><div>re: making the band pass into a low-pass filter. Pergform xome comparisons withe a Lanczos low pass filter.</div><div><br></div><div>Good Luck<br></div><div><br></div></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Sat, Jan 12, 2019 at 8:27 PM 15295538792 <<a href="mailto:15295538792@163.com">15295538792@163.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div style="border-width:0px;font-size:10.5pt;font-family:微软雅黑;color:rgb(0,0,0);margin:12px;line-height:1.5"><u></u>
<div>Dear NCL experts,</div>
<div> </div>
<div>I'm writing to ask if you could send me the data file named
"<a href="http://uwnd.day.850.anomalies.1980-2005.nc" target="_blank">uwnd.day.850.anomalies.1980-2005.nc</a>" which is used in the script
"bfband_2.ncl". I can't find it in the online data files. In addition, I'd like
to consult you about the function "bw_bandpass_filter" which applies a
Butterworth bandpass filter to time series. The online documentation says that
the cut-off paramaters ca and cb of this function should meet a condition of
ca>cb (fcb>fca). However, when I exchanged the values of ca and cb, the
results remained the same. How could this happen? In fact, I want to use this
bandpass filter as a low pass filter which need only one cut-off frequency. So
which parameter should I set to arbitrarily large (ca or cb)? Is there anything
wrong in my script? Please help. Thanking in anticipation. (PS: Input and
output data files as well as ncl script I used has been attached to this
email.)</div>
<div> </div>
<div> </div>
<div>Sincerely,<br>Shouli Xuan<br><a href="mailto:Email%3A15295538792@163.com" target="_blank">Email:15295538792@163.com</a></div>
<div> </div>
<div style="font-size:10pt;font-family:Verdana;color:rgb(192,192,192)">
<div align="left">2019-01-13</div>
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<span id="gmail-m_5506818083859252814_FlashSignName">15295538792</span> </div><u></u></div>_______________________________________________<br>
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