<div dir="ltr"><div><div><div>Umm, your semantics are confusing (to me).<br><br></div>"find" ==> reconstruct?<br><br></div>[1] <br>Generally, geophysical based EOFs are quite "red" in nature. Most 'power' (variance) is in the lowest few modes. For sure, 5 or fewer. <br><br>[2]<br>Further, *each* EOF should be significantly ("distinctly") separated from the surrounding EOFs to be used for reconstruction of 'significant' patterns. See:<br><br> <a href="http://www.ncl.ucar.edu/Document/Functions/Contributed/eofunc_north.shtml" target="_blank">http://www.ncl.ucar.edu/<wbr>Document/Functions/<wbr>Contributed/eofunc_north.shtml</a><br><br></div><div>If, say, your data show 2 or 3 distinct EOFs then the 27/28 other EOFs that you calculated are artifacts of sampling. <br><br></div><div>[3] <br>NOTE : *statistical-significance" is independent of "physical-significance" . One does not imply the other. <br>You should sum using <b>only</b> the contributions of the significant EOFs. <br><br><br><br></div><div><br></div><div><br></div><div><br></div><br><div><div><br><div><div><br></div></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Apr 3, 2018 at 3:36 AM, Tobias Kleine <span dir="ltr"><<a href="mailto:tobias.kleine@gmx.net" target="_blank">tobias.kleine@gmx.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<font size="-2"><font face="Arial">Hi there,<br>
<br>
I am using eofunc to calculate the first 30 EOFs of detrended
SST anomalies. I add these individual EOFs up to a "combined"
EOF including a weighting, like so: eof_comb =
dim_sum_n(eof*weights,0). This is pseudo-code obviously.<br>
<br>
I then try to find with which temporal variability the new
combined EOF is present in my original SST anomalies: <br>
pc_new = enfunc_ts(sst_anom,eof_comb,<wbr>False), where sst_anom is
lat x lon x time and eof_comb is evn x lat x lon. <br>
<br>
My question is, since I can't find source code for eofunc_ts, is
the routine capable of "finding" my combined EOF in the original
data and gives me the correct PC or do I need to expect wrong
results because I meddled with the EOFs?<br>
<br>
Regards,<br>
Tobias<br>
</font></font>
</div>
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