[ncl-talk] sub: EOF_ts

Adam Phillips asphilli at ucar.edu
Fri May 27 16:40:31 MDT 2016

Please do not post the same question multiple times to the email list. If
your question goes unanswered it likely means that no-one on ncl-talk knows
the answer to the question you posed.

Again, the output from eofunc_ts (principle component timeseries) is of the
units of the original field. Thus, if you pass air temperature in degrees C
into eofunc and then pass the output (normalized EOFs) to eofunc_ts the
output principal component (PC) timeseries will be in units of degrees C,
while the output EOFs from eofunc will be unitless. Note that the range of
PC values will likely not match the range of values of your original input
air temperature. You can multiply the principal component timeseries by the
EOFs to get the pattern for that particular PC value in the original units.

I cannot comment on why eof_5 is normalizing the PC by dividing by the sum
of the areal weights. Perhaps someone else can do so.

The normalizing of the PC that I spoke about in my previous email is shown
in example #4 here:

Hope that helps. If not, as always please respond to the ncl-talk email

On Fri, May 27, 2016 at 12:29 PM, Adv <advita6 at gmail.com> wrote:

> Hi,
> http://www.ncl.ucar.edu/Applications/Scripts/eof_5.ncl
> In this example  normalised time series with unit m. Could someone help me
> to interpret? Generally, normalised values are unitless.
>   Thank you,

Adam Phillips
Associate Scientist,  Climate and Global Dynamics Laboratory, NCAR
www.cgd.ucar.edu/staff/asphilli/   303-497-1726

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20160527/95b9a20e/attachment.html 

More information about the ncl-talk mailing list