[ncl-talk] sub: EOF_ts
advita6 at gmail.com
Fri May 27 18:38:18 MDT 2016
Thanks for your reply. My question is not about the normalization but about
the unit of temperature after normalisation. I resolved it.
On Fri, May 27, 2016 at 5:40 PM, Adam Phillips <asphilli at ucar.edu> wrote:
> 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:
>> 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
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