[ncl-talk] month_to_season() how does it work?

[Daniel Barandiaran]

does it really do that? my reading of the documentation suggests that DJF
is just JF for all years, and similarly NDJ is just ND.
On Feb 19, 2015 8:30 AM, "Maria Gehne - NOAA Affiliate" <
maria.gehne at noaa.gov> wrote:

> Hi Erik,
>
> month_to_season gives you as many seasons as you have full years in your
> data. So if your data has 13 years then you will end up with 13 values for
> DJF with the first one only being computed for JF in the first year. The
> last december value will be ignored, because that would be the 14th season.
>
> Does that help?
>
> Maria
>
> On Thu, Feb 19, 2015 at 12:56 AM, Erik Jan Schaffernicht <
> eschaffe at uni-koeln.de> wrote:
>
>> I am not sure how month_to_season() function works for   DJF   (and NDJ
>> is probably similar).
>>
>> Say, I select "DJF"
>>
>> I take the years like this:
>> [snip]
>> iYYYY=  ind(YYYY.ge.1979 .and. YYYY.le.2003)
>> slp= ifle->slp(iYYYY,:,:)   + ...   (further steps, input from ncep slp
>> data.nc, and I flip some dimension to make it fitting to formal
>> requirements)
>> slpSeason=  month_to_season(slp, "DJF")
>> [snip]
>>
>> What does the month_to_season() exactly do?
>>
>> My understanding of 'what belongs to a season' written down looks like
>> this, if I group it by DJFseason:
>>
>> 1979-Jan and 1979-Feb
>> 1979-Dec and 1980-Jan and 1980-Feb
>> ...
>> 2002-Dec and 2003-Jan and 2003-Feb
>> 2003-Dec
>>
>> How does  month_to_season() process this?
>> It says that DJF takes only  two months?   Does it mean only two for the
>> first entry of this list, i.e. 1979-Jan 1979-Feb     but thereafter it
>> takes always three, so 1979-Dec + 1980-Jan+1980-Feb, so three months in
>> general except for one exception at the beginning?
>> Or is it always
>> 1979-Jan-Feb
>> 1980-Jan-Feb
>> 1981-Jan-Feb,   so December is skipped completely?  Then the "*D*JF" is
>> confusing!?
>>
>> And what happens to the 'lonely'  2003-Dec? It has no neighbouring
>> DJFmonths due to time range selection by years AD.  Is it skipped? Or is
>> it: "take this month and define it as a season"?
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>
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