[NARCCAP-discuss] HRM3-GFDL future time data

[Seth McGinnis]

Hi Kelli,

The CCSM, CGCM3, and GFDL GCMs use a 365-day calendar, which doesn't
have leap years.  There are 17 leap years between 1968 and 2038, so
Excel's calculation of the date (which uses a standard calendar that
*does* have leap years) is off by 17 days.

The starting date is really 2038-01-01.  Note that the ending dates are
actually 2070-12-31, because there are 8 leap years between 2038 and
2070, so the time span is actually 8 days shorter than you'd expect if
you used a standard calendar.

(The situation with the HadCM3-driven runs is even worse, because HadCM3
uses a 360-day calendar.)

Details and more information, including some important notes about
ragged end points and the spin-up period, are available on our website:

http://narccap.ucar.edu/about/time-periods.html

Cheers,

--Seth


On 4/29/2014 5:03 PM, Walters, Kelli Michelle wrote:
> Hi Seth and NARCCAP users,
> 
> I am using the HRM3-GFDL future data (precip) and noticed that the future
> dataset seems to start on 12/15/2037 instead of 01/01/2038 like all the
> rest of the models. The other models I am using state that the time starts
> counting from 1/1/2038, but the HRM3-GFDL model says that it starts at
> 01/01/1968 (like for the current data). When I add the time value to that
> start date, the data begins at 12/15/2037.
> 
> If I bump the data to begin on 01/01/2038 like the other models, then it
> ends on 12/23/2070 like the other models as well, which leads me to believe
> the starting date is just off.
> 
> Does anyone know if the date information was somehow shifted or should it
> really be starting on 12/15/2037? Or am I maybe calculating something wrong
> with the dates? I am just using excel to add the date value (ex. 25551) to
> the starting date.
> 
> Any help or information is appreciated.
> Thank you,
> Kelli
> 
> --
> *Kelli Walters, *EIT
> M.S. Candidate
> Civil Engineering | Water Resources
> Oregon State University
> Office: Owen 233
> Email: waltersk at onid.oregonstate.edu
> Cell: 503.869.5118
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