[ncl-talk] Onset dates

[Dennis Shea]

As noted, there is no NCL software that calculates (Indian) monsoon onset
and withdrawal.

Much has been written on this topic.
Please see the following. Perhaps, you could use the information to write
your own.

*Hydrological Definition of Indian Monsoon Onset and Withdrawal*
<https://doi.org/10.1175/1520-0442(2003)016%3C3200a:AHDOIM%3E2.0.CO;2>
J. Fasullo and P. J. Webster
J. Climate: 2002


*Objective Determination of the Date of Onset of Monsoon  Rainfall over
India based on Duration of Persistence
<http://www.cmmacs.ernet.in/cmmacs/Publications/resch_rep/rrcm0711.pdf>*P.
Goswami and K.C. Gouda
Research Report RR CM 0711
June 2007

*Objective determination of monsoon season onset, withdrawal, and length*
<https://doi.org/10.1029/2009JD012795>
B.I. Cook, B.M.Buckley
Climate and Dynamics (2009)

*Determination of Onset an d Withdrawal Dates of Summer Monsoon  across
India using NCEP/NCAR Re-analysis*
<https://www.tropmet.res.in/~lip/Publication/RR-pdf/RR-124.pdf>
N. Singh, A.A. Ranade
2010


*Characterizing the onset and demise of the Indian summer monsoon
<https://doi.org/10.1002/2016GL068409>*R. Noska, V. Misra
20 April 2016


*Onset and withdrawal of the large-scale South Asian monsoon:     *
<https://doi.org/10.1002/2016GL071026>
* A dynamical definition using change point detection: MONSOON ONSET*
<https://doi.org/10.1002/2016GL071026>
J.M. Walker, S. Bordoni
Geophysical Research Letters 43(22) ·
November 2016

On Fri, Nov 23, 2018 at 6:02 AM Appo derbetini <appopson4 at gmail.com> wrote:

> Hello Soma,
> I don't think that there is a tool available in NCL which can be used for
> what you are requesting.
> Here a link to a good paper where Onset and Retreat of rainy seasons are
> computed
>
> https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016JD025428
>
>
> Cheers
>
> Le jeu. 22 nov. 2018 à 21:46, Soma Roy <somaroy892 at gmail.com> a écrit :
>
>> Hello,
>> Is there any technique available in ncl to calculate *onset* and
>> *withdrawal* dates as *Julian* *days* (in spatial domain) for individual
>> years?
>>
>> I am using daily gridded dataset over Indian region.
>>
>> Please kindly inform me the above.
>>
>> Thanking you,
>> Soma
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