<div dir="ltr">Dear all,<div>I am happy to share my onset program and if someone can improve it.</div><div>It takes a 1D matrix and look for the first occurrence of an "onset date" which is define as : "<b>first time less than 3 consecutive days record more or equal than 20mm and not followed just afterward by a period of 10 consecutive dry days, a rainy days is here define as 1mm</b>" </div><div>all these values are parameters than can be changed. It was for an agricultural planting date purpose working with daily rainfall.</div><div>Ousmane</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr">On Fri, Nov 23, 2018 at 5:03 PM Soma Roy <<a href="mailto:somaroy892@gmail.com">somaroy892@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Thank you very much for sharing these information.<div dir="auto"><br></div><div dir="auto">Cheers!</div><div dir="auto">Soma</div></div><br><div class="gmail_quote"><div dir="ltr">On Fri, Nov 23, 2018, 21:24 Dennis Shea <<a href="mailto:shea@ucar.edu" target="_blank">shea@ucar.edu</a> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>As noted, there is no NCL software that calculates (Indian) monsoon onset and withdrawal.</div><div><br></div><div>Much has been written on this topic.</div><div>Please see the following. Perhaps, you could use the information to write your own.</div><div><br></div><div><a href="https://doi.org/10.1175/1520-0442(2003)016%3C3200a:AHDOIM%3E2.0.CO;2" rel="noreferrer" target="_blank"><b>Hydrological Definition of Indian Monsoon Onset and Withdrawal</b></a><br>J. Fasullo and P. J. Webster</div><div>J. Climate: 2002</div><div><br></div><div><b><a href="http://www.cmmacs.ernet.in/cmmacs/Publications/resch_rep/rrcm0711.pdf" rel="noreferrer" target="_blank">Objective Determination of the Date of Onset of Monsoon Rainfall over India based on Duration of Persistence</a><br></b>P. Goswami and K.C. Gouda <br>Research Report RR CM 0711<br>June 2007<br></div><div><br></div><div><a href="https://doi.org/10.1029/2009JD012795" rel="noreferrer" target="_blank"><b>Objective determination of monsoon season onset, withdrawal, and length</b></a><br>B.I. Cook, B.M.Buckley</div><div>Climate and Dynamics (2009)</div><div><br></div><div><a href="https://www.tropmet.res.in/~lip/Publication/RR-pdf/RR-124.pdf" rel="noreferrer" target="_blank"><b>Determination of Onset an d Withdrawal Dates of Summer Monsoon across India using NCEP/NCAR Re-analysis</b></a><br>N. Singh, A.A. Ranade<br>2010</div><div><br></div><div><b><a href="https://doi.org/10.1002/2016GL068409" rel="noreferrer" target="_blank">Characterizing the onset and demise of the Indian summer monsoon</a><br></b>R. Noska, V. Misra<br>20 April 2016</div><div><br></div><div><a href="https://doi.org/10.1002/2016GL071026" rel="noreferrer" target="_blank"><b>Onset and withdrawal of the large-scale South Asian monsoon: <br></b></a></div><div><a href="https://doi.org/10.1002/2016GL071026" rel="noreferrer" target="_blank"><b> A dynamical definition using change point detection: MONSOON ONSET</b></a></div><div>J.M. Walker, S. Bordoni</div><div>Geophysical Research Letters 43(22) · <br>November 2016 <br></div></div><br><div class="gmail_quote"><div dir="ltr">On Fri, Nov 23, 2018 at 6:02 AM Appo derbetini <<a href="mailto:appopson4@gmail.com" rel="noreferrer" target="_blank">appopson4@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div>Hello Soma,</div><div>I don't think that there is a tool available in NCL which can be used for what you are requesting.</div><div>Here a link to a good paper where Onset and Retreat of rainy seasons are computed</div><div><br></div><div><a href="https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016JD025428" rel="noreferrer" target="_blank">https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016JD025428</a></div><div><br></div><div></div><div><br></div><div>Cheers<br></div></div></div><br><div class="gmail_quote"><div dir="ltr">Le jeu. 22 nov. 2018 à 21:46, Soma Roy <<a href="mailto:somaroy892@gmail.com" rel="noreferrer" target="_blank">somaroy892@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto"><div dir="auto"><span style="font-size:12.8px;font-family:sans-serif">Hello,</span></div><span style="font-size:12.8px;font-family:sans-serif">Is there any technique available in ncl to calculate </span><b style="font-size:12.8px;font-family:sans-serif">onset</b><span style="font-size:12.8px;font-family:sans-serif"> and </span><b style="font-size:12.8px;font-family:sans-serif">withdrawal</b><span style="font-size:12.8px;font-family:sans-serif"> dates as <b>Julian</b> </span><b style="font-size:12.8px;font-family:sans-serif">days</b><span style="font-size:12.8px;font-family:sans-serif"> (in spatial domain) for individual years?</span><div dir="auto" style="font-family:sans-serif"><div dir="auto"><div dir="auto"><div dir="auto" style="font-size:12.8px"><br></div><div dir="auto" style="font-size:12.8px">I am using daily gridded dataset over Indian region.</div><div dir="auto" style="font-size:12.8px"><br></div><div dir="auto" style="font-size:12.8px">Please kindly inform me the above.</div><div dir="auto" style="font-size:12.8px"><br></div><div dir="auto" style="font-size:12.8px">Thanking you,</div><div dir="auto" style="font-size:12.8px">Soma</div></div></div></div></div>
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