[gradsusr] gradsusr Digest, Vol 69, Issue 3
Ramchandra Karki
rammetro at hotmail.com
Tue Nov 3 05:23:07 EST 2015
Dear Rupak sirThank you very much .
Regards
Ramchandra Karki
> From: gradsusr-request at gradsusr.org
> Subject: gradsusr Digest, Vol 69, Issue 3
> To: gradsusr at gradsusr.org
> Date: Mon, 2 Nov 2015 20:53:25 -0500
>
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> Today's Topics:
>
> 1. Need Help for specific command (MD ABDUS SATTAR)
> 2. Re: Need Help for specific command (Rashed Mahmood)
> 3. Re: monthly calculation from daily data (Rupak Rajbhandari)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 3 Nov 2015 11:52:43 +1100
> From: MD ABDUS SATTAR <md-abdus.sattar at students.mq.edu.au>
> Subject: [gradsusr] Need Help for specific command
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> <CAKnWhdkN7VebhGCP36bO9AEKNqHmCTOiEreduj4T+f9sQZW2oA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Dear Team
> I was trying to calculate year by year time series from monthly mean SST
> data by using following formula:
>
> [image: Inline image 1]
> Where, N3 and N4 denote Nino3 and Nino4 indices respectively. I would like
> to calculate NCT and NWP for a specific year, for instance, 1997 (January
> to December). My question is how can I define "?
>
> value" in GrADS so that it can use the value of 2/5 or 0 automatically? If
> anybody could help me, it would be great.
>
> I look forward to your message.
>
> Best regards
> Abdus
> --
> Md. Abdus Sattar
> PhD Student
> Department of Environmental Sciences
> Level 2, Australian Hearing Hub Building
>
> Faculty of Science and Engineering
> Macquarie University
> NSW 2109 Australia
>
>
> Cell: +61404400401
> Email: md-abdus.sattar at students.mq.edu.au
>
> *AND*
>
> Assistant Professor
> Department of Disaster Risk Management (DRM)
> Faculty of Disaster Management
> Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh
>
> Cell: +8801716851612
> Email: abdus.sattar at pstu.ac.bd
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> ------------------------------
>
> Message: 2
> Date: Mon, 2 Nov 2015 17:27:23 -0800
> From: Rashed Mahmood <rashidcomsis at gmail.com>
> Subject: Re: [gradsusr] Need Help for specific command
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> <CAOmfQPpxpOH-Deh1hXx3b-6jRP55zpKSw2EEymxCAUWsOrnMXw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> It should be simple using if else statement.
> Untested:
>
> prod = N3*N4
>
> if ( prod > 0)
> alpha = 0.4
> else
> alpha = 0
> endif
>
> Nct = N3-alpha*N4
> Nwp = N4-alpha*N3
>
> hope that helps
>
>
>
> On Mon, Nov 2, 2015 at 4:52 PM, MD ABDUS SATTAR <
> md-abdus.sattar at students.mq.edu.au> wrote:
>
> > Dear Team
> > I was trying to calculate year by year time series from monthly mean SST
> > data by using following formula:
> >
> > [image: Inline image 1]
> > Where, N3 and N4 denote Nino3 and Nino4 indices respectively. I would like
> > to calculate NCT and NWP for a specific year, for instance, 1997 (January
> > to December). My question is how can I define "?
> >
> > value" in GrADS so that it can use the value of 2/5 or 0 automatically? If
> > anybody could help me, it would be great.
> >
> > I look forward to your message.
> >
> > Best regards
> > Abdus
> > --
> > Md. Abdus Sattar
> > PhD Student
> > Department of Environmental Sciences
> > Level 2, Australian Hearing Hub Building
> >
> > Faculty of Science and Engineering
> > Macquarie University
> > NSW 2109 Australia
> >
> >
> > Cell: +61404400401
> > Email: md-abdus.sattar at students.mq.edu.au
> >
> > *AND*
> >
> > Assistant Professor
> > Department of Disaster Risk Management (DRM)
> > Faculty of Disaster Management
> > Patuakhali Science and Technology University, Dumki, Patuakhali, Bangladesh
> >
> > Cell: +8801716851612
> > Email: abdus.sattar at pstu.ac.bd
> >
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> >
> >
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> ------------------------------
>
> Message: 3
> Date: Tue, 3 Nov 2015 07:39:01 +0545
> From: Rupak Rajbhandari <rupak.rajbhandari at gmail.com>
> Subject: Re: [gradsusr] monthly calculation from daily data
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> <CAPUBxUQOUg_GTQJ1CE06yz5+xr7n9upYpURt0eY_=2gWFuZCrw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Ramchandra,
>
> To answer your first question, you will need to develop a script to
> calculate each months total for every year. Hard coding would be something
> like;
>
> define jan=sum(precip,t=1,t=31)
> define feb=sum(precip,t=32,t=59)
> define mar=sum(precip,t=60,t=90)
> ....
>
> Next year data i.e. 1952 jan 1st starts at t=366 and continues so on (you
> must have already known). Now if you can put this kind of commands in a
> loop then you have it. Eventually, if you want to build a climatology from
> the 57 year of data, I suggest you create monthly binary file and work on
> it. Daily rainfall data is useful only to study the extremes such as your
> next two questions.
>
> Your second question about the number of rainy days - I presume number of
> rainy days in a year. Again you need a separate program which counts days
> when condition is fulfilled. In my case, I wrote o short program in Fortran
> which calculates number of days over each grid, then I used GrADS to read
> this file to display the number of rainy days.
>
> Third question;
> In order to calculate percentile, first you need to SORT the data and find
> the values for different percentile. Once you have the threshold value, you
> can follow the same procedure for finding number of rainy days and work on.
>
> So the way forward is not that simple. For more queries, you can contact me
> at my office.
>
> -rupak
>
>
>
>
> On Sun, Nov 1, 2015 at 11:07 PM, Ramchandra Karki <rammetro at hotmail.com>
> wrote:
>
> > Hi all
> > I am beginner to grads and I want to calculate the following from these
> > data set
> > i have *daily *Aphrodite data set with control file in this format
> >
> > dset F:\005deg\APHRO_NPL_005deg_V1003R1.%y4
> > *
> > undef -99.9
> > options little_endian template
> > title Averaged Daily Precipitation Value
> > *
> > xdef 190 linear 79.525 0.05
> > ydef 100 linear 26.025 0.05
> > zdef 1 levels 1
> > tdef 20819 linear 01jan1951 1dy
> > *
> > vars 3
> > precip 1 00 daily precipitation analysis (mm/day)
> > flgcnt 1 00 if 1, offline (individual country's) gauge(s) exists
> > flggts 1 00 if 1, online (GTS-based) gauge(s) exists
> > endvars
> >
> >
> > 1. *how can i calculate the monthly rainfall total for each year from
> > 1951 to 2009 using some loops or easier way*
> > 2. how can i get rainy days (count of days >1mm rainfall)
> > 3. how can i get percentile 99 for 1971 to 2000 and then days with
> > count > 99 percentile
> >
> >
> >
> >
> >
> >
> > *RegardsRamchandra KarkiDepartment of Hydrology and Meteorology, Nepal*
> >
> > _______________________________________________
> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> >
> >
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> End of gradsusr Digest, Vol 69, Issue 3
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