[gradsusr] Confirmation of TCORR command

Tue Sep 22 15:58:12 EDT 2015

Hi Abdus,

I think that you are setting up the anomalies correctly. However, you may have a problem with your NINO4 domain:
> "define nino4=aave(sstanom,lon=-150,lon=160,lat=-5,lat=5)”

https://climatedataguide.ucar.edu/climate-data/nino-sst-indices

In GrADS, longitudes need to be ascending.

I think that you want to reverse your longitudes so you have

"define nino4=aave(sstanom,lon=160,lon=-150,lat=-5,lat=5)” OR "define nino4=aave(sstanom,lon=160,lon=210,lat=-5,lat=5)”

Best, Andrew

> On Sep 22, 2015, at 7:57 AM, MD ABDUS SATTAR <md-abdus.sattar at students.mq.edu.au> wrote:
> 
> Dear Andrew
> Thank you very much for your previous suggestion. Now, I can prepare El Nino series as well as temporal correlation. However, I am not confident enough whether I am right or wrong. I use the following script for correlating El Nino 4 index with sea level pressure (Jan 1979 to Dec2014). Please confirm me the following command.
> "reinit"
> "sdfopen \Temp\sst7914.mnmean.v4.nc"
> "set t 1 12"
> "define avesst=ave(sst1,t+0,t=432,12)"
> "modify avesst seasonal"
> "set t 1 432"
> "define sstanom=sst1-avesst"
>  
> "define nino4=aave(sstanom,lon=-150,lon=160,lat=-5,lat=5)"
>  
> "sdfopen \Users\mq43879691\documents\test2\mslp.mon.mean.nc"
> "set lon 0 360"
> "set lat -90 90"
> "set t 1"
> "d tcorr(nino4,mslp.2,t=1,t=432)"
> 
> Output:
> <image.png>
> 
> How can perform lead or lag correlation?
> 
> Best regards
> Abdus
> 
> On Tue, Sep 15, 2015 at 6:48 AM, Andrew Friedman <andfried at gmail.com> wrote:
> Hi Abdus,
> 
> Your timeseries is static because your boundaries for ssta do not have a time-varying dimension.
> 
> There are different commands, depending on what you’re trying to do.
> 
> Are you trying to create a monthly ssta climatology? If so, check out the instructions for the command ‘modify’: http://www.iges.org/grads/gadoc/gradcomdmodify.html
> 
> Or are you trying to create a running mean timeseries of ssta? In that case, try something like ssta=ave(sst,t-11,t+0).
> 
> Best,
> Andrew
> 
> 
> On Sep 13, 2015, at 8:01 AM, MD ABDUS SATTAR <md-abdus.sattar at students.mq.edu.au> wrote:
> 
> > Hi Andrew
> > I was trying to set tloop, but still facing difficulties. I prepared the script as:
> > "reinit"
> > "sdfopen \Users\mq43879691\documents\test2\sst.mnmean.v4.nc"
> > "set t 1 1937"
> > "define ssta=ave(sst,t=1501,t=1933,12)"
> >
> > "set lat 25"
> > "set lon 50"
> > "set lev 0"
> > "set t 1501 1933"
> >
> >
> > "d tloop(aave(ssta,lon=100,lon=170,lat=-5,lat=5))"
> >
> > "d tloop(aave(sst,lon=100,lon=170,lat=-5,lat=5))"
> >
> > I can display time series of El Nino by using sst value ("d tloop(aave(sst,lon=100,lon=170,lat=-5,lat=5))"). However, I would like use to ssta ("d tloop(aave(ssta,lon=100,lon=170,lat=-5,lat=5))") and when I use this the following map is found. Could you please suggest me in this regards?
> >
> >
> >
> > <image.png>
> >
> >
> > Thanking you
> >
> > Abdus
> >
> >
> >
> > On Fri, Sep 11, 2015 at 4:18 PM, Andrew Friedman <andfried at gmail.com> wrote:
> > Hi Abdus,
> > You may need to use ‘tloop’ with aave: http://www.iges.org/grads/gadoc/gradfunctloop.html
> > Andrew
> >
> > On Sep 11, 2015, at 7:05 AM, MD ABDUS SATTAR <md-abdus.sattar at students.mq.edu.au> wrote:
> >
> > > Dear GrADS Team
> > > I am trying to calculate time series of El Nino SST anomaly in January for a specific time period.
> > >
> > > I wrote my script as:
> > >
> > > "reinit"
> > > "sdfopen \Users\mq43879691\documents\test2\sst.mnmean.v4.nc"
> > > "set lon 100"
> > > "set lat 25"
> > > "set z 1"
> > > "set t 1 600"
> > >
> > > "define ssta=ave(sst,t=1,t=600,12)"
> > >
> > > "define elnino = aave(ssta,lon=100,lon=170,lat=-5,lat=5)"
> > >
> > > "d elnino"
> > >
> > > The GrADS did not know show anything by this script. On the other hand, when I display only ssta setting lon 50 100 and lat 0 25; then it shows the ssta. Can anybody help me in this regards?
> > >
> > > I look forward to your suggestion.
> > >
> > > 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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> >
> >
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> >
> >
> >
> > --
> > 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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> 
> 
> -- 
> 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