[gradsusr] Confirmation of TCORR command
James T. Potemra
jimp at hawaii.edu
Thu Sep 24 15:10:55 EDT 2015
Hi Andrew,
Actually, if you can redefine the longitudes in your control file from
(-180:180) to (0:360)
that would solve the dateline issue. In this case you could have
aave(sstanom,lon=160,lon=210....
to resolve to 160E to 150W.
In order to go beyond 360 (e.g., lon=340,lon=390), your data set has to
be continuous in
the sense that 361 (or whatever) is a legitimate extension. For
example, if you start at 0
and go to 359 increment by 1, the next point would be 360 (0), then 361
(1), etc. To check
you can try make a global plot of some variable, and set the longitude
range from 0 to 720;
in this case you should either see a twice-global plot.
Jim
On 9/24/15 12:24 AM, Andrew Friedman wrote:
> Thank you for these clarifications, Jim.
>
> To follow up:
> To use your suggested option (2), "define nino4 =
> aave(sstanom,lon=340,lon=390,lat=-5,lat=5)"
>
> Would I first need to redefine the longitude values
> 'set lon 0 360' ?
>
> Best,
> Andrew
>
> On Thu, Sep 24, 2015 at 4:45 AM, James T. Potemra <jimp at hawaii.edu
> <mailto:jimp at hawaii.edu>> wrote:
>
> Hi Abdus/Andrew,
>
> I'd be cautious of your nino4 as defined. I presume your data are
> defined -180 to 180, where eastern longitudes are 0 to 180 and
> western longitudes are -180 to 0. In your line:
>
> "define nino4=aave(sstanom,lon=-150,lon=160,lat=-5,lat=5)”
>
> the longitudes are in fact ascending (-150 is less than 160),
> however I believe this will create a mean from 150W eastward all
> the way around to 160E (again, assuming your longitudes are
> defined -180 to 180), a mean over 310 longitudes. Instead you
> want 160E to 150E, or a mean over 50 longitudes. I further think
> Andrew's suggestion
>
> "define nino4=aave(sstanom,lon=160,lon=-150,lat=-5,lat=5)”
>
> will give an operation error (min lon > max lon).
>
> Instead you could try either:
>
> 1. define two different boxes across the dateline:
> define nino4a = aave(sstanom,lon=160,lon=180,lat=-5,lat=5)
> define nino4b = aave(sstanom,lon=-180,lon=-150,lat=-5,lat=5)
> define nino4 = ( 20 * nino4a + 30 * nino4b ) / 50.0
>
> 2. if the file is global and continuous, you might be able to use
> define nino4 = aave(sstanom,lon=340,lon=390,lat=-5,lat=5)
>
> Jim
>
>
> On 9/22/15 4:41 PM, MD ABDUS SATTAR wrote:
>> Hi Andrew
>> Thanks!
>>
>> On Wed, Sep 23, 2015 at 5:58 AM, Andrew Friedman
>> <andfried at gmail.com <mailto:andfried at gmail.com>> wrote:
>>
>> 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
>> <mailto: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
>> <http://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
>> <http://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 <mailto: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
>> <mailto: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
>> <http://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 <mailto: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
>> <mailto: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
>> <http://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 <tel:%2B61404400401>
>> > > > Email: md-abdus.sattar at students.mq.edu.au
>> <mailto: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 <tel:%2B8801716851612>
>> > > > Email: abdus.sattar at pstu.ac.bd
>> <mailto:abdus.sattar at pstu.ac.bd>
>> > > > _______________________________________________
>> > > > gradsusr mailing list
>> > > > gradsusr at gradsusr.org <mailto:gradsusr at gradsusr.org>
>> > > > http://gradsusr.org/mailman/listinfo/gradsusr
>> > >
>> > >
>> > > _______________________________________________
>> > > gradsusr mailing list
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>> > > http://gradsusr.org/mailman/listinfo/gradsusr
>> > >
>> > >
>> > >
>> > > --
>> > > 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 <tel:%2B61404400401>
>> > > Email: md-abdus.sattar at students.mq.edu.au
>> <mailto: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 <tel:%2B8801716851612>
>> > > Email: abdus.sattar at pstu.ac.bd
>> <mailto:abdus.sattar at pstu.ac.bd>
>> > > _______________________________________________
>> > > gradsusr mailing list
>> > > gradsusr at gradsusr.org <mailto:gradsusr at gradsusr.org>
>> > > http://gradsusr.org/mailman/listinfo/gradsusr
>> >
>> >
>> > _______________________________________________
>> > gradsusr mailing list
>> > gradsusr at gradsusr.org <mailto:gradsusr at gradsusr.org>
>> > http://gradsusr.org/mailman/listinfo/gradsusr
>> >
>> >
>> >
>> > --
>> > 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 <tel:%2B61404400401>
>> > Email: md-abdus.sattar at students.mq.edu.au
>> <mailto: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 <tel:%2B8801716851612>
>> > Email: abdus.sattar at pstu.ac.bd <mailto:abdus.sattar at pstu.ac.bd>
>> > _______________________________________________
>> > gradsusr mailing list
>> > gradsusr at gradsusr.org <mailto: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 <tel:%2B61404400401>
>> Email: md-abdus.sattar at students.mq.edu.au
>> <mailto: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 <tel:%2B8801716851612>
>> Email: abdus.sattar at pstu.ac.bd <mailto:abdus.sattar at pstu.ac.bd>
>>
>>
>> _______________________________________________
>> gradsusr mailing list
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>> http://gradsusr.org/mailman/listinfo/gradsusr
>
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