[gradsusr] Confirmation of TCORR command

Fri Sep 25 00:31:45 EDT 2015

Dear Andrew and Jim
I am still a bit confused for defining the El Nino regions. Shall I define
as:

"define nino34=aave(sstanom,lon=120,lon=170,lat=-5,lat=5)"
"define nino3=aave(sstanom,lon=90,lon=150,lat=-5,lat=5)"
"define ninocp (central pacific)=aave(sstanom,lon=120,lon=160,lat=-5,lat=5)"

Andrew, I have time frame of my data monthly mean from 1979/Jan(1) to
2014/Dec(432) and set as follows:
"set t 1 12"
"define avesst=ave(sst1,t+0,t=432,12)"
"modify avesst seasonal"
"set t 1 432"

Therefore, this command calculate only the Jan months average sst from
1979-2014 as our first time data is from 1979/Jan. Now I would like to
create climatology for February month. I have just changed as "define
avesst=ave(sst1,t=1,t=432,12)". But I think there is a mistake as the index
is not comparable to other sources.

Could you please clarify me in these regards?

I am really highly appreciate to your cooperation.

Regards
Abdus

On Fri, Sep 25, 2015 at 8:34 AM, Andrew Friedman <andfried at gmail.com> wrote:

> Thank you, Jim.
> -Andrew
>
>
>
> On Sep 24, 2015, at 9:10 PM, James T. Potemra <jimp at hawaii.edu> wrote:
>
> 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> 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>
>> 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> 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>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>
>>> 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>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>
>>> 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>abdus.sattar at pstu.ac.bd
>>> > > > _______________________________________________
>>> > > > gradsusr mailing list
>>> > > > gradsusr at gradsusr.org
>>> > > > http://gradsusr.org/mailman/listinfo/gradsusr
>>> > >
>>> > >
>>> > > _______________________________________________
>>> > > gradsusr mailing list
>>> > > 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
>>> > > Email: <md-abdus.sattar at students.mq.edu.au>
>>> 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>abdus.sattar at pstu.ac.bd
>>> > > _______________________________________________
>>> > > gradsusr mailing list
>>> > > gradsusr at gradsusr.org
>>> > > http://gradsusr.org/mailman/listinfo/gradsusr
>>> >
>>> >
>>> > _______________________________________________
>>> > gradsusr mailing list
>>> > 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
>>> > 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
>>>
>>>
>>> _______________________________________________
>>> gradsusr mailing list
>>> 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
>> Email: <md-abdus.sattar at students.mq.edu.au>
>> 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>abdus.sattar at pstu.ac.bd
>>
>>
>> _______________________________________________
>> gradsusr mailing listgradsusr at gradsusr.orghttp://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>>
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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
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