[gradsusr] Confirmation of TCORR command
Andrew Friedman
andfried at gmail.com
Thu Sep 24 18:34:38 EDT 2015
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> 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> 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
>>>>> > > > _______________________________________________
>>>>> > > > gradsusr mailing list
>>>>> > > > gradsusr at gradsusr.org
>>>>> > > > http://gradsusr.org/mailman/listinfo/gradsusr
>>>>> > >
>>>>> > >
>>>>> > > _______________________________________________
>>>>> > > gradsusr mailing list
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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
>>>>> >
>>>>> >
>>>>> > _______________________________________________
>>>>> > gradsusr mailing list
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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
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> gradsusr mailing list
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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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>>>
>>>
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>>
>>
>>
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