[ncl-talk] trend of SST yearly and JJAS

[Nitin Patil]

Thanks I will try.

--
Regards,
Nitin Patil

On Mon, Sep 7, 2015 at 8:23 PM, Izidine Pinto <izidinep at gmail.com> wrote:

> Hello Nitin,
>
> 1. I have plotted trend of sst/112 years (trend_yearly.ncl) and is working
> fine, *In this I have to show only the trend which is 95% significant,
> anyone knows?*
>
> - You can use several statistical tests to test the significance of the
> trend depending in your data. One of them is the Mann-Kendall
> non-parametric trend test. See
> https://www.ncl.ucar.edu/Document/Functions/Built-in/trend_manken.shtml
> for the description. Calculate the p value and if it is less than 0.05 then
> the trend is significant. You can plot the trend and then overlay with the
> p values (see https://www.ncl.ucar.edu/Applications/Scripts/overlay_5.ncl
> https://www.ncl.ucar.edu/Applications/Images/overlay_5_lg.png ).
>
> 2. I am trying to plot trend (trend_jjas.ncl) as per above but on seasonal
> basis (JJAS) but it is showing some seasonal error, Kindly let me know *how
> to compute seasonal trend JJAS (How to select JJAS per year?).*
>
>  - Without knowing what exactly the seasonal error is make it difficult to
> help.
> Or what you can do is to create a new file containing only JJAS (you can
> use cdo) and do the trend calculation using trend_yearly.ncl.
>
> If you have any further questions please respond to the ncl-talk list.
> Izidine
>
>
>
> Izidine S. Pinto
>
>
> On 7 September 2015 at 13:38, Nitin Patil <nitinpatil85 at gmail.com> wrote:
>
>> Dear NCL user's,
>>
>> 1. I have plotted trend of sst/112 years (trend_yearly.ncl) and is
>> working fine, *In this I have to show only the trend which is 95%
>> significant, anyone knows?*
>>
>> 2. I am trying to plot trend (trend_jjas.ncl) as per above but on
>> seasonal basis (JJAS) but it is showing some seasonal error, Kindly let me
>> know *how to compute seasonal trend JJAS (How to select JJAS per year?).*
>>
>> *Note:* My data file looks like: SST monthly Jan 1901 to Dec 2012.
>>
>> --
>> Regards,
>> Nitin Patil
>>
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>
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