Re: hi, want to ask some questions about the MJO scripts in NCL.

Hi, Dennis,
I read the Wheeler multivariate EOF paper which Waliser 2009 refer to.
As the documentation says, the script is very likely to work, although
the methods are different. Thank you very much!

2010/4/6 Dennis Shea <shea@ucar.edu>:
> As noted in the documentation at the top of:
>
>     http://www.ncl.ucar.edu/Applications/mjoclivar.shtml
>
> The "MJO Clivar" page follows the diagnostics peoposed
> in the reference below.
>
> "The US-CLIVAR MJO working group has developed diagnostics for
> objectively evaluating the MJO. The  official US-CLIVAR MJO diagnostics
> website  provides data, C-shell scripts, fortran code and GrADS scripts
> which implement and display all the suggested diagnostics. The NCL
> examples presented below perform many of the suggested diagnostics."
>
> Reference
>
>        MJO Simulation Diagnostics
>        Waliser et al.
>        2009, J. Clim.,  22: 3006-3030
>        DOI: 10.1175/2008JCLI2731.1
>
>
>
> On 4/5/10 8:01 PM, Xie Xin wrote:
>> hi,
>>
>> I am using the MJO scripts in NCL to see some MJO results. When I come
>> to the multivariate EOF for MJO, it seems a little different from the
>> Wheeler 2004 and Lo 1999 paper. In the paper it suggests that
>> "seasonal cycle should be removed by subtracting from each grid point
>> the time mean and first three harmonics of the annual cycle" and then
>> the inter-annual  variability associated with ENSO should also be
>> removed by first subtraction of variability that is linearly related
>> to a measure of ENSO in SST and trends, a 120-day mean of previous 120
>> days is subtracted. However, in the script of NCL I can only see the
>> band pass filter of the anomlies is applied. I do not know whether
>> this conforms to to the method of the original papers. And I need your
>> help about this. Is the script in NCL OK for MJO diagnostics? Thank
>> you very much!
>>
>> Best regards,
>>
>> Xin Xie
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Received on Mon Apr 5 20:49:39 2010