[ncl-talk] ncl-talk Digest, Vol 193, Issue 21
dickson mbigi
dickson.mbigi at gmail.com
Wed Dec 11 17:43:54 MST 2019
RE: DECADAL SVD
Thanks Dennis. After getting rid from @_FillValue of filtered time
series, the decadal svd works well.
Regards
Dickson
On Thu, Dec 12, 2019 at 3:00 AM <ncl-talk-request at ucar.edu> wrote:
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> Today's Topics:
>
> 1. Re: period mean removed (Debashis Paul)
> 2. Re: How to average monthly wind direction and represent them
> as wind barbs (Kunal Dayal)
> 3. GFS interpolation (vertical and horizontal) (Ehsan Taghizadeh)
> 4. DECADAL SVD (dickson mbigi)
> 5. help in remove period mean (Debashis Paul)
> 6. Re: DECADAL SVD (Dennis Shea)
> 7. Re: How to average monthly wind direction and represent them
> as wind barbs (Dennis Shea)
> 8. Re: GFS interpolation (vertical and horizontal) (Dennis Shea)
> 9. Re: help in remove period mean (Dennis Shea)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 11 Dec 2019 11:34:22 +0530
> From: Debashis Paul <debgeo668 at gmail.com>
> To: Dennis Shea <shea at ucar.edu>
> Cc: Ncl-talk <ncl-talk at ucar.edu>
> Subject: Re: [ncl-talk] period mean removed
> Message-ID:
> <
> CAFV8iJ+9t8CYMDG4RWxPxhQBt3V8EQ+zjBLqBr2DDP0AedLaHQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Thanks a lot, sir will work accordingly.
>
> With regards,
> DP
> **************************
> *Debashis Paul*
>
> *Research Scholar, NIT-RKL*
> *Ph:+916002713628*
> *E-mail: Debgeo668 at gmail.com <Debgeo668 at gmail.com>*
>
>
> On Wed, Dec 11, 2019 at 5:04 AM Dennis Shea <shea at ucar.edu> wrote:
>
> > Please see examples:
> >
> > *http://www.ncl.ucar.edu/Applications/mjoclivar.shtml*
> > <http://www.ncl.ucar.edu/Applications/mjoclivar.shtml>
> > mjovlivar_2.ncl
> >
> > *http://www.ncl.ucar.edu/Applications/climo.shtml*
> > <http://www.ncl.ucar.edu/Applications/climo.shtml>
> > climo_5.ncl
> >
> > ===
> > You must do the work. Use the above to guide your thought.
> >
> > [1] compute climatology
> > [2] Cpmpute anomalies
> > [3] perform running means
> > [4] Compute areal averages
> >
> >
> > On Tue, Dec 10, 2019 at 6:40 AM Debashis Paul via ncl-talk <
> > ncl-talk at ucar.edu> wrote:
> >
> >> Hello NCL community,
> >> For my work, I need to do a task in which I have to
> >> calculate a 5-day running mean of daily 200-hPa velocity potential
> >> anomalies and then average it 10degS-10degN with period mean removed. Is
> >> there any function or have anyone done removal of the period mean,
> please
> >> let me know.
> >> Your help will be appreciated.
> >>
> >> With regards,
> >> DP
> >> *Debashis Paul*
> >>
> >> *Research Scholar,NIT-RKL*
> >> *Ph:+916002713628*
> >> *E-mail: Debgeo668 at gmail.com <Debgeo668 at gmail.com>*
> >> _______________________________________________
> >> ncl-talk mailing list
> >> ncl-talk at ucar.edu
> >> List instructions, subscriber options, unsubscribe:
> >> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
> >
> >
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>
> ------------------------------
>
> Message: 2
> Date: Wed, 11 Dec 2019 23:24:07 +1300
> From: Kunal Dayal <kday202 at aucklanduni.ac.nz>
> To: Ncl-talk <ncl-talk at ucar.edu>
> Subject: Re: [ncl-talk] How to average monthly wind direction and
> represent them as wind barbs
> Message-ID:
> <CAKca7rO376cPNZ4ZRxita2qD7_fEfj4mz+NX4S=
> E9qc9fiGg5g at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi,
>
> I working on mapping wind resources from WRFOUT files.
>
> I can easily plot contour maps of average wind speed for a month but I am
> unable to represent average wind direction in the form of wind barbs.
>
> The code I am using for the average wind speed contour maps is as follows:
> "
> begin
> a =
>
> addfile("/scale_wlg_persistent/filesets/project/uoa02450/wrf-topo2sstpblmix/wrfout_d03_2017-06-28_00:00:
> 00.nc","r")
> type = "pdf"
> wks = gsn_open_wks(type,"Average Wind Speed - Jul 2017")
> opts = True
> opts at MainTitle = "WIND SPEED"
> pltres = True
> mpres = True
>
> times = wrf_user_getvar(a,"times",-1)
> ntimes = dimsizes(times)
>
> u = wrf_user_getvar(a,"ua",-1)
> v = wrf_user_getvar(a,"va",-1)
> spd = (u*u + v*v)^(0.5)
> spd at description = "Wind Speed"
> spd at units = "m s-1"
>
> spd_avg = dim_avg_n(spd(0:30,:,:,:),0)
> spd_avg at description = "Average Wind Speed"
> spd_avg at units = "m s-1"
>
> res = True
> opts = res
> opts at cnFillOn = True
> opts at cnLinesOn = True
> opts at ContourParameters = (/ 0., 12., 0.5/)
> opts at gsnSpreadColorEnd = -3
> contour_spd_avg = wrf_contour(a,wks,spd_avg(0,:,:),opts)
> delete(opts)
>
> plot = wrf_map_overlays(a,wks,(/contour_spd_avg/),pltres,mpres)
>
> end
> "
> I wish to add monthly average wind direction to the same maps in the form
> of wind barbs.
>
> Appreciate your assistance and advice.
>
> Regards
> Kunal
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> ------------------------------
>
> Message: 3
> Date: Wed, 11 Dec 2019 11:42:49 +0000 (UTC)
> From: Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com>
> To: Ncl-talk <ncl-talk at ucar.edu>
> Subject: [ncl-talk] GFS interpolation (vertical and horizontal)
> Message-ID: <105133163.7794812.1576064569861 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Dears,I hope you're doing great.May I ask if anybody has a script to
> interpolate GFS (0.5 deg) on the desired station points and also the
> desired vertical level? I mean (both horizontal and vertical
> interpolation).Should I attach my script, however it faces many
> problems?I'll be thankful for any help.
> SincerelyEhsan
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>
> ------------------------------
>
> Message: 4
> Date: Wed, 11 Dec 2019 20:44:35 +0800
> From: dickson mbigi <dickson.mbigi at gmail.com>
> To: ncl-talk at ucar.edu
> Subject: [ncl-talk] DECADAL SVD
> Message-ID:
> <
> CALUZNzN-vpgK_RvCBGbOn4WVaV+FCV+db-j_PqHUCOSe+n06Jw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Dear concerned expert(s),
>
> I am running decadal SVD between rainfall and SST. The script (attached)
> works well without filtering(smoothing) but once Lanczos low pass filter is
> applied I get the following error. The problem occur in the place of
> dealing with missing values because the variable NMS1 has [1]dimensions
> and sizes . Without filtering NMS1 had [657]. As far I understand Lanczos
> filter by default replace missing values with fill value. Could be that be
> the reason and if that is the case how could I run the SVD without the
> aspect of missing values?
>
> Any help/guidance will highly be appreciated.
>
>
>
> [image: image.png]
>
> Regards,
>
> Dickson Mbigi,
>
> Institute of Atmospheric Physics,
>
> University of Chinese Academy of Sciences,
>
> Beijing, China.
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> ------------------------------
>
> Message: 5
> Date: Wed, 11 Dec 2019 20:26:55 +0530
> From: Debashis Paul <debgeo668 at gmail.com>
> To: Ncl-talk <ncl-talk at ucar.edu>
> Subject: [ncl-talk] help in remove period mean
> Message-ID:
> <
> CAFV8iJKJioZstgK2_Q1mFY-C93a_Xtnq2T_NNQZ1OujtnKMtZg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi NCL,
> This mail is in reference to the mail I have done yesterday
> regarding help in doing removal of the periodic mean. I did how I was
> advised to do by Dennis Sir, but am getting an error of coordinate
> mismatch. I have attached my ncl script, if anyone can say me where am I
> wrong or how to do remove periodic mean it will be much appreciated.
> Thanks in advance,
> With regards,
> *Debashis Paul*
>
> *Research Scholar,NIT-RKL*
> *Ph:+916002713628*
> *E-mail: Debgeo668 at gmail.com <Debgeo668 at gmail.com>*
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>
> ------------------------------
>
> Message: 6
> Date: Wed, 11 Dec 2019 10:09:16 -0700
> From: Dennis Shea <shea at ucar.edu>
> To: dickson mbigi <dickson.mbigi at gmail.com>
> Cc: Ncl-talk <ncl-talk at ucar.edu>
> Subject: Re: [ncl-talk] DECADAL SVD
> Message-ID:
> <CAOF1d_6Nv=ivZ=
> JwX-_kWKnq9yucV0n_27g2TSF7Lra35LVr7Q at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> The script would require a substantive time investment to understand it.
>
> ---
>
> *filwgts_lanczos*
> <http://www.ncl.ucar.edu/Document/Functions/Built-in/filwgts_lanczos.shtml
> >
>
>
> *---*
>
> *re: "As far I understand Lanczos filter by default replace missing values
> with fill value."*.
>
> NCL has a nice feature where upon input if a variable has a missing_value
> attribute and no _FillValue attribute, NCL will 'dynamically' add a
> _FillValue attribute. I believe that CRU datasets have both _FillValue and
> missing_value attributes so this language feature is not applied.
>
> The Lanczos filter only recognizes the _FillValue attribute.
>
> ncl 0> nwt = 9
> ncl 1> fca = 0.2
> ncl 2> ihp = 0
> ncl 3> nsigma = 1.
> ncl 4> wgt = *filwgts_lanczos* (nwt, ihp, fca, -999., nsigma)
> ncl 5> N = 120
> ncl 6> x = *random_normal*(0,5,N)
> ncl 7> xFilter = *wgt_runave* ( x, wgt, 0 )
> ncl 8> print(x+" "+xFilter)
>
> (0) 4.35164 *9.96921e+36*
> (1) 4.36462 9.96921e+36
> (2) 9.73397 9.96921e+36
> (3) 4.91265 9.96921e+36
> (4) 1.76982 1.85172
> (5) -0.634983 -0.730493
> (6) -4.29466 -0.420796
>
> [SNIP]
>
> (114) -0.780523 0.369537
> (115) -5.00307 -1.90461
> (116) 3.39464 *9.96921e+36*
> (117) -5.93985 9.96921e+36
> (118) -1.86471 9.96921e+36
> (119) -2.42371 9.96921e+36
>
> So the beginning and ending (nwgt/2=4) of the filtered series are padded
> with _FillValue.
>
> Since NCL's SVD does not allow _FillValue, you must input just the temporal
> segment that has no _FillValue.
>
> ===========
>
> *PLEASE NOTE: * Cherry (1996) discusses Singular Value Decomposition (SVD)
> and Canonical Correlation Analysis (CCA). Cherry's summary comment is:
> "Both methods have a high potential to produce spurious spatial patterns.
> Caution is always called for in interpreting results from either method."
> Newman and Sardeshmukh (1995) came to a similar conclusion in their paper
> which focused on SVD: "These results suggest that any physical
> interpretation of SVD pairs may be unjustified."
>
> *REFERENCES:*
>
> Cherry, S. (1996): *Singular Value Decomposition Analysis and
> Canonical Correlation Analysis*
> <https://doi.org/10.1175/1520-0442(1996)009<2003:SVDAAC>2.0.CO;2>.
> J. Climate: pp 2003-2009.
>
> Newman, M. and Sardeshmukh, P.D. (1995): *A Caveat Concerning Singular
> Value Decomposition*
> <https://doi.org/10.1175/1520-0442(1995)008<0352:ACCSVD>2.0.CO;2>
> J. Climate: pp 352-360.
>
>
> On Wed, Dec 11, 2019 at 5:44 AM dickson mbigi via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
> > Dear concerned expert(s),
> >
> > I am running decadal SVD between rainfall and SST. The script (attached)
> > works well without filtering(smoothing) but once Lanczos low pass filter
> is
> > applied I get the following error. The problem occur in the place of
> > dealing with missing values because the variable NMS1 has [1]dimensions
> > and sizes . Without filtering NMS1 had [657]. As far I understand
> Lanczos
> > filter by default replace missing values with fill value. Could be that
> be
> > the reason and if that is the case how could I run the SVD without the
> > aspect of missing values?
> >
> > Any help/guidance will highly be appreciated.
> >
> >
> >
> > [image: image.png]
> >
> > Regards,
> >
> > Dickson Mbigi,
> >
> > Institute of Atmospheric Physics,
> >
> > University of Chinese Academy of Sciences,
> >
> > Beijing, China.
> > _______________________________________________
> > ncl-talk mailing list
> > ncl-talk at ucar.edu
> > List instructions, subscriber options, unsubscribe:
> > http://mailman.ucar.edu/mailman/listinfo/ncl-talk
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>
> ------------------------------
>
> Message: 7
> Date: Wed, 11 Dec 2019 10:25:44 -0700
> From: Dennis Shea <shea at ucar.edu>
> To: Kunal Dayal <kday202 at aucklanduni.ac.nz>
> Cc: Ncl-talk <ncl-talk at ucar.edu>
> Subject: Re: [ncl-talk] How to average monthly wind direction and
> represent them as wind barbs
> Message-ID:
> <CAOF1d_6o2Zv9R1dr=
> YCorvhVKRXGNNAfQQ9e0qdWWYnTYXTXxA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> To compute average wind direction
> [1] compute average zonal [u] and meridional [v] components
> [2] use the u and v component averages as input to *wind_direction*
> <
> http://www.ncl.ucar.edu/Document/Functions/Contributed/wind_direction.shtml
> >
> to commute the average direction(s)
> ---
> NCL also has a function *wind_stats*
> <http://www.ncl.ucar.edu/Document/Functions/Contributed/wind_stats.shtml>
>
>
> On Wed, Dec 11, 2019 at 3:24 AM Kunal Dayal via ncl-talk <
> ncl-talk at ucar.edu>
> wrote:
>
> > Hi,
> >
> > I working on mapping wind resources from WRFOUT files.
> >
> > I can easily plot contour maps of average wind speed for a month but I am
> > unable to represent average wind direction in the form of wind barbs.
> >
> > The code I am using for the average wind speed contour maps is as
> follows:
> > "
> > begin
> > a =
> >
> addfile("/scale_wlg_persistent/filesets/project/uoa02450/wrf-topo2sstpblmix/wrfout_d03_2017-06-28_00:00:
> > 00.nc","r")
> > type = "pdf"
> > wks = gsn_open_wks(type,"Average Wind Speed - Jul 2017")
> > opts = True
> > opts at MainTitle = "WIND SPEED"
> > pltres = True
> > mpres = True
> >
> > times = wrf_user_getvar(a,"times",-1)
> > ntimes = dimsizes(times)
> >
> > u = wrf_user_getvar(a,"ua",-1)
> > v = wrf_user_getvar(a,"va",-1)
> > spd = (u*u + v*v)^(0.5)
> > spd at description = "Wind Speed"
> > spd at units = "m s-1"
> >
> > spd_avg = dim_avg_n(spd(0:30,:,:,:),0)
> > spd_avg at description = "Average Wind Speed"
> > spd_avg at units = "m s-1"
> >
> > res = True
> > opts = res
> > opts at cnFillOn = True
> > opts at cnLinesOn = True
> > opts at ContourParameters = (/ 0., 12., 0.5/)
> > opts at gsnSpreadColorEnd = -3
> > contour_spd_avg = wrf_contour(a,wks,spd_avg(0,:,:),opts)
> > delete(opts)
> >
> > plot = wrf_map_overlays(a,wks,(/contour_spd_avg/),pltres,mpres)
> >
> > end
> > "
> > I wish to add monthly average wind direction to the same maps in the form
> > of wind barbs.
> >
> > Appreciate your assistance and advice.
> >
> > Regards
> > Kunal
> > _______________________________________________
> > ncl-talk mailing list
> > ncl-talk at ucar.edu
> > List instructions, subscriber options, unsubscribe:
> > http://mailman.ucar.edu/mailman/listinfo/ncl-talk
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>
> ------------------------------
>
> Message: 8
> Date: Wed, 11 Dec 2019 10:43:03 -0700
> From: Dennis Shea <shea at ucar.edu>
> To: Ehsan Taghizadeh <ehsantaghizadeh at yahoo.com>
> Cc: Ncl-talk <ncl-talk at ucar.edu>
> Subject: Re: [ncl-talk] GFS interpolation (vertical and horizontal)
> Message-ID:
> <
> CAOF1d_7xy3XfZQQrbELas8nGtOkYfyURWjaUM064+qJHdeZW1w at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> ncl-talk does not want to see a script "with many problems."
> We do not have the time to sort/debug multiple issues.
> ---
> GFS are ordered N->S
> [1] reorder S->N via NCL syntax: x(:,:,::-1,:)
> [2] Use *linint2_points_Wrap*
> <
> http://www.ncl.ucar.edu/Document/Functions/Contributed/linint2_points_Wrap.shtml
> >
> to interpolate to desired locations
> [3] Use *int2p_n_Wrap*
> <http://www.ncl.ucar.edu/Document/Functions/Contributed/int2p_n_Wrap.shtml
> >
> to interpolate to desired level(s)
>
>
>
> On Wed, Dec 11, 2019 at 4:42 AM Ehsan Taghizadeh via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
> > Dears,
> > I hope you're doing great.
> > May I ask if anybody has a script to interpolate GFS (0.5 deg) on the
> > desired station points and also the desired vertical level? I mean (both
> > horizontal and vertical interpolation).
> > Should I attach my script, however it faces many problems?
> > I'll be thankful for any help.
> >
> > Sincerely
> > Ehsan
> >
> > _______________________________________________
> > ncl-talk mailing list
> > ncl-talk at ucar.edu
> > List instructions, subscriber options, unsubscribe:
> > http://mailman.ucar.edu/mailman/listinfo/ncl-talk
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>
> ------------------------------
>
> Message: 9
> Date: Wed, 11 Dec 2019 11:07:44 -0700
> From: Dennis Shea <shea at ucar.edu>
> To: Debashis Paul <debgeo668 at gmail.com>
> Cc: Ncl-talk <ncl-talk at ucar.edu>
> Subject: Re: [ncl-talk] help in remove period mean
> Message-ID:
> <CAOF1d_7mVa9WkyC00mJ2pMOZcPRWMT60PW=qeK8_-8a=
> 2u5SmQ at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> re: "...getting an error of coordinate mismatch"
>
> This does not provide any useful information.
> *You* should be using 'printVarSummary' on variables prior to the offending
> line.
> Look at the output. What coordinates could be a mismatch?
>
>
>
> On Wed, Dec 11, 2019 at 7:56 AM Debashis Paul via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
> > Hi NCL,
> > This mail is in reference to the mail I have done yesterday
> > regarding help in doing removal of the periodic mean. I did how I was
> > advised to do by Dennis Sir, but am getting an error of coordinate
> > mismatch. I have attached my ncl script, if anyone can say me where am I
> > wrong or how to do remove periodic mean it will be much appreciated.
> > Thanks in advance,
> > With regards,
> > *Debashis Paul*
> >
> > *Research Scholar,NIT-RKL*
> > *Ph:+916002713628*
> > *E-mail: Debgeo668 at gmail.com <Debgeo668 at gmail.com>*
> > _______________________________________________
> > ncl-talk mailing list
> > ncl-talk at ucar.edu
> > List instructions, subscriber options, unsubscribe:
> > http://mailman.ucar.edu/mailman/listinfo/ncl-talk
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>
> ------------------------------
>
> Subject: Digest Footer
>
> _______________________________________________
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> End of ncl-talk Digest, Vol 193, Issue 21
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