[Met_help] [rt.rap.ucar.edu #85000] History for Support for Sea Ice verification at EMC
John Halley Gotway via RT
met_help at ucar.edu
Tue Jul 9 12:06:55 MDT 2019
----------------------------------------------------------------
Initial Request
----------------------------------------------------------------
Bob,
Transferring this into met_help (met_help at ucar.edu) to facilitate better
support. Including excerpts from previous emails to point us all in the
right direction.
John wrote a question to me about the values over land. Please see below
and let us know if we are reading the file correctly.
Also - please feel free to reply here with paths to other sample files here.
met_help at ucar.edu is also the best way to get help with setting up and
running MET on WCOSS and Theia.
Cheers, Tara
On Thu, May 3, 2018 at 3:21 PM, John Halley Gotway <johnhg at ucar.edu> wrote:
> Little weird that the "ICEC Ice Cover [Proportion]" has a value of 1.570
> over land. We could change that to a missing data value with the censoring
> options:
>
> /usr/local/met-7.0/bin/plot_data_plane eng.grib2.20180503
> eng.grib2.20180503.ps 'name="ICEC"; level="L0"; censor_thresh=gt1;
> censor_val=-9999;'
>
> John
>
>
>
On Thu, May 3, 2018 at 3:18 PM, John Halley Gotway <johnhg at ucar.edu> wrote:
> Seems to work fine:
>
> /usr/local/met-7.0/bin/plot_data_plane eng.grib2.20180503
> eng.grib2.20180503.ps 'name="ICEC"; level="L0";'
> convert -rotate 90 -background white -flatten eng.grib2.20180503.ps
> eng.grib2.20180503.png
>
> John
>
> On Thu, May 3, 2018 at 1:12 PM, Tara Jensen <jensen at ucar.edu> wrote:
>
>> Hi John,
>>>>
>>>> I've been discussing Sea Ice verification with Bob Grumbine at EMC. He
>>>> pointed me to a sample of ice concentration grib2 files. I pulled one down
>>>> and tried to plot it using plot_data_plane but it didn't work for me - not
>>>> sure if it's the file or me. I'm guessing it's me. Can you take a quick
>>>> look at the file? It's on dakota:/d3/projects/NCEP_Vx/sea_ice/
>>>>
>>>> this was my call BTW: plot_data_plane eng.grib2.20180503 test.ps
>>>> name="ICEC"; level="L0";
>>>>
>>>> Thanks, Tara
>>>>
>>>>
On Wed, May 2, 2018 at 10:31 AM, Robert Grumbine - NOAA Federal <
robert.grumbine at noaa.gov> wrote:
> Hi Tara,
>
> The sea ice data are in ASCII (Arctic buoy program), BUFR (passive
> microwaves), GRIB2 (ice concentration / cover analyses), and netcdf
> (coupled model outputs). Cryosat doesn't provide near real time ice
> thicknesses/freeboard, and, iirc, neither does Altika or the other
> altimeters, but, to the extent we get them, they're BUFR. iow, mostly
> standard formats already familiar to everybody.
>
> Copies of the operational ice concentration analysis are in
> ftp://polar.ncep.noaa.gov/cdas/ -- the '5min' files are the high
> resolution, preferred, files to work with. Grib2 copies. There's a longer
> archive in the subirectory 'archive'.
>
> Thanks,
> Bob
>
>
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Tara Jensen
Project Manager II
NCAR RAL and DTC
PO Box 3000, Boulder, Colorado 80307 USA
+1 303-497-8479 jensen at ucar.edu
----------------------------------------------------------------
Complete Ticket History
----------------------------------------------------------------
Subject: Support for Sea Ice verification at EMC
From: Tara Jensen
Time: Tue Mar 05 07:55:23 2019
Bob,
Thank you for bringing to our attention this ticket has gone stale.
Please review the attached image of CICE and let us know if it looks
reasonable and if it makes sense to set CICE > 1.0 to -9999 to tell
MET to not evaluate those gridpoints.
Once we have this dataset undercontrol, the next thing is to point us
to what you want to use for evaluation.
Cheers, Tara
On Fri May 04 10:04:20 2018, jensen wrote:
> Bob,
>
> Transferring this into met_help (met_help at ucar.edu) to facilitate
> better
> support. Including excerpts from previous emails to point us all in
> the
> right direction.
>
> John wrote a question to me about the values over land. Please see
> below
> and let us know if we are reading the file correctly.
>
> Also - please feel free to reply here with paths to other sample
files
> here.
>
> met_help at ucar.edu is also the best way to get help with setting up
and
> running MET on WCOSS and Theia.
>
> Cheers, Tara
>
> On Thu, May 3, 2018 at 3:21 PM, John Halley Gotway <johnhg at ucar.edu>
> wrote:
>
> > Little weird that the "ICEC Ice Cover [Proportion]" has a value of
> > 1.570
> > over land. We could change that to a missing data value with the
> > censoring
> > options:
> >
> > /usr/local/met-7.0/bin/plot_data_plane eng.grib2.20180503
> > eng.grib2.20180503.ps 'name="ICEC"; level="L0"; censor_thresh=gt1;
> > censor_val=-9999;'
> >
> > John
> >
> >
> >
> On Thu, May 3, 2018 at 3:18 PM, John Halley Gotway <johnhg at ucar.edu>
> wrote:
>
> > Seems to work fine:
> >
> > /usr/local/met-7.0/bin/plot_data_plane eng.grib2.20180503
> > eng.grib2.20180503.ps 'name="ICEC"; level="L0";'
> > convert -rotate 90 -background white -flatten
eng.grib2.20180503.ps
> > eng.grib2.20180503.png
> >
> > John
> >
> > On Thu, May 3, 2018 at 1:12 PM, Tara Jensen <jensen at ucar.edu>
wrote:
> >
> >> Hi John,
> >>>>
> >>>> I've been discussing Sea Ice verification with Bob Grumbine at
> >>>> EMC. He
> >>>> pointed me to a sample of ice concentration grib2 files. I
pulled
> >>>> one down
> >>>> and tried to plot it using plot_data_plane but it didn't work
for
> >>>> me - not
> >>>> sure if it's the file or me. I'm guessing it's me. Can you
take
> >>>> a quick
> >>>> look at the file? It's on dakota:/d3/projects/NCEP_Vx/sea_ice/
> >>>>
> >>>> this was my call BTW: plot_data_plane eng.grib2.20180503
test.ps
> >>>> name="ICEC"; level="L0";
> >>>>
> >>>> Thanks, Tara
> >>>>
> >>>>
>
>
> On Wed, May 2, 2018 at 10:31 AM, Robert Grumbine - NOAA Federal <
> robert.grumbine at noaa.gov> wrote:
>
> > Hi Tara,
> >
> > The sea ice data are in ASCII (Arctic buoy program), BUFR (passive
> > microwaves), GRIB2 (ice concentration / cover analyses), and
netcdf
> > (coupled model outputs). Cryosat doesn't provide near real time
ice
> > thicknesses/freeboard, and, iirc, neither does Altika or the other
> > altimeters, but, to the extent we get them, they're BUFR. iow,
mostly
> > standard formats already familiar to everybody.
> >
> > Copies of the operational ice concentration analysis are in
> > ftp://polar.ncep.noaa.gov/cdas/ -- the '5min' files are the high
> > resolution, preferred, files to work with. Grib2 copies. There's
a
> > longer
> > archive in the subirectory 'archive'.
> >
> > Thanks,
> > Bob
> >
> >
------------------------------------------------
Subject: Support for Sea Ice verification at EMC
From: robert.grumbine at noaa.gov
Time: Tue Mar 05 10:00:24 2019
Thanks Tara.
Yes, reflagging points over 1.00 concentration as 'ignore' is good.
A question, though: Can Met perform polar stereographic plots? This
lat-lon
display is only usable for the absolute crudest looks at the poles.
My analysis system's grids are NCEP grids # 171, 172, 173 and 219,
220,
235, which I see none are in the pre-defined set.
Thanks,
Bob
On Tue, Mar 5, 2019 at 9:55 AM Tara Jensen via RT <met_help at ucar.edu>
wrote:
> Bob,
>
> Thank you for bringing to our attention this ticket has gone stale.
> Please review the attached image of CICE and let us know if it looks
> reasonable and if it makes sense to set CICE > 1.0 to -9999 to tell
MET to
> not evaluate those gridpoints.
>
> Once we have this dataset undercontrol, the next thing is to point
us to
> what you want to use for evaluation.
>
> Cheers, Tara
>
> On Fri May 04 10:04:20 2018, jensen wrote:
> > Bob,
> >
> > Transferring this into met_help (met_help at ucar.edu) to facilitate
> > better
> > support. Including excerpts from previous emails to point us all
in
> > the
> > right direction.
> >
> > John wrote a question to me about the values over land. Please see
> > below
> > and let us know if we are reading the file correctly.
> >
> > Also - please feel free to reply here with paths to other sample
files
> > here.
> >
> > met_help at ucar.edu is also the best way to get help with setting up
and
> > running MET on WCOSS and Theia.
> >
> > Cheers, Tara
> >
> > On Thu, May 3, 2018 at 3:21 PM, John Halley Gotway
<johnhg at ucar.edu>
> > wrote:
> >
> > > Little weird that the "ICEC Ice Cover [Proportion]" has a value
of
> > > 1.570
> > > over land. We could change that to a missing data value with
the
> > > censoring
> > > options:
> > >
> > > /usr/local/met-7.0/bin/plot_data_plane eng.grib2.20180503
> > > eng.grib2.20180503.ps 'name="ICEC"; level="L0";
censor_thresh=gt1;
> > > censor_val=-9999;'
> > >
> > > John
> > >
> > >
> > >
> > On Thu, May 3, 2018 at 3:18 PM, John Halley Gotway
<johnhg at ucar.edu>
> > wrote:
> >
> > > Seems to work fine:
> > >
> > > /usr/local/met-7.0/bin/plot_data_plane eng.grib2.20180503
> > > eng.grib2.20180503.ps 'name="ICEC"; level="L0";'
> > > convert -rotate 90 -background white -flatten
eng.grib2.20180503.ps
> > > eng.grib2.20180503.png
> > >
> > > John
> > >
> > > On Thu, May 3, 2018 at 1:12 PM, Tara Jensen <jensen at ucar.edu>
wrote:
> > >
> > >> Hi John,
> > >>>>
> > >>>> I've been discussing Sea Ice verification with Bob Grumbine
at
> > >>>> EMC. He
> > >>>> pointed me to a sample of ice concentration grib2 files. I
pulled
> > >>>> one down
> > >>>> and tried to plot it using plot_data_plane but it didn't work
for
> > >>>> me - not
> > >>>> sure if it's the file or me. I'm guessing it's me. Can you
take
> > >>>> a quick
> > >>>> look at the file? It's on
dakota:/d3/projects/NCEP_Vx/sea_ice/
> > >>>>
> > >>>> this was my call BTW: plot_data_plane eng.grib2.20180503
test.ps
> > >>>> name="ICEC"; level="L0";
> > >>>>
> > >>>> Thanks, Tara
> > >>>>
> > >>>>
> >
> >
> > On Wed, May 2, 2018 at 10:31 AM, Robert Grumbine - NOAA Federal <
> > robert.grumbine at noaa.gov> wrote:
> >
> > > Hi Tara,
> > >
> > > The sea ice data are in ASCII (Arctic buoy program), BUFR
(passive
> > > microwaves), GRIB2 (ice concentration / cover analyses), and
netcdf
> > > (coupled model outputs). Cryosat doesn't provide near real time
ice
> > > thicknesses/freeboard, and, iirc, neither does Altika or the
other
> > > altimeters, but, to the extent we get them, they're BUFR. iow,
mostly
> > > standard formats already familiar to everybody.
> > >
> > > Copies of the operational ice concentration analysis are in
> > > ftp://polar.ncep.noaa.gov/cdas/ -- the '5min' files are the high
> > > resolution, preferred, files to work with. Grib2 copies.
There's a
> > > longer
> > > archive in the subirectory 'archive'.
> > >
> > > Thanks,
> > > Bob
> > >
> > >
>
>
>
>
--
Tel: 301-683-3747
Coupling and Dynamics Group
------------------------------------------------
Subject: Support for Sea Ice verification at EMC
From: robert.grumbine at noaa.gov
Time: Tue Mar 12 07:28:13 2019
Some starting points on operational models and data
*Some observation locations:*
The IMS ice analysis is /dcom/us*/YYYYMMDD/wgrbbul/imssnow96.grb.grib2
(1/96th Bedient, Grib2), includes both ice and snow. I only use the
ice.
The IMS ice / no-ice transition is at 40% concentration, and I use
that
versus the model's transition location (edge) for skill assessment.
The operational ice concentration analysis is in
/com2/omb/prod/sice.YYYYMMDD
files (grib2 format):
seaice.t00z.5min.grb.grib2 -- global, 5 arcmin, L4 grid
seaice.t00z.north12psg.grib2 -- northern hemisphere, 12.7 km polar
stereo,
L3 grid
seaice.t00z.south12psg.grib2 -- southern hemisphere, 12.7 km polar
stereo,
L3 grid
The International Arctic Drifting Buoy Program data is at
http://iabp.apl.washington.edu/WebData/
files X.dat, where X can be a very (~30 character) long string. I use
this
for verifying the sea ice drift model. The buoys also may include
surface
pressure, air temperature, water temperature, winds, and other
variables.
ASCII format (that changes on a few years' time scale)
The IFREMER sea ice drift satellite observations are at
ftp://ftp.ifremer.fr/ifremer/cersat/products/grid/psi-
drift/data/arctic/amsr2-merged/N-daily/ascii
where N is 3 or 6. ASCII format.
*Operational model output locations:*
Sea ice output from the RTOFS model's ice component is in
/com2/rtofs/prod/rtofs.YYYYMMDD/*cice_inst (netcdf)
Sea ice output from RTOFS ocean model side is in
/com2/rtofs/prod/rtofs.YYYYMMDD/rtofs_glo_2ds_*_daily_diag.nc (netcdf)
While both grids are tripolar, their cell count is different. Denise
Worthen can explain which row or column is simply duplicated in the
ocean
grid. (ice is 1 shorter)
Sea ice drift model is at
/com/omb/prod/seaice_drift.YYYYMMDD/
file global.YYYYMMDD is the compact ASCII version, which requires the
file
forecast.points to interpret fully.
the .kml files can be read on their own
Warning: all distances are Nautical Miles, not km.
The S2S coupled system in development's ocean and ice are on a
different
tripolar grid than above, but the ice variables to be considered are
the
same.
Thanks,
Bob
On Tue, Mar 5, 2019 at 9:55 AM Tara Jensen via RT <met_help at ucar.edu>
wrote:
> Bob,
>
> Thank you for bringing to our attention this ticket has gone stale.
> Please review the attached image of CICE and let us know if it looks
> reasonable and if it makes sense to set CICE > 1.0 to -9999 to tell
MET to
> not evaluate those gridpoints.
>
> Once we have this dataset undercontrol, the next thing is to point
us to
> what you want to use for evaluation.
>
> Cheers, Tara
>
> On Fri May 04 10:04:20 2018, jensen wrote:
> > Bob,
> >
> > Transferring this into met_help (met_help at ucar.edu) to facilitate
> > better
> > support. Including excerpts from previous emails to point us all
in
> > the
> > right direction.
> >
> > John wrote a question to me about the values over land. Please see
> > below
> > and let us know if we are reading the file correctly.
> >
> > Also - please feel free to reply here with paths to other sample
files
> > here.
> >
> > met_help at ucar.edu is also the best way to get help with setting up
and
> > running MET on WCOSS and Theia.
> >
> > Cheers, Tara
> >
> > On Thu, May 3, 2018 at 3:21 PM, John Halley Gotway
<johnhg at ucar.edu>
> > wrote:
> >
> > > Little weird that the "ICEC Ice Cover [Proportion]" has a value
of
> > > 1.570
> > > over land. We could change that to a missing data value with
the
> > > censoring
> > > options:
> > >
> > > /usr/local/met-7.0/bin/plot_data_plane eng.grib2.20180503
> > > eng.grib2.20180503.ps 'name="ICEC"; level="L0";
censor_thresh=gt1;
> > > censor_val=-9999;'
> > >
> > > John
> > >
> > >
> > >
> > On Thu, May 3, 2018 at 3:18 PM, John Halley Gotway
<johnhg at ucar.edu>
> > wrote:
> >
> > > Seems to work fine:
> > >
> > > /usr/local/met-7.0/bin/plot_data_plane eng.grib2.20180503
> > > eng.grib2.20180503.ps 'name="ICEC"; level="L0";'
> > > convert -rotate 90 -background white -flatten
eng.grib2.20180503.ps
> > > eng.grib2.20180503.png
> > >
> > > John
> > >
> > > On Thu, May 3, 2018 at 1:12 PM, Tara Jensen <jensen at ucar.edu>
wrote:
> > >
> > >> Hi John,
> > >>>>
> > >>>> I've been discussing Sea Ice verification with Bob Grumbine
at
> > >>>> EMC. He
> > >>>> pointed me to a sample of ice concentration grib2 files. I
pulled
> > >>>> one down
> > >>>> and tried to plot it using plot_data_plane but it didn't work
for
> > >>>> me - not
> > >>>> sure if it's the file or me. I'm guessing it's me. Can you
take
> > >>>> a quick
> > >>>> look at the file? It's on
dakota:/d3/projects/NCEP_Vx/sea_ice/
> > >>>>
> > >>>> this was my call BTW: plot_data_plane eng.grib2.20180503
test.ps
> > >>>> name="ICEC"; level="L0";
> > >>>>
> > >>>> Thanks, Tara
> > >>>>
> > >>>>
> >
> >
> > On Wed, May 2, 2018 at 10:31 AM, Robert Grumbine - NOAA Federal <
> > robert.grumbine at noaa.gov> wrote:
> >
> > > Hi Tara,
> > >
> > > The sea ice data are in ASCII (Arctic buoy program), BUFR
(passive
> > > microwaves), GRIB2 (ice concentration / cover analyses), and
netcdf
> > > (coupled model outputs). Cryosat doesn't provide near real time
ice
> > > thicknesses/freeboard, and, iirc, neither does Altika or the
other
> > > altimeters, but, to the extent we get them, they're BUFR. iow,
mostly
> > > standard formats already familiar to everybody.
> > >
> > > Copies of the operational ice concentration analysis are in
> > > ftp://polar.ncep.noaa.gov/cdas/ -- the '5min' files are the high
> > > resolution, preferred, files to work with. Grib2 copies.
There's a
> > > longer
> > > archive in the subirectory 'archive'.
> > >
> > > Thanks,
> > > Bob
> > >
> > >
>
>
>
>
--
Tel: 301-683-3747
Coupling and Dynamics Group
------------------------------------------------
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