[netcdfgroup] netCDF Operators NCO version 4.9.7 have arrived

• To: netcdfgroup@xxxxxxxxxxxxxxxx, NCO Announce Mail List <nco-announce@xxxxxxxxxxxxxxxxxxxxx>
• Subject: [netcdfgroup] netCDF Operators NCO version 4.9.7 have arrived
• From: Charlie Zender <zender@xxxxxxx>
• Date: Sun, 27 Dec 2020 13:47:36 -0800

The netCDF Operators NCO version 4.9.7 have arrived.

http://nco.sf.net (Homepage, Mailing lists, Help)
http://github.com/nco (Source Code, Issues, Releases, Developers)

What's new?
Version 4.9.7 is a minor NCO release that contains a few new features

Work on NCO 4.9.8 has commenced and will improve analysis of land
surface datasets packed into sparse-1D formats.

Enjoy,
Charlie

NEW FEATURES (full details always in ChangeLog):

A. ncremap can now infer SCRIP grids from MPAS restart files.
This is useful when users lack access to the gridfiles their
model used. This can easily happen when running standalone
MPAS simulations that use non-scientifically validated grids.
Previously inferring MPAS grids produce incomplete (no corners)
and erroneous (degrees not radians in metadata) grids.
Now the inferred grids are complete, consistent, and BFB with
the original grids used in the MPAS simulation.

ncremap -d ~/restart.2001-01-01_00.00.00.nc -g QU120_zach.nc

http://nco.sf.net/nco.html#ncremap
http://nco.sf.net/nco.html#infer

B. ncremap and ncclimo have been updated to work in MPI mode
on the new DOE machines Andes (ORNL) and Chrysalis (ANL LCRC).
http://nco.sf.net/nco.html#par_typ

C. NCO can be built to leverage the Communinty Codec Repository.
The CCR is currently supports two lossless compression filters
(BZip2, Zstandard) and one lossy quantization filter (BitGroom).
More importantly, the CCR is extensible and provides the C/Fortran
API for defining alternative (non-DEFLATE) compression using
a netCDF-like API at file creation time. The NCO ncap2 operator
will now access these filters for rewriting variables in existing
files:

./configure --enable-ccr; make; make install # Build NCO with CCR
ncap2 -O -7 --ccr=Zstd -L 3 -s 'two=one+one' in.nc out.nc
ncap2 -O -7 --ccr=BitGroom -L 3 -s 'two=one+one' in.nc out.nc
ncks -C --hdn -v three_dmn_rec_var out.nc # Examine data

http://github.com/ccr/ccr
CCR capabilities, and NCO support for them, will expand in 2021.
Thanks to Ed Hartnett of NOAA (and netCDF4/PIO fame) for partnering
on the CCR! See our poster on the CCR 1.1 release at AMS.

BUG FIXES:

A. ncclimo fixes the bug that caused the --glb_avg option to fail
when invoked in a batch-queue submission. Thanks to Chris Golaz
for reporting. The problem was subtle and only exposed itself when
invoked on multiple input variables on nodes with fast response
times (bug appeared only in batch queues not interactive nodes).
The solution is to upgrade.

B. ncclimo fixes a bug introduced in 4.9.6 that caused the
high-frequency climo mode to diagnose the wrong timesteps-per-day
(tpd) in the input file. Thanks to Jill Chang for reporting.
Workaround is to manually specify with --tpd or to upgrade.

Full release statement at http://nco.sf.net/ANNOUNCE

--
Charlie Zender, Earth System Sci. & Computer Sci.
University of California, Irvine 949-891-2429 )'(