[Dart-dev] DART/branches Revision: 12572

[dart at ucar.edu]

nancy at ucar.edu
2018-05-03 09:30:10 -0600 (Thu, 03 May 2018)
193
added the contents of README.iono_example_files and
the README from the glade GPS observations dir to
the workflow section to point people using cheyenne
to the already converted obs on disk.




Modified: DART/branches/rma_trunk/observations/obs_converters/gps/gps.html
===================================================================
--- DART/branches/rma_trunk/observations/obs_converters/gps/gps.html	2018-05-03 15:20:58 UTC (rev 12571)
+++ DART/branches/rma_trunk/observations/obs_converters/gps/gps.html	2018-05-03 15:30:10 UTC (rev 12572)
@@ -570,9 +570,10 @@
 </P>
 
 <P>
-<pre>
 <b>Making DART Observations from Radio Occultation atmPrf Profiles:</b>
+<br />
 
+<pre>
 Description of the scripts provided to process the COSMIC and 
 CHAMP GPS radio occultation data.
 
@@ -616,7 +617,7 @@
 in the ../work directory, but you may have to copy or link to a
 version from this dir.  you also need a minimal input.nml here:
 
-&utilities_nml
+&utilities_nml
  /
 
 is all the contents it needs.
@@ -634,9 +635,10 @@
 <br />
 
 <P>
-<pre>
 <b>Making DART Observations from Ionospheric ionPrf Profiles:</b>
+<br />
 
+<pre>
 0) run quickbuild.csh as described above
 
 1) iono_to_obsseq.csh
@@ -649,11 +651,123 @@
 
 split the daily files into X minute/hour files - set the
 window times at the top of the file before running.
+</pre>
+</P>
 
+<br />
+<br />
 
+<P>
+<b>Notes on already converted observations on the NCAR supercomputers</b>
+<br />
+<br />
+
+<b>GPS Radio Occultation Data:</b>
+<br />
+<br />
+
+<pre>
+See /glade/p/image/Observations/GPS
+
+These are DART observation sequence files that contain
+radio-occultation measurements from the COSMIC
+(and other) satellites.  
+
+Uses temperature/moisture bending of the signals as they
+pass through the atmosphere between GPS source satellites
+and low-earth-orbit receiving satellites to compute the 
+delay in the arrival of data. the files also contain the
+bending angle data, but we are not using that currently.
+
+
+the subdirectories include:
+
+local -- original processed files, single obs at nadir
+local-cosmic2013 -- reprocessed by CDAAC in 2013
+local-test2013 -- 2013 data, denser in vertical, diff errors
+local-complete2013 - all satellites available for that time, 
+ new errors (from lydia c), 2013 cosmic reprocessed data
+nonlocal -- original processed files, ray-path integrated
+rawdata -- netcdf data files downloaded from the CDAAC
+
+local: the ob is at a single location (the tangent point
+of the ray and earth) and the entire effect is assumed 
+to be impacting the state at that point.
+
+non-local: computes the ob value by doing a line integral
+along the ray path to accumulate the total effect.
+
+(in our experiments we have compared both and did not see 
+a large difference between the two methods, and so have 
+mistly used the local version because it's faster to run.)
+
+
+some directories contain only the gps obs and must be
+merged (with the obs_sequence_tool) with the rest of
+the conventional obs before assimilation.
+
+some directories contain both the gps-only files and
+the obs merged with NCEP and ACARS data.
+
+
+if a directory exists but is empty, the files are