<p><b>xinzhang</b> 2009-03-18 14:14:32 -0600 (Wed, 18 Mar 2009)</p><p>Save the updates for chap6.<br>
</p><hr noshade><pre><font color="gray">Modified: trunk/wrf/UsersGuide/users_guide_chap6.doc
===================================================================
--- trunk/wrf/UsersGuide/users_guide_chap6.doc 2009-03-18 19:19:30 UTC (rev 144)
+++ trunk/wrf/UsersGuide/users_guide_chap6.doc 2009-03-18 20:14:32 UTC (rev 145)
@@ -1,5 +1,5 @@
-ࡱ
-
+
b. Prepare observational data for 4D-Var
-To prepare the observation file, say, at the analysis time 0h for 4D-Var, all observations from 0h to 6h will be processed and grouped in 7 sub-window from slot1 to slot7, as illustrated in following figure.
+To prepare the observation file, say, at the analysis time 0h for 4D-Var, all observations from 0h to 6h will be processed and grouped in 7 sub-windows from slot1 to slot7, as illustrated in following figure.
Before running obsproc.exe, create the required namelist file namelist.obsproc
@@ -239,8 +239,6 @@
obs_gts_2007-01-02_06:00:00.4DVAR
They are the input observation files to WRF-4DVar.
-
-
Running WRF-Var
a. Download Test Data
The WRF-Var system requires three input files to run: a) A WRF first guess input format file output from either WPS/real (cold-start) or WRF (warm-start), b) Observations (in ASCII format or PREBUFR), and c) A background error statistics file (containing background error covariance currently calculated via the NMC-method), using gen_be utility of WRF-Var.
@@ -252,12 +250,20 @@
> setenv DAT_DIR your_choice_of_dat_dir
Here, "your_choice_of_dat_dir" is the directory where you aim to store the WRF-Var input data. Create this directory if it does not exist, and type
> cd $DAT_DIR
-Download the tutorial test data for a con200 case valid at 00 UTC 02 January 2007 from HYPERLINK "http://www.mmm.ucar.edu/wrf/src/data/WRFV3-Var-testdata.tar.gz" http://www.mmm.ucar.edu/wrf/src/data/WRFV3-Var-testdata.tar.gz
-Once you have downloaded WRFV3-Var-testdata.tar.gz file to $DAT_DIR, extract it by typing
- > gunzip WRFV3-Var-testdata.tar.gz > tar -xvf WRFV3-Var-testdata.tar
+Download the tutorial test data for a con200 case valid at 00 UTC 02 January 2007 from HYPERLINK "http://www.mmm.ucar.edu/wrf/src/data/WRFV3.1-Var-testdata.tar.gz" http://www.mmm.ucar.edu/wrf/src/data/WRFV3.1-Var-testdata.tar.gz
+Once you have downloaded WRFV3.1-Var-testdata.tar.gz file to $DAT_DIR, extract it by typing
+ >
gunzip WRFV3.1-Var-testdata.tar.gz > tar -xvf WRFV3.1-Var-testdata.tar
Now you should find the following three sub-directories/files under $DAT_DIR
ob/2007010200/ob.little_r ### Observation data in little_r format rc/2007010200/wrfinput_d01 ###First guess file rc/2007010200/wrfbdy_d01 ### lateral boundary file be/be.dat ### Background error file
-You should first go through the section Running Observation Preprocessor (OBSPROC) and have a WRF-Var-ready observation file (obs_gts_2007-01-02_00:00:00.3DVAR) generated in your OBSPROC working directory. You could then copy or move obs_gts_2007-01-02_00:00:00.3DVAR to be in $DAT_DIR/ob/2007010200.
+You should first go through the section Running Observation Preprocessor (OBSPROC) and have a WRF-3DVar-ready observation file (obs_gts_2007-01-02_00:00:00.3DVAR) generated in your OBSPROC working directory. You could then copy or move obs_gts_2007-01-02_00:00:00.3DVAR to be in $DAT_DIR/ob/2007010200.
+If you wan
t to try 4D-Var, please go through the section Running Obse!
rvation
Preprocessor (OBSPROC) and have WRF-4DVar-ready observation files (obs_gts_2007-01-02_00:00:00.4DVAR,). You could copy or move the observation files to $DAT_DIR/ob using following commands:
+mv obs_gts_2007-01-02_00:00:00.4DVAR $DAT_DIR/ob/2007010200/ob.ascii+
+mv obs_gts_2007-01-02_01:00:00.4DVAR $DAT_DIR/ob/2007010201/ob.ascii
+mv obs_gts_2007-01-02_02:00:00.4DVAR $DAT_DIR/ob/2007010202/ob.ascii
+mv obs_gts_2007-01-02_03:00:00.4DVAR $DAT_DIR/ob/2007010203/ob.ascii
+mv obs_gts_2007-01-02_04:00:00.4DVAR $DAT_DIR/ob/2007010204/ob.ascii
+mv obs_gts_2007-01-02_05:00:00.4DVAR $DAT_DIR/ob/2007010205/ob.ascii
+mv obs_gts_2007-01-02_06:00:00.4DVAR $DAT_DIR/ob/2007010206/ob.ascii-
Now you have all the three input files (first guess, observation and background error statistics files in directory $DAT_DIR) required to run WRF-Var. Also, you have successfully downloaded and compiled the WRF-Var code. If this is correct, we are ready to learn how to run WRF-Var.
b. Ru
n The Case3D-Var
The data for this case is valid at 00 UTC 2nd January 2007. The first guess comes from the NCEP global final analysis system (FNL), passed through the WRF-WPS and real programs. The first-guess level 18 potential temperature field is shown below, illustrating the domain:
@@ -768,7 +774,7 @@
WRF-ARW V3: Users Guide 6- PAGE 8
-WRF-ARW V3: Users Guide 6- PAGE 1
+WRF-ARW V3: Users Guide 6- PAGE 9
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</pre>