Ming Hu

Developmental Testbed Center

Introduction to Practice Session

2011 GSI Community Tutorial June 29-July 1, 2011, Boulder, CO

Practice sessions: List of content

http://www.dtcenter.org/com-GSI/users/tutorial/online_tutorial/Practical_2011/

IntroductionBasic Practical Cases: Wednesday and Thursday

3:30-5:30 pm6 cases

Advanced Practical Session: Friday 9:00 am – 2:30 pm A: Repeat basic practice with new data (6 cases)B: cyclingC: Single Observation Test with Hybrid GSI

Building GSI from Scratch

IntroductionBasic application

skills about computers in the COMET classroom

Setup GSI and WRF system on your own local machine

Precompiled GSI Precompiled WRF-ARW Precompiled WRF-NMM

Get data for practice

Where is the data What kind of data available

Welcome to 2011 GSI Tutorial Practical Session Guide!

The DTC community GSI analysis system V3 and WRFV3.3 have been pre-compiled on the tutorial machines. Please copy the executables into your working directory and use them for the tutorial to ensure that you get the most from these practical sessions. If you want to experiment compiling GSI, Please check here for directions.

These tutorial exercises are designed to be run on the Linux workstations provided in COMET classroom. The source code and data files needed for these exercises are provided, and available on an external directory.

Using the COMET Classroom machines

Setting up the GSI system

Case data summary and download

Basic Practical CasesBasic Practical Cases

0). BUFR/PrepBUFR tools [practice]

The run the following practical case, the key is to modify the sample run script. Here we will first make some changes used by all the basic cases: [prepare]

1). Single Observation Tests: * [a]. ARW background with global BE * [b]. ARW background with NAM BE * [c]. NMM background with global BE * [d]. NMM background with NAM BE

2). Test with conventional data (prepbufr): * [a]. ARW background * [b]. NMM background

3). Test with conventional and satellite radiance data: * [a]. ARW background * [b]. NMM background

4). Test with conventional and gpsro data: * [a]. ARW background * [b]. NMM background

5). Test with conventional data and radar radial wind: * [a]. ARW background * [b]. NMM background

IntroductionBackground and DataSetting up the Run

ScriptLine to line instructionSample script

Running the ScriptResults

Standard out (stdout)Fit filesconvergence

Visualizing the Analysis

Basic Practical Cases

IntroductionBackground and DataSetting up the Run

ScriptLine to line instructionSample script

Running the ScriptResults

Standard out (stdout)Fit filesconvergence

Visualizing the Analysis

GSI fundamentals

(1): Setup and Compilation(2): Run and Namelist

(3): Diagnostics

Community GSI tools

(1): PrepBUFR/BUFR: Basic tools, NCEP data tank, and Obsproc

GSI fundamentals

(4): Applications

Basic Practical Cases 0). BUFR/PrepBUFR tools 1). Single Observation Tests 2). Test with conventional data (prepbufr) 3). Test with conventional and satellite radiance data 4). Test with conventional and gpsro data 5). Test with conventional data and radar radial wind

Advanced Practical Session A:

Repeat basic practice with new data

A0). BUFR/PrepBUFR tools [practice]

Please repeat the basic case 1 to 5 using the new data at 00Z June 05, 2011. Users can get the data following the instruction at: Case data summary and download Note: the BUFR/PrepBUFR files were created on IBM machine, which are Big Endian files. To use these files on Linux machine, files need to be converted to Little Endian files.

A1). Single Observation Tests: * [a]. ARW background with global BE * [b]. ARW background with NAM BE * [c]. NMM background with global BE * [d]. NMM background with NAM BE Test with encoded PrepBUFR file with Single Observation: * [e]. ARW background with global BE * [f]. NMM background with global BE

A2). Test with conventional data (prepbufr): * [a]. ARW background * [b]. NMM background

A3). Test with conventional and satellite radiance data: * [a]. ARW background * [b]. NMM background

A4). Test with conventional and gpsro data: * [a]. ARW background * [b]. NMM background

A5). Test with conventional data and radar radial wind: * [a]. ARW background * [b]. NMM background

IntroductionSetting up the Run

ScriptNo instruction!Sample script

Running the ScriptResults

stdout,Fit filefort.220

Visualizing the Analysis

Advanced Practical Session A and Basic Practical Cases

Repeat basic practice with new data

A0). BUFR/PrepBUFR tools [practice]

A1). Single Observation Tests: * [a]. ARW background with global BE * [b]. ARW background with NAM BE * [c]. NMM background with global BE * [d]. NMM background with NAM BE Test with encoded PrepBUFR file with Single Observation: * [e]. ARW background with global BE * [f]. NMM background with global BE

A2). Test with conventional data (prepbufr): * [a]. ARW background * [b]. NMM background

A3). Test with conventional and satellite radiance data: * [a]. ARW background * [b]. NMM background

A4). Test with conventional and gpsro data: * [a]. ARW background * [b]. NMM background

A5). Test with conventional data and radar radial wind: * [a]. ARW background * [b]. NMM background

Basic Practical Cases

0). BUFR/PrepBUFR tools [practice]

1). Single Observation Tests: * [a]. ARW background with global BE * [b]. ARW background with NAM BE * [c]. NMM background with global BE * [d]. NMM background with NAM BE

2). Test with conventional data (prepbufr): * [a]. ARW background * [b]. NMM background

3). Test with conventional and satellite radiance data: * [a]. ARW background * [b]. NMM background

4). Test with conventional and gpsro data: * [a]. ARW background * [b]. NMM background

5). Test with conventional data and radar radial wind: * [a]. ARW background * [b]. NMM background

Advanced Practical Session B

Advanced Practical Session B: cycling

This exercise is to illustrate the basic structure and flow of a cycling data assimilation system. We will use the data on June 5, 2011 to manually run data assimilation cycles from 00z to 12z with 6 hour interval on June 5. The June 5, 2011 data have been used for the Advanced Practical session A and users should have downloaded the data after play with the Advanced Practical cases. If not, please check Case data summary and download.

The flow chart of this practical cycling data assimilation system can be found at here.

B1). GSI and ARW Cycling exercise: * [00z]. cycle 2011060500 * [06z]. cycle 2011060506 * [12z]. cycle 2011060512

B2). GSI and NMM Cycling exercise: * [00z]. cycle 2011060500 * [06z]. cycle 2011060506 * [12z]. cycle 2011060512

IntroductionSetting up the GSI Run Script

No instructionsSample script

Running the GSI run Script and checking the resultsSame as other cases

Setting up ARW run environmentWith detailed instructions

Running the ARW and checking the forecast results

Advanced Practical Session CA single observation test Perturbations have been provided

Suggestions and notesBasic cases: try to go through

Pick ARW or NMM, or mixAdvanced cases: optional practices

A: Pick up cases based on needsB: Has to try A2 first (A2a-->B1, A2b-->B2)

All cases will be uploaded on-line after tutorial

3-4 instructors in classroom to helpA sheet lists important information

(available in classroom)

Questions?

GSI Tutorial Survey:https://survey.ucar.edu/s?s=7255