Searching for the data for initialization

Submitted by lliu on Wed, 09/08/2021 - 06:37
Forum: Users | Input Data

Could anyone tell me whether the following data work for Hurricane Florence 2018?:

In folder gfs.2018091000 :  gfs.0p25.2018091000.fxxx.grib2 . Can't find the gfs.xxx.xxx.tm00.bufr_d files (similar to those in the test case)

In folder gdas1.2018091000: gdas1.fnl0p25.2018091000.fxx.grib2,  gdas1.sflux.2018091000.fxx.grib2.

I did find the .bufr files but in gdas:  gdas.xxxxx.t00z.20180910.bufr

Can't find enkf data.

Are the above good enough to initialize the HWRF? If yes, what options should I modify from the test case setting?

Greatly appreciate your help!

Liping

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Submitted by biswas on Thu, 09/09/2021 - 13:19

Hi Liping,

If you have access to just GFS GRIB files, you will be able to run HWRF system. If you want to run data assimilation you have the option to run with 3DVAR data assimilation. Please refer to the Section 3.8.4 of the HWRF Users Guide. If you do not have to any observation files (Refer to Section 3.3 of the Users Guide), you can turn off data assimilation (Section 3.8.3). If you do not have access to enkf data you can't run the hybrid data assimilation (default option). 

Ocean initialization: Depending on what GFS files you have/do not have you have the option to run HWRF in a coupled/uncoupled mode (Section 3.8.2).

Please let me know if you decide on a particular setting and I will be happy to help you to configure your experiment. 

Thanks

Biswas

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Submitted by lliu on Sun, 09/12/2021 - 21:38

Dr. Biswas,

Thank you so much!! I suppose my case could be a general case study for the others. So I am posting more details here.

I am trying to simulate Hurricane Florence 2018. In the attached pdf file, I listed the data files I found, from RDA and GFS. It will be wonderful if you could help me configure the experiment. If I need more data, please also kindly point out.

Mainly I found 4 types of data: gdas1, gdas, gfs, and gfs_4 . I only included the forecast for 48 hours (2 days) for gfs and gfs_4 data, just as an example. If the experiment is successful, I will do longer times.

Greatly appreciate your help!

Liping

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Submitted by lliu on Tue, 09/14/2021 - 22:10

Mainly I have three questions: 1. Do I have spectral files in NEMSIO format in my data file list? 2. In the following experiment 2, do I run merge_wrapper? 3. For future experiments, do I have observation data files in my data file list? My question is more like: can I use them in HWRF and how?

To start, I will only use the GFS GRIB data. The following are my thoughts, please correct me if I am wrong.

Coupling with the ocean, which is the default setting, so no change. For POMTC options, since I don't have spectral files in NEMSIO format, so I use SST, set pom.gfssst_type=1. For the GSI, I have two options: 1. turn off GSI; 2. do 3DVAR GSI. Also I will change the names of my gfs data files similar to the data files for Irma test case. Therefore, I shall set up two experiments:

1. Add in launcher_wrapper: pom.gfssst_type=1, prelaunch.basin_overrides=no, run_gsi=no. Run the wrappers: launcher_wrapper, init_gfs_wrapper, init_ocean_wrapper, init_bdy_wrapper, relocate_wrapper, unpost_wrapper, forecast_wrapper, post_wrapper, products_wrapper

2. Add in launcher_wrapper: pom.gfssst_type=1, prelaunch.basin_overrides=no, config.run_gsi=yes, gsi_d02_nml.HYBENS_REGIONAL=F, gsi_d03_nml.HYBENS_REGIONAL=F. Run the wrappers: launcher_wrapper, init_gfs_wrapper, init_ocean_wrapper, init_bdy_wrapper, relocate_wrapper, gsi_d02_wrapper, gsi_d03_wrapper, merge_wrapper, unpost_wrapper, forecast_wrapper, post_wrapper, products_wrapper.

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