latent heat nudging (LHN) using 3DVAR

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imaiello_1983
Posts: 2
Joined: Wed Sep 26, 2018 8:52 am

latent heat nudging (LHN) using 3DVAR

Post by imaiello_1983 » Wed Sep 26, 2018 8:55 am

Dear all,

I have a question:
is the LHN implemented into WRF/WRFDA?

I should have assimilate using WRF-3DVAR the vertical profile of latent heat retrieved from radar or rainfall data.
So I have to main problems:

1) probably write an algorithm to retrieve the vertical profile of latent heat from radar or rainfall data
2) and then, assimilate this profile into WRF-3DVAR.

I know that there is both a spectral nudging and an observation nudging into WRF,
could they help me?

I hope in your answer,
best regards
Ida Maiello

lkugler
Posts: 16
Joined: Fri Aug 17, 2018 11:30 am
Location: Vienna

Re: latent heat nudging (LHN) using 3DVAR

Post by lkugler » Sun Feb 17, 2019 11:34 am

Hi Ida,
I have not seen an open-source LHN algorithm for WRF so far, but HRRR seems to have one (as described here: https://rmets.onlinelibrary.wiley.com/d ... 02/qj.3179).

Best regards,
Lukas
Lukas Kugler, PhD student / University of Vienna

imaiello_1983
Posts: 2
Joined: Wed Sep 26, 2018 8:52 am

Re: latent heat nudging (LHN) using 3DVAR

Post by imaiello_1983 » Thu Feb 21, 2019 10:16 am

Dear Lukas,

thank you so much for your response and for suggesting a very interesting article for me involved into radar data assimilation for 10 years!

Do you know something about FDDA (four-dimensional data assimilation), also know as nudging, implemented into WRF?

https://nar.ucar.edu/2018/ral/real-time ... g-advances


Best regards,
Ida

JakeLiu
Posts: 14
Joined: Fri Jun 08, 2018 8:29 am

Re: latent heat nudging (LHN) using 3DVAR

Post by JakeLiu » Mon Feb 25, 2019 5:06 am

Any nudging is done through model integration, not in 3DVAR.
Jake

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