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how WRF computes PBLH?

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I know that there are different methods to compute the PBLH, but I don’t know how WRF computes the PBLH.
I read somewhere that it depends on the PBL scheme used. In my case, I am using the GBM.
Do you know how WRF computes PBLH, with that scheme?

Please take a look at the code phys/module_bl_gbmpbl.F, in which you can find the following piece of code:
       !     ---5--- Calculate the pbl height and length scale
       call pblhgt( &
            ! input variables &
       zqx,kts,kte, &
            nsquar,tke,presfl,rhoxfl,rcldb,exnerfl, &
            rttenx,thvx,thlx,thx,qwx,rexnerhl,qcx, &
            xfr,xlvocp,aone,atwo,rstbl,            &    
            ! output variables &
       bbls,pblx, &

subroutine pblhgt can also be found in the same code.