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Module when rewriting QFX

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Hello. I am looking for a way to change the evaporation of seawater. So I want to rewrite the variable QFX. In ./phys, what is the name of the module that should be changed.
QFX is found in many different physics modules. It may help if we knew which schemes you are interested in using. You could attach your namelist.input file, for e.g.
I want to use.

mp_physics = 10,
ra_lw_physics = 1,
ra_sw_physics = 1,
radt = 10,
sf_sfclay_physics = 1,
sf_surface_physics = 2,
bl_pbl_physics = 1,
bldt = 0,
cu_physics = 1,
cudt = 0,
isfflx = 1,
ifsnow = 0,
icloud = 1,
surface_input_source = 1,
num_soil_layers = 4,
sst_update = 1,
sst_skin = 1,
Thanks. The surface layer scheme is responsible for water surface fluxes, and it provides these to the PBL scheme and the LSM. Your surface layer option is the Revised MM5 scheme (sf_sfclay_physics = 1). The file for this is module_sf_sfclay.F. Your PBL scheme is YSU (module_bl_ysu.F), and your LSM is Noah (module_sf_noahlsm.F and module_sf_noahdrv.F). You may also need to make some modifications in the surface driver (module_surface_driver.F).
Thank you very much. I will be saved.
I want to change module_sf_sfclay.F, but I can't find lTIMESTEP. How can I add a time variable?
Perhaps you can find the variable in another surface physics module and use that as a guide to modify module_sf_sfclay.F.