Does AOD value changes during wrf.exe process?

[little_grey]

Hi! I'm using WPS4.5 and WRF-Solar 4.5. I set aer_opt = 2, aer_aod550_opt = 1, aer_aod550_val = 0.12 in the namelist.input and run wrf.exe. I found that AOD5502D in all wrfout files is also 0.12. I have several questions:
(1) It seems that the value of AOD did not change at all during the process of wrf.exe. Does WRF or WRF-Solar model takes into account the interaction between aerosols and other meteorological factors (for example, wind speed, temperature, RH, …)? Or does it only consider the effect of AOD on radiation outputs, without considering other variables' effect on AOD?
(2) How does WRF-Solar calculate the effect of AOD on the radiation outputs(like SWDDNI, SWDDIR,SWDDIF) ? Is it based just on a linear relationship? I want to learn about the specific mechanism.
(3) If I set aer_aod550_opt = 2 and insert my own AOD files, will the value and distribution of AOD also remain unchanged during the wrf.exe?
Waiting for your answers. Thanks in advance!

 

[Ming Chen]

Please see my answers below:

Hi! I'm using WPS4.5 and WRF-Solar 4.5. I set aer_opt = 2, aer_aod550_opt = 1, aer_aod550_val = 0.12 in the namelist.input and run wrf.exe. I found that AOD5502D in all wrfout files is also 0.12. I have several questions:
(1) It seems that the value of AOD did not change at all during the process of wrf.exe. Does WRF or WRF-Solar model takes into account the interaction between aerosols and other meteorological factors (for example, wind speed, temperature, RH, …)? Or does it only consider the effect of AOD on radiation outputs, without considering other variables' effect on AOD?

WIth the options of aer_opt =2 and aer_aod550_opt = 1, AOD5502D will remain unchanged during the model integration. In this case only the AOD impacts on radiation is considered.

(2) How does WRF-Solar calculate the effect of AOD on the radiation outputs(like SWDDNI, SWDDIR,SWDDIF) ? Is it based just on a linear relationship? I want to learn about the specific mechanism.

I am not sure of this question. Hope someone in the wrf-solar community may have an answer.

(3) If I set aer_aod550_opt = 2 and insert my own AOD files, will the value and distribution of AOD also remain unchanged during the wrf.exe?
Waiting for your answers. Thanks in advance!

Yes you are right. In this case, your input data is time-varying, yet the AOD data won't be updated by WRF physics/dynamics.

 

[little_grey]

Please see my answers below:

WIth the options of aer_opt =2 and aer_aod550_opt = 1, AOD5502D will remain unchanged during the model integration. In this case only the AOD impacts on radiation is considered.

I am not sure of this question. Hope someone in the wrf-solar community may have an answer.

Yes you are right. In this case, your input data is time-varying, yet the AOD data won't be updated by WRF physics/dynamics.

Thanks for your reply. It helps me a lot. Hope someone in the wrf-solar community could explain the specific mechanism of this model in calculating the impacts of AOD on the radiation outputs.