WRF-BEM/BEP, why is the CM_AC_URB3D (AC consumption) all zero?

[Tony]

Dear ALL,

I was runing a WRF case with BEM/BEM (sf_urban_physics = 3) with LCZ maps. attached is the namelist.input.

I am relatively new to this module and Could anyone kindly look at it and tell me which of configurations is wrong? Thanks.

 

[Ming Chen]

Hi Tony,
There are a few issues in your case:
(1) for delx =3km, please turn off cumulus scheme, i.e., cu_physics =0
(2) please check the value of num_land_cat in your met_em file, then use this value in namelist. I believe the current value you set (=41) is not correct
(3) Which version of WRF are you running? If it is older version, please switch to WRVV4.5.1

 

[Tony]

Hi Tony,
There are a few issues in your case:
(1) for delx =3km, please turn off cumulus scheme, i.e., cu_physics =0
(2) please check the value of num_land_cat in your met_em file, then use this value in namelist. I believe the current value you set (=41) is not correct
(3) Which version of WRF are you running? If it is older version, please switch to WRVV4.5.1

Hi Ming, thanks for your reply.

I will run a case with cu_physics=0, thanks for noticing.

As for (2) and (3), I am running the WRF V4.4 with the local climate zone (LCZ) land cover data. according to the LCZ tool (WUDAPT to WRF – World Urban Database), I have to set the num_land_cat to 41 because the land cover data used have 41 classes indeed.

I wonder if it's because the cumulus scheme? or because the LCZ land cover data is used which has 41 classes?

Best,
Tony

 

[Ming Chen]

Tony,

I believe the LCZ category is an issue here. This is because the urban local climate zone (LCZ) numbers of 31-41 overlap with NLCD land categories, which may cause errors. For more details, please see

Bug fix: Update urban LCZ number in parameter tables by cenlinhe · Pull Request #1786 · wrf-model/WRF

Update urban LCZ numbers in parameter tables to avoid overlapping with existing NLCD land types. TYPE: bug fix KEYWORDS: urban, LCZ, parameter table SOURCE: Cenlin He (NCAR) This addressed the issu...

github.com

 

[htan2013]

Hi Tony, you turn on the air conditioning switch in URBPARM_LCZ.tbl?

#
# SW_COND: Air conditioning switch, 1=ON
# (sf_urban_physics=3)
#
SW_COND: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0

 

[Tony]

Tony,

I believe the LCZ category is an issue here. This is because the urban local climate zone (LCZ) numbers of 31-41 overlap with NLCD land categories, which may cause errors. For more details, please see

Bug fix: Update urban LCZ number in parameter tables by cenlinhe · Pull Request #1786 · wrf-model/WRF

Update urban LCZ numbers in parameter tables to avoid overlapping with existing NLCD land types. TYPE: bug fix KEYWORDS: urban, LCZ, parameter table SOURCE: Cenlin He (NCAR) This addressed the issu...

github.com

Dear Ming,

Thanks for your patient reply.

Now i am using WRF V4.5.1, with 61 category-LCZ data and BEP/BEM scheme. Also with additonal Run-Time I/O Option for those variables.

It seems those variables including CM_AC_URB3D now can be generated normally.

Thanks,

Best,
Tony

 

[Tony]

Hi Tony, you turn on the air conditioning switch in URBPARM_LCZ.tbl?

#
# SW_COND: Air conditioning switch, 1=ON
# (sf_urban_physics=3)
#
SW_COND: 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0

Yes. I comfirmed they are all set to 1. Thanks for noticing.