Why the simulated temperature at 2 m is too low on lake and ocean

[LYM]

Dear everyone,

I am a new user of WRF model. Recently I compare my wrfout result with the observations and find that the simulated temperature at 2 m is too low on lake and ocean. Do you know why? Thanks very much for your advice and help!
The distribution of temperature at 2 m over the domain is as followed (this figure is at 19 UTC, about 14 pm on June 7th, 2021 and the unit is Celsius):

Please find attached files for my namelist.wps and namelist.input. Much appreciated for your help!

Best wishes,
Lingyun

 

[haiqingsong]

Dear everyone,

I am a new user of WRF model. Recently I compare my wrfout result with the observations and find that the simulated temperature at 2 m is too low on lake and ocean. Do you know why? Thanks very much for your advice and help!
The distribution of temperature at 2 m over the domain is as followed (this figure is at 19 UTC, about 14 pm on June 7th, 2021 and the unit is Celsius):
View attachment 10895
Please find attached files for my namelist.wps and namelist.input. Much appreciated for your help!

Best wishes,
Lingyun

What is your forcing？GFS or FNL？

 

[LYM]

What is your forcing？GFS or FNL？

I use GFS4 to force WRF. Thanks!

 

[LYM]

What is your forcing？GFS or FNL？

Dear haiqing,

I look at the SST stored in wrflowinp_d01:

The SST on lake and ocean are low, too. But I don't know why the SST also exists on land. Do you think it is the reason why the simulated 2m temperature on lake and ocean is low? Thank you!