Scheduled Downtime
On Friday 21 April 2023 @ 5pm MT, this website will be down for maintenance and expected to return online the morning of 24 April 2023 at the latest

Unreasonable ground heat flux at lake grids

This post was from a previous version of the WRF&MPAS-A Support Forum. New replies have been disabled and if you have follow up questions related to this post, then please start a new thread from the forum home page.


New member
Hello, WRF team

I am using wps-4.1 and wrf-4.1 for a two nest long simulation (~one year).

I have a problem with ground heat flux at lake grids. I used Unified Noah land-surface model for simulation, and the results show that GRDFLX of once frozen lake grids will always have a constant value when it back to water body (the GRDFLX of not frozen water grids are zero in default).

In addition, I used sst_update=1, does the GRDFLX problem affect the simulation results (other variables such HFX, LH, RAINNC...) ? How can I solve this problem?

Due to the wrfout files are too large for the whole year, I have attached the figures of results (in Flux.docx). There are also several typical wrfout in google drive (




  • namelist.wps
    985 bytes · Views: 25
  • namelist.input
    2.7 KB · Views: 29
  • Flux.docx
    381.4 KB · Views: 17
This prolbem have been solved in

Thanks for WRF team!