what is the difference between mm/s and mmH20/s

[dayon]

Dear scientists of NCAR:
the output variables of CESM, such as
float QFLX_EVAP_TOT(time, lat, lon) ;
QFLX_EVAP_TOT:long_name = "qflx_evap_soi + qflx_evap_can + qflx_tran_veg" ;
QFLX_EVAP_TOT:units = "mm H2O/s" ;
float QSOIL(time, lat, lon) ;
QSOIL:long_name = "Ground evaporation (soil/snow evaporation + soil/snow sublimation - dew)" ;
QSOIL:units = "mm/s" ;

(1) What is the difference of units between mm/s and mmH20/s?
(2) What is the difference of the calculation level between PATCHS and PFTS?

Thanks for your time, and any suggestions are highly appreciated.

 

[oleson]

1) They are the same units (mm of water per sec, or kg per m squared per sec).
2) Patches are just another word for pfts. Calculations done at the patch level are essentially being done at the pft level.

 

[dayon]

Thanks, oleson. Your responses are always impressive.