How POP handles land in his SST calculations？

[kwzhang]

Dear all,

I am confuesd about how POP handles land in his SST calculations. I am using B1850 from CESM2.1.3.

I check o2xavg_So_t, which is the SST passed by POP to CPL. I found the value on land as well at 273.15K (see the Fig below).

I checked the code in the ocn_import_export.F90 file for POP passing SST to CPL. Does the code have the land set to 273.15K in SBUFF_SUM(i,j,iblock,index_o2x_So_t)?

Look forward to any useful suggestion.

Best regards,
KW

!-----------------------------------------------------------------------
!
!     convert and pack surface temperature
!
!-----------------------------------------------------------------------

   n = 0
   do iblock = 1, nblocks_clinic
      this_block = get_block(blocks_clinic(iblock),iblock)
      do j=this_block%jb,this_block%je
      do i=this_block%ib,this_block%ie
         n = n + 1
         o2x(index_o2x_So_t,n) =   &
             SBUFF_SUM(i,j,iblock,index_o2x_So_t)/tlast_coupled + T0_Kelvin
      enddo
      enddo
   enddo