Werid sst values near coastline in wrflowinp files using OISST data

[bwendu]

hello everyone, i want to use oisst data to run my case, but i'm confused by something. hope for any help or suggestions
i use NCL to make intermediate SST data files,like OISST:2021-07-21_00 ... , I made succesfully and run metgrid.exe and real.exe, i also get wrflowinp files, but SST field looks werid near coastline (attach fig)
another little question is: OISST data is once a day at 12:00, i think sst will update once a day in wrflowinp file, but when i run WPS , i need 4 times data at 00,06,12,18 everyday, so i use ncl to make everyday's four time sst data are the same except time stamp (maybe this way is reasonable or not ?)

the NCL code i use also in attach figs

 

[kwerner]

Hi,
Do your input data include a LANDSEA mask? Take a look at Ming's post here. This thread is specific to GFS input, but it's possibly the same issue.

 

[bwendu]

Hi,
Do your input data include a LANDSEA mask? Take a look at Ming's post here. This thread is specific to GFS input, but it's possibly the same issue.

Thank you very much for your prompt reply. I indeed did not include a LANDSEA mask in the intermediate files generated myself before. After carefully reading and referencing the discussion between Ming and Tyler, I made small modifications to my METGRID.TBL:
========================================
name=SST
# interp_option=sixteen_pt+four_pt
# fill_missing=0.
# missing_value=-1.E30
# flag_in_output=FLAG_SST
interp_option=sixteen_pt+four_pt+wt_average_4pt+search
# interp_mask=LANDSEA(1)
masked=land
fill_missing=0.
# missing_value=-1.E30 # OISST, using sst_update = 1
missing_value=-32767 # OISST
flag_in_output=FLAG_SST
========================================
I previously specified an incorrect missing_value, which likely led to erroneous interpolation.

Additionally, for a quick test, I used the same intermediate file that lacks LANDSEA mask information but commented out interp_mask=LANDSEA(1). The resulting met_em_d0* files now contain reasonable SST values

maybe i avoid the earlier error by mistake
but I will regenerate the intermediate files with a proper LANDSEA field included soon

thank you very much
bowen

 

[kwerner]

That's great! I'm so glad you were able to get it working. Thanks for letting us know.