[Bug] unit conversion is missing for TEMPO L2 V03 troposphric NO2 ObsError

[HyundeokChoi-NOAA]

Current behavior (describe the bug)

The converter doesn't convert the "tropospheric NO2 ObsError" unit from [molecules/cm2] to [mole/m2] for TEMPO level 2 version 03 product.

To Reproduce

What computer are you running on?
HERA
Steps to reproduce the behavior
Test with TEMPO level 2 version 03 product for tropospheric NO2.

Expected behavior

Additional information (optional)

            # error calculation:
            err = ncd.groups['product'].variables[err_name+'_uncertainty'][:].ravel()
            if self.v3:
                if self.columnType == "total" or self.columnType == "stratosphere":
                    sys.exit("no error with total and strato NRT product")
            else:
                err = err * conv * col_amf / tot_amf

[HyundeokChoi-NOAA]

Revised as below

            # error calculation:
            err = ncd.groups['product'].variables[err_name+'_uncertainty'][:].ravel()
            if self.v3:
                if self.columnType == "total" or self.columnType == "stratosphere":
                    sys.exit("no error with total and strato NRT product")
                else:
                   err = err * conv * col_amf / tot_amf
            else:
                err = err * conv * col_amf / tot_amf

[jeromebarre]

I remember correcting this before the TEMPO meeting. I think I forgot to PR my branch. Let me do this ASAP.

[HyundeokChoi-NOAA]

I saw you revised the "cld_fra", too. It was too strict.
Thank you!!

[jeromebarre]

No problems. For the cloud fraction 0.5 might then be a bit too loose. There is no real consensus as far as I can tell on the correct value. It really depends on your DA results after all. I suggest using something loose to remove the pixels that we know for sure will be bad at first and then use a QC filter to adjust during the DA.

[HyundeokChoi-NOAA]

I agree. Also, I would like to add "solar_zeneth_angle" to the MetaData which is recommended by TEMPO science team (< 70) so that we can use it as a filter during the DA.