Help - Attenuation Correction without KDP calculation

#1

Hello LROSE users,

I am reaching out to see if someone can assist me.

I have been trying to test the attenuation correction of DBZ using the RadxKdp tool. However, it seems mandatory to perform the KDP estimation before applying the correction. I am wondering if it is possible to skip this step, as I already have .nc files that include the KDP values. I believe it would not be appropriate to estimate parameters to generate a KDP that is “similar enough” to the already estimated values.

I would greatly appreciate any guidance if this option exists. I have reviewed the parameter files, but it is unclear to me whether skipping the KDP estimation is feasible.

Thank you in advance for your help!

#2

Hello,

My apologies for the delay in responding.

Which version of LROSE are you using? My understanding is that RadxKdp assumes that KDP needs to be calculated. However, newer versions of RadxPid and RadxRate allow a user to provide a pre-existing KDP field that will be used - both of those applications can calculate the attenuation correction for DBZ and ZDR.

However, I could see it being useful to not have to run PID and QPE when it’s not needed and still be able to calculate attenuation. I’ll reach out to the software engineers to get their thoughts.

Thanks,
Jen