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Can I use eca_pd operator with 3h precipitation amounts as an input file instead of daily precipitation amounts?

Added by Rilka Valcheva about 4 years ago

Dear CDO users,

I have data in netcdf format with 3h precipitation amounts. I would like to count the number of cases above a given threshold, let say 5 mm per 3h.
Can I use cdo eca_pd operator with 3h precipitation amounts as an input file instead of daily precipitation amounts?

cdo eca_pd,5 input.nc output.nc

Thank you in advance.

Best regards,
Rilka


Replies (3)

RE: Can I use eca_pd operator with 3h precipitation amounts as an input file instead of daily precipitation amounts? - Added by Ralf Mueller about 4 years ago

hi Rilka!

AFAIK the operator expects daily data in order to compute in order to compute Precipitation days index per time period. Technically you can use 3h-data, too. but the operators till works as if your 3-hourly input is daily input.

I am not 100% sure what you want tbh. If you still want to get precipitation days you need to accumulate the 3-hourly data into daily data (cdo -daysum is the way to go). In case you want to compute the number of consecutive 3-hourly-rain, you can use your input as-is.

hth
ralf

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