I realized the ERA5-land precipitation is accumulated, while ERA5 is not. That’s why the values are so different. I found this table on how to convert into hourly precipitation for ERA5-land, but I have one question about how to process at 00UTC. Does anyone have an answer? Thank you!
Hi, for ERA5-Land hourly data, the value at 00UTC gives the total for the previous day e.g. 00 UTC on 2nd Feb 2025 will give the total precipitation for 01 Feb 2025 (in mm).
Hi Kevin, thank you for your reply! My following question will be the times in the netcdf for ERA5-land actually indicate the end of each accumulated hour after the following the conversion equation (tp equation above). For example, 01 UTC in ERA5-land indicates the accumulated precipitation from 00UTC to 01UTC. For ERA5, however, the times in the netcdf file indicate the beginning of each accumulated hour. For example, 01UTC in ERA5 indicates the accumulated precipitation from 01UTC to 02UTC, 00UTC indicates accumulated from 00UTC to 01UTC. So that there is one hour shift between ERA5-land and ERA5 for the times in the netcdf files. Am I correct? Please help me clarify this information, which is very important for my following study. Thank you very much!
Fang
Hi Fang,
No, in both cases for accumulations, the time represents the end of the time boundary e.g. 02UTC in ERA5-Land woud be the accumulation between 00 UTC and 02 UTC, while for ERA5 it would be the accumulation in the previous hour (e.g. between 01UTC and 02 UTC).
Kevin
Got it, Kevin! Thank you very much for your clarification!