I found a discrepancy in ERA5-Land precipitation product. The monthly data is in theory the daily mean precipitation in meters per day. The problem is that when computing this from the hourly data the result is not the same value. I computed this for several months and grid-points, and I found in each case a discrepancy. Does anybody know why this discrepancy exists? Is there a problem/issue with the ERA5-Land product? If that is the case, which product is "correct"?
When I found this, looked for it on google and I only found this post: https://stackoverflow.com/questions/75698506/discrepancy-in-data-on-total-precipitation-from-era5-monthly-vs-daily-data
There another person got the same discrepancy, then in the comments, another researcher got also the mismatch in the precipitation values.
Hi,
Did you use the forecast (FC) or reanalysis (SFC) data for the hourly values? (I think accumulated precipitation has not always been available in the SFC data, so if you downloaded it a while ago you may have FC data)
The difference could also stem from the interpolation scheme, see https://confluence.ecmwf.int/display/UDOC/Differences+for+total+precipitation
Best,
Hi,
I use the ERA5-Land product and compare the hourly data with the monthly data of the same product ERA5-Land. This is a reanalysis, there is no forecast. I downloaded the data (monthly and hourly) two weeks ago. In theory, these datasets must be equivalent since one is the monthly mean of the other. See: https://essd.copernicus.org/articles/13/4349/2021/
Best,
Santiago
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