GRIB-API definition

NameEvaporationAbbreviationevaUnitkg m-2paramId:260259

 

UERRA details

DefinitionMoisture flux from the surface into the atmosphere.
Validityaccumulated (from the beginning of the forecast)
CommentsBy model convention downward fluxes are positive. Positive evaporation represents condensation.

 

WMO GRIB2 definition

Parameter
Discipline0meteorological products
Parameter category1moisture
Parameter number79
evaporation rate
Type of statistical processing1accumulated
Level
Type of first fixed surface1ground or water surface
Scale factor of first fixed surfaceall bits to 1missing
Scaled value of first fixed surfaceall bits to 1missing
Type of second fixed surfaceall bits to 1missing
Scale factor of second fixed surfaceall bits to 1missing
Scaled value of second fixed surfaceall bits to 1missing

7 Comments

  1. Proposed parameter number equal to 79 (evaporation rate) follows the way the accumulated precipitation is defined (e.g. the cnmc uses such definition)

    In WMO there is defined also Evaporation (parameter number 6) [kgm-2]. It would be analogical to our proposal but with one key less needed (Is it the official WMO recommendation to use as few keys as possible?).

  2. we already have in the parameter database a parameter "e" evaporation with different units (m of water equivalent, which is a conversion factor of 10^^-3), paramid 182, and a bad grib2 discipline 192

  3. We need the correct units..

    My proposal is to follow the way how it is done in TIGGE/S2s for similar parameter total precipitation (228228)

  4. yes, what I mean is that you can not call it "e" because it already exists, not that you should change your units.

  5. the definition is similar to paramId 500039 but it is centre=cnmc

    Regarding the shortname, it will not be easy, I see many evaporation paramters wrongly named or wrongly shortnamed in the parameter db

  6. Yes please. Let's have a short meeting when Mladek is back