Dear all, 

I am trying to compute Evapotranspiration (Eto)

According to instructions it is that the three components of the total ETo are as follows:

- variable "Evaporation from bare soil" ,
- variable "Evaporation from open water surfaces excluding oceans,
- variable "Evaporation from vegetation transpiration",


So, to compute ETo I am adding the 3 components. 

I have a mix of negative and positive values, and I thought ETo should be 0 - 1 

Am I missing something

Would appreciate a reply asap

Many Thanks for the attention

Kind Regards

Joana

5 Comments

  1. Joseph Janssen

    I am having similar issues with the Total Evaporation variable.

  2. Joseph Janssen

    From documentation of Evaporation: "The ECMWF Integrated Forecasting System convention is that downward fluxes are positive. Therefore, negative values indicate evaporation and positive values indicate condensation."

  3. emmanuel kamla fotsing

    Dear all, 

    I would like to know how to calculate Potential Evapotranspiration from the variables  "Evaporation from bare soil" ,
     "Evaporation from open water surfaces excluding oceans, and  "Evaporation from vegetation transpiration"?  Does this way of calculating potential evapotranspiration coincide with the one given by Penman-Monteith?  And finally, how to calculate the actual or current evapotranspiration?

    Kind regards

    Emmanuel.

  4. Michela Giusti

    Hi,

    please have a look at the following link for details:

    ERA5-Land: data documentation#Guidelines

    Regards

    Michela

  5. Aymn Elhaddad

    Hi,

    I am trying to find the difference in the calculation approach of the different era5 evaporation products , specifically products id 182 and 260259.


    Best.

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