Hello

I once read about this issue but I don't have extensive experience in it

You can visit the links here and I hope to help you

Good luck

http://bwc.berkeley.edu/Amflux/equations/Gretchen-latent-heat-flux.htm

http://www.fao.org/docrep/x0490e/x0490e04.htm

http://edis.ifas.ufl.edu/pdffiles/ae/ae45900.pdf

http://www.colorado.edu/geography/class_homepages/geog_3511_s11/notes/Notes_9.pdf

You can easily relate between the two of them with the latent heat of vaporization. It is a simple unit conversion problem. 

Make sure you use the correct density of water!

Could you elaborate your question? Which methods do you know so that it is clear to provide an alternative method for ET estimation?

Read the Bown ratio that will help you..:-)

Elijah Phiri: I am estimating evapotranspiration (ET) from remote sensing model based observations and I want to compare it with latent heat derived derived ET estimates.

Saseendran S Anapalli: how will get the estimates of Latent heat flux from a vegetated surface and latent heat of evaporation of water.

Saseendran S Anapalli

If possible, Can you share a sample calculation to convert Latent heat flux to evapotranspiration with Eddy Covariance systems.

Saseendran S Anapalli

You need to divide the Le, which should be in an energy unit such as W/m-2 by the latent heat of evaporation (i.e. the amount of energy required to evaporate 1g or 1ml of water) which is 2257 J/g . For example, if you have a total LE of 500 W/m-2 for one hour this would be 1800 000 J of energy (with watts equal to jouls per second). Enough to evaporate 798 g of water per m-2 (1800000/2257). This is equal to 0.798 mm of evaporation (1 kg H20 per m-2 = 1 mm). Good luck with the conversion!

Joss Ratcliffe Hey, thank you for the conversion calculation, did you write or is there maybe a paper where this is described? I am doing a validation of RS data with fluxnet. Searched for a while but can't find it. Would like to read it.

And is it really this easy or is a more variable calculation better based on air temperature or something I saw here: https://earthscience.stackexchange.com/questions/20733/fluxnet15-how-to-convert-latent-heat-flux-to-actual-evapotranspiration