How to calculate PET from clm output

[xiaoxiaokuishu]

Hi, all,
I have checked the output vars of clm, but did not find PET or even VPD. Maybe I have to calculate by myself, but seems a little bit unclear.
According to the below paper, we can get Rn (not directly, but can be calucated use other radiation-realted variables), es and ea requires the mean, max
and min (seems there are avaliable tmax and tmin from CLM), the trouble come from u2, we can only get u10 from clm, is there anyway to get u2 or other possible
method to get PET from CLM?

 

[xiaoxiaokuishu]

Hi, all,
I have checked the output vars of clm, but did not find PET or even VPD. Maybe I have to calculate by myself, but seems a little bit unclear.
According to the below paper, we can get Rn (not directly, but can be calucated use other radiation-realted variables), es and ea requires the mean, max
and min (seems there are avaliable tmax and tmin from CLM), the trouble come from u2, we can only get u10 from clm, is there anyway to get u2 or other possible
method to get PET from CLM?

View attachment 5102

sorry for that, I just notice how to get the u2 from u10, now the question about how to get es and ea, it seems it requried the dew temperature,
but the key point is we can not get VPD from the CLM output, if so, then i do not need to calcuate es and ea then get VPD. Besides, i use CLM/sp mode.

Best