Open BaptisteVandecrux opened 3 years ago
From: Alex Kokhanovsky Sent: 7. januar 2021 09:44 To: Baptiste Vandecrux Subject: Re: Asymmetry parameter and backscatter fraction
please, use the formulation as in our 2020 paper
On Wed, 6 Jan 2021 at 08:30, Baptiste Vandecrux wrote: Thank you Alex. I see in the fortran code that you calculate the atmospheric transmittance as: wa1=1.10363 wa2=-6.70122 wx0=2.19777 wdx=0.51656 bex=exp ( (g-wx0)/wdx ) sssss= (wa1-wa2)/(1.+bex)+wa2 t1=exp(-(1.-g)*tau/am1/2./sssss Since t1 is defined in Eq. A9 and A10 of Kokhanovsky et al. (2020) as: t1=exp(-Batm*tau/am1) where Batm is the atmospheric backscattering coefficient. It means that your formulation implies: Batm = (1.-g)/2./sssss Surprisingly, this approximation of Batm do not match with the definition of Batm given in Kokhanovsky et al. 2020: The difference is striking: Could you check whether the approximation is accurate? Best, Baptiste
On Wed, 6 Jan 2021 at 08:30, Baptiste Vandecrux wrote: Thank you Alex. I see in the fortran code that you calculate the atmospheric transmittance as:
wa1=1.10363 wa2=-6.70122 wx0=2.19777 wdx=0.51656 bex=exp ( (g-wx0)/wdx ) sssss= (wa1-wa2)/(1.+bex)+wa2 t1=exp(-(1.-g)*tau/am1/2./sssss
Since t1 is defined in Eq. A9 and A10 of Kokhanovsky et al. (2020) as:
t1=exp(-Batm*tau/am1)
where Batm is the atmospheric backscattering coefficient. It means that your formulation implies:
Batm = (1.-g)/2./sssss
Surprisingly, this approximation of Batm do not match with the definition of Batm given in Kokhanovsky et al. 2020:
The difference is striking:
Could you check whether the approximation is accurate?
Best, Baptiste
From: Alex Kokhanovsky Sent: 7. januar 2021 09:44 To: Baptiste Vandecrux Subject: Re: Asymmetry parameter and backscatter fraction
please, use the formulation as in our 2020 paper