LBLRTM v12.10 Clear Sky Radiance at extremely low VZA

[rbantges]

Hi - I'm trying to use LBLRTM to calculate the clear sky radiance for a VZA = 84.345 degrees (hence angle is set at 95.655 in the TAPE5 below). However, I receive the following error:
"ERROR - FSCGEO"

LBLRTM v12.10 (compiled using Intel Fortran Compiler v2017 - both single and double precision versions give the same error).
AER v3.8 line file
Running on Oracle Enterprise Linux 7 (64 bit).
Please let me know if you require any additional info.

I can calculate the radiances (or layer optical depths) for VZA = 0.0, 16, 36, 55 and 72 without any issues.
I want to be able to compare the LBLRTM radiances at these angles with another RT code for a validation exercise. Please can you advise how I can calculate the radiances for such a low angle? If it's not possible, what is the limitation and how does this impact the ability to accurately calculate fluxes?

Many thanks in advance.

TAPE5 below:

$ TAPE5 generated for TRP STD Atmos., Dec 18 16:33:47 2020 UTC
HI=1 F4=1 CN=5 AE=0 EM=1 SC=0 FI=0 PL=0 TS=0 AM=1 MG=0 LA=0 OD=0 XS=0 00 00
50.0000 1650.0000 4.000E+00 0.000E+00 4.000E-02 3.600E+01 2.000E-04 1.000E-03 0
2.997E+02 1.000E+00
1 2 0 0 0 7 0 0 0 0.000 120.000
120.000 0.000 95.655
0.000 0.000 0.000 0.000 0.000
%%%%%

[pernak18]

@kcadyper can you help out @rbantges? please and thanks

[kcadyper]

Hi,

Thanks for your interest in LBLRTM. I have some idea of what is going wrong, but I would like to run some tests. Please send me (kcadyper@aer.com) the TAPE5 as a file, so that I don't need to reformat it.

Karen

[pernak18]

all: can this issue be closed?

[drbel8]

all: can this issue be closed?

would it be possible to know how was this solved?