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AER-RC / LBLRTM

Line-By-Line Radiative Transfer Model by Atmospheric and Environmental Research
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Question about analytic Jacobians/derivatives #44

Open shuazicy12 opened 1 year ago

shuazicy12 commented 1 year ago

Hi, i‘ve obtained the total upwelling solar radiance successfully using the LBLRTM, now i am going to calculate the analytic Jacobians/derivatives of the solar radiance for desired parameters. So how to calculate the analytic Jacobians/derivatives for the total upwelling solar radiance? Since I've read the example code（run_example_analytic_jacobian）but i think it may be different from frequency band which i want （the example code calculate the band of 500-1174cm-1，but i use the 2900-3100cm-1 ). Thank you!

kcadyper commented 1 year ago

Hi,

Unfortunately it's not possible to get the AJs for the upwelling solar radiation directly from LBLRTM following the examples provided in the release. The AJ code was designed to provide derivatives with respect to a number of input parameters (surface properties,temperature, molecular amounts) of the total atmospheric radiation at the top or bottom of the atmospheric profile. It may be possible to use these derivatives to get the AJs for the reflected solar, but I need to think this over before I can say it is really possible. The frequency band is not a problem, changing it is trivial.