TL module updates for aircraft-level/user-defined-level upward/downward radiance

[chengdang]

TL module updates for the following new features have been added to branch: https://github.com/JCSDA/CRTMv3/tree/feature/cd_AirCraft_TL

• aircraft-level upward radiance
• user-defined-level downward radiance

Besides these updates, I also included a lot of comments for the ADA module in general for future reference.

[chengdang]

These updates are built upon PR #179, and should be tested after merging this PR first.

[chengdang]

Note 1:
The computed radiance TL is assigned within module CRTM_ADA_TL,

CRTMv3/src/RTSolution/ADA/ADA_Module.f90

Line 1623 in 1a8cd44

! Assign radiance TL

while for the forward calculation, the radiance is assigned within Assign_Common_Output

CRTMv3/src/RTSolution/Common_RTSolution.f90

Line 1192 in 617b7c1

! The output radiance at TOA or at Aircraft height

This is because the TL profiles are not stored in any data structure for TL modules to use outside of CRTM_ADA_TL

[chengdang]

Note 2:

The output of CRTM_ADA_TL is changed into a new variable s_rad_TL , which can be either upward/downward radiance TL

CRTMv3/src/RTSolution/ADA/ADA_Module.f90

Line 1286 in 1a8cd44

s_rad_TL) ! Output TL radiance

The original output variable s_rad_up_TL is kept as a local variable in CRTM_ADA_TL

The computed TL results are identical compare to the dev branch. (TOA only)

[chengdang]

Note 3:

Several ctests have been added/updated to test the model updates:

CRTMv3/test/CMakeLists.txt

Line 252 in 1a8cd44

list( APPEND TLAD_tests

CRTMv3/test/CMakeLists.txt

Line 203 in 1a8cd44

list( APPEND Aircraft_Sensor_Ids

CRTMv3/test/CMakeLists.txt

Line 210 in 1a8cd44

list( APPEND Downwelling_Radiance_Sensor_Ids

For now the tests run as expected.

[chengdang]

Note 4:

It is unclear if the TL module updates are scientifically correct, more scientific tests/code review are needed from the team.