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Updated and user defined GHG concentrations for RRTMG#1071

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thomasuhoh wants to merge 2 commits into
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thomasuhoh:user_defined_GHG_concentrations
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Updated and user defined GHG concentrations for RRTMG#1071
thomasuhoh wants to merge 2 commits into
MPAS-Dev:developfrom
thomasuhoh:user_defined_GHG_concentrations

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@thomasuhoh
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This PR updates the initial GHG concentrations in RRTMG SW+LW to more recent values. In addition, the user can specifiy the values by setting co2_content, n2o_content, and ch4_content to the desired values in the physics section of namelist.atmosphere.
New default values are 410 ppmv for CO2, 330 ppbv for N2O, and 1850 ppbv for CH4.

@jihyeonjang
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I am so sorry it took so long to review this PR. While reviewing another PR (#1173), I noticed that it is related to this one, so I'd like to ask a couple of questions.

Could you explain why the volume mixing ratio in module_ra_cam_support.F was changed from 355.e-4 to 359.e-4? Is this change related to the update of co2_content from 379ppmv to 410ppmv in RRTMG SW/LW?

Thank you.

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