jyangdas@gmail_com
Member
To Whom It May Concern, When I read the code of RRTMG in CAM5, I found the absoprtion coefficient tables are for the ranges of air pressure ~0.01 mbar to 1 bar and of air temperature of T(MLS)-30 K to T(MLS)+30 K. T(MLS) is the standard midlatitude summer temperature profiles with a near-surface value of 294 K. My understanding is that the temperature range supported by RRTMG therefore is 264 K to 324 K at the surface. For the same reason, if T(MLS) at 50 hPa is 200 K, the range supported by RRTMG is 170 K to 230 K at this level. When the temperature is out of the range, the absorption coefficient is set to be equal to the nearest one in the table. Is my understanding correct? Moreover, if you know the ranges of CO2, CH4, H2O mixing ratio supported by the model, could you tell me? I am working on certain extreme climates, such as the very cold climate during a snowball earth glaciation and the very hot climate after the deglaciation, so these messages are very important for me. Thank you very much for your patient and your time!