New cross sections, indices of refraction, and reflectance spectra of atmospheric interest

A brief review is presented of the indices of refraction and cross sections that are on the HITRAN 2004 compilation. New measurements of the refractive indices of ternary (H2O/H2SO4/HNO3) droplets by Myhre [2003,2005] and the indices of supercooled water by Wagner [2005] are presented and compared to previous data. New infrared cross sections of species of atmospheric interest (e.g., the measurements of HFC-125 and HFC-143a of Lonardo and Masciarelli [2000]) are also discussed. We finally propose to link to the “other listings” portion of the HITRAN web site several established reflectance data bases, since many current and future remote sensing experiments are influenced by ground emission and reflectance contributions. Outline of Presentation Discussion of new Indices of Refraction Cross sections Links to Digital surface reflectance atlases HITRAN 2004 Refractive Indices Water, ice Sulfuric acid (stratospheric sulfate) Nitric acid Solid hydrates (NAM, NAD, NAT) nitric acid mono, di, tri hydrate Ternary solution droplets (H2SO4, H2O, HNO3) Tropospheric (sodium chloride, sea salt, ammonium sulfate, organic soot, quartz, sand) Supercooled Water Motivation Pure water – 10 m drop nucleates at -38° C Pruppacher and Klett, Microphysics of Clouds and Precipitation, p213, 1998 Water droplet + desert dust nucleates at -15° C (Sassen, Nature, 434, p456, 2005) Pure water supercooling (°C) Drop Diameter (cm) 10 m 30 40 Supercooled Water Indices 1.0 1.1 1.2 1.3 1.4 1.5 1.6 100