A52D-08
Aerosol and cloud radiative forcings derived by CALIPSO and CloudSat satellite observations
Friday, 18 December 2015: 12:05
3004 (Moscone West)
Eiji Oikawa, NIES National Institute of Environmental Studies, Ibaraki, Japan, Kentaroh Suzuki, Atmosphere and Ocean Research Institute University of Tokyo, Tokyo, Japan, Teruyuki Nakajima, JAXA Japan Aerospace Exploration Agency, Sagamihara, Japan and Tomoaki Nishizawa, National Institute for Environmental Studies, Tsukuba, Japan
Abstract:
The aerosol direct effect occurs by direct scattering and absorption of solar and thermal radiation. Shortwave direct aerosol radiative forcing (SWDARF) under clear-sky condition is estimated about 5 Wm-2 from satellite retrievals and model simulations [Yu et al., 2006ACP]. Simultaneous observations of aerosols and clouds are very limited, thus it is difficult to validate the estimation of SWDARF under cloudy-sky condition. Recently, the global vertical distributions of aerosols and clouds are retrieved by the measurements of CloudSat and CALIPSO satellites. Oikawa et al. [2013JGR] used CALIPSO and MODIS data in order to evaluate the SWDARFs in four scenarios: clear-sky condition, the case that aerosols exist above clouds, the case that aerosols exist below high-level clouds, and the case that aerosols are not detected by CALIOP in cloudy-sky condition. Over Atlantic Ocean off southwest Africa, biomass burning aerosols are transported above low-level clouds and cause large positive SWDARF [Oikawa et al., 2013JGR; Chand et al., 2009Nat. Geosci.; De Graaf et al., 2012JGR]. We investigate the change of aerosol and cloud radiative forcings depending on the vertical stratification of aerosols and clouds using CALIPSO and CloudSat observation data.
