The Hiaper Atmospheric Radiation Package (HARP) made its first flight on the NCAR HIAPER aircraft during the PACDEX mission of April and May of 2007, measuring upwelling and downwelling solar spectral irradiance as well as actinic flux. The combination of spectral irradiance, actinic flux, and a host of in situ measurements enables the simultaneous investigation of aerosol and cloud properties and their effects on important radiative quantities like flux divergence and single scattering albedo. For example, flights across the Pacific ocean encountered several examples of high pollution (as identified by elevated black carbon and carbon monoxide levels) encountered both in and out of clouds. Of particular interest are clouds with elevated levels of black carbon where multiple scattering (especially in the case of internal mixing) is thought to enhance absorption. We examine the solar radiative changes associated with pollution plumes with emphasis on the effects of black carbon on clouds and the clear sky.
AGU Fall Meeting Abstracts
- Pub Date:
- December 2007
- 0305 Aerosols and particles (0345;
- 0319 Cloud optics;
- 0320 Cloud physics and chemistry