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Atmospheric Composition

Project Summary: In Situ Measurements of Aerosol Size Distributions: Satellite Validation and The Response and Effects of Atmospheric Aerosols on Global Change. We propose: (i) to make in situ aerosol size distribution measurements in the tropical upper troposphere and lower stratosphere to better understand transport and formation of the aerosol entering the stratosphere; (ii) to make measurements that will be of use in validating satellite sensors that NASA is flying or planning to fly and (iii) to develop and fly a light and compact instrument which will permit study of chemical composition of the upper tropospheric (UT) and lower stratospheric (LS) aerosol. We will report the detailed size distributions in the diameter range from 4 nm to 1000 nm and integrated parameters such as aerosol number, surface and volume concentrations. These measurements and analyses support NASA’s interest in (1) studying atmospheric processes responsible for the destruction of ozone in the stratosphere and (2) studying processes governing the formation, transport and transformation of aerosol in the UT/LS. These measurements will be made in the TC4 missions and related missions such as those to be flown with the Global Hawk Unmanned Aerial System (UAS). We also propose to develop a compact and light airborne instrument to determine the chemical composition of aerosol particles in the UT/LS. These measurements will assist in understanding the aerosol chemistry observed in the upper troposphere and lower stratosphere. The proposed instrument will permit determine particles to identified as sulfate, organic or soot depending upon measured physical diameter, real refractive index, complex refractive index, density and aerodynamic diameter. The proposed airborne measurements of aerosol size distributions and aerosol chemistry will also contribute to the validation of NASA satellites intended for the study of atmospheric composition and climate.

Project PI: James Wilson/University of Denver

University of Denver Clarence M. Knudson Hall, Room 200 Denver, CO

Phone: (303) 871-3002

E-mail: jwilson@du.edu

http://www.engr.du.edu/aerosol/index.htm

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Started: Aug 09, 2010

Last Activity: Mar 14, 2011

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