A Closure Study of Total Scattering Using Airborne In Situ Measurements from the Winter Phase of TCAP
Berg, Larry K.
StatisticsView Usage Statistics
We examine the performance of our approach for calculating the total scattering coefficient of both non-absorbing and absorbing aerosol at ambient conditions from aircraft data. Our extended examination involves airborne in situ data collected by the U.S. Department of Energy's (DOE) Gulf Stream 1 aircraft during winter over Cape Cod and the western North Atlantic Ocean as part of the Two-Column Aerosol Project (TCAP). The particle population represented by the winter dataset, in contrast with its summer counterpart, contains more hygroscopic particles and particles with an enhanced ability to absorb sunlight due to the larger fraction of black carbon. Moreover, the winter observations are characterized by more frequent clouds and a larger fraction of super-micron particles. We calculate model total scattering coefficient at ambient conditions using size spectra measured by optical particle counters (OPCs) and ambient complex refractive index (RI) estimated from measured chemical composition and relative humidity (RH). We demonstrate that reasonable agreement (similar to 20% on average) between the observed and calculated scattering can be obtained under subsaturated ambient conditions (RH < 80%) by applying both screening for clouds and chemical composition data for the RI-based correction of the OPC-derived size spectra.
Subjectaircraft measurements of aerosol microphysical
chemical, and optical components and ambient relative humidity
ultra-high sensitivity aerosol spectrometer (UHSAS)
passive cavity aerosol spectrometer (PCASP)
cloud and aerosol spectrometer (CAS)
aerosol mass spectrometer (AMS)
single particle soot photometer (SP2)
single particle mass spectrometer (miniSPLAT)
winter phase of Two-Column Aerosol Project (TCAP)
Except where otherwise noted, this item's license is described as Creative Commons Attribution 4.0 International
Showing items related by title, author, creator and subject.
.Kassianov, Evgueni; Berg, Larry K.; Pekour, Mikhail; Barnard, James; Chand, Duli; Flynn, Connor; Ovchinnikov, Mikhail; Sedlacek, Arthur; Schmid, Beat; Shilling, John; Tomlinson, Jason; Fast, Jerome (7/31/2015)We present a framework for calculating the total scattering of both non-absorbing and absorbing aerosol at ambient conditions from aircraft data. Our framework is developed emphasizing the explicit use of chemical composition ...
.Collins, Amy Hutsinpiller (University of Nevada, Reno, 1988)The geology of the Virginia Range was studied using remote sensing techniques. The research shows the capabilities of various remote sensing systems to discriminate and map hydrothermal alteration mineral assemblages, and ...
.Gyawali, Madhu Sudhan (2012)Atmospheric aerosols considerably influence the climate, reduce visibility, and cause problems in human health. Aerosol light absorption and scattering are the important factors in the radiation transfer models. However, ...