+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Aikin, K. C.  Author > Baumgardner, D. G.  Author > Chung, S. H.  Author > Darbeheshti, M.  Author > Fahey, D. W.  Author > Gao, R. S.  Author > Hendricks, J.  Author > Kaercher, B.  Author > Kok, G. L.  Author > Langford, A. O.  Author > Lauer, A.  Author > Loewenstein, M.  Author > Reeves, J. M.  Author > Rosenlof, K. H.  Author > Schulz, M.  Author > Schwartz, J. P.  Author > Slowik, J. G.  Author > Thompson, T. L.  Author > Thomson, D. S.  Author > Watts, L. A.  Author > Wilson, J. C.  NASA Center > Ames Research Center  Publication Year > 2001-2010 > 2006  Subject > M-O > Meteorology And Climatology  Availability Options > Online > PDF  Item/Media Type > Journal Article  Note: Start a new navigation search by selecting a link above     Previous Record | Next Record + Back to Results   + Printer Friendly Title: Single-Particle Measurements of Midlatitude Black Carbon and Light-Scattering Aerosols from the Boundary Layer to the Lower Stratosphere Author(s): Schwartz, J. P.; Gao, R. S.; Fahey, D. W.; Thomson, D. S.; Watts, L. A.; Wilson, J. C.; Reeves, J. M.; Darbeheshti, M.; Baumgardner, D. G.; Kok, G. L.; Chung, S. H.; Schulz, M.; Hendricks, J.; Lauer, A.; Kaercher, B.; Slowik, J. G.; Rosenlof, K. H.; Thompson, T. L.; Langford, A. O.; Loewenstein, M.; Aikin, K. C. Abstract: A single-particle soot photometer (SP2) was flown on a NASA WB-57F high-altitude research aircraft in November 2004 from Houston, Texas. The SP2 uses laser-induced incandescence to detect individual black carbon (BC) particles in an air sample in the mass range of approx.3-300 fg (approx.0.15-0.7 microns volume equivalent diameter). Scattered light is used to size the remaining non-BC aerosols in the range of approx.0.17-0.7 microns diameter. We present profiles of both aerosol types from the boundary layer to the lower stratosphere from two midlatitude flights. Results for total aerosol amounts in the size range detected by the SP2 are in good agreement with typical particle spectrometer measurements in the same region. All ambient incandescing particles were identified as BC because their incandescence properties matched those of laboratory-generated BC aerosol. Approximately 40% of these BC particles showed evidence of internal mixing (e.g., coating). Throughout profiles between 5 and 18.7 km, BC particles were less than a few percent of total aerosol number, and black carbon aerosol (BCA) mass mixing ratio showed a constant gradient with altitude above 5 km. SP2 data was compared to results from the ECHAM4/MADE and LmDzT-INCA global aerosol models. The comparison will help resolve the important systematic differences in model aerosol processes that determine BCA loadings. Further intercomparisons of models and measurements as presented here will improve the accuracy of the radiative forcing contribution from BCA. NASA Center: Ames Research Center Publication Date: 29 Aug. 2006 Document Source: Other Sources Online Source: Link to Data Provider's Site for Detailed Information Available Data: Abstract Only Document ID: 20090001329 Publication Information: Journal of Geophysical Research Atmospheres, Volume 111, ISSN 0148-0227, Number of Pages = 1 Contract-Grant-Task Number: NNA05CS27A Keywords: MIXING RATIOS; CARBON; LIGHT SCATTERING; BOUNDARY LAYERS; AEROSOLS; ATMOSPHERIC MODELS; TEMPERATE REGIONS; INCANDESCENCE; STRATOSPHERE; Accessibility: Unclassified; Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2009-01-15 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007