Abstract
Atmospheric black carbon (BC) mass concentrations in the southeastern United States have been measured at a regionally representative site near Mount Mitchell, North Carolina (35°44′05″N, 82°17′15″W, 2038 m elevation), the highest peak in the eastern United States, during a 9 month period from June to October 1996 and March to June 1997. BC concentrations are measured by an aethalometer, which operates by measuring the attenuation of light through a sample. All measured BC concentrations are reported in terms of air mass histories determined from back trajectory analysis using the Hybrid Single‐Particle Lagrangian Integrated Trajectory (HY‐SPLIT) model. Air masses influencing the site have been classified as polluted, marine, and continental according to SOx and NOx. emission inventories. The average BC mass concentrations for each sector are 216.6±47.8 ng m−3 for polluted air masses, 65.6±23.5 ng m−3 for marine air masses, and 169.9±50.6 ng m−3 for continental air masses. A positive relationship between cloud condensation nuclei and BC concentrations suggest at times the BC measured at the site may be internally mixed. The average BC concentration found in cloud water is 74.2 μg kg−1. Derived BC to sulfate mass ratios ranged from 0.01 to 0.06.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
