Tropospheric ozone and aerosol observations - The Alaskan Arctic

Journal Article · Thu Oct 01 04:00:00 EDT 1992 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/91JD01310· OSTI ID:6764830

Gregory, G L; Anderson, B E; Warren, L S; Browell, E V; Bagwell, D R; Hudgins, C H ^[1]

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1. NASA, Langley Research Center, Hampton, VA (United States)

This paper discusses in situ measurements of O[sub 3], aerosol number density, and aerosol size obtained during NASA Arctic Boundary Layer Expedition aircraft flights over the Alaskan Arctic region. The major source of summer O[sub 3] for the troposphere in the intrusion of stratospheric air and subsequent transport to lower altitudes. Photochemistry of mixed layer emissions and O[sub 3] transported from high northern latitude urban/industrialized areas do not appear to play major roles as sources of O[sub 3] for the Alaska region. O[sub 3] gradients reflect the loss at the surface and supply from the stratosphere. Free tropospheric O[sub 3] averaged 74 ppbv compared to 32 ppbv for the mixed layer. O[sub 3] loss mechanisms are a combination of the destruction via photochemistry, chemical reaction with surface emissions, and direct loss through deposition to the surface. The boreal forest in the most efficient of the O[sub 3] sinks and has the largest increase in aerosol number density relative to the free troposphere. 37 refs.

• OSTI ID: 6764830
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 97; ISSN JGREA2; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AEROSOLS
AIR POLLUTION MONITORING
ARCTIC REGIONS
ATMOSPHERIC CHEMISTRY
BOUNDARY LAYERS
CHEMISTRY
COLLOIDS
DISPERSIONS
EARTH ATMOSPHERE
LAYERS
MONITORING
OZONE
PHOTOCHEMISTRY
POLAR REGIONS
SOLS
TROPOSPHERE