Intrusions of stratospheric air into Alaska's troposphere,March 1983 |
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| Institution: | 1. USDA Forest Service, Rocky Mountain Research Station, 240 W. Prospect Rd., Fort Collins, CO, 80526, United States;1. Department of Biology, Aarhus University, Ole Worms Allé 1, building 1135, 8000 Aarhus C, Denmark;2. Aarhus University Centre for Water Technology WATEC Aarhus University, Ny Munkegade 120, buildmarding 1521, DK-8000 Aarhus C, Denmark;3. Department of Biological and Chemical Engineering - Process and Materials Engineering, Hangøvej 2, building 5250, 8200 Aarhus N, Denmark;1. USDA Forest Service, Rocky Mountain Research Station, 240 W. Prospect Rd., Fort Collins, CO, 80526 |
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| Abstract: | During the Arctic Gas and Aerosol Sampling Program (AGASP) in March 1983, two distinctly different mechanisms for transporting stratospheric air into the Arctic troposphere were documented. A tropopause folding event, associated with an Arctic front, injected ‘perturbed’ polar stratospheric air into the troposphere. This perturbed polar stratospheric air was characterized by enhanced condensation nuclei concentrations (up to 1800 cm−3), enhanced aerosol light scattering (up to 90 × 10−6m−1), and crustal aerosol particles of probable volcanic origin.The second mechanism, large-scale anticyclonic subsidence, transported relatively ‘clean’ stratospheric air into the Arctic troposphere. This clean stratospheric air was characterized by relatively low condensation nuclei concentrations (maximum of 300 cm−3), low aerosol light scattering (5–7] × 10−6 m−1), and the absence of detectable crustal particles. |
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