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Factors influencing atmospheric composition over subarctic North America during summerElevated concentrations of hydrocarbons, CO, and nitrogen oxides were observed in extensive haze layers over northeastern Canada in the summer of 1990, during ABLE 3B. Halocarbon concentrations remained near background in most layers, indicating a source from biomass wildfires. Elevated concentrations of C2Cl4 provided a sensitive indicator for pollution from urban/industrial sources. Detailed analysis of regional budgets for CO and hydrocarbons indicates that biomass fires accounted for approximately equal to 70% of the input to the subarctic for most hydrocarbons and for acetone and more than 50% for CO. Regional sources for many species (including CO) exceeded chemical sinks during summer, and the boreal region provided a net source to midlatitudes. Interannual variations and long-term trends in atmospheric composition are sensitive to climatic change; a shift to warmer, drier conditions could increase the areas burned and thus the sources of many trace gases.
Document ID
19950031288
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wofsy, Steven C.
(Harvard Univ. Cambridge, MA, United States)
Fan, S. -M.
(Harvard Univ. Cambridge, MA, United States)
Blake, D. R.
(Univ. of California at Irvine, Irvine, CA United States)
Bradshaw, J. D.
(Georgia Institute of Technology, Atlanta, GA United States)
Sandholm, S. T.
(Georgia Institute of Technology, Atlanta, GA United States)
Singh, H. B.
(NASA Ames Research Center Moffett Field, CA, United States)
Sachse, G. W.
(NASA Langley Research Center Hampton, VA, United States)
Harriss, R. C.
(Univ. of New Hampshire, Durham, NH United States)
Date Acquired
August 16, 2013
Publication Date
January 20, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: D1
ISSN: 0148-0227
Subject Category
Meteorology And Climatology
Accession Number
95A62887
Funding Number(s)
CONTRACT_GRANT: NAG1-55
CONTRACT_GRANT: NSF ATM-89-21119
Distribution Limits
Public
Copyright
Other

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