Anthropogenic sources of halocarbons, sulfur hexafluoride, carbon monoxide, and methane in the southeastern United States

P. S. Bakwin; D. F. Hurst; P. P. Tans; J. W. Elkins

doi:10.1029/97jd00869

journal article Jul 01, 1997

Anthropogenic sources of halocarbons, sulfur hexafluoride, carbon monoxide, and methane in the southeastern United States

P. S. Bakwin D. F. Hurst P. P. Tans J. W. Elkins

Journal of Geophysical Research: Oceans Vol. 102 No. D13 pp. 15915-15925 · American Geophysical Union (AGU)

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Abstract

Mixing ratios of several radiatively active and ozone depleting trace gases were measured at 1‐hour intervals from December 1994 to August 1996 at 496 m above the ground on a communications tower in eastern North Carolina. The time series show variability on a range of timescales, most apparently diurnal cycles, pollution episodes with synoptic time scale, seasonal cycles, and long‐term trends. We focus on the pollution episodes and analyze the time series to reveal relationships between species in polluted air. These relationships are used to determine relative sources of the constituents on a regional scale. Using tetrachloroethene (C2Cl4) as a reference compound and assuming that the tower site is representative of the whole continent with respect to emissions ratios, we estimate source strengths of the other species for North America. For methyl chloroform (CH3CCl3) our emissions estimate is in excellent accord with an estimate from industrial production figures, giving confidence in our methods and assumptions. For carbon monoxide (CO) our estimate also agrees very well with an independent estimate of North American sources based on national inventories. Sources of chlorofluorocarbons 11, 12, and 113 are much lower than expected from global emissions inventories, a finding that may indicate that the ratio of North American to global emissions of these compounds has dropped dramatically since the mid‐1980s, as was indeed the case for CH3CCl3, or that emissions of these compounds have decreased more rapidly in recent years than industry estimates, or most likely both. We also estimate the North American source of sulfur hexafluoride (SF6).

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Details

Published: Jul 01, 1997
Vol/Issue: 102(D13)
Pages: 15915-15925
License: View

Authors

Cooperative Institute for Research in Environmental Sciences; University of Colorado Boulder; Boulder Colorado USA; Global Monitoring Division; NOAA Earth System Research Laboratory; Boulder Colorado USA

P

P. P. Tans

Climate Monitoring and Diagnostics Laboratory NOAA Boulder Colorado USA

J

J. W. Elkins

NOAA Climate Monitoring and Diagnostics Laboratory Boulder Colorado USA

Cite This Article

P. S. Bakwin, D. F. Hurst, P. P. Tans, et al. (1997). Anthropogenic sources of halocarbons, sulfur hexafluoride, carbon monoxide, and methane in the southeastern United States. Journal of Geophysical Research: Oceans, 102(D13), 15915-15925. https://doi.org/10.1029/97jd00869

Anthropogenic sources of halocarbons, sulfur hexafluoride, carbon monoxide, and methane in the southeastern United States

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