Stratospheric Sulfuric Acid Layer: Evidence for an Anthropogenic Component

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Science  20 Jun 1980:
Vol. 208, Issue 4450, pp. 1368-1370
DOI: 10.1126/science.208.4450.1368


Recent measurements of small aerosol particles in the stratosphere over Laramie, Wyoming, indicate low-concentration background conditions. A comparison of measurements made some 20 years ago with the present background concentration reveals the possibility of an increase of 9 percent per year. Since the aerosol particles are predominantly sulfuric acid droplets which form in the stratosphere from tropospheric sulfur-containing gases, such an increase may be related to man-made sulfur emissions.