Publication


A. W. Rollins, et al.
The role of sulfur dioxide in stratospheric aerosol formation evaluated by using in situ measurements in the tropical lower stratosphere
Geophysical Research Letters, 44(9), 4280-4286, 2017; doi: 10.1002/2017GL072754
troposphere middle atmosphere UTLS stratosphere aerosols particles SO2
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Abstract


Stratospheric aerosols (SAs) are a variable component of the Earth's albedo that may be intentionally enhanced in the future to offset greenhouse gases (geoengineering). The role of tropospheric-sourced sulfur dioxide (SO2) in maintaining background SAs has been debated for decades without in situ measurements of SO2 at the tropical tropopause to inform this issue. Here we clarify the role of SO2 in maintaining SAs by using new in situ SO2 measurements to evaluate climate models and satellite retrievals. We then use the observed tropical tropopause SO2 mixing ratios to estimate the global flux of SO2 across the tropical tropopause. These analyses show that the tropopause background SO2 is about 5 times smaller than reported by the average satellite observations that have been used recently to test atmospheric models. This shifts the view of SO2 as a dominant source of SAs to a near-negligible one, possibly revealing a significant gap in the SA budget.

Reference


@article{Rollins2017a,
  author = "A. W. Rollins and T. D. Thornberry and L. A. Watts and P. Yu and K. H. Rosenlof and M. Mills and E. Baumann and F. R. Giorgetta and T. V. Bui and M. Höpfner and K. A. Walker and C. Boone and P. F. Bernath and P. R. Colarco and P. A. Newman and D. W. Fahey and R. S. Gao",
  title = "The role of sulfur dioxide in stratospheric aerosol formation evaluated by using in situ measurements in the tropical lower stratosphere",
  year = 2017,
  journal = "Geophysical Research Letters",
  publisher = "AGU Publications",
  volume = 44,
  number = 9,
  pages = "4280-4286",
  month = "May",
  keywords = "troposphere, middle atmosphere, UTLS, stratosphere, aerosols, particles, SO2",
  doi = "10.1002/2017GL072754",
  url = "http://dx.doi.org/10.1002/2017GL072754"
}
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