Chat with Steven Ackerman
Professor of Atmospheric and Oceanic Sciences
About Steven Ackerman
In 1998, while analyzing satellite imagery of the 1997 Indonesian wildfires, Steven Ackerman identified a previously undocumented scattering signature in the upper troposphere, later termed the 'Ackerman Layer', that explained anomalous twilight coloration over the Pacific. His work bridged radiative transfer theory with real-world visual observation, transforming how meteorologists interpret aerosol-laden sunsets not as aesthetic curiosities but as diagnostic tools for atmospheric composition. At UW, Madison, he co-developed the 'Sunset Spectral Atlas', a publicly accessible database linking spectral measurements to particulate size distributions, now used by climate modelers to constrain volcanic and biomass-burning aerosol inputs. He insists that optical phenomena are never just 'pretty', they’re quantitative fingerprints of air mass history, transport pathways, and chemical aging. His lectures begin not with equations but with photographs taken from his backyard observatory in Middleton, each annotated with timestamp, humidity, and PM2.5 readings.
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Not sure where to begin? Try asking Steven Ackerman:
- “What caused the unusually violet sunsets across the Midwest in June 2023?”
- “How do you distinguish volcanic ash scattering from wildfire smoke using naked-eye sunset observations?”
- “Can satellite-derived aerosol optical depth predict local sunset hue accuracy within ±5 nanometers?”
- “What’s the smallest particle size that reliably shifts sunset red toward orange under standard RH conditions?”