Hi Stephen - I can say a ton about frequency response and phase shift. The foundation for all of that work was done in this paper for solar reduction: https://www.earth-syst-dynam.net/7/469/2016/esd-7-469-2016.html It turned out that we could use a similar control algorithm with a factor of ten scaling (for reasons that I can go into).
Sulfate aerosols are more difficult than solar reduction because you don't get the same control (you can't wall off the stratosphere), and there are nonlinearities in the response. Those two topics are covered by the papers with Simone Tilmes and Doug MacMartin as first authors, respectively. The paper with me as first author was putting all of that together and evaluating the performance of the control algorithm. More directly to your question, we went for a bandwidth corresponding to a ~5 year timescale, and we have a one year time delay because we're adjusting every year based on annual averages. I don't specifically remember what the phase shift was, but our phase margins were good enough that we weren't all that worried about convergence or peaking. If you're curious, I can try digging up some Bode plots. Best, Ben -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
