Dear Stephan,
Congratulations on your recent prestigious and well deserved award. I
agree with you that the term SRM needs to be differentiated with Cloud
Brightening.
But I hope you recall that cloud brightening can be achieved in multiple
ways not just by increased sea salt aerosol. Our model simulations show
that enhanced DMS production via limited iron fertilization (0.2
femtomolar (1.0E-12 molar) iron to 1 femtomolar over 1 percent of the
South Pacific) could achieve greatly enhanced dimethyl sulfide
production and sulfate aerosol, the main precursor to CCN and cloud
brightening in the clean marine atmosphere. Especially, north of the
Southern Westerlies were it is greatly needed to keep or restore the
southward shift and intensification of these winds.
Oliver
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