Hi all, Our paper looking at precipitation pattern changes in CO2 ramp-up/ramp-down experiments, where CO2 concentrations are smoothly increased then decreased along the same path in a GCM, is out now online first in Climate Dynamics;
http://www.springerlink.com/content/v3181058p404147j/ This follows up on the lag between global mean precipitation and temperature change observed in similar GCM ramp-up/ramp-down experiments by Wu et al 2010 GRL and Cao et al 2011 GRL. The main result is that as well as a lag in the global mean precipitation, there is also an asymmetry in the pattern of tropical rainfall changes between CO2 ramp-up and ramp-down. Whereas the global mean precipitation lag can be explained by different levels of CO2 for the same global mean temperature between ramp-up and ramp-down, the pattern changes cannot. Instead they are likely to be due to lags in ocean heat transfer affecting sea surface temperatures and precipitation patterns. The implication is that a CO2 pathway of increasing then decreasing CO2 concentrations may lead us to climate states during CO2 decrease that have not been experienced during the increase. Any comments/feedback much appreciated, Regards, Rob -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To view this discussion on the web visit https://groups.google.com/d/msg/geoengineering/-/CA4uOLdgF-wJ. To post to this group, send email to geoengineering@googlegroups.com. To unsubscribe from this group, send email to geoengineering+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
