Over the relevant range of variation in CO2, you make only a modest error (a little less than 10%) by assuming forcing is linearly proportional to CO2 rather than logarithmically.
Given that a large portion of the temperature change is driven by albedo changes and other indirect forcing, rather than directly by CO2, I think it is very difficult to empirically discriminate between linear and logarithmic response during the ice age transition. Of course, laboratory work shows a clearly logarithmic response, but the Earth is a noisy environment and the limited range of variation during the ice ages doesn't provide a strong basis for identifying the logarithmic characteristics. However, the range of variation between the ice ages and where we are going now should provide a much more practical "experiment" for seeing the logarithmic characteristics. -Robert A. Rohde http://www.globalwarmingart.com/ On Oct 4, 5:35 am, Tom Adams <[EMAIL PROTECTED]> wrote: > Both the temp and CO2 increase looks linear during the rapid rise when > the Earth is going from a glacial to inter-glacial: > > http://www.globalwarmingart.com/wiki/Image:Carbon_Dioxide_400kyr_Rev_png > > http://www.globalwarmingart.com/wiki/Image:Ice_Age_Temperature_Rev_png > > The log relationship between CO2 conc. and temp. is not reflected in > this period of rapid rise. Why not? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups Global Change ("globalchange") newsgroup. Global Change is a public, moderated venue for discussion of science, technology, economics and policy dimensions of global environmental change. Posts will be admitted to the list if and only if any moderator finds the submission to be constructive and/or interesting, on topic, and not gratuitously rude. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/globalchange -~----------~----~----~----~------~----~------~--~---
