Sentences with phrase «then orbital forcings»
Then orbital forcings are added.
http://www.realclimate.org/ Not exact matches
He then uses what information is available to quantify (in Watts per square meter) what radiative terms drive that temperature change (for the LGM this is primarily increased surface albedo from more ice / snow cover, and also changes in greenhouse gases... the former is treated as a forcing, not a feedback; also, the orbital variations which technically drive the process are rather small in the global mean).
This may then lead to additional changes, for example, the incorporation of ozone feedbacks to solar changes, or the calculation of vegetation feedbacks to orbital forcing — which in each case improved the match to the observations.
The radiative forcing due to CO2 may serve as an amplifier of initial orbital forcing, which is then further amplified by fast atmospheric feedbacks (39) that are also at work for the present - day and future climate.
If Northern Hemisphere temperatures have been in an overall cooling trend for two millennia due to «orbital forcing» (i.e. reduced solar irradiance), then the burden of proof becomes greater on those who attribute the warmth of recent decades to solar variability rather than rising greenhouse gas concentrations.
The largest forcing by far in the SH is the solar annular mode from orbital differences, being greater then 120 wm ^ 2 and tends to reoccur each year.
What I actually said — and have always said — is that if the net of * all * feedbacks in the climate system is negative, then a mere seasonal and spatial reorganisation of TSI under orbital forcing would not be capable of terminating glacials.
But the feedback mechanisms are still there, and if they amplified orbital forcings enough to produce interglacials, then it's hard to avoid saying they will amplify the effects of CO2 now.
According to Petit et al. [2] the same sequence of events in each glacial termination involved «orbital forcing (with a possible contribution of local insolation changes) followed by two strong amplifiers, greenhouse gases acting first, then deglaciation and ice - albedo feedback».
The radiative forcing due to CO2 may serve as an amplifier of initial orbital forcing, which is then further amplified by fast atmospheric feedbacks (39) that are also at work for the presentday and future climate.
About orbital forcing: fine, small differences in insolation were amplified by ice albedo feedbacks and GHG feedbacks (on the way down I guess), but then what?