Re: [geo] Re: paper showing that "turning down the sun" experiments have similar climate results to "prescribed stratospheric aerosol" experiments

2014-07-28 Thread Andrew Lockley
Which groups are able to run a chemistry column model? If it's not been done, it's a glaring omission in the science. On a similar modelling note, does anyone know a group which does modelling of monoterpenes? I had an idea to genetically modify trees, which I'd like to test. A On 28 Jul 2014 06:

Re: [geo] Re: paper showing that "turning down the sun" experiments have similar climate results to "prescribed stratospheric aerosol" experiments

2014-07-27 Thread Govindasamy Bala
Hi Nathan, The changes to amount of water vapor in the lower stratosphere, like in the troposphere, is likely controlled by the stratospheric temperature change. i.e. follows C-C relationship. Therefore, the source mechanism for H2O in the low stratosphere may not be that important. I do agree tha

Re: [geo] Re: paper showing that "turning down the sun" experiments have similar climate results to "prescribed stratospheric aerosol" experiments

2014-07-27 Thread Nathan Currier
Hi, Ken – Thanks much for your response. Of course I see how you meant this, and I don’t really disagree as long as it’s clearly stated that, given the successful achievement of the same radiative forcing impacts with the two approaches, then there’s not much difference between the SRM and t

Re: [geo] Re: paper showing that "turning down the sun" experiments have similar climate results to "prescribed stratospheric aerosol" experiments

2014-07-26 Thread Dr. Adrian Tuck
The attachment gives abstracts of three papers that show the complexity of the mechanisms that result in stratospheric water vapor content, and also the several chemical complexities of stratospheric aerosol chemistry. Models are some way off being able to represent them quantitatively. On 26 Jul

Re: [geo] Re: paper showing that "turning down the sun" experiments have similar climate results to "prescribed stratospheric aerosol" experiments

2014-07-26 Thread Ken Caldeira
Nathan, Your questions are interesting but your initial statement is not true when it comes to first order effects on surface temperature and hydrology. [".. the similarity ("turning down the sun" and the SRM) depends on the ability of the models to reproduce, among other things, the stratospheric

[geo] Re: paper showing that "turning down the sun" experiments have similar climate results to "prescribed stratospheric aerosol" experiments

2014-07-26 Thread Nathan Currier
This is more question than comment, but it seem to go without saying that the similarity ("turning down the sun" and the SRM) depends on the ability of the models to reproduce, among other things, the stratospheric chemistry correctly. Solomon et al, 2010* (see below) concerned the hugely unde