I will agree with others that it is a bit less exciting right now in the climate science community but maybe thats a good thing.
I heard of the ozone paper elsewhere (but like others have not read it) and I thought of a guy in Australia named Earl Happ who has a blog that looks at how the sun affects climate due to changes in strataspheric ozone, particularly at the poles and high latitudes. He seems to be an amatuer in this game but I think there is insight that can be built upon that is consistent with the ozone paper. He’s looking at the problem of how changes in the sun might affect the atmospheric pressure at the poles. Most people are aware that the top of the atmosphere or thermosphere reached a minumum altitude in late 2008, early 2009 that was associated with the deep solar minimum. When the sun’s activity picks up more solar wind interacts with the upper atmosphere particularly over the poles, it provides a means to increase the atmospheric pressure at the poles, leading to the cold polar air spilling into the temperate latitudes and a high amplitude jet stream with blocking highs. I don’t know if Earl has it right but it seems this solar affect on the upper atmosphere should be studied. It also does not make sense to me that galactic cosmic rays are the culprit here. Weak solar activity is certainly associated with their increase but it makes much more sense that both the changes in upper atsmospheric ozone and changes in GCR’s are both a consequence of changes in the solar activity. They may provide two independent mechanism for how minor changes in the sun can have profound consequences on our weather.