Acid rain, a blast from the past like hearing an MC Hammer song

I just read, and quite enjoyed, a Slate article by Nina Shen Rastogi looking back at the acid rain problems of the 1980s [LINK]. She brings up a good point about the public awareness campaigns; I remember well many cartoons and kids shows mentioning and vilifying acid rain. I'm not sure that is happening now with global warming, but maybe it should be if it isn't. Anyway, the review also brings up two other good points. First, enacting acid rain mitigation strategies through federal legislation (e.g., the Clean Air Act of 1990) has dramatically reduced emissions of nitrogen oxides and sulfur dioxide from power plants and factories, leading to an improvement in the pH (i.e., acidity) of rain across the northeast USA and eastern Canada. The point being that these strategies are proven to be successful. Second, acid rain hasn't actually gone away, and it's still a hazard in some areas in the USA and Canada. Worse yet, industrializing nations such as China and India haven't gone through the cycle of discovering they are poisoning themselves, figuring out a way to fix it, and enacting the strategy. These countries could face serious environmental and infrastructure harm if they don't preempt emissions of acid rain precursors.

All of this sounds so much like issues involved with carbon dioxide and climate change that it's eerie, huh? I guess the disappointing thing is that there's still so much hesitation and resistance to doing something about these environmental issues in our culture. We've got clear examples of success, like the ozone hole and acid rain, where science described the mechanisms and suggested the causes, and mitigation strategies were adopted, and environmental catastrophe was avoided (or at least averted). It makes me wonder if past success has lulled us all into a false sense of confidence.... you can finish this disturbing thought.

Did the rain in Spain fall mostly on the plain, grandma?

A study about precipitation patterns in the Mediterranean region finds that there is a ubiquitous decrease [LINK]. The news article doesn't totally make sense, though, giving a mish-mash of half facts and ill-considered sentences. Maybe it's a poor translation? The figure caption is still in Spanish. The article gives the lead author and the journal, so I go to the GRL website to find the paper, and no, it isn't there. I search the web, finding the same news article over and over, "published" all over the internet, but no additional information.

I did find a very similar paper in the International Journal of Climatology, which would makes sense for this kind of study [LINK]. It's by the same author and was published in May. The difference is that this paper examines a set of precipitation indices, which I assume are based on rain gauges around the Iberian Peninsula, while the purported GRL article uses observations and the IPCC/PCMDI database of climate models. I'm not going to go into any detail on either paper, because I can't find the one that I want to see and because the one I did find doesn't seem to add any new information to the picture of decreasing precipitation in Iberia.

The topic can wait until I can get my hands on a proper analysis, but the bottom line is that there are observed changes in the precipitation across the Iberian Peninsula, especially southern Spain. This is also one of the regions that basically all the models agree will be severely impacted in the future, bringing persistent drought as global warming progresses. It's actually a pretty startlingly robust result, and is being borne out by observations. The pattern does extend across the Mediterranean, including southern France and northern Africa. The expectation is that warming will be greater in the region, and precipitation will decrease, and given the population and history of the region, I think it will prove an interesting result of climate change.