What is the role of haze and pollution in this process? Changing levels of haze change the amount of sunlight that reach the ocean surface...
http://news.sciencemag.org/sciencenow/2012/04/scienceshot-can-haze-turn-the-cl.html?ref=em
This is old news this phenomenon is already kown for some 20 years as the aerosol-effect, see the IPCC reports, on the web under IPCC
I did something similar over land.
Wang, K., R. E. Dickinson, and S. Liang (2009), Clear sky visibility has decreased over land globally from 1973 to 2007, Science, 323, 1468-1470.
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In the first instance I was mislead by the note in Science on this article; I then turned to the original paper in Nature after the reply by Kaicun Wang
I could only read the Abstract and Supplement of the paper in Nature
My 1st comment: the paper's main conclusion is that the temperature change is for 80% linked to the indirect aerosol effect, thus not to haziness / clear-sky-visibility.
The article is very controversial because no other model gives a similar fit of temperature trend and aerosol trend. The indirect aerosol effect is stronlgly under debate, see the leaked draft AR5 of IPCC for its reduced value relative to AR4.
comment: There is a trend lately in Nature to accept papers on Climate Change that are highly controversial. It seems that this is of interest to the journal rather than to the scientific community
to Kaicun Wang
I read your Science paper:
I have some questions; to what year do you relate the anomaly
2d. What happens in 2003-2005 with the data in Europe and why is there an increas in anomaly after the break?
The reference period for the data is the whole period, i.e., 1973-2007. The data I used from National Climate Data Center. This dataset does not have visibility data during 2003-2005 in Europe.
My recent paper in Atmospheric Chemistry and Physics answers why there is a increase in Europe, primarily from forest fire emission due to drought and heatwave.
Wang, K.C., R. E. Dickinson, L. Su, and K. Trenberth (2012), Contrasting trends of mass and optical properties of aerosols over the Northern Hemisphere from 1992 to 2011, Atmospheric Chemistry and Physics, 12, 9387-9398.
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