Air Pollution Has Put a Brake on Global Warming?

I was reading this article.

“the earth would be 0.5 to 1.1 degree C (0.9 to 2 degrees F) warmer if that pollution were to suddenly disappear.”

Like this USA data?

Image result for so2 USA

Or Europe?

SO2 emissions

Clean Air Acts have cut the SO2 pollution by a huge amount.

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4 thoughts on “Air Pollution Has Put a Brake on Global Warming?

  1. Sunshine, even IPCC contradicts the aerosol excuse:

    “Aerosols undergo physical and chemical transformations in the atmosphere, especially within clouds, and are removed largely by precipitation. Consequently aerosols in the lower troposphere typically have residence times of a few days.”- IPCC, SAR, WG1, p.20
    In the 1940s-1970s they were too insignificant to have global impact. The only aerosols that can cause a global impact are volcanic aerosols that reach the stratosphere and are there for a year or two, and they only cause a small cooling, not the several tenths of a degree C that happened in the 1940-1970s, while the amount of human CO2 added to he atmosphere TRIPLED.

    1. The weekend effect is real.

      “The direct and indirect effects of human‐related aerosols on radiation, cloud, precipitation, and so on, might play an important role in generating the opposite signal in the weekend effect for different seasons. During a dry winter, the reduction of aerosol concentrations may overwhelmingly impact on the DTR through a direct effect, i.e., by increasing total solar irradiance near the surface and raising the daytime temperature and maximum temperature and lowering relative humidity. By contrast, in summer the indirect effect of aerosols, i.e., reduction in precipitation efficiency caused by more numerous and smaller cloud droplets, would largely be responsible for the increased numbers of rainy days, the reduction of the total solar irradiance, and the lowering of the maximum temperature and DTR”

      https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2006JD007068

      “Using surface measurements of maximum and minimum temperatures from the Global Daily Climatological Network data set, we find evidence of a weekly cycle in diurnal temperature range (DTR) for many stations in the United States, Mexico, Japan, and China. The “weekend effect,” which we define as the average DTR for Saturday through Monday minus the average DTR for Wednesday through Friday, can be as large as 0.5 K, similar to the magnitude of observed long-term trends in DTR.”

      https://www.pnas.org/content/100/20/11225

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