Secondary Climate Trends

Trends since 1925 in Earth's atmosphere of sulfur dioxide, nitrogen oxide, methane, black carbon, chlorine, temperature, and surface solar radiation.

Surface solar radiation (SSR) observed at Stockholm (blue dashed line, y-axis inverted) does not show much similarity to SSR calculated theoretically (dotted purple line, y-axis inverted) from concentrations of pollutants such as SO2, NOx, and black carbon. NOx data from RETRO (Schultz and Rast, 2008) interpolated before 1960 from US data (U. S. Environmental Protection Agency, 2000) are thought to be constant or slightly decreasing since 2000 (Cofala et al., 2009).

Last updated 05-Dec-2015    © 2015 Peter L. Ward. All Rights Reserved