Hansen 2003 : Soot Twice As Effective As CO2

Soot climate forcing via snow and ice albedos  James Hansen*  †‡  and Larissa Nazarenko*  †

Plausible estimates for the effect of soot on snow and ice albedos (1.5% in the Arctic and 3% in Northern Hemisphere land areas) yield a climate forcing of 0.3 Wm2 in the Northern Hemisphere. The ‘‘efficacy’’ of this forcing is 2, i.e., for a given forcing it is twice as effective as CO2 in altering global surface air temperature.

Global Warming. Soot snowice albedo climate forcing is not included in Intergovernmental Panel on Climate Change evaluations.  This forcing is unusually effective, causing twice as much global  warming as a CO2 forcing of the same magnitude. This high efficacy  is a straight-forward consequence of positive albedo feedbacks and  atmospheric stability at high latitudes.  Our estimate for the mean soot effect on spectrally integrated  albedos in the Arctic (1.5%) and Northern Hemisphere land areas  (3%) yields a Northern Hemisphere forcing of 0.3 Wm2  or an  effective hemispheric forcing of 0.6 Wm2  . The calculated global  warming in an 1880–2000 simulation is about one quarter of  observed global warming

pubs.giss.nasa.gov/docs/2004/2004_Hansen_Nazarenko.pdf

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6 Responses to Hansen 2003 : Soot Twice As Effective As CO2

  1. DC Andy says:

    What ever happened to evil Chinese aerosols, which are suppose to cause the next Ice Age?

  2. Marian says:

    Those evil Chinese aerosols now appear to be the good guys. Supposed to slowdown warming.

    They’ve been cited as one of the possible causes for the lack of warming or the flattening off of temps over the last decade. :-)

  3. Jimbo says:

    Did Hansen change his mind? If yes then does it have ANYTHING to do with selling books, awards, free flights to HOT climates to ge hot under the collar etc? :) You decide.

  4. Me says:

    What about wind blown silt and sediment? You know, the stuff from the bare ground where nothing grows because of the cold, that is weathered by the ice into fine particulate that ends up being deposited on the glaciers?

  5. Billy Liar says:

    Iceland glaciers are covered in fine black material but it ain’t soot. It’s black lava sand.

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