Aerosol forcing, climate response and climate sensitivity in the Hadley Centre climate model

[1] An atmosphere/mixed-layer-ocean climate model is used to investigate the climate responses to forcing by 1860–2000 changes in anthropogenic sulfate, biomass-burning and black carbon aerosols, and how they compare with the effect of doubling CO2. While the patterns of temperature response from sulfate and black carbon aerosols are similar and reveal high sensitivity at high latitudes in the northern hemisphere, they are significantly different to that due to CO2 which shows high latitude sensitivity in both hemispheres, and to biomass-burning aerosols which shows a much more uniform temperature response. Climate sensitivity, the response of natural primary aerosols, and the degree to which forcings and responses are additive, are also investigated. The sum of the separate temperature and precipitation responses to each aerosol is found to be remarkably similar to that obtained if all aerosols are changed simultaneously.

[1]  Robert Joseph Andres,et al.  Historical Sulfur Dioxide Emissions 1850-2000: Methods and Results , 2004 .

[2]  S. Woodward,et al.  Modeling the atmospheric life cycle and radiative impact of mineral dust in the Hadley Centre climate model , 2001 .

[3]  Corinne Le Quéré,et al.  Climate Change 2013: The Physical Science Basis , 2013 .

[4]  S. Twomey.  Pollution and the Planetary Albedo , 1974 .

[5]  J. Hansen,et al.  Efficacy of climate forcings , 2005 .

[6]  Alessandra Giannini,et al.  Robust Sahel drying in response to late 20th century forcings , 2006 .

[7]  Leon D. Rotstayn,et al.  Tropical Rainfall Trends and the Indirect Aerosol Effect , 2002 .

[8]  Mark Z. Jacobson,et al.  Climate response of fossil fuel and biofuel soot, accounting for soot's feedback to snow and sea ice albedo and emissivity , 2004 .

[9]  D. Sexton,et al.  Design and Analysis of Climate Model Experiments for the Efficient Estimation of Anthropogenic Signals , 2003 .

[10]  A. Jones,et al.  The response of the climate system to the indirect effects of anthropogenic sulfate aerosol , 2001 .

[11]  G. Martin,et al.  The Physical Properties of the Atmosphere in the New Hadley Centre Global Environmental Model (HadGEM1). Part I: Model Description and Global Climatology , 2006 .

[12]  Michel Crucifix,et al.  The new hadley centre climate model (HadGEM1) : Evaluation of coupled simulations , 2006 .

[13]  J. Hansen,et al.  Radiative forcing and climate response , 1997 .

[14]  B. Albrecht.  Aerosols, Cloud Microphysics, and Fractional Cloudiness , 1989, Science.

[15]  Piers M. Forster,et al.  Climate Forcings and Climate Sensitivities Diagnosed from Coupled Climate Model Integrations , 2006 .

[16]  M. Jacobson.  Control of fossil‐fuel particulate black carbon and organic matter, possibly the most effective method of slowing global warming , 2002 .

[17]  Michael F. Wehner,et al.  Testing the linearity of the response to combined greenhouse gas and sulfate aerosol forcing , 2004 .

[18]  Leon D. Rotstayn,et al.  Indirect Aerosol Forcing, Quasi Forcing, and Climate Response , 2001 .

[19]  H. L. Miller,et al.  Climate Change 2007: The Physical Science Basis , 2007 .

[20]  Tami C. Bond,et al.  Emissions of primary aerosol and precursor gases in the years 2000 and 1750 prescribed data-sets for AeroCom , 2006 .

[21]  John F. B. Mitchell,et al.  Carbon Dioxide and Climate. The Impact of Cloud Parameterization , 1993 .

[22]  Andrei P. Sokolov,et al.  Does Model Sensitivity to Changes in CO2 Provide a Measure of Sensitivity to Other Forcings , 2006 .

[23]  A. Jones,et al.  Climate sensitivity to black carbon aerosol from fossil fuel combustion , 2004 .

[24]  V. Ramaswamy,et al.  Linear additivity of climate response for combined albedo and greenhouse perturbations , 1997 .

[25]  Joyce E. Penner,et al.  Soot and smoke aerosol may not warm climate , 2002 .

[26]  U. Lohmann,et al.  Global indirect aerosol effects: a review , 2004 .

[27]  Andrew S. Jones,et al.  Indirect sulphate aerosol forcing in a climate model with an interactive sulphur cycle , 2001 .

[28]  S. Manabe,et al.  Transient response of a coupled model to estimated changes in greenhouse gas and sulfate concentrations , 1997 .