Effect of carbonaceous aerosols on surface temperature in the mid twentieth century

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Read Full Article (file size: 838972 bytes) Cited by GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L04702, doi:10.1029/2005GL024887, 2006 Effect of carbonaceous aerosols on surface temperature in the mid twentieth century Tatsuya Nagashima Atmospheric Environment Division, National Institute for Environmental Studies, Ibaraki, Japan Hideo Shiogama Atmospheric Environment Division, National Institute for Environmental Studies, Ibaraki, Japan Tokuta Yokohata Atmospheric Environment Division, National Institute for Environmental Studies, Ibaraki, Japan Toshihiko Takemura Research Institute for Applied Mechanics, Kyushu University, Fukuoka, Japan Simon A. Crooks Department of Physics, University of Oxford, Oxford, UK Toru Nozawa Atmospheric Environment Division, National Institute for Environmental Studies, Ibaraki, Japan Abstract Simulations using a climate model are used to investigate the possible impact of increasing emissions of carbonaceous aerosols on near-surface temperature in the mid-20th century. The annual global mean near-surface temperature change from the mid-20th century onward is reasonably described by a model that is forced by changes in most of the known climate forcing agents including an increase in carbonaceous aerosols, though it can also be well reproduced without increases in carbonaceous aerosols. However, if we consider spatio-temporal structure of the changes in the near-surface temperature, an increase in carbonaceous aerosols is definitely required for the model to represent changes in the near-surface temperature in the mid-century, in particular, cooling trends in the tropical and subtropical continents. The significance of an increase in carbonaceous aerosols as an indispensable contributor to mid-20th century temperature changes is confirmed with the use of an optimal fingerprinting methodology. Received 7 October 2005; accepted 12 January 2006; published 17 February 2006. Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801, 4906); 1626 Global Change: Global climate models (3337, 4928); 3305 Atmospheric Processes: Climate change and variability (1616, 1635, 3309, 4215, 4513). Read Full Article (file size: 838972 bytes) Cited by Citation: Nagashima, T., H. Shiogama, T. Yokohata, T. Takemura, S. A. Crooks, and T. Nozawa (2006), Effect of carbonaceous aerosols on surface temperature in the mid twentieth century, Geophys. Res. Lett., 33, L04702, doi:10.1029/2005GL024887. Copyright 2006 by the American Geophysical Union.

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