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Anthropogenic Aerosol Emissions and Rainfall Decline in South-West Australia

In: High Performance Computing in Science and Engineering ´16

Author

Listed:
  • Dominikus Heinzeller

    (Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK-IFU)
    Augsburg University, Department of Geography)

  • Wolfgang Junkermann

    (Karlsruhe Institute of Technology, IMK-IFU, KIT, Institute of Meteorology and Climate Research)

  • Harald Kunstmann

    (Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK-IFU)
    Augsburg University, Department of Geography)

Abstract

It is commonly understood that the observed decline in precipitation in South-West Australia during the twentieth century is caused by anthropogenic factors. In our project wa-aero on ForHLR1, we focus on the role of rapidly rising aerosol emissions from anthropogenic sources in South-West Australia around 1970. An analysis of historical longterm rainfall data of the Bureau of Meteorology shows that South-West Australia as a whole experienced a gradual decline in precipitation over the twentieth century. However, on smaller scales and for the particular example of the Perth catchment area, a sudden drop in precipitation around 1970 is apparent. Modelling experiments at a convection-resolving resolution of 3.3 km using the Weather and Research Forecasting (WRF) model version 3.6.1 with the aerosol-aware Thompson-Eidhammer microphysics scheme are conducted for the period 1970–1974. A comparison of four runs with different prescribed aerosol emissions and without aerosol effects demonstrates that tripling the pre-1960s atmospheric CCN and IN concentrations, as suggested by air-borne measurements, can suppress precipitation by 2–9 %, depending on the area and the season. An extended version of the results presented here was accepted for publication in the Journal of Climate in June 2016.

Suggested Citation

  • Dominikus Heinzeller & Wolfgang Junkermann & Harald Kunstmann, 2016. "Anthropogenic Aerosol Emissions and Rainfall Decline in South-West Australia," Springer Books, in: Wolfgang E. Nagel & Dietmar H. Kröner & Michael M. Resch (ed.), High Performance Computing in Science and Engineering ´16, pages 559-576, Springer.
    • Handle: RePEc:spr:sprchp:978-3-319-47066-5_38
    DOI: 10.1007/978-3-319-47066-5_38
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