Aerosol Model

The global aerosol model

Atmospheric aerosol particles, which are very small and suspended in the air, affect the Earth's climate by directly scattering and absorbing the atmospheric radiation and indirectly by acting as cloud condensation nuclei and modifying the optical properties of clouds. The origins of the aerosol particles are very complicated, and include not only natural sources but also anthropogenic causes. The aerosol particles include various chemical species, such as sulfate, black carbon, organic carbon, mineral dust and sea salt. Because the aerosols from anthropogenic sources have been increasing since the Industrial Revolution, and the aerosols from natural sources are influenced by the climate change, it is important for the global warming projection to take into account the climatic effects of aerosols.
The global aerosol model simulates the distribution of aerosols. It includes emissions, atmospheric transport, chemical reactions, gravitational settling, removal processes by dry deposition and precipitations, based on the meteorological fields and surface conditions simulated by the atmospheric general circulation model (MRI-CGCM3) and chemical species by the chemistry climate model (MRI CCM). The simulated aerosol distributions are used to calculate the effect of aerosols on atmospheric radiation and clouds in the atmospheric general circulation model.


JMA > MRI > Comprehensive Projection of Climate Change around Japan due to the Global Warming > Development of Earth System Model for Global Warming Projection > Aerosol Model

Mar.2008
by Team GW of MRI
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