Institute for Atmospheric and Climate Science

Global atmospheric Modelling

To understand climate change and future climate it is essential to understand how the past climate is functioning. In order to distinguish between natural variability and anthropogenic influences we must investigate the natural variability in the past. Recent studies suggest that tropospheric climate variability strongly affects stratospheric dynamics and composition even on long time-scales (Randel et al., 2002). Conversely, stratospheric interannual-to-decadal variability, e.g., caused by volcanic aerosols (Robock 2000; Adams et al., 2003) or the effect of solar variability on stratospheric temperature and ozone (Egorova et al., 2004, Rozanov et al., 2004), affects climate variability at the ground (Shindell et al., 2001). Anomalies in the zonal wind can slowly propagate downward. Baldwin et al. (2001) have shown that strong perturbations in the middle stratosphere may affect weather at the ground a few weeks later. The stratosphere plays a dominant role in the case of solar forcing or volcanic eruptions. The altering of the ozone content in the stratosphere leads to a altered absorption of radiation. The change of radiation properties by ozone change and volcanic aerosols alters the stratospheric meridional temperature gradients and, consequently, the strength of the zonal circulation, which through downward propagation may affect temperature at the Earth’s surface. To simulate the process described above, a chemistry-climate model (CCM) is a promising tool.

» Chemistry climate model SOCOL

» Influence of tropospheric methane concentrations on stratospheric composition and circulation

» Influence of energetic particle precipitation on stratospheric ozone and climate

» Geoengineering: Enhancing earth albedo by stratospheric sulfur injections






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