The Relation of Stratospheric Aerosols with Trace Gases and Temperature

The HALOE (Halogen Occultation Experiment) dataset is used to study the relation of stratospheric aerosols with trace gases (O3, H2O, HCl, NOx, CH4, and HF) and temperature in a period of relative volcanic quiescence. The lag-correlation analysis shows trace gases and temperature are significantly related to aerosol surface area density. Characteristics of the relevance vary with different components. Temperature is negatively correlated with aerosol for 70－20 hPa over low-and mid-latitudes. Standardized multiple linear regression demonstrates that greenhouse gases are the primary direct contributor for temperature change, and the direct contribution of aerosols is much less. The impact of aerosols on the stratosphere is simulated with the two-dimensional model SOCRATES (Simulation of Chemistry, Radiation, and Transport of Environmentally important Species). The response of trace gases and temperature coincides with the analysis of the HALOE. The rangeability of temperature is much less than that of aerosols. The result suggests that the stratospheric heterogeneous processes on aerosol surfaces are important for the relation between aerosols and trace gases in the aerosol-enriched layers. The radiation effect of aerosols is cooling in the period of relative volcanic quiescence, which is different from the warming effect after volcanic eruptions. The phenomenon depends on the aerosol contents. The indirect radiation effect via heterogeneous processes is stronger than the direct effect of aerosols themselves, but the total radiation effect makes little impact on temperature.