Quasi-biennial oscillation of the tropical stratospheric aerosol layer
Author:
Hommel R., Timmreck C.ORCID, Giorgetta M. A.ORCID, Graf H. F.
Abstract
Abstract. This study describes how aerosol in an aerosol-coupled climate model of the middle atmosphere is influenced by the quasi-biennial oscillation (QBO) during times when the stratosphere is largely unperturbed from volcanic material. In accordance with satellite observations, the tropical stratospheric aerosol load is predominately influenced by QBO induced anomalies in the vertical advection. Large impacts are seen in the size of aerosols, in particular in the region where aerosol evaporates. This turns the quasi-static balance between processes maintaining the vertical extent of the Junge layer in the tropics into a cyclic balance when considering this dominant mode of atmospheric variability. Global aerosol-interactive models without a QBO are only able to simulate the quasi-static balance state. To assess the global impact of stratospheric aerosols on climate processes, those partly non-linear relationships between the QBO and stratospheric aerosols have to be taken into account.
Publisher
Copernicus GmbH
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