Data assimilation and model calculations to study chemistry climate interactions and solar impact in the polar stratosphere - Phase 2 (DACCS)

• Antragstellerinnen / Antragsteller: Professor Dr. John Philip Burrows, seit 6/2011; Professorin Dr. Ulrike Langematz
• Fachliche Zuordnung: Physik und Chemie der Atmosphäre
• Förderung: Förderung von 2007 bis 2013
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 42471848

This project will investigate the interaction between ozone and atmospheric dynamics in the polar stratosphere with the help of data assimilation of satellite ozone observations and analyses of coupled chemistry climate model (CCM) integrations. There will be a focus on early winter ozone in the polar stratosphere and its relation to meteorological conditions later during winter and total ozone during spring. It has been shown that there exists an unexpectedly strong correlation between polar stratospheric ozone in autumn and early winter and total ozone at high latitudes during spring. Similarly, there exists a close correlation between early winter ozone and meteorological conditions later during winter and spring. The mechanisms for this relation are currently unclear. Moreover, there is some evidence for a possible large solar impact on polar stratospheric ozone in early winter. Here we will analyse in detail a global long-term data set of stratospheric ozone, that is currently being created within the first phase of the DACCS project through the assimilation of SBUV(/2) satellite observations into a chemical transport model. We will in particular analyse the mechanisms that lead to the inter-annual variability of polar ozone during autumn and the persistence of ozone anomalies over the winter. In order to investigate a possible role of anomalies in nitrogen species, we will extend the assimilation to include observations of nitrogen oxides (NOx) from the HALOE/UARS instrument. We will analyse existing chemistry climate model integrations and will perform a set of additional sensitivity runs with a general circulation model to test certain hypotheses of the influence of ozone anomalies on the flux of planetary waves.

• DFG-Verfahren: Schwerpunktprogramme
• Teilprojekt zu: SPP 1176: Klima und Wetter des Systems Sonne/Erde
• Ehemaliger Antragsteller: Privatdozent Dr. Björn-Martin Sinnhuber, bis 6/2011