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Relations between lower stratospheric O3 and ENSO
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 10th Congress of the Balkan Geophysical Society, Sep 2019, Volume 2019, p.1 - 5
Abstract
It is well accepted that temperature difference between western and eastern equatorial Pacific is the main driver of ENSO climate mode. The temporal variability of the spatial distribution of this difference, on the other hand, corresponds to the different ENSO phases – El Nino and La Nina. Although the rough periodicity of ENSO events is well known, it possesses also long-term variability, the reason(s) for which is unknown.
This study offers an explanation of the ENSO variations, related to the lower stratospheric ozone and its control over the near tropopause temperature and humidity. Statistical analysis of the spatial distribution of connectivity between ozone and Nino3.4 index reveal strong coherence in their temporal variations, with the leading role of ozone. Additional analysis of the coupling between ozone at 70 hPa and water vapour at 150 hPa confirms the proposed mechanism for ozone influence on the near the tropopause water vapour and consequently on the regional pattern of surface temperature.