Articles | Volume 14, issue 23
Atmos. Chem. Phys., 14, 12803–12814, 2014
https://doi.org/10.5194/acp-14-12803-2014
Atmos. Chem. Phys., 14, 12803–12814, 2014
https://doi.org/10.5194/acp-14-12803-2014

Research article 05 Dec 2014

Research article | 05 Dec 2014

On the hiatus in the acceleration of tropical upwelling since the beginning of the 21st century

J. Aschmann et al.

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Short summary
This study compares observations and simulation results of ozone in the lower tropical stratosphere. It shows that ozone in this region decreased from 1985 up to about 2002, which is consistent with an increase in tropical upwelling predicted by climate models. However, the decrease effectively stops after 2002, indicating that significant changes in tropical upwelling have occurred. The most important factor appears to be that the vertical ascent in the tropics is no longer accelerating.
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