Articles | Volume 17, issue 11
Atmos. Chem. Phys., 17, 6825–6838, 2017
Atmos. Chem. Phys., 17, 6825–6838, 2017

Research article 12 Jun 2017

Research article | 12 Jun 2017

Mean age of stratospheric air derived from AirCore observations

Andreas Engel1, Harald Bönisch1,a, Markus Ullrich1, Robert Sitals1, Olivier Membrive2, Francois Danis2, and Cyril Crevoisier2 Andreas Engel et al.
  • 1Institute for Atmospheric and Environmental Science, Goethe University Frankfurt, Frankfurt, Germany
  • 2Laboratoire de Météorologie Dynamique (LMD/IPSL), CNRS, Ecole polytechnique, Université Paris-Saclay, Palaiseau, France
  • anow at: Karlsruhe Institute of Technology, KIT, Karlsruhe, Germany

Abstract. Mean age of stratospheric air can be derived from observations of sufficiently long-lived trace gases with approximately linear trends in the troposphere. Mean age can serve as a tracer to investigate stratospheric transport and long-term changes in the strength of the overturning Brewer–Dobson circulation of the stratosphere. For this purpose, a low-cost method is required in order to allow for regular observations up to altitudes of about 30 km. Despite the desired low costs, high precision and accuracy are required in order to determine mean age. We present balloon-borne AirCore observations from two midlatitude sites: Timmins in Ontario/Canada and Lindenberg in Germany. During the Timmins campaign, five AirCores sampled air in parallel with a large stratospheric balloon and were analysed for CO2, CH4 and partly CO. We show that there is good agreement between the different AirCores (better than 0.1 %), especially when vertical gradients are small. The measurements from Lindenberg were performed using small low-cost balloons and yielded very comparable results. We have used the observations to extend our long-term data set of mean age observations at Northern Hemisphere midlatitudes. The time series now covers more than 40 years and shows a small, statistically non-significant positive trend of 0.15 ± 0.18 years decade−1. This trend is slightly smaller than the previous estimate of 0.24 ± 0.22 years decade−1 which was based on observations up to the year 2006. These observations are still in contrast to strong negative trends of mean age as derived from some model calculations.

Short summary
AirCore is new technique for sampling stratospheric air. We present new observations of CO2 and CH4 using AirCore and derive stratospheric transport time, called the mean age of air. The purpose of using AirCore is to provide a cost-effective tool for deriving mean age. Mean age may serve as a proxy to investigate changes in stratospheric circulation. We show that there is no statistically significant trend in our 40-year time series of mean age, which is now extended using AirCore.
Final-revised paper