Stratospheric Mean Ages and Transport Rates from Observations of Carbon Dioxide and Nitrous Oxide

KA Boering; SC Wofsy; BC Daube; HR Schneider; M Loewenstein; JR Podolske; TJ Conway

doi:10.1126/science.274.5291.1340

Stratospheric Mean Ages and Transport Rates from Observations of Carbon Dioxide and Nitrous Oxide

Science. 1996 Nov 22;274(5291):1340-3. doi: 10.1126/science.274.5291.1340.

Authors

KA Boering¹, SC Wofsy, BC Daube, HR Schneider, M Loewenstein, JR Podolske, TJ Conway

Affiliation

¹ K. A. Boering, S. C. Wofsy, B. C. Daube, H. R. Schneider, Division of Engineering and Applied Sciences and the Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA. M. Loewenstein and J. R. Podolske, NASA Ames Research Center, Moffett Field, CA 94035, USA. T. J. Conway, Climate Monitoring and Diagnostics Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80303, USA.

PMID: 8910266
DOI: 10.1126/science.274.5291.1340

Abstract

Measurements of stratospheric carbon dioxide (CO2) and nitrous oxide (N2O) concentrations were analyzed to investigate stratospheric transport rates. Temporal variations in tropospheric CO2 were observed to propagate into the stratosphere, showing that tropospheric air enters the lower tropical stratosphere continuously, ascends, and is transported rapidly (in less than 1 month) to both hemispheres. The mean age A of stratospheric air determined from CO2 data is approximately 5 years in the mid-stratosphere. The mean age is mathematically equivalent to a conserved tracer analogous to exhaust from stratospheric aircraft. Comparison of values for A from models and observations indicates that current model simulations likely underestimate pollutant concentrations from proposed stratospheric aircraft by 25 to 100 percent.