A selection of new science articles from the past week of interest to the SPARC community (a SPARC Office choice).

Impact of the 2009 major sudden stratospheric warming on the composition of the stratosphere. By M. Tao et al. in Atmospheric Chemistry and Physics.

New calibration noise suppression techniques for the GLORIA limb imager. By T. Guggenmoser et al. in Atmospheric Measurement Techniques.

Global and seasonal variations in three-dimensional gravity wave momentum flux from satellite limb sounding temperatures. By M.J. Alexander in Geophysical Research Letters.

Rapid increases in tropospheric ozone production and export from China. By W.W. Verstraeten et al. in Nature Geoscience.

A comparison of chemical mechanisms using tagged ozone production potential (TOPP) analysis. By J. Coates and T.M. Butler in Atmospheric Chemistry and Physics.

New and improved infrared absorption cross sections for dichlorodifluoromethane (CFC-12). By J.J. Harrison in Atmospheric Measurement Techniques.

Tropospheric ozone and its precursors from the urban to the global scale from air quality to short-lived climate forcer. By P.S. Monks et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

The tropopause inversion layer in baroclinic life cycles experiments: the role of diabatic and mixing processes. By D. Kunkel et al. in Atmospheric Chemistry and Physics Discussions.

Radiative and climate impacts of a large volcanic eruption during stratospheric sulfur geoengineering. By A. Laakso et al. in Atmospheric Chemistry and Physics Discussions.