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

The Deep Propagating Gravity Wave Experiment (DEEPWAVE): An Airborne and Ground-Based Exploration of Gravity Wave Propagation and Effects from their Sources throughout the Lower and Middle Atmosphere. By D. C. Fritts et al. in the Bulletin of the American Meteorological Society.

Comparing Sudden Stratospheric Warming Definitions in Reanalysis Data. By F.M. Palmeiro et al. in the Journal of Climate.

Impacts of Stratospheric Ozone Depletion and Recovery on Wave Propagation in the Boreal Winter Stratosphere. By D. Hu et al. in the Journal of Geophysical Research: Atmospheres.

Effects of volcanism on tropical variability. By N. Maher et al. in Geophysical Research Letters.

A coupled data assimilation system for climate reanalysis. By P. Laloyaux et al. in the Quarterly Journal of the Royal Meteorological Society.

Aircraft measurements of gravity waves in the upper troposphere and lower stratosphere during the START08 field experiment. By F. Zhang et al. in Atmospheric Chemistry and Physics.

An objective determination of optimal site locations for detecting expected trends in upper-air temperature and total column ozone. By K. Kreher et al. in Atmospheric Chemistry and Physics.

The southern stratospheric gravity wave hot spot: individual waves and their momentum fluxes measured by COSMIC GPS-RO. By N.P. Hindley et al. in Atmospheric Chemistry and Physics.

Onset of circulation anomalies during stratospheric vortex weakening events: the role of planetary-scale waves. By P. Martineau and S.-W. Son in the Journal of Climate.

Discussion papers – open for comment

Evaluation of the Australian Community Climate and Earth-System Simulator Chemistry-Climate Model. By K.A. Stone et al. in Atmospheric Chemistry and Physics Discussions.