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

Do split and displacement sudden stratospheric warmings have different annular mode signatures? By A.C. Maycock and P. Hitchcock in Geophysical Research Letters.

Inertia gravity wave in the stratosphere and mesosphere observed by Doppler wind and temperature lidar. By G. Baumgartner et al. in Geophysical Research Letters.

Recent Hadley cell expansion: the role of internal atmospheric variability in reconciling modeled and observed trends. By C. Garfinkel et al. in Geophysical Research Letters.

The switching between zonal and blocked mid-latitude atmospheric circulation: a dynamical system perspective. By C. Faranda et al. in Climate Dynamics.

Improved stratospheric aerosol extinction profiles from SCIAMACHY: validation and sample results. By C. von Savigny et al. in Atmospheric Measurement Techniques.

Validation of MIPAS IMK/IAA methane profiles. By A. Laeng et al. in Atmospheric Measurement Techniques.

Effects of stratospheric variability on El Niño teleconnections. By J.H. Richter et al. in Environmental Research Letters.

Discussion papers – open for comment

First continuous ground-based observations of long period oscillations in strato-/mesospheric wind profiles. By R. Rüfenacht et al. in Atmospheric Chemistry and Physics Discussions.

Long-term trend analysis and climatology of tropical cirrus clouds using 16 years of lidar data set over Southern India. By A.K. Pandit et al. in Atmospheric Chemistry and Physics Discussions.