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

What makes an annular mode “annular”? By E.P. Gerber and D.W.J. Thompson in the Journal of the Atmospheric Sciences.

Intercomparison and evaluation of satellite peroxyacetyl nitrate observations in the upper troposphere–lower stratosphere. By R.J. Pope et al. in Atmospheric Chemistry and Physics.

Vortex splitting on a planetary scale in the stratosphere by cyclogenesis on a sub planetary scale in the troposphere. By A. O’Neill et al. in the Quarterly Journal of the Royal Meteorological Society.

The effect of a well-resolved stratosphere on East Asian winter climate. By K. Wei et al. in Climate Dynamics.

Changes of the tropical tropopause layer under global warming. By P. Lin et al. in the Journal of Climate.

Discussion papers – open for comment

The role of methane in projections of 21st century stratospheric water vapour. By L.E. Revell et al. in Atmospheric Chemistry and Physics Discussions.

Impact of typhoons on the composition of the upper troposphere within the Asian summer monsoon anticyclone: the SWOP campaign in Lhasa 2013. By D. Li et al. in Atmospheric Chemistry and Physics Discussions.

Global large-scale stratosphere-troposphere exchange in modern reanalyses. By A.C. Boothe and C.R. Homeyer in Atmospheric Chemistry and Physics Discussions.

Stratospheric Variability at a glance – Analysis of the intra decadal timescale and the QBO. By D. Cai et al. in Atmospheric Chemistry and Physics Discussions.

Consistency between GRUAN sondes, LBLRTM and IASI. By X. Calbet et al. in Atmospheric Measurement Techniques Discussions.