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

The extraordinarily strong and cold polar vortex in the early northern winter 2015/16. By V. Matthias et al. in Geophysical Research Letters.

Movement, drivers and bimodality of the South Asian High. By M. Nützel et al. in Atmospheric Chemistry and Physics.

Distinguishing stratospheric sudden warmings from ENSO as key drivers of wintertime climate variability over the North Atlantic and Eurasia. By L.M. Polvani et al. in the Journal of Climate.

A case study of long gravity wave crests in noctilucent clouds and their origin in the upper tropospheric jet stream. By P. Dalin et al. in the Journal of Geophysical research: Atmospheres.

Accuracy, precision, and temperature dependence of Pandora total ozone measurements estimated from a comparison with the Brewer triad in Toronto. By X. Zhao et al. in Atmospheric Measurement Techniques.

Discussion papers – open for comment

Trace gas composition in the Asian summer monsoon anticyclone: A case study based on aircraft observations and model simulations. By K.D. Gottschaldt et al. in Atmospheric Chemistry and Physics Discussions.

Quantifying the vertical transport of CHBr₃ and CH₂Br₂ over the Western Pacific. By R. Butler et al. in Atmospheric Chemistry and Physics Discussions.

Changes to the chemical state of the northern hemisphere atmosphere during the second half of the twentieth century. By M.J. Newland et al. in Atmospheric Chemistry and Physics Discussions.

An Atlantic streamer in stratospheric ozone observations and SD-WACCM simulation data. By K. Hocke et al. in Atmospheric Chemistry and Physics Discussions.