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

Atmospheric seasonal forecasts of the 20^th Century: multi-decadal variability in predictive skill of the winter North Atlantic Oscillation (NAO) and their potential value for extreme event attribution. By A. Weisheimer et al. in the Quarterly Journal of the Royal Meteorological Society.

Monsoon circulations and tropical heterogeneous chlorine chemistry in the stratosphere. By S. Solomon et al. in Geophysical Research Letters.

The Influence of Ozone Forcing on Blocking in the Southern Hemisphere. By F. Dennison et al. in the Journal of Geophysical Research: Atmospheres.

Long-range transport pathways of tropospheric source gases originating in Asia into the northern lower stratosphere during the Asian monsoon season 2012. By B. Vögel et al. in Atmospheric Chemistry and Physics.

Harmonisation and diagnostics of MIPAS ESA CH₄ and N₂O profiles using data assimilation. By Q. Errera et al. in Atmospheric Measurement Techniques.

Impact of interactive chemistry of stratospheric ozone on southern hemisphere paleoclimate simulation. By S. Noda et al. in the Journal of Geophysical Research: Atmospheres.

The major stratospheric final warming in 2016: dispersal of vortex air and termination of Arctic chemical ozone loss. By G.L. Manney and Z.D. Lawrence in Atmospheric Chemistry and Physics.

Heterogeneous reaction of ClONO₂ with TiO₂ and SiO₂ aerosol particles: implications for stratospheric particle injection for climate engineering. By M. Tang et al. in Atmospheric Chemistry and Physics.

Reduced Southern Hemispheric circulation response to quadrupled CO₂ due to stratospheric ozone feedback. By G. Chiodo and L.M. Polvani in Geophysical Research Letters.

Global atmospheric teleconnections during Dansgaard–Oeschger events. By B.R. Markle et al. in Nature Geoscience.

Stratospheric solar geoengineering without ozone loss. By D.W. Keith et al. in Proceedings of the National Academy of Sciences of the United States of America.

Initialization shock in decadal hindcasts due to errors in wind stress over the tropical Pacific. By H. Pohlmann et al. in Climate Dynamics.

Poleward eddy heat flux anomalies associated with recent Arctic sea-ice loss. By K. Hoshi et al. in Geophysical Research Letters.

A connection from Arctic stratospheric ozone to El Niño-Southern oscillation. By F. Xie et al. in Environmental Research Letters.

Multidecadal variations of the effects of the Quasi-Biennial Oscillation on the climate system. By S. Brönnimann et al. in Atmospheric Chemistry and Physics.

Directional gravity wave momentum fluxes in the stratosphere derived from high resolution AIRS temperature data. By M. Ern et al. in Geophysical Research Letters.

An upper-branch Brewer–Dobson circulation index for attribution of stratospheric variability and improved ozone and temperature trend analysis. By W.T. Ball et al. in Atmospheric Chemistry and Physics.

Stratospheric variability contributed to and sustained the recent hiatus in Eurasian winter warming. By C.I. Garfinkel et al. in Geophysical Research Letters.

Discussion papers – open for comment

HEPPA-II model-measurement intercomparison project: EPP indirect effects during the dynamically perturbed NH winter 2008–2009. By B. Funke et al. in Atmospheric Chemistry and Physics Discussions.

Widespread persistent polar stratospheric ice clouds in the Arctic. By C. Voigt et al. in Atmospheric Chemistry and Physics Discussions.

Changing trends and emissions of hydrochlorofluorocarbons and their hydrofluorocarbon replacements. By P.G. Simmonds et al. in Atmospheric Chemistry and Physics Discussions.