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

Increase in the potential predictability of the Arctic Oscillation via intensified teleconnection with ENSO after the mid-1990s. By D. Kang and M.-I. Lee et al. in Climate Dynamics.

Dry layers in the tropical troposphere observed during CONTRAST and global behavior from GFS analyses. By W.J. Randel et al. in the Journal of Geophysical Research: Atmospheres.

On the role of tropopause folds in summertime tropospheric ozone over the eastern Mediterranean and the Middle East. By D. Akritidis et al. in Atmospheric Chemistry and Physics.

Seasonal variability of stratospheric methane: implications for constraining tropospheric methane budgets using total column observations. By K.M. Saad et al. in Atmospheric Chemistry and Physics.

On the discrepancies in tropical belt expansion between reanalyses and climate models and among tropical belt width metrics. By N. Davis and T. Birner in the Journal of Climate.

Early action on HFCs mitigates future atmospheric change. By M.M. Horowitz et al. in Environmental Research Letters.

Comparison of simulated and observed convective gravity waves. By S. Kalisch et al. in the Journal of Geophysical Research: Atmospheres.

STEFLUX, a tool for investigating stratospheric intrusions: application to two WMO/GAW global stations. By D. Putero et al. in Atmospheric Chemistry and Physics.

Impact of global warming on the rise of volcanic plumes and implications for future volcanic aerosol forcing. By T.J. Aubry et al. in the Journal of Geophysical Research: Atmospheres.

Transport of Chemical Tracers from the Boundary Layer to Stratosphere Associated with the Dynamics of the Asian Summer Monsoon. By L.L. Pan et al. in the Journal of Geophysical Research: Atmospheres.

Was breaking the taboo on research on climate engineering via albedo modification a moral hazard, or a moral imperative? By M.G. Lawrence and P.J. Crutzen in Earth’s Future.

Discussion papers – open for comment

Long-lived contrails and convective cirrus above the tropical tropopause. By U. Schumann et al. in Atmospheric Chemistry and Physics Discussions.

Residual Mean Circulation and Temperature Changes during the Evolution of Stratospheric Sudden Warming Revealed in MERRA. By B.-G. Song and H.Y. Chun in Atmospheric Chemistry and Physics Discussions.