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

A negative phase shift of the winter AO/NAO due to the recent Arctic sea-ice reduction in late autumn. By T. Nakamura et al. in the Journal of Geophysical Research: Atmospheres.

The effects of springtime mid-latitude storms on trace gas composition determined from the MACC reanalysis. By K.E. Knowland et al. in Atmospheric Chemistry and Physics.

Rapid transport of East Asian pollution to the deep tropics. By M.J. Ashfold et al. in Atmospheric Chemistry and Physics.

The impact of temperature vertical structure on trajectory modeling of stratospheric water vapor. By T. Wang et al. in Atmospheric Chemistry and Physics.

The influence of ENSO on northern mid-latitude ozone during the winter to spring transition. By J. Zhang et al. in the Journal of Climate.

Discussion Papers – open for comment

Nonlinear response of modeled stratospheric ozone to changes in greenhouse gases and ozone depleting substances in the recent past. By S. Meul et al. in Atmospheric Chemistry and Physics Discussions.

Stratospheric geoengineering impacts on El Niño/Southern Oscillation. By C.J. Gabriel and A. Robock in Atmospheric Chemistry and Physics Discussions.