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

Observational constraints on the efficiency of dehydration mechanisms in the tropical tropopause layer. A.W. Rollins et al. in Geophysical Research Letters.

Climatic impacts of stratospheric geoengineering with sulfate, black carbon and titania injection. By A.C. Jones et al. in Atmospheric Chemistry and Physics.

Drivers of changes in stratospheric and tropospheric ozone between year 2000 and 2100. By A. Banarjee et al. in Atmospheric Chemistry and Physics.

The influence of atmospheric blocking on extreme winter minimum temperatures in North America. By K. Whan et al. in the Journal of Climate.

Tropical Upper Tropospheric Potential Vorticity Intrusions During Sudden Stratospheric Warmings. By J.R. Albers et al. in the Journal of Atmospheric Sciences.

The impact of a future solar minimum on climate change projections in the Northern Hemisphere. By G. Chiodo et al. in Environmental Research Letters.

Taking the chill off: Future Arctic sea-ice loss reduces severity of cold air outbreaks in midlatitudes. By B. Ayarzagüena and J.A. Screen in Geophysical Research Letters.

On the formation of tropical rings of atomic halogens: Causes and implications. By A. Saiz-Lopez and R. P. Fernandez in Geophysical Research Letters.

The impact of the direct effects of sulfate and black carbon aerosols on the sub-seasonal march of the East Asian subtropical summer monsoon. By D. Wang et al. in the Journal of Geophysical Research: Atmospheres.

The airborne mass spectrometer AIMS – Part 1: AIMS-H₂O for UTLS water vapor measurements. By S. Kaufmann et al. in Atmospheric Measurement Techniques.

Decadal climate predictions using sequential learning algorithms. By E. Strobach and G. Bel in the Journal of Climate.

Ozone and carbon monoxide over India during the summer monsoon: regional emissions and transport. By N. Ojha et al. in Atmospheric Chemistry and Physics.

Stratospheric Gravity Wave Fluxes and Scales during DEEPWAVE. By R.B. Smith et al. in the Journal of Atmospheric Sciences.

The Convective Transport of Active Species in the Tropics (CONTRAST) Experiment. By L.L. Pan et al. in the Bulletin of the American Meteorological Society.

What is the Polar Vortex, and how does it influence weather? By D.W. Waugh et al. in the Bulletin of the American Meteorological Society.

Discussion papers – open for comment

UV and Infrared Absorption Spectra, Atmospheric Lifetimes, and Ozone Depletion and Global Warming Potentials for CCl₂FCCl₂F (CFC-112), CCl₃CClF₂ (CFC-112a), CCl₃CF₃ (CFC-113a), and CCl₂FCF₃ (CFC-114a). By M.E. Davis et al. in Atmospheric Chemistry and Physics Discussions.

Hybrid ensemble 4DVar assimilation of stratospheric ozone using a global shallow water model. By D.R. Allen et al. in Atmospheric Chemistry and Physics Discussions.

An update on the uncertainties of water vapor measurements using Cryogenic Frostpoint Hygrometers. By H. Vömel et al. in Atmospheric Measurement Techniques Discussions.

A comparative analysis of UV nadir-backscatter and infrared limb-emission ozone data assimilation. By R. Dragani in Atmospheric Chemistry and Physics Discussions.

Representing the effects of stratosphere-troposphere exchange on 3D O₃ distributions in chemistry transport models using a potential vorticity based parameterization. By J. Xing et al. in Atmospheric Chemistry and Physics Discussions.