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

Relative drifts and biases between six ozone limb satellite measurements from the last decade. By N. Rahpoe et al in Atmospheric Measurement Techniques.

Weather chains during the 2013/2014 winter and their significance for seasonal prediction. By H.W. Davies in Nature Geoscience.

Southward shift of the northern tropical belt from 1945 to 1980. By S. Brönniman et al. in Nature Geoscience.

Increase in HFC-134a emissions in response to the success of the Montreal Protocol. By A. Fortems-Cheiney et al in the Journal of Geophysical Research: Atmospheres.

A perturbed parameter model ensemble to investigate Mt. Pinatubo’s 1991 initial sulfur mass emission. By J.X. Sheng et al. in Atmospheric Chemistry and Physics.

Transport pathways of peroxyacetyl nitrate in the upper troposphere and lower stratosphere from different monsoon systems during the summer monsoon season. By S. Fadnavis et al. in Atmospheric Chemistry and Physics.

The detectability of climate engineering. By G. Bürger and U. Cubasch in the Journal of Geophysical Research: Atmospheres.

On the comparison between seasonal predictive skill of global circulation models: coupled versus uncoupled. By A.F. Beraki et al. in the Journal of Geophysical Research: Atmospheres.

Positive trends in Southern Hemisphere carbonyl sulfide (OCS). By S. Kremser et al. in Geophysical Research Letters.

Zonally uniform tidal oscillations in the tropical stratosphere. By T. Sakazaki et al. in Geophysical Research Letters.

The direct fitting approach for total ozone column retrievals: a sensitivity study on GOME-2/MetOp-A measurements. By A. Wassmann et al. in Atmospheric Measurement Techniques.

Influences of source conditions on mountain wave penetration into the stratosphere and mesosphere. By B. Kaifler et al. in Geophysical Research Letters.

Ozone depletion by hydrofluorocarbons. By M.M. Hurwitz et al. in Geophysical Research Letters.

Modelling marine emissions and atmospheric distributions of halocarbons and dimethyl sulfide: the influence of prescribed water concentration vs. prescribed emissions. By S.T. Lennartz et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

A Lagrangian description on the troposphere-to-stratosphere transport changes associated with the stratospheric water drop around the year 2000. By F. Hasebe and T. Noguchi in Atmospheric Chemistry and Physics Discussions.

Variational data assimilation for the optimized ozone initial state and the short-time forecasting. By S.-Y. Park et al. in Atmospheric Chemistry and Physics Discussions.