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

Missing orographic drag leads to climate model biases in jet streams, blocking and storm tracks. By F. Pithan et al. in Geophysical Research Letters.

Results from the validation campaign of the ozone radiometer GROMOS-C at the NDACC station of Réunion island. By S. Fernandez et al. in Atmospheric Chemistry and Physics.

MJO-related intraseasonal variation of gravity waves in the southern hemisphere tropical stratosphere revealed by high-resolution airs observations. By C. Tsuchiya et al. in the Journal of Geophysical Research: Atmospheres.

Diverse policy implications for future ozone and surface UV in a changing climate. By A.H. Butler et al. in Environmental Research Letters.

Strong modification of stratospheric ozone forcing by cloud and sea-ice adjustments. By Y. Xia et al. in Atmospheric Chemistry and Physics.

The Sub-seasonal to Seasonal Prediction (S2S) Project Database. By F. Vitart et al in the Bulletin of the American Meteorological Society.

Tracking the delayed response of the northern winter stratosphere to ENSO using multi reanalyses and model simulations. By R. Ren et al. in Climate Dynamics.

Understanding the links between subtropical and extratropical circulation responses to climate change using aquaplanet model simulations. By T. Shaw and A. Voigt in the Journal of Climate.

Discussion papers – open for comment

Lidar studies on microphysical influences on the structure and lifetime of tropical cirrus clouds. By G.S. Motty et al. in Atmospheric Chemistry and Physics Discussions.

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