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

What controls stratospheric water vapor in the NH summer monsoon regions? By W.J. Randel et al. in the Journal of Geophysical Research: Atmospheres.

Importance of latent heat release in ascending air streams for atmospheric blocking. By S. Pfahl et al. in Nature Geoscience.

Injection of iodine to the stratosphere. By A. Saiz-Lopez et al. in Geophysical Research Letters.

Sources of Seasonal Variability in Tropical UTLS Water Vapor and Ozone: Inferences from the Ticosonde Dataset at Costa Rica. By M.R. Schoeberl et al. in the Journal of Geophysical Research: Atmospheres.

The Interaction between the Tropopause Inversion Layer and the Inertial Gravity Wave activities revealed by radiosonde observations at a midlatitude station. By Y. Zhang et al. in the Journal of Geophysical Research: Atmospheres.

Modeling and mechanisms of polar winter upper stratosphere lower mesosphere disturbances in WACCM. By K. Greer et al. in the Journal of Geophysical Research: Atmospheres.

Tropospheric ozone variability in the tropics from ENSO to MJO and shorter timescales. By J.R. Ziemke et al. in Atmospheric Chemistry and Physics.

Comparison of co-located independent ground-based middle-atmospheric wind and temperature measurements with Numerical Weather Prediction models. By A. Le Pichon et al. in the Journal of Geophysical Research: Atmospheres.

Discussion papers – open for comment

Updated ozone absorption cross section will reduce air quality compliance. By E.D. Sofen et al. in Atmospheric Chemistry and Physics Discussions.