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

Advanced stratospheric data processing of radio occultation with a variational combination for multi-frequency GNSS signals. By T.-K. Wee and Y.-H. Kuo in the Journal of Geophysical Research: Atmospheres.

Processes controlling water vapor in the upper troposphere / lowermost stratosphere: An analysis of eight years of monthly measurements by the IAGOS-CARIBIC observatory. By A. Zahn et al. in the Journal of Geophysical Research: Atmospheres.

Effect of the Arakan Mountains in the Northwestern Indochina Peninsula on the Late-May Asian Monsoon Transition. By C.-H. Wu et al. in the Journal of Geophysical Research: Atmospheres.

Stratospheric and mesospheric HO₂ observations from the Aura Microwave Limb Sounder. By L. Millán et al. in Atmospheric Chemistry and Physics Discussions.

An evaluation of ozone dry deposition in global scale chemistry climate models. By C. Hardacre et al in Atmospheric Chemistry and Physics Discussions.

Global emissions of HFC-143a (CH₃CF₃) and HFC-32 (CH2F2) from in situ and air archive atmospheric observations. By S. O’Doherty et al. in Atmospheric Chemistry and Physics.

Changes in the composition of the northern polar upper stratosphere in February 2009 after a sudden stratospheric warming. By A. Damiani et al. in the Journal of Geophysical Research: Atmospheres.

Observational evidence for interhemispheric hydroxyl-radical parity. By P. Patra et al. in Nature.

Atmospheric chemistry: No equatorial divide for a cleansing radical. By A.M. Fiore in Nature.