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

Changes to the chemical state of the Northern Hemisphere atmosphere during the second half of the twentieth century. By M.J. Newland et al. in Atmospheric Chemistry and Physics.

Evaluation of ACCMIP ozone simulations and ozonesonde sampling biases using a satellite-based multi-constituent chemical reanalysis. By K. Miyazaki and K. Bowman in Atmospheric Chemistry and Physics.

Impacts of meteoric sulfur in the Earth’s atmosphere. By J.C. Gomez Martin et al. in the Journal of Geophysical Research: Atmospheres.

Validation of 10-year SAO OMI Ozone Profile (PROFOZ) product using ozonesonde observations. By G. Huang et al. in Atmospheric Measurement Techniques.

The influence of extratropical cloud phase and amount feedbacks on climate sensitivity. By W.R. Frey and J.E. Kay in Climate Dynamics.

Exploring gravity wave characteristics in 3-D using a novel S-transform technique: AIRS/Aqua measurements over the Southern Andes and Drake Passage. By C.J. Wright et al. in Atmospheric Chemistry and Physics.

Discussion papers – open for comment

BrO and Bry profiles over the Western Pacific: Relevance of Inorganic Bromine Sources and a Bry Minimum in the Aged Tropical Tropopause Layer. By T.K. Koenig et al. in Atmospheric Chemistry and Physics Discussions.

Chemistry-climate model simulations of the Mt. Pinatubo eruption using CCMI and CMIP6 stratospheric aerosol data. By L. Revell et al. in Atmospheric Chemistry and Physics Discussions.

Tropospheric ozone and its precursors at Summit, Greenland: comparison between observations and model simulations. By Y. Huang et al. in Atmospheric Chemistry and Physics Discussions.

Atmospheric QBO and ENSO indices with high vertical resolution from GNSS radio occultation temperature measurements. By H. Wilhelmsen et al. in Atmospheric Measurement Techniques Discussions.