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

The radiative role of ozone and water vapour in the annual temperature cycle in the tropical tropopause layer. By A. Ming et al. in Atmospheric Chemistry and Physics.

The Climate-system Historical Forecast Project: providing open access to seasonal forecast ensembles from centers around the globe. By A.M. Tompkins et al. in the Bulletin of the American Meteorological Society.

Discussion papers – open for comment

An island in the stratosphere – On the enhanced annual variation of water vapour in the middle and upper stratosphere in the southern tropics and subtropics. By S. Lossow et al. in Atmospheric Chemistry and Physics Discussions.

Analyzing trace gas filaments in the Ex-UTLS by 4D-variational assimilation of airborne tomographic retrievals. By A. Vogel et al. in Atmospheric Chemistry and Physics Discussions.

The US Dobson Station Network Data Record Prior to 2015, Re-evaluation of NDACC and WOUDC archived records with WinDobson processing software. By R.D. Evans et al. in Atmospheric Chemistry and Physics Discussions.