At the 23^rd SPARC Scientific Steering Group meeting held from 10-13 November 2015 in Boulder, Colorado, USA, the emerging activities on Polar Stratospheric Clouds (PSCi), Quasi-Biennial Oscillation (QBOi), and Carbon Tetrachloride (CCl₄) were accepted as full SPARC activities.

Find more information about:

• Polar Stratospheric Clouds
• QBO initiative: Towards improving the Quasi-Biennial Oscillation in global models
• CCl₄ (or CTC): Solving the mystery of Carbon Tetrachloride