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

Hadley cell expansion in CMIP6 models. By K.M. Griese and S.M. Davis in Atmospheric Chemistry and Physics.

The Research Unit VolImpact: Revisiting the volcanic impact on atmosphere and climate – preparations for the next big volcanic eruption. By C. von Savigny et al. in the Meteorologische Zeitschrift.

A New Theoretical Framework for Understanding Multiscale Atmospheric Predictability. By Y.Q. Sun and F. Zhang in the Journal of the Atmospheric Sciences.

Discussion papers – open for comment:

Influence of gravity wave temperature anomaly and its vertical gradient on cirrus clouds in the tropical tropopause layer – a satellite-based view. By K.-W. Chang and T. L’Ecuyer in Atmospheric Chemistry and Physics.

Transport model diagnosis of the mean age of air derived from stratospheric samples in the tropics. By H.T. Nguyen et al. in Atmospheric Chemistry and Physics.