Discontinuity between PI control and historical ozone

[MartinDix]

Dataset source ID(s)

FZJ-CMIP-ozone-1-2

Describe the issue

There is a discontinuity between the PI control climatology and the historical ozone. The 1829-1849 mean from the v20251025 dataset matches the 1850 climatology but it's discontinuous at 1850.

Expected data

I expected a smooth transition from climatology to historical. Data description for the 1829-1849 data says "This transient piControl forcing includes the QBO signal but uses average solar forcing and repeating 1850 emissions.". Why does switching to evolving solar forcing and emissions give a systematic shift in ozone?

Screenshots

[znichollscr]

@hegglinm any advice here for @MartinDix ?

[hegglinm]

@MartinDix @znicholls Thanks for bringing this issue to my attention. I will need a few days to get to the bottom of it. Will update you as soon as I know more.