NCKF - Ozone

We here present results of a study performed as part of the Danish National Centre for Climate Reseach (NCKF).

The objective of this study to investigate polar stratospheric conditions relevant for ozone depletion studied with Radio Occultation (RO) data.

The focus in the first phases will be on the temperature trends in the stratosphere and the volume in the atmosphere where polar stratospheric clouds (PSC) form during the polar winter. PSCs and ozone depletion is tightly connected.

The purpose of this study is a) to investigate methods for quantifying the volume,VPSC, from GNSS-RO stratospheric temperature and pressure data, and b) to investigate the long-term variability and trends of tratospheric temperatures conducive to the formation of PSCs. The objectives with these investigations are to further our understanding of role played by climate change for the evolution of ozone-depleting conditions in the Arctic, but also to lay the foundations for an operational service at DMI to monitor these conditions as they evolve day by day during the winter-spring seasons in the Arctic and Antarctic.

At present we present daily updated temperature measurements in the stratosphere and volume of PSC-forming areas over the polar regions. At a later stage additional results on PSC and vortex will be included.





Latest news

Average PSC-volume for October. (Data: NCKF/ROM SAF)
Area of the ozone hole over Antarctic. Purple area is the minium and maximum for the period 1986-2019. Orange curve: Mean 1986-2019, Black: 2020, Red: 2021. (Data: NASA/ESA/EUMETSAT)


We have now calculated the average PSC volume for October, and as expected from the previous months it is large. A bit larger than last year and only a bit smaller than the top record from 2015. This years ozone hole seems so far to duplicate the 2020 version, this is exiting because in 2020 it set a new record from mid November and all through December.

You can follow the daily temperatures and PSC volumes in the menu on the left.

Next up: The polar vortex over the Arctic is beginning to take form, the temperatures are dropping, thus the PSC season is slowly starting in the northern hemisphere. We shall follow it closely.

This site is still in the development phase.

Contacts: Helge Jønch-Sørensen ( and Hans Gleisner (