No abstract

From a climate change perspective, ozone is the third most important greenhouse gas (after CO 2 and CH 4 ) and its radiative forcing is proportional to the global tropospheric ozone burden, which contributes to global warming on relatively long timescales of decades (see Chapter 7 of IPCC AR6, 2021). Therefore, long-term ozone trends at remote sites and in the free troposphere are typically based on observations from all months of the year, in addition to seasonal-based analyses (