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. In this work, we analyze the seasonal dependence of ozone trends in the stratosphere using four long-term merged data sets, SAGE-CCI-OMPS, SAGE-OSIRIS-OMPS, GOZCARDS, and SWOOSH, which provide more than 30 years ofmonthly zonal mean ozone profiles in the stratosphere. We focus here ontrends between 2000 and 2018. All data sets show similar results, although some discrepancies are observed. In the upper stratosphere, the trends arepositive throughout all seasons and the majority of latitudes. The largestupper-stratospheric ozone trends are observed during local winter (up to 6 % per decade) and equinox (up to 3 % per decade) at mid-latitudes. Inthe equatorial region, we find a very strong seasonal dependence of ozonetrends at all altitudes: the trends vary from positive to negative, with thesign of transition depending on altitude and season. The trends are negativein the upper-stratospheric winter (−1 % per decade to −2 % per decade) and in the lower-stratospheric spring (−2 % per decade to −4 % per decade), but positive (2 % per decade to 3 % per decade) at 30–35 km in spring, while the opposite pattern is observed in summer. The tropical trends below 25 km are negative and maximize duringsummer (up to −2 % per decade) and spring (up to −3 % per decade). In the lower mid-latitude stratosphere, our analysis points to a hemisphericasymmetry: during local summers and equinoxes, positive trends are observed in the south (+1 % per decade to +2 % per decade), while negative trends are observed in the north (−1 % per decade to −2 % per decade). We compare the seasonal dependence of ozone trends with available analysesof the seasonal dependence of stratospheric temperature trends. We find thatozone and temperature trends show positive correlation in the dynamicallycontrolled lower stratosphere and negative correlation above 30 km, where photochemistry dominates. Seasonal trend analysis gives information beyond that contained in annualmean trends, which can be helpful in order to better understand the role ofdynamical variability in short-term trends and future ozone recoverypredictions.

Seasonal stratospheric ozone trends over 2000–2018 derived from several merged data sets