Snow Nitrate Isotopes in Central Antarctica Record the Prolonged Period of Stratospheric Ozone Depletion From ?1960 to 2000

Interpretation of NO3? variability recorded in ice cores remains challenging as it can be lost from snow. Here, we present 60-year records and its isotopic composition (?15N, ?18O, ?17O) snow central Antarctica, Dome A. In the upper ?90 cm snowpack, variations concentration are dominated by photolytic loss, ?18O ?17O associated with recycling NOx to condensed phase driven photolysis. deeper snowpack (?1960–2000), observe prolonged trends NO3?, which best explained enhanced photolysis due long-term decreasing total column ozone (TCO). That is, period isotopes extremely low accumulation sites such A relay information on TCO consequently surface solar ultraviolet radiation over time.