Formation mechanisms of a severe springtime ozone episode in the Beibu Gulf, China: The role of the marine “ozone pool” and regional transport - Runxi Pan; Fei Jiang; Shuzhuang Feng; Dewei Yang; Yuning Xie; Hang Li; Yu He; Mengwei Jia; Yanhong Xie; Bei Chen (Atmospheric Pollution Research, 2026)