Synergy between lacustrine groundwater discharge and dissolved organic matter in regulating seasonal CH4 and CO2 emissions in an ice–covered lake–groundwater system - Yuanzhen Zhao; Lijuan Hu; Shen Qu; Heyang Sun; Chengcheng Xia; Chao Gu; Xu Yang; Zhongli Wang; Limin Duan; Xiaomin Liu; Ruihong Yu (Journal of Hydrology, 2026)