Seasonal reversal of river–groundwater exchange controls dissolved organic matter dynamics across the arid margin of the Tibetan Plateau - Bing Yi; Jingtao Liu; Yong-Sik Ham; Fei Liu; Shanshan Yang; Liang Zhu; Yuxi Zhang; Xiaorui Chen; Wei Kang; Chenpan Gong; Bei Li; Bing Zhou; et al. (Water Research, 2026)