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Atmospheric Hydrogen Variability in Flooded Areas of the Yangtze River Delta
Zhangliang Han1,2,3, Xinlong Wang1,2, Na Guo1,2
1Zhejiang Carbon Neutral Innovation Institute & Zhejiang International Cooperation Base for Science and Technology on Carbon Emission Reduction and Monitoring & State Key Laboratory of Green Chemical Synthesis and Conversion, Zhejiang University of Technology, Hangzhou 310032, People's Republic of China.
Abstract:
Terrestrial aquatic ecosystems may constitute substantially underestimated sources of atmospheric H2, an indirect greenhouse gas with growing significance as the hydrogen economy expands. We conducted a 22 month observational campaign across three sites in China's Yangtze River Delta: a regional background station (LAN), a site with extensive lakes (LK), and a paddy field and a wetland-dominated site (PF-WL). Mean H2 concentrations at LK and PF-WL (1454 and 1503 ppb) were all 2.5-2.6 times higher than the global average. Critically, ΔH2/ΔCO ratios at LK (1.22) and PF-WL (1.98) substantially exceeded the conventional combustion range (0.27-0.9), while strong H2-CH4 correlations (Pearson's r = 0.33-0.44) identified flooded ecosystems as potential H2 sources. At LAN, soil processes dominated with summer peaks driven by temperature-precipitation interactions. LK appeared to reflect mixed anthropogenic and lake sediment influences, whereas PF-WL was more strongly influenced by a combination of anthropogenic emissions and emissions from rice paddies and wetlands. Our findings suggest that aquatic ecosystem emissions may represent an important but previously underappreciated component of regional H2 budgets and that excluding them could introduce substantial uncertainty into hydrogen inventories in monsoon-affected subtropical regions.
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