Quantifying Carbon Cycling across the Groundwater–Stream–Atmosphere Continuum Using High-Resolution Time Series of Multiple Dissolved Gases

• DOI: 10.1021/acs.est.3c03378
• Publication Date: 2023-08-29T17:20:03Z
• Authors: Chuan Wang; Matthias S. Brenn...; Yueqing Xie; James L. McCallum; Rolf Kipfer; Xin Dai; Jichun Wu
• Keywords: Biogeochemical Cycle; Cycling; Carbon fibers

The quantification of carbon cycling across the groundwater-stream-atmosphere continuum (GSAC) is crucial for understanding regional and global cycling. However, this remains challenging due to highly coupled exchange turnover in GSAC. Here, we disentangled processes a representative transect by obtaining numerically simulating high-resolution time series dissolved He, Ar, Kr, O2, CO2, CH4 concentrations. results revealed that groundwater contributed ∼60% CO2 ∼30% inputs stream, supporting stream emissions atmosphere. Furthermore, diurnal variations metabolism (-0.6 0.6 mol O2 m-2 day-1) induced pronounced carbonate precipitation during day dissolution at night. significant variability biogeochemical emphasizes importance investigations dynamics. This study shows gases are promising environmental tracers discerning quantifying GSAC with high spatiotemporal resolution. Our provides process-oriented mechanistic