| In freshwaters, dissolved organic matter (DOM) constitutes a major flux of organic matter, and the quality of DOM has implications for instream OM processing. DOM quality is variable among small streams and across time, and streamflow intermittence may affect DOM inputs and processing rates. These patterns are likely to vary seasonally and across years due to variability in climate, and the implications of this variance on carbon cycling are poorly understood. To address this, we conducted synoptic sampling of DOC concentration and DOM quality across seasons at an intermittent stream in semi-arid southeastern Idaho during a drought. Our findings suggest that intermittence effects on DOC and DOM mechanistically and temporally differ during drought years compared to higher flow years. These findings highlight that DOC and DOM dynamics in intermittent streams can substantially vary across seasons and among years, and these dynamics are likely to be altered due to climate change. |