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A global analysis on the relationship between water retention time and dissolved carbon across inland waters
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A global analysis on the relationship between water retention time and dissolved carbon across inland waters
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Journal Article
A global analysis on the relationship between water retention time and dissolved carbon across inland waters
2023
Overview
The transport of dissolved carbon (DC) from inland waters to the ocean is an important component of the global carbon cycle. However, how water retention time (WRT) affects the concentration and flux of DC in inland waters remains unclear. In this study, we collected 613 data points for WRT, the concentration and flux of dissolved organic carbon (DOC), inorganic carbon (DIC) and dissolved CO2 from 587 field studies and 26 model simulations worldwide. We found that the longer the WRT, the higher the DOC concentration is in inland waters. In other words, longer WRT and slower water velocity generally result in smaller DC flux in inland waters. More interestingly, the decreasing rate of DC flux in rivers is twice as much as that in lakes and reservoirs; thus, the magnitudes of riverine DOC and DIC fluxes are more sensitive to WRT than lakes and reservoirs. Besides, our analysis suggested that the DOC concentrations in inland waters are positively correlated with the WRT in the temperate zone because biotic production of carbon was greater than its consumption. In contrast, the concentration of DIC and CO2 in the temperate zone is negatively correlated with the WRT, respectively. In tropical and boreal regions, the DOC concentrations in inland waters are negatively correlated with the WRT because of high temperature- and rainfall-associated hydrologic dynamics in tropical regions and the widely distributed ice cover in the boreal regions. These findings have important implications for studying the global carbon cycle due to the significance of inland water in transporting carbon from land to ocean. Further study on the relationship between WRT and DC export in inland waters of the temperate zone is necessary, particularly for river systems.
