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Small Catchments Sustain Silicon Signatures Following Storms

Justin Rowell by Justin Rowell
29.09.2022
Home Space

Northern California’s Eel River watershed

Source: Journal of Geophysical Research: Biogeosciences

The outer skin of our planet—the critical zone—stretches from treetops to the lower limits of groundwater. In this layer, interactions between rock, soil, water, air, and living organisms shape Earth’s surface and sustain life. Silicate weathering, for example, influences global climate by removing carbon dioxide from the atmosphere and contributes nutrients to diverse ecosystems.

However, scientists have largely overlooked the contributions of storms to silicate weathering. Rainfall and snowmelt can send huge amounts of fluid through watersheds, which clears out molecules produced by weathering reactions. Ignoring these effects could provide misleading conclusions about silicate weathering in drainage networks.

In a new study, Fernandez et al. analyzed stream water samples from six small catchments in French, Canadian, and U.S. critical zone networks and discovered they had unique patterns of silicon chemical and isotopic export. The researchers developed a combined model that identified two factors behind these differences. One driver was site-specific differences in hydrological routing. The second was the unique combination of biogeochemical reactions in each catchment.

The team found that these unique silicon signatures were preserved following storm events and the patterns after storms were consistent with longer-term data sets, suggesting that data from storm events could serve as proxies of long-term silica weathering dynamics. According to the authors, an area of future study could be whether watershed silicon signatures continue to remain resilient in the face of more frequent severe storms due to global warming. (Journal of Geophysical Research: Biogeosciences, https://doi.org/10.1029/2021JG006660, 2022)

—Jack Lee, Science Writer

Citation: Lee, J. (2022), Small catchments sustain silicon signatures following storms, Eos, 103, https://doi.org/10.1029/2022EO220274. Published on 10 June 2022.

Text © 2022. AGU. CC BY-NC-ND 3.0
Except where otherwise noted, images are subject to copyright. Any reuse without express permission from the copyright owner is prohibited.


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