Co-variation of silicate, carbonate and sulfide weathering drives CO2 release with erosion
| Autor: | H. J. Hassenruck-Gudipati, Albert Galy, Aaron Bufe, Jeremy K. Caves Rugenstein, Jui-Ming Chang, Robert Emberson, Niels Hovius |
|---|---|
| Přispěvatelé: | German Research Centre for Geosciences - Helmholtz-Centre Potsdam (GFZ), Universität Potsdam, NASA Goddard Space Flight Center (GSFC), Colorado State University [Fort Collins] (CSU), Centre de Recherches Pétrographiques et Géochimiques (CRPG), Université de Lorraine (UL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Jackson School of Geosciences (JSG), University of Texas at Austin [Austin], National Taïwan University (NTU) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
010504 meteorology & atmospheric sciences Sulfide Geochemistry Weathering 15. Life on land Carbon sequestration 010502 geochemistry & geophysics 01 natural sciences Silicate Sulfide minerals chemistry.chemical_compound chemistry 13. Climate action [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU]Sciences of the Universe [physics] Carbon dioxide Erosion General Earth and Planetary Sciences Carbonate 0105 earth and related environmental sciences |
| Zdroj: | Nature Geoscience Nature Geoscience, Nature Publishing Group, 2021, 14 (4), pp.211-216. ⟨10.1038/s41561-021-00714-3⟩ |
| ISSN: | 1752-0894 |
| Popis: | Global climate is thought to be modulated by the supply of minerals to Earth’s surface. Whereas silicate weathering removes carbon dioxide (CO2) from the atmosphere, weathering of accessory carbonate and sulfide minerals is a geologically relevant source of CO2. Although these weathering pathways commonly operate side by side, we lack quantitative constraints on their co-variation across erosion rate gradients. Here we use stream-water chemistry across an erosion rate gradient of three orders of magnitude in shales and sandstones of southern Taiwan, and find that sulfide and carbonate weathering rates rise with increasing erosion, while silicate weathering rates remain steady. As a result, on timescales shorter than marine sulfide compensation (approximately 106–107 years), weathering in rapidly eroding terrain leads to net CO2 emission rates that are at least twice as fast as CO2 sequestration rates in slow-eroding terrain. We propose that these weathering reactions are linked and that sulfuric acid generated from sulfide oxidation boosts carbonate solubility, whereas silicate weathering kinetics remain unaffected, possibly due to efficient buffering of the pH. We expect that these patterns are broadly applicable to many Cenozoic mountain ranges that expose marine metasediments. Unlike sulfide and carbonate, silicate weathering does not increase with physical erosion, which could result in a net release of carbon dioxide associated with uplift, according to stream-water chemistry of southern Taiwan. |
| Databáze: | OpenAIRE |
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