Dynamics of soil carbonate growth in the tropical domain

Autor: Licht, Alexis, Kelson, Julia, Bergel, Shelly, Schauer, Andrew, Petersen, Sierra, Capirala, Ashika, Huntington, Kate, Dupont-Nivet, Guillaume, Win, Zaw, Wa Aung, Day
Přispěvatelé: Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers de Rennes (OSUR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS), SGF, CNRS, Laboratoire de Géologie de Lyon ou l’étude de la Terre, des planètes et de l’environnement, University of Washington [Seattle], University of Michigan [Ann Arbor], University of Michigan System, University of Potsdam = Universität Potsdam, University of Shwebo, University of Yangon, Sciencesconf.org, CCSD
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: 27e édition de la Réunion des Sciences de la Terre
27e édition de la Réunion des Sciences de la Terre, SGF, CNRS, Laboratoire de Géologie de Lyon ou l’étude de la Terre, des planètes et de l’environnement, Nov 2021, Lyon, France
27 ème Réunion des sciences de la Terre (RST 2021)
27 ème Réunion des sciences de la Terre (RST 2021), Nov 2021, Lyon, France. pp.618
Popis: National audience; Pedogenic carbonate is widespread at mid latitudes where combined warm and dryconditions favor soil carbonate growth in summer. The mechanisms and tempo ofpedogenic carbonate formation are less certain in the tropics. There, longer periods ofsoil water saturation and higher soil respiration enhance calcite dissolution,particularly during summer. However, pedogenic carbonate growth during summerseasons remains the assumption of most studies using stable and clumped isotopeproxies on paleosols.To test this assumption, we investigated stable and clumped isotope values fromQuaternary and Miocene pedogenic carbonates in the tropical monsoonal domain ofMyanmar along an annual rainfall gradient. We show that carbonate growth inMyanmar occurs in the coldest months of the year due to sustained rainfall from midspring to late fall. Carbonate growth timing locally varies from early winter to earlyspring; this trend is partly influenced by local rainfall amount, with growth at thewettest sites delayed to spring.The winter bias in carbonate growth temperatures found in both Quaternary andMiocene Burmese soils, which is so far unique amongst pedogenic carbonates,constitutes a potential signature for past tropical monsoonal (warm summer-wet)climates in paleosols. We propose that high soil moisture year-round in the tropicaldomain makes carbonate growth more episodic than in temperate ecosystems andparticularly sensitive to the seasonal distribution of rainfall. This sensitivity isfacilitated by high winter temperatures that allow carbonate precipitation to occuroutside of the warmest months of the year. This high seasonal sensitivity is expected tobe more prominent in the geological record during times with higher temperatures andgreater expansion of the tropical realm.
Databáze: OpenAIRE
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