Paper No. 69-7
Presentation Time: 3:30 PM
CLUMPED ISOTOPE ANALYSES OF CARBONATES CONTAINED IN LOESS DEPOSITS TO CONSTRAIN TERRESTRIAL TEMPERATURE AND HYDROLOGICAL CHANGE THROUGH TIME
EAGLE, Robert1, MITSUNAGA, Bryce A.2, BRICKER, Hayley3, BATEMAN, Jesse B.4, MERING, John5, MITCHELL, Jonathan L.6, SEIBT, Ulrike6, NEELIN, David1, RISI, Camille7, LI, Gaojun8 and TRIPATI, Aradhna9, (1)Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA 90095, (2)Department of Earth, Planetary and Space Sciences, University of California, Los Angeles, 595 Charles E. Young Dr. East, Los Angeles, CA 90095, (3)Department of Earth & Planetary Space Sciences, University of California, Los Angeles, Los Angeles, CA 90024, (4)Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, 595 Charles Young Drive East, Los Angeles, CA 90095, (5)Department of Earth Sciences, University of Waikato, Hamilton, 3240, New Zealand, (6)Department of Atmospheric and Ocean Sciences, UCLA, Los Angeles, CA 90095, (7)Laboratoire de Météorologie Dynamique, CNRS, Paris, France, (8)MOE Key Laboratory of Surficial Geochemistry, Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu, China, (9)Department of Earth, Planetary, and Space Sciences, Department of Atmospheric and Oceanic Sciences, Institute of the Environment and Sustainability, Institute of Geophysics and Planetary Physics, University of California, Los Angeles, 595 Charles Young Drive East, Box 951567, Los Angeles, CA 90095
Loess records can serve as archives to resolve regional impacts of terrestrial environmental change. When applied to loess carbonates, including nodular concretionary carbonates, rhizoliths, and gastropod shells, carbonate clumped isotope thermometry has the potential to provide quantitative constraints on temperature and water δ18O. In monsoonal regions, gastropod clumped isotope compositions appear to record information on conditions during the months of the summer monsoon. Recent work indicates nodular carbonate concretions can have more complex provenance, potentially representing information on recent soil formation conditions at sites with low sedimentation rates, even in glacial age sediments, whereas at higher sedimentation rate sites, nodular carbonate concretions and land snails yield consistent data. In the case of the central Chinese loess plateau we present a case where quantitative temperature and water isotope reconstructions from loess deposits can be used to in direct comparison with isotope-enabled climate models to make inferences on model skill and changes in east Asian monsoon dynamics through time.
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