Glacial-interglacial changes in dust deposition on the Chinese Loess Plateau |
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| Institution: | 1. Laboratoire de Météorologie Dynamique (CNRS and Institute Pierre Simon Laplace, IPSL), Ecole Normale Supérieure, Paris Sciences & Lettres (PSL) Research University, 75005, Paris, France;2. Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, 10964, USA;3. Laboratoire de Géographie Physique, Environnements quaternaires et actuels, CNRS, 1 place A. Briand, 92195, Meudon Cedex, France;4. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Science, Xi’an, 710061, China;1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 10081, China;3. Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Land and Resources, Beijing 100081, China;1. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth and Environment, Chinese Academy of Sciences, Xi''An 710061, China;2. Luminescence Dating Laboratory, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;3. Joint Center for Global Change Studies, Beijing 100875, China;4. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China;1. School of Geography and Ocean Science, Nanjing University, Jiangsu Collaborative Innovation Center for Climate Change, Nanjing 210023, China;2. Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, MD 21218-2686, USA;3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | The Chinese Loess Plateau (CLP) contains an extensive record of aeolian deposition through multiple glacial–interglacial cycles. Independent chronologies based on pedostratigraphy, magnetic susceptibility, radiocarbon and luminescence dating were developed for 79 sites and used to estimate aeolian mass accumulation rates (MARs) for marine isotope stages 1–5. The regional median value of MAR for Stage 2 is 310 g/m2/yr compared to an estimate of 65 g/m2/yr for Stage 5. Estimated MARs from individual sites for Stage 2 are approximately 4.3 times greater than MARs for Stage 5 and 2.1 times greater than for Stage 1. MAR values at individual sites are consistently highest in the northwest and lowest in the southwest of the CLP during all marine isotope stages. MARs estimated on sections through loess terraces are consistently higher than MAR estimates at other sites, indicating that local recycling of loess material from exposed river valley deposits has been significant throughout the last 130 kyr. Although the spatial and temporal patterns in MAR are robust, there are uncertainties about the magnitude of these changes due to (a) lack of bulk density measurements and uncertainties in the chronologies for individual sites, (b) site and chronological biases in the sampling used to derive regional estimates, and (c) the unquantified nature of human impact on accumulation rates during the late Holocene. Nevertheless, the records from the CLP pose a number of challenges which could be addressed by numerical models of the palaeo-dust cycle. |
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