- Northeastern (NE) India experiences extraordinarily pronounced seasonal climate, governed by the Indian summer monsoon (ISM). The vulnerability of this region to floods and droughts calls for detailed and highly resolved paleoclimate reconstructions to assess the recurrence rate and driving factors of ISM changes. We use stable oxygen and carbon isotope ratios (delta O-18 and delta C-13) from stalagmite MAW-6 from Mawmluh Cave to infer climate and environmental conditions in NE India over the last deglaciation (16-6ka). We interpret stalagmite delta O-18 as reflecting ISM strength, whereas delta C-13 appears to be driven by local hydroclimate conditions. Pronounced shifts in ISM strength over the deglaciation are apparent from the delta O-18 record, similarly to other records from monsoonal Asia. The ISM is weaker during the late glacial (LG) period and the Younger Dryas, and stronger during the BOlling-Allerod and Holocene. Local conditions inferred from the delta C-13 record appear to have changed less substantially over time,Northeastern (NE) India experiences extraordinarily pronounced seasonal climate, governed by the Indian summer monsoon (ISM). The vulnerability of this region to floods and droughts calls for detailed and highly resolved paleoclimate reconstructions to assess the recurrence rate and driving factors of ISM changes. We use stable oxygen and carbon isotope ratios (delta O-18 and delta C-13) from stalagmite MAW-6 from Mawmluh Cave to infer climate and environmental conditions in NE India over the last deglaciation (16-6ka). We interpret stalagmite delta O-18 as reflecting ISM strength, whereas delta C-13 appears to be driven by local hydroclimate conditions. Pronounced shifts in ISM strength over the deglaciation are apparent from the delta O-18 record, similarly to other records from monsoonal Asia. The ISM is weaker during the late glacial (LG) period and the Younger Dryas, and stronger during the BOlling-Allerod and Holocene. Local conditions inferred from the delta C-13 record appear to have changed less substantially over time, possibly related to the masking effect of changing precipitation seasonality. Time series analysis of the delta O-18 record reveals more chaotic conditions during the late glacial and higher predictability during the Holocene, likely related to the strengthening of the seasonal recurrence of the ISM with the onset of the Holocene.…
MetadatenVerfasserangaben: | Franziska A. Lechleitner, Sebastian Franz Martin BreitenbachORCiDGND, Hai Cheng, Birgit PlessenORCiDGND, Kira RehfeldORCiDGND, Bedartha GoswamiORCiDGND, Norbert MarwanORCiDGND, Deniz Eroglu, Jess F. Adkins, Gerald Haug |
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DOI: | https://doi.org/10.1017/qua.2017.72 |
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ISSN: | 0033-5894 |
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ISSN: | 1096-0287 |
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Titel des übergeordneten Werks (Englisch): | Quaternary research : an interdisciplinary journal |
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Verlag: | Cambridge Univ. Press |
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Verlagsort: | New York |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Jahr der Erstveröffentlichung: | 2017 |
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Erscheinungsjahr: | 2017 |
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Datum der Freischaltung: | 20.04.2020 |
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Freies Schlagwort / Tag: | Indian Summer Monsoon; carbon isotopes; deglaciation; oxygen isotopes; stalagmite |
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Band: | 88 |
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Seitenanzahl: | 14 |
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Erste Seite: | 458 |
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Letzte Seite: | 471 |
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Fördernde Institution: | Swiss National Fond [CRSI22 132646/1, P2EZP2_172213]; German Science Foundation (DFG) [MA4759/8-1, RE3994-1/1]; National Natural Science Foundation of China (NSFC) [4123054, 2013CB955902]; U.S. National Innovation program under the Marie Sklodowska-Curie grant [691037] |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
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Peer Review: | Referiert |
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Name der Einrichtung zum Zeitpunkt der Publikation: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften |
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