nerc.ac.uk

Climatic and in-cave influences on δ18O and δ13C in a stalagmite from northeastern India through the last deglaciation

Lechleitner, Franziska A.; Breitenbach, Sebastian F.M.; Cheng, Hai; Plessen, Birgit; Rehfeld, Kira; Goswami, Bedartha; Marwan, Norbert; Eroglu, Deniz; Adkins, Jess; Haug, Gerald. 2017 Climatic and in-cave influences on δ18O and δ13C in a stalagmite from northeastern India through the last deglaciation. Quaternary Research, 88 (03). 458-471. https://doi.org/10.1017/qua.2017.72

Before downloading, please read NORA policies.
[img] Text
Lechleitner.pdf - Published Version
Restricted to NORA staff only

Download (1MB) | Request a copy
[img]
Preview
Text
Copyright University of Washington
Lechleitner - Climatic and in-cave influences AAM.pdf - Accepted Version

Download (282kB) | Preview

Abstract/Summary

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 (δ18O and δ13C) 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 δ18O as reflecting ISM strength, whereas δ13C appears to be driven by local hydroclimate conditions. Pronounced shifts in ISM strength over the deglaciation are apparent from the δ18O 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 Bølling-Allerød and Holocene. Local conditions inferred from the δ13C record appear to have changed less substantially over time, possibly related to the masking effect of changing precipitation seasonality. Time series analysis of the δ18O 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.

Item Type: Publication - Article
Digital Object Identifier (DOI): https://doi.org/10.1017/qua.2017.72
ISSN: 0033-5894
Date made live: 23 Nov 2017 15:02 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/518493

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...