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  An ~130 kyr record of surface water temperature and δ18O from the Northern Bay of Bengal: investigating the linkage between Heinrich Events and weak monsoon intervals in Asia

Lauterbach, S., Andersen, N., Wang, Y., Blanz, T., Larsen, T., & Schneider, R. R. (2020). An ~130 kyr record of surface water temperature and δ18O from the Northern Bay of Bengal: investigating the linkage between Heinrich Events and weak monsoon intervals in Asia. Paleoceanography and paleoclimatology, 35(2): e2019PA003646, pp. 1-17. doi:10.1029/2019PA003646.

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 Creators:
Lauterbach, Stefan, Author
Andersen, Nils, Author
Wang, Yiming1, Author              
Blanz, Thomas, Author
Larsen, Thomas1, Author              
Schneider, Ralph R., Author
Affiliations:
1Archaeology, Max Planck Institute for the Science of Human History, Max Planck Society, ou_2074312              

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Free keywords: Indian Summer Monsoon, Weak Monsoon Intervals, marine sediments, Bay of Bengal, foraminifera oxygen isotopes, UK'37 sea surface temperature
 Abstract: Abstract Millennial-scale reductions in monsoon precipitation, so-called Weak Monsoon Intervals (WMIs), have been identified in numerous paleoclimate records across the Afro-Asian monsoon domain throughout the last glacial-interglacial cycle. These are considered the regional response to cooling during Heinrich events in the North Atlantic realm and several mechanisms have been suggested to explain this hemisphere-scale climatic teleconnection. In particular, reductions in Indian Ocean sea surface temperature (SST) have been proposed as the linking element between Heinrich events and WMIs. However, the validity of this relationship has only been demonstrated for the last ~20 kyr, leaving unresolved whether it also holds on longer time scales. Here we present a new paired record of planktonic foraminifera-based δ18Osw-ivc and UK'37-based SST from the northern Bay of Bengal, covering the last ~130 kyr. The δ18Osw-ivc record clearly reflects orbitally paced changes of Indian Summer Monsoon intensity superimposed by centennial- to millennial-scale WMIs that occurred synchronously to North Atlantic Heinrich events. Comparison with the UK'37-based SST reconstruction reveals, however, that WMIs in most cases were not paralleled by ocean surface cooling, questioning whether Indian Ocean SST lowering was the linking element between Heinrich events and reductions in monsoon precipitation in Asia also during the last glacial period.

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Language(s): eng - English
 Dates: 2020-01-312020-02
 Publication Status: Published in print
 Pages: 17
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2019PA003646
Other: shh2518
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Title: Paleoceanography and paleoclimatology
Source Genre: Journal
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Publ. Info: Hoboken, NJ : Wiley
Pages: - Volume / Issue: 35 (2) Sequence Number: e2019PA003646 Start / End Page: 1 - 17 Identifier: ISSN: 1944-9186
CoNE: https://pure.mpg.de/cone/journals/resource/1944-9186