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An ~130 kyr Record of Surface Water Temperature and δ 18 O From the Northern Bay of Bengal: Investigating the Linkage Between Heinrich Events and Weak Monsoon Intervals in Asia
Author(s) -
Lauterbach Stefan,
Andersen Nils,
Wang Yiming V.,
Blanz Thomas,
Larsen Thomas,
Schneider Ralph R.
Publication year - 2020
Publication title -
paleoceanography and paleoclimatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.927
H-Index - 127
eISSN - 2572-4525
pISSN - 2572-4517
DOI - 10.1029/2019pa003646
Subject(s) - teleconnection , monsoon , climatology , geology , sea surface temperature , east asian monsoon , foraminifera , glacial period , oceanography , northern hemisphere , bay , precipitation , monsoon of south asia , geography , paleontology , benthic zone , el niño southern oscillation , meteorology
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 δ 18 O sw‐ivc and U K' 37 ‐based SST from the northern Bay of Bengal, covering the last ~130 kyr. The δ 18 O sw‐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 U K' 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.