Glacial to Holocene changes in sea surface temperature and seawater δ18O in the northern Indian Ocean

Raza, Tabish; Ahmad, Shoeb; Steinke, Stephan; Raza, Waseem; Lone, Mahjoor Ahmad; Beja, Santosh Kumar; Suseela, Gorti

doi:10.1016/j.palaeo.2017.07.026

Cited by 25 publications

(24 citation statements)

References 62 publications

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“…Such early initiation of the deglacial warming has been reported in the nearby Bay of Bengal (supplementary data Fig. F2 ), Arabian Sea and eastern Indian Ocean 41 , 43 . The isotopes, in contrast, remain steadily low until the YD at ~12 ka, lagging the insolation and consequent deglacial warming by ~6 ka (Fig.…”

Section: Resultssupporting

confidence: 74%

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Huguet

Routh

Fietz

et al. 2018

Sci Rep

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High-resolution paleoclimate data on stable isotopes in a stalagmite were coupled to glycerol dialkyl glycerol tetraethers (GDGTs). The Indian Summer Monsoon (ISM) transitioned from limited rainfall during the Last Glacial Maximum (LGM) to intense precipitation during early Holocene (22 to 6 ka). This was associated with changes in stalagmite growth, abundance of branched (br) and isoprenoid (iso) GDGTs, as well as δ18O, δ13C, Sr/Ca and GDGT-derived signals providing both temperature and moisture information. The reconstructed mean annual air temperature (MAAT) of the most modern stalagmite sample at ~19 °C, matches the surface and cave MAAT, but was ~4 °C lower during LGM. Warming at the end of LGM occurred before ISM strengthened and indicate 6 ka lag consistent with sea surface temperature records. The isotope records during the Younger Dryas show rapid progressions to dry conditions and weak monsoons, but these shifts are not coupled to TEX86. Moreover, change to wetter and stronger ISM, along with warmer Holocene conditions are not continuous indicating a decoupling of local temperatures from ISM.

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Section: Resultssupporting

confidence: 74%

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Huguet

Routh

Fietz

et al. 2018

Sci Rep

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“…In support of our SST reconstruction, we find a generally good agreement of the Core 17286‐1 U K' 37 ‐based SST record with foraminifera Mg/Ca‐based SST reconstructions from the northern BoB and the adjacent Andaman Sea throughout the last ~30 kyr (Figure ). These records indicate spatially largely consistent average SSTs, which varied between ~25.0 and ~27.0 °C during the LGM (20–26 ka BP) and between ~27.0 and ~29.0 °C during the Holocene (0–10 ka BP), consistently indicating an ocean surface warming of ~1.0–2.0 °C across Termination I (Gebregiorgis et al, ; Govil & Naidu, ; Rashid et al, ; Rashid et al, ; Raza et al, ). This is comparable to the U K' 37 ‐derived SST values recorded in Core 17286‐1 (Figure ).…”

Section: Discussionmentioning

confidence: 83%

“…(e) Mg/Ca‐based SST record of Core SK168/GC‐1, Andaman Sea (Gebregiorgis et al, ). (f) Mg/Ca‐based SST record of Core SK157‐14, southern BoB (Raza et al, ). For the location of the individual proxy records see Figure b.…”

Section: Discussionmentioning

confidence: 99%

“…However, other proxy records from the Arabian Sea as well as from the Bay of Bengal (BoB) indicate no particular cooling but a warming of the Indian Ocean surface waters at the time of the Younger Dryas and Heinrich events H1 and H2 (Anand et al, ; Panmei et al, ; Saher et al, ; Saraswat et al, ), thus questioning the general validity of the proposed linkage between ISM weakening and Indian Ocean surface water cooling. So far, most of the available paleoceanographic proxy records from the core zone of the ISM, that is, the BoB and the adjacent Andaman Sea (e.g., Ahmad et al, ; Contreras‐Rosales et al, ; Gebregiorgis et al, ; Govil & Naidu, ; Kudrass et al, ; Marzin et al, ; Rashid et al, ; Rashid et al, ; Raza et al, ; Sijinkumar et al, ) cover only the Holocene and latest Pleistocene (<50 kyr) and/or have a relatively low temporal resolution. This largely limits the proper reconstruction of short‐term ISM variability in this region under climatic boundary conditions different than today, particularly during the last glacial and last interglacial periods.…”

Section: Introductionmentioning

confidence: 99%

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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

Andersen

Wang

et al. 2020

Paleoceanog and Paleoclimatol

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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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“…Mg/Ca from the southern Bay of Bengal(Raza et al, 2017) indicate <1 °C cooling during the middle Holocene. Records from the Andaman Sea in the northeastern Indian Ocean show contrasting results, 405…”

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confidence: 99%

The remote response of the South Asian Monsoon to reduced dust emissions and Sahara greening during the middle Holocene

Pausata¹,

Messori²,

Yun³

et al. 2020

Preprint

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Abstract. Previous studies based on multiple paleoclimate archives suggested a prominent intensification of the South Asian Monsoon (SAM) during the mid-Holocene (MH, ~ 6000 years before present day). The main forcing that contributed to this intensification is related to changes in the Earth’s orbital parameters. However, other key factors likely played important roles, including remote changes in vegetation cover and airborne dust emission. In particular, northern Africa also experienced much wetter conditions and a more mesic landscape than today during the MH (the so-called African Humid Period), leading to a large decrease in airborne dust globally. However, most modelling studies investigating the SAM changes during the Holocene overlooked the potential impacts of the vegetation and dust emission changes that took place over northern Africa. Here, we use a set of simulations for the MH climate, in which vegetation over the Sahara and reduced dust concentrations are considered. Our results show that SAM rainfall is strongly affected by Saharan vegetation and dust concentrations, with a large increase in particular over northwestern India and a lengthening of the monsoon season. We propose that this remote influence is mediated by anomalies in Indian Ocean sea-surface temperatures and may have shaped the evolution of the SAM during the termination of the African Humid Period.

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Glacial to Holocene changes in sea surface temperature and seawater δ18O in the northern Indian Ocean

Cited by 25 publications

References 62 publications

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

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

The remote response of the South Asian Monsoon to reduced dust emissions and Sahara greening during the middle Holocene

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Glacial to Holocene changes in sea surface temperature and seawater δ18O in the northern Indian Ocean

Cited by 25 publications

References 62 publications

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

Temperature and Monsoon Tango in a Tropical Stalagmite: Last Glacial-Interglacial Climate Dynamics

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

The remote response of the South Asian Monsoon to reduced dust emissions and Sahara greening during the middle Holocene

Contact Info

Product

Resources

About

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