North Atlantic forcing of millennial-scale Indo-Australian monsoon dynamics during the Last Glacial period

Denniston, Rhawn F.; Wyrwoll, Karl-Heinz; Asmerom, Yemane; Polyak, Victor J.; Humphreys, W. F.; Cugley, John; Woods, David R.; LaPointe, Zachary; Peota, Julian; Greaves, Elizabeth

doi:10.1016/j.quascirev.2013.04.012

Cited by 117 publications

(115 citation statements)

References 49 publications

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“…The lack of co-variance between the riverine and dust records prior to the YD probably relates to complex sedimenttransport mechanisms due to lower sea-level and differential wind patterns. A regime of intense droughts during the ACR in NW Australia is also supported by recently published speleothem d 18 O records from the Ball Gown Cave in NW Australia 10 (Fig. 3).…”

Section: Resultssupporting

confidence: 80%

Southern Hemisphere control on Australian monsoon variability during the late deglaciation and Holocene

et al. 2015

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The evolution of the Australian monsoon in relation to high-latitude temperature fluctuations over the last termination remains highly enigmatic. Here we integrate high-resolution riverine runoff and dust proxy data from X-ray fluorescence scanner measurements in four well-dated sediment cores, forming a NE-SW transect across the Timor Sea. Our records reveal that the development of the Australian monsoon closely followed the deglacial warming history of Antarctica. A minimum in riverine runoff documents dry conditions throughout the region during the Antarctic Cold Reversal (15-12.9 ka). Massive intensification of the monsoon coincided with Southern Hemisphere warming and intensified greenhouse forcing over Australia during the atmospheric CO 2 rise at 12.9-10 ka. We relate the earlier onset of the monsoon in the Timor Strait (13.4 ka) to regional changes in landmass exposure during deglacial sea-level rise. A return to dryer conditions occurred between 8.1 and 7.3 ka following the early Holocene runoff maximum.

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Section: Resultssupporting

confidence: 80%

Southern Hemisphere control on Australian monsoon variability during the late deglaciation and Holocene

et al. 2015

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“…Marine records of riverine input to the Flores Sea 23 and offshore of southern Papua New Guinea 22 indicate increased runoff during Northern Hemisphere cold intervals such as HS1. Terrestrial evidence for increased rainfall during HS1 is also found in lake records and a speleothem record for northern Australia 20,24 . However, deep-sea sediment faunal records reflecting monsooncontrolled austral winter upwelling off the southern coast of Java 21 suggest drier conditions during HS1.…”

mentioning

confidence: 73%

“…S10). 19,20,24 , indicate that steepening of the north-south interhemispheric thermal gradient during HS1 produced a strong southward shift of the Australasian monsoon. The interhemispheric seesaw pattern of Australasian monsoon climate on millennial-scales lends support to the possibility that a protracted southward displacement of the global monsoon system during an intensely cold HS1 may have been an integral part of the sequence of events driving the last deglaciation 5 .…”

Section: Resultsmentioning

confidence: 99%

“…However, marine and terrestrial records of the climatic footprint of HS1 in the Southern Hemisphere sector of the Australasian monsoon are still sparse, and not entirely consistent [19][20][21][22][23][24] . Marine records of riverine input to the Flores Sea 23 and offshore of southern Papua New Guinea 22 indicate increased runoff during Northern Hemisphere cold intervals such as HS1.…”

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confidence: 99%

“…Likewise, stalagmites from Borneo have documented northern equatorial climate change from 570 to 210 kyr BP 25 and over the last 100 kyr 14,15 . Stalagmite d 18 O records of the Australian-Indonesian summer monsoon (AISM), however, are still discontinuous and limited to the last 40 kyr 24,26,27 .…”

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confidence: 99%

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Rapid interhemispheric climate links via the Australasian monsoon during the last deglaciation

et al. 2013

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International audienceRecent studies have proposed that millennial-scale reorganization of the ocean-atmosphere circulation drives increased upwelling in the Southern Ocean, leading to rising atmospheric carbon dioxide levels and ice age terminations. Southward migration of the global monsoon is thought to link the hemispheres during deglaciation, but vital evidence from the southern sector of the vast Australasian monsoon system is yet to emerge. Here we present a 230thorium-dated stalagmite oxygen isotope record of millennial-scale changes in Australian- Indonesian monsoon rainfall over the last 31,000 years. The record shows that abrupt southward shifts of the Australian-Indonesian monsoon were synchronous with North Atlantic cold intervals 17,600-11,500 years ago. The most prominent southward shift occurred in lock-step with Heinrich Stadial 1 (17,600-14,600 years ago), and rising atmospheric carbon dioxide. Our findings show that millennial-scale climate change was transmitted rapidly across Australasia and lend support to the idea that the 3,000-year-long Heinrich 1 interval could have been critical in driving the last deglaciation. DOI: 10.1038/ncomms3908

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Precipitation variability within the West Pacific Warm Pool over the past 120 ka: Evidence from the Davao Gulf, southern Philippines

et al. 2014

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Proxy records of hydrologic variability in the West Pacific Warm Pool (WPWP) have revealed wide-scale changes in past convective activity in response to orbital and suborbital climate forcings. However, attributing proxy responses to regional changes in WPWP hydrology versus local variations in precipitation requires independent records linking the terrestrial and marine realms. We present high-resolution stable isotope, U K′ 37 sea surface temperature, X-ray fluorescence (XRF) core scanning, and coccolithophore-derived paleoproductivity records covering the past 120 ka from International Marine Global Change (IMAGES) Program Core MD06-3075 (6°29′N, 125°50′E, water depth 1878 m), situated in the Davao Gulf on the southern side of Mindanao. XRF-derived log(Fe/Ca) records provide a robust proxy for runoff-driven sedimentary discharge from Mindanao, while past changes in local productivity are associated with variable freshwater runoff and stratification of the surface layer. Significant precessional-scale variability in sedimentary discharge occurred during marine isotope stage (MIS) 5, with peaks in discharge contemporaneous with Northern Hemisphere summer insolation minima. We attribute these changes to the latitudinal migration of the Intertropical Convergence Zone (ITCZ) over the WPWP together with variability in the strength of the Walker circulation acting on precessional timescales. Between 60 and 15 ka sedimentary discharge at Mindanao was muted, displaying little orbital-or millennial-scale variability, likely in response to weakened precessional insolation forcing and lower sea level driving increased subsidence of air masses over the exposed Sunda Shelf. These results highlight the high degree of local variability in the precipitation response to past climate changes in the WPWP.

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North Atlantic forcing of millennial-scale Indo-Australian monsoon dynamics during the Last Glacial period

Cited by 117 publications

References 49 publications

Southern Hemisphere control on Australian monsoon variability during the late deglaciation and Holocene

Southern Hemisphere control on Australian monsoon variability during the late deglaciation and Holocene

Rapid interhemispheric climate links via the Australasian monsoon during the last deglaciation

Precipitation variability within the West Pacific Warm Pool over the past 120 ka: Evidence from the Davao Gulf, southern Philippines

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