Monitoring Australian Monsoon variability over the past four glacial cycles

Pei, Renjie; Kuhnt, Wolfgang; Holbourn, Ann; Hingst, Johanna; Köppe, M.; Schultz, J. H.; Kopetz, Peer; Zhang, Peng; Andersen, Nils

doi:10.1016/j.palaeo.2021.110280

Cited by 18 publications

(21 citation statements)

References 87 publications

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“…The sediment succession from Core SO257‐18548 and nearby Site U1482 were combined, based on the correlation of the high‐resolution X‐ray fluorescence (XRF) scanner elemental records. The tie point between these records, corresponding to an age of ∼324 ka, is located at 10.84 m in Core SO257‐18548 and at 24.97 mcd in Site U1482 (Pei et al., 2021). All samples were oven dried at 40°C and weighed prior to washing over a 63 μm sieve.…”

Section: Methodsmentioning

confidence: 99%

“…Details of the 14C and oxygen isotope stratigraphy of Cores SO257‐18548, SO257‐18571, and Site U1482 between 24.76 and 30.22 mcd are provided in Pei et al. (2021). We additionally tested the robustness of the age models for the last 25 kyr by correlating our Log(K/Ca) records derived from XRF‐scanning to the higher resolution Log(K/Ca) record from Core MD01‐2378, which is based on a robust radiometric age model of more than one hundred 14C AMS dates (Kuhnt et al., 2015).…”

Section: Methodsmentioning

confidence: 99%

“…We applied an ice volume correction of 60% of the original benthic foraminiferal δ 18 O variability in Core SO257‐18548, Site U1482, and Core SO257‐18571 (Pei et al., 2021; Figure S3 in Supporting Information ). Since the gradient of the original benthic foraminiferal δ 18 O between modern and the LGM (1.6‰) exceeds the global mean value of ∼1.1‰ (Waelbroeck et al., 2002), we assume that the contribution of deep water temperature accounts for the difference.…”

Section: Methodsmentioning

confidence: 99%

“…The age model prior to 21 ka was generated by correlating the benthic foraminiferal δ 18 O to the benthic isotope stack LR04 (Lisiecki & Raymo, 2005). Details of the 14C and oxygen isotope stratigraphy of Cores SO257-18548, SO257-18571, and Site U1482 between 24.76 and 30.22 mcd are provided in Pei et al (2021).…”

Section: Chronologymentioning

confidence: 99%

“…We applied an ice volume correction of 60% of the original benthic foraminiferal δ 18 O variability in Core SO257-18548, Site U1482, and Core SO257-18571 (Pei et al, 2021;Figure S3 in Supporting Information S1).…”

Section:     mentioning

confidence: 99%

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Evolution of Sea Surface Hydrology Along the Western Australian Margin Over the Past 450 kyr

Pei

Kuhnt

Holbourn

et al. 2021

Paleoceanog and Paleoclimatol

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We collected a suite of core top samples during R/V Sonne Cruise SO257 in May 2017 along the southwestern front of the Indo‐Pacific Warm Pool (IPWP) to monitor the variability of Southern Hemisphere tropical and subtropical sea surface hydrology and to assess temperature and salinity reconstructions with data sets reflecting conditions in the post‐monsoonal season. In our core top samples, a steep increase in planktic δ18O, associated with a decrease in sea surface temperature (SST), indicates that the southwestern front of the IPWP is located between 23° and 24°S during austral fall. We additionally reconstructed SST, sea surface salinity ,and δ18O seawater (δ18Osw) over the last 450 kyr in two sediment successions located within and beyond the monsoonal rain belt. Our records show that SST was highly coherent and phase‐locked with atmospheric pCO2 during the last 450 kyr. The regional differences in the δ18Osw records reveal that the Western Australian Margin north of 15°S remained seasonally under the influence of IPWP water masses, even during glacials. The temporal variability in upper ocean hydrology along the Western Australian Margin is not directly coupled to local monsoonal precipitation, but is strongly affected by advective mixing of Indonesian Throughflow derived water masses.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%