Glacial Isostatic Adjustment modelling of the mid-Holocene sea-level highstand of Singapore and Southeast Asia

Li, Tanghua; Chua, Stephen; Tan, Fangyi; Khan, Nicole S.; Shaw, Timothy A.; Majewski, Jedrzej; Meltzner, Aron J.; Switzer, Adam D.; Wu, Patrick; Horton, Benjamin P.

doi:10.1016/j.quascirev.2023.108332

Cited by 5 publications

(7 citation statements)

References 102 publications

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“…Interestingly, delays in deglaciation histories did not improve model fit in the Late Holocene, as was suggested by published studies in the region for the early to mid Holocene 7 , 10 , 31 . Although delaying the ice melting reduces the magnitude of the mid-Holocene highstand 11 , it slightly enlarges the misfit with the Late Holocene SLIPs in this study (Fig. 6 c).…”

Section: Discussionmentioning

confidence: 60%

“…In ( b ), the lower uncertainties at times corresponding to data gaps are an artifact of the model. ( c ) RSL data from Siloso Point compared to an ensemble of GIA model predictions 11 . The GIA model ensemble encompasses a variety of upper mantle (UM) and lower mantle (LM) viscosities, as well as ice-melting histories (global 1 kyr delay; 1 kyr delay in ice melting from Antarctica), modified with reference to the ICE-6G_C (VM5a) model 76 .…”

Section: Resultsmentioning

confidence: 99%

“…6 ). A Late Holocene RSL fall from a highstand in equatorial locations such as Singapore is commonplace due to continental levering and ocean syphoning 11 , 54 , 55 . Analyses of the coral microatoll surface morphologies reveal higher-frequency RSL fluctuations in the Late Holocene in Singapore (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…During the early Holocene, there was a slowdown in the rate of RSL rise between ~ 8.5 kyr BP and 7 kyr BP, associated with the final stages of melting of major ice sheets 10 , 12 . This RSL rise was followed by mid-Holocene highstands of variable timing and magnitude within the region, before a Late Holocene RSL fall 11 . Some studies suggest the presence of a Late Holocene RSL lowstand between 1 and 3.4 m below present at ~ 1 kyr BP 6 , 7 , 12 , 13 .…”

Section: Study Areamentioning

confidence: 99%

“…Despite notable attempts to study Late Holocene RSL changes in the Sunda Shelf 6 – 8 , data inconsistencies and large uncertainties in the data make deciphering the drivers of RSL change in the region challenging 9 . The range of RSL elevations from proxy data in the Malay-Thai Peninsula at any time over the past ~ 3000 years is 3–4 m 10 , while the variability in RSL predicted by GIA models over this time period can reach up to ~ 3 m 11 within the region, presenting challenges for tuning GIA models. Furthermore, some data from the Sunda Shelf suggest RSL of up to 3.4 m below present between ~ 3 and ~ 0.5 thousand years before present (kyr BP) 7 , 12 , 13 while others do not 8 , 14 .…”

Section: Introductionmentioning

confidence: 99%

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Late Holocene relative sea-level records from coral microatolls in Singapore

Tan,

Horton,

et al. 2024

Sci Rep

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Late Holocene relative sea-level (RSL) data are important to understand the drivers of RSL change, but there is a lack of precise RSL records from the Sunda Shelf. Here, we produced a Late Holocene RSL reconstruction from coral microatolls in Singapore, demonstrating for the first time the utility of Diploastrea heliopora microatolls as sea-level indicators. We produced 12 sea-level index points and three marine limiting data with a precision of < ± 0.2 m (2σ) and < ± 26 years uncertainties (95% highest density region). The data show a RSL fall of 0.31 ± 0.18 m between 2.8 and 0.6 thousand years before present (kyr BP), at rates between − 0.1 ± 0.3 and − 0.2 ± 0.7 mm/year. Surface profiles of the fossil coral microatolls suggest fluctuations in the rate of RSL fall: (1) stable between 2.8 and 2.5 kyr BP; (2) rising at ~ 1.8 kyr BP; and (3) stable from 0.8 to 0.6 kyr BP. The microatoll record shows general agreement with published, high-quality RSL data within the Sunda Shelf. Comparison to a suite of glacial isostatic adjustment (GIA) models indicate preference for lower viscosities in the mantle. However, more high quality and precise Late Holocene RSL data are needed to further evaluate the drivers of RSL change in the region and better constrain GIA model parameters.

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