10:00 AM - 10:15 AM
[ACC33-05] Effects of Penultimate Glacial Maximum ice configuration and true polar wander on GIA-induced Last Interglacial sea level
★Invited Papers
Keywords:Glacial Isostatic Adjustment, Last Interglacial , Relative Sea Level Change, True Polar Wander
The behavior of polar ice sheets during past warm periods provides crucial constraints for understanding their potential response to future climate warming. The Last Interglacial (LIG, ~125 ka) serves as a particularly important analog due to its global mean temperatures being 1-2°C above pre-industrial levels and sea levels 6-9 m higher than present. This study presents an integrated analysis of relative sea level (RSL) observations and numerical modeling to reconstruct ice volume variations during this critical interval.
A fundamental challenge in reconstructing LIG ice volumes from RSL records is to deconvolve spatially heterogeneous solid Earth deformation signals associated with Glacial Isostatic Adjustment (GIA) from the RSL observations. To address this challenge, we developed and implemented a high-resolution numerical model that explicitly incorporates both GIA effects and true polar wander (TPW) during the LIG. Recently, the rapid development of an extensive database of well-dated RSL indicators from the LIG has enabled robust constraints on polar ice sheet volume fluctuations through comparison with model predictions.
Our approach employs a GIA model that incorporates TPW to evaluate spatiotemporal RSL variations during the LIG. Through sensitivity experiments, we demonstrate that ice sheet distributions during the Penultimate Glacial Maximum significantly influence global RSL model predictions through TPW. These findings advance our understanding of how the redistribution of ice masses and subsequent TPW affect sea-level changes, thereby contributing to improving future sea-level projections.
A fundamental challenge in reconstructing LIG ice volumes from RSL records is to deconvolve spatially heterogeneous solid Earth deformation signals associated with Glacial Isostatic Adjustment (GIA) from the RSL observations. To address this challenge, we developed and implemented a high-resolution numerical model that explicitly incorporates both GIA effects and true polar wander (TPW) during the LIG. Recently, the rapid development of an extensive database of well-dated RSL indicators from the LIG has enabled robust constraints on polar ice sheet volume fluctuations through comparison with model predictions.
Our approach employs a GIA model that incorporates TPW to evaluate spatiotemporal RSL variations during the LIG. Through sensitivity experiments, we demonstrate that ice sheet distributions during the Penultimate Glacial Maximum significantly influence global RSL model predictions through TPW. These findings advance our understanding of how the redistribution of ice masses and subsequent TPW affect sea-level changes, thereby contributing to improving future sea-level projections.