Sea-level fingerprinting technique: A window into meltwater pulse 1 A and constraints from Antarctica

被引:0
作者
Baba, Waseem Ahmad [1 ]
Pattanaik, Jitendra Kumar [1 ]
机构
[1] Cent Univ Punjab, Dept Geol, Bathinda 151401, India
关键词
Sea level fingerprinting; Meltwater Pulse; Antarctica; Sea level; LGM; GROUNDING-LINE RETREAT; LAST GLACIAL MAXIMUM; ICE-SHEET COLLAPSE; EAST ANTARCTICA; PINE ISLAND; ROSS SEA; PROBABILISTIC ASSESSMENT; OUTLET GLACIERS; MASS-BALANCE; CLIMATE;
D O I
10.1016/j.gloplacha.2025.104793
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
A global event known as Meltwater Pulse 1 A (MWP-1 A) during the last deglaciation contributed to sea level rise by 10 % in just over 0.3 ka. Different methods are being adopted to understand the source of meltwater pulses. This article provides a review of the sea-level fingerprinting technique and its application in understanding meltwater pulses with a specific focus on MWP-1 A. Sea level fingerprinting involves comparing melting scenarios to sea-level records to identify the sources of meltwater. The analysis reveals that a significant contribution from Antarctica results in larger sea-level spikes at multiple locations, while a single North American source would lead to larger spikes at specific locations. The technique takes into account factors such as glaciogeological evidence, ice-sheet changes, and Earth's visco-elastic rebound. However, the lack of precise field data limits the ability to fully constrain the source of meltwater pulses. Evidences from Antarctica suggest that while the ice sheet played a critical role in MWP-1 A, its precise contribution remains uncertain due to the complexity of ice dynamics. Deep sea sediment records, glacio-geological data and ice-core investigations indicate episodic ice-sheet collapse, particularly in marine-based sectors such as the Weddell Sea. Recent advancements in numerical modelling and geophysical reconstructions have improved our understanding of Antarctic contributions; however, significant uncertainties remain. This review highlights the need for further integration of highresolution sediment core data, improved ice-sheet modelling, and expanded geographic coverage of fingerprinting sites to refine the estimates of MWP-1 A contributions. The insights gained from understanding past rapid sea-level rise events are crucial for predicting future sea-level changes in response to ongoing global warming and ice-sheet instability. Furthermore, these findings have significant implications for policy-making, as understanding ice-sheet dynamics and their impact on global sea levels is essential for developing effective climate adaptation and mitigation strategies.
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页数:12
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