Middle to Late Quaternary changes in ice rafting and deep current transport on the Alpha Ridge, central Arctic Ocean and their responses to climatic cyclicities

Wang, Rujian; Polyak, Leonid; Wei, Xiao; Wu, Li; Li, Wenbao

doi:10.1016/j.gloplacha.2022.104019

Cited by 7 publications

(4 citation statements)

References 112 publications

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“…Thus, the good sorting of the relatively coarse EM2 cannot be interpreted as bottom current winnowing lags. Instead, previous studies have identified well-sorted IRD in other ocean areas (Prins et al, 2002;Wang et al, 2023). It is postulated that this IRD may originate from the transport of icebergs in regions with intense hydrodynamics, such as coastal sand beaches (Prins et al, 2002;Wang et al, 2023).…”

Section: Discussionmentioning

confidence: 94%

“…Instead, previous studies have identified well-sorted IRD in other ocean areas (Prins et al, 2002;Wang et al, 2023). It is postulated that this IRD may originate from the transport of icebergs in regions with intense hydrodynamics, such as coastal sand beaches (Prins et al, 2002;Wang et al, 2023). In such environments, the sediment itself is sorted well before being entrained in icebergs.…”

Section: Discussionmentioning

confidence: 95%

“…In view of this, we propose a new index, EM3/(EM3+EM4) (Figure 7B), to evaluate the relative change of local bottom current strength. This index utilizes indicators that reflect transport by relatively strong and weak bottom currents in EMMA end-members, which are unaffected by IRD (e.g., Prins et al, 2002;Jonkers et al, 2015;Wu et al, 2018;Wang et al, 2023).…”

Section: Bottom Currentsmentioning

confidence: 99%

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Grain-size, coarse fraction lithology and clay mineral compositions of surface sediments from Ross Sea, Antarctica: implications for their provenance and delivery mode

Wu,

Li,

Wang

et al. 2024

Front. Mar. Sci.

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Knowledge on spatial distribution, provenance and delivery mode of surface sediment aids in interpretation of nearby sediment records for paleoenvironmental reconstruction. Such knowledge, however, remains largely unknown for the modern Ross Sea, Antarctica: a key region for understanding the dynamical behavior of Antarctic Ice Sheet over geological past. In this study, we address this gap by analyzing the grain-size distribution, coarse fraction (>250 μm) lithology, and clay mineralogy of a set of surface sediment samples covering the whole Ross Sea continental shelf. Our data reveals that the sediments were mostly delivered by icebergs and bottom currents. Iceberg delivery was significantly controlled by factors such as water depth, proximity to the iceberg sources, and invasion of the Modified Circumpolar Deep Water. Bottom current activity was stronger in the Western Ross Sea (WRS) than in the Eastern Ross Sea (ERS), controlled by the formation and transport of Dense Shelf Water. Three major sorts of coarse fraction were identified, including the quartz-rich Iceberg Rafted Detritus (IRD) originating from West Antarctic glaciers and primarily distributed in the ERS, the mafic rocks-rich IRD from the Ferrar Group as well as the McMurdo Volcanic Group and mainly found in the WRS, and deformed silt traced back to the grounding zone of the David Glacier-Dragalski Ice Tongue system. The distribution of clay minerals is dominated by a distinct binary mixing pattern. Smectite and kaolinite are mainly present in the ERS, derived from beneath the West Antarctic Ice Sheet. Higher illite and chlorite contents were found offshore of the Southern Victoria Land, derived from the East Antarctic craton. Overall, these results demonstrate that the glaciers draining into Ross Sea from both the East and West Antarctic Ice Sheets are highly dynamical in the context of modern climate conditions, with implications for potential contribution to future sea level rise.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 95%

Section: Bottom Currentsmentioning

confidence: 99%

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Grain-size, coarse fraction lithology and clay mineral compositions of surface sediments from Ross Sea, Antarctica: implications for their provenance and delivery mode

Wu,

Li,

Wang

et al. 2024

Front. Mar. Sci.

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“…The Arctic, a region of ecological significance, is undergoing a profound transformation as a result of climate change-induced shifts in its ice dynamics. This transformation, marked by unprecedented reductions in sea ice extent, thickness, and multi-year ice, underscores the urgent and far-reaching consequences of global warming on this delicate polar environment [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Arctic Ice Changes and Global Warming

Sharapov

2023

E3S Web Conf.

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The Arctic, a region of ecological and climatic significance, is undergoing unprecedented ice changes due to climate change. This transformation, marked by rapid reductions in sea ice extent, thickness, and the persistence of multi-year ice, has far-reaching consequences for ecosystems, biodiversity, and global climate patterns. This article examines the historical perspective of the Arctic's ice dynamics, revealing a oncestable environment now in the throes of rapid change. The current state of Arctic ice is analyzed, emphasizing alarming reductions observed through satellite imagery and the implications for rising sea levels and disrupted ecosystems. Rooted in the causes of Arctic ice changes, primarily driven by the greenhouse gas effect, the article underscores the urgent need for global mitigation efforts. Scientific research and models provide critical insights, enhancing our understanding of the complex interactions driving these changes. Mitigation and adaptation strategies are discussed as essential components of a holistic approach, emphasizing the interconnectedness of the Arctic's fate with global efforts to address climate change. The exploration of Arctic ice changes serves as a call to action for international collaboration, sustainable practices, and a shared commitment to preserving the delicate balance of our planet's climate.

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Formation of the upper reaches of the Yellow River: Provenance evidence from the strata of the Yellow River sedimentary basin

Li,

Feng,

Wang

et al. 2023

Global and Planetary Change

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Middle to Late Quaternary changes in ice rafting and deep current transport on the Alpha Ridge, central Arctic Ocean and their responses to climatic cyclicities

Cited by 7 publications

References 112 publications

Grain-size, coarse fraction lithology and clay mineral compositions of surface sediments from Ross Sea, Antarctica: implications for their provenance and delivery mode

Grain-size, coarse fraction lithology and clay mineral compositions of surface sediments from Ross Sea, Antarctica: implications for their provenance and delivery mode

Arctic Ice Changes and Global Warming

Formation of the upper reaches of the Yellow River: Provenance evidence from the strata of the Yellow River sedimentary basin

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