Trans-pacific glacial response to the Antarctic Cold Reversal in the southern mid-latitudes

Sagredo, Esteban A.; Kaplan, Michael R.; Araya, Paola; Lowell, Thomas V.; Aravena, Juan Carlos; Moreno, Patricio I.; Kelly, M. A.; Schaefer, Joerg M.

doi:10.1016/j.quascirev.2018.01.011

Cited by 54 publications

(107 citation statements)

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“…Total drainage of the united Cochrane and General Carrera paleolake occurred by 12.8 ka as a catastrophic lake discharge after the separation of the Northern and Southern Patagonian Ice Fields (Turner et al, 2005). This date marks a key moment in the deglaciation, when Patagonian ice resumed the retreat interrupted by the ACR stabilization or readvance recorded elsewhere (e.g., Strelin et al, 2011; García et al, 2012; Sagredo et al, 2018). After 12.8 ka, the Northern Patagonian Ice Field outlet glaciers continued with a stepwise retreat until the very end of the last glacial-interglacial transition (Glasser et al, 2012).…”

Section: Discussionmentioning

confidence: 94%

“…Cold and wet conditions have been recorded at the Archiépelago de los Chonos and Península Taitao (46°S) during the ACR and linked to Patagonian glacier advances (Bennett et al, 2000; Siani et al, 2010; Montade et al, 2013). In fact, a recent study has directly dated moraines to the ACR at the nearby Mount San Lorenzo (47°S) (Sagredo et al, 2018). The age of 14.0±0.2 cal ka BP for the charcoal embedded in glaciolacustrine sediments at Campo Grande site (300 m asl) together with the basal age of 12.8±0.1 cal ka BP for drainage of the glacial paleolake below 700 m at Mallín El Toqui indirectly bracket the timing of a glacial lake phase during the ACR.…”

Section: Discussionmentioning

confidence: 99%

“…To date, we lack a complete understanding of the PIS retreat and landscape transformation during the last deglaciation, including the timing and rate of ice demise, deglacial paleolake formation and collapse, and continental scale drainage diversion. Whereas some works suggest large and abrupt ice retreat starting at ca.18 ka and reaching the Andes core as early as 16.5 ka, with no evidence for extensive late-glacial readvances (Mercer, 1976; Denton et al, 1999; Hall et al, 2013, 2017; Moreno et al, 2015), others suggest a stepped ice retreat including late-glacial readvances until the very end of the last glacial-interglacial transition (McCulloch et al, 2005; Sugden et al, 2005; Strelin et al, 2011; García et al, 2012; Glasser et al, 2012; Sagredo et al, 2018). The onset of the PIS deglaciation is also debated: some Patagonian glaciers seem to have retreated from their maximum stands significantly earlier than others, which has implications for our understanding of the mechanisms of climate change during the last termination (Denton et al, 1999, 2010; Sugden et al, 2005; Douglass et al, 2006; Hein et al, 2010; de Porras et al, 2012; Moreno et al, 2015; Henríquez et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Early deglaciation and paleolake history of Río Cisnes Glacier, Patagonian Ice Sheet (44°S)

et al. 2018

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The timing, structure, and landscape change during the Patagonian Ice Sheet deglaciation remains unresolved. In this article, we provide a geomorphic, stratigraphic, and geochronological deglacial record of Río Cisnes Glacier at 44°S and also from the nearby Río Ñirehuao and Río El Toqui valleys (45°S) in Chilean Patagonia. Our 14C, 10Be, and optically stimulated luminescence data indicate that after the last glacial maximum, Río Cisnes Glacier experienced ~100 km deglaciation between >19.0 and 12.3 ka, accompanied by the formation of large glacial paleolakes. Deglaciation was interrupted by several ice readvances, and by 16.9±0.3 ka, Río Cisnes Glacier extended only ~40% of its full glacial extent. The deglaciation of Río Cisnes Glacier and other sensitive Patagonian glaciers occurred at least 1 ka earlier than the ca. 17.8 ka normally assumed for the local termination, coincident with West Antarctic isotope records. This early deglaciation can be linked to an orbital forcing–driven decline of Southern Ocean sea ice associated with a distinct atmospheric warming that is apparent for West Antarctica through Patagonia.

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Section: Discussionmentioning

confidence: 94%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Early deglaciation and paleolake history of Río Cisnes Glacier, Patagonian Ice Sheet (44°S)

et al. 2018

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“…The Southern Hemisphere glacial record is compatible with these climate trends. Highly resolved mountain glacier chronologies reveal that glacial culminations occurred just prior to the YD followed by net glacier recession through the YD (Kaplan et al, 2010(Kaplan et al, , 2011Putnam et al, 2010;García et al, 2012;Sagredo et al, 2018). It has recently been hypothesized that even in the North Atlantic region, glacier behavior may follow trends expressed in globally integrated temperature records, rather than temperature change trends influenced by Atlantic meridional overturning circulation (AMOC; i.e., Greenland ice cores; Bromley et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Early Younger Dryas glacier culmination in southern Alaska: Implications for North Atlantic climate change during the last deglaciation

Young

Briner

Schaefer

et al. 2019

Geology

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The transition from the glacial period to the Holocene was characterized by a dramatic reorganization of Earth's climate system linked to abrupt changes in atmospheric and oceanic circulation. In particular, considerable effort has been placed on constraining the magnitude, timing, and spatial variability of climatic changes during the Younger Dryas stadial (YD; 12.9-11.7 ka) within the North Atlantic region. Whereas the YD is clearly expressed in some climate archives, the record of mountain glacier change through the YD remains enigmatic and has elicited debate concerning the overall magnitude and seasonality associated with YD temperature change. Here, we report 19 new 10 Be ages from a location in the Pacific sector-the Ahklun Mountains, southern Alaska-that constrain the age of a lateglacial terminal moraine to 12.52 ± 0.24 ka, in the middle of the YD stadial. Our new 10 Be ages, combined with additional Northern Hemisphere records of glacier change, reveal that glacier culminations occurred in the early and/or middle YD, followed by glacier recession through the remainder of the YD. Widespread early-to-middle Younger Dryas glacier culminations imply modest summer cooling (i.e., seasonality) that briefly punctuated an overall warming trend through the YD stadial. This pattern of glacier culminations occurring in the early-to-middle YD followed by retreat through the remainder of the YD largely mimics the pattern of YD temperature change displayed in Greenland ice cores.

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“…This event influenced most of the Southern Hemisphere glaciers and even those in the tropical Andes (Jomelli et al 2014). Some of the still glaciated sub-Antarctic areas seem to have experienced more or less synchronous glacial advances in association with the ACR period (see for instance Putnam et al 2010, Pedro et al 2015, Darvill et al 2016, Graham et al 2017, Sagredo et al 2018. In addition, multi-proxy analysis of peat sequences on the eastern part of the archipelago indicate increased moisture and wind during the ACR (van der Putten et al 2015), which supports the hypothesis of cold and wet conditions over Kerguelen, owing to a potential shift of the westerlies belt (Jomelli et al 2017).…”

Section: Climate Sensitivitymentioning

confidence: 99%

A debris-covered glacier at Kerguelen (49°S, 69°E) over the past 15 000 years

et al. 2020

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Debris-covered glaciers constitute a large part of the world's cryosphere. However, little is known about their long-term response to multi-millennial climate variability, in particular in the Southern Hemisphere. Here, we provide first insights into the response of a debris-covered glacier to multi-millennial climate variability in the sub-Antarctic Kerguelen Archipelago, which can be compared to that of recently investigated debris-free glaciers. We focus on the Gentil Glacier and present 13 new 36Cl cosmic-ray exposure ages from moraine boulders. The Gentil Glacier experienced at least two glacial advances: the first one during the Late Glacial (19.0–11.6 ka) at ~14.3 ka and the second one during the Late Holocene at ~2.6 ka. Both debris-covered and debris-free glaciers advanced broadly synchronously during the Late Glacial, most probably during the Antarctic Cold Reversal event (14.5–12.9 ka). This suggests that both glacier types at Kerguelen were sensitive to abrupt temperature changes recorded in Antarctic ice cores, associated with increased moisture. However, during the Late Holocene, the advance at ~2.6 ka was not observed in other glaciers and seems to be an original feature of the debris-covered Gentil Glacier, related to either distinct dynamics or to distinct sensitivity to precipitation changes.

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Trans-pacific glacial response to the Antarctic Cold Reversal in the southern mid-latitudes

Cited by 54 publications

References 50 publications

Early deglaciation and paleolake history of Río Cisnes Glacier, Patagonian Ice Sheet (44°S)

Early deglaciation and paleolake history of Río Cisnes Glacier, Patagonian Ice Sheet (44°S)

Early Younger Dryas glacier culmination in southern Alaska: Implications for North Atlantic climate change during the last deglaciation

A debris-covered glacier at Kerguelen (49°S, 69°E) over the past 15 000 years

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