Abstract:Abstract. The recent retreat of nearly all glaciers and ice caps (GICs) located in Arctic regions is one of the most clear and visible signs of ongoing climate change. This paper synthesizes published records of Holocene GIC fluctuations from lake archives, placing their recent retreat into a longer–term context. Our compilation includes sixty–six lake–based GIC records (plus one non–lake–based record from the Russian Arctic) from seven Arctic regions: Alaska; the archipelagos of the eastern Canadian Arctic; G… Show more
“…The resulting regional climate patterns and GIC behaviour have been reviewed in detail by others, spanning a range of proxies (e.g. Briner et al ., 2016; McKay et al ., 2018; Larsen et al ., 2019; Larocca and Axford, 2021; Osman et al ., 2021) and are outlined only briefly here.…”
Section: Holocene Arctic Climate Change and Gic Behaviourmentioning
confidence: 99%
“…Recent warming is driving major changes across the Arctic system including precipitation patterns, sea ice extent, and permafrost thaw (Box et al ., 2019, McCrystall et al ., 2021). Almost all Arctic GICs are retreating (Leclercq et al ., 2012; Larocca and Axford, 2021), and are expected to lose up to ~35% of their volume by the end of the century (Overland et al ., 2019). This continued retreat will be accompanied by ongoing catchment change and is therefore pertinent to the following review.…”
Section: Holocene Arctic Climate Change and Gic Behaviourmentioning
confidence: 99%
“…**Sifs sediments are exposed in section as part of a larger sequence, and a sediment log is not presented here. Larocca and Axford, 2021), and are expected to lose up to ~35% of their volume by the end of the century (Overland et al, 2019). This continued retreat will be accompanied by ongoing catchment change and is therefore pertinent to the following review.…”
Lakes fed by Greenlandic mountain glaciers and ice caps (GICs) contain important archives of Arctic palaeoenvironmental change. GIC proglacial lake records have been increasingly used to reconstruct Holocene glacier behaviour, largely focusing on macrostratigraphy. However, despite the wide range of topographic settings and catchment characteristics, there has been little systematic analysis of the ways that catchment conditions are registered in the clastic sediments of GIC lakes. Such signals provide valuable insights into landscape processes and palaeoenvironmental conditions that are not routinely captured in other Quaternary glacial morphosedimentary archives. This review synthesises sedimentological and geochemical evidence from existing Holocene GIC proglacial lake records to establish: how catchment-wide conditions have been recorded in the lacustrine sequences; and our ability to isolate these signals to enhance palaeoenvironmental reconstruction. Our review shows that with careful sedimentological and targeted (bio)geochemical analyses coupled with a clear process-based understanding, catchment and in-lake signals can be effectively identified in the microstratigraphic and mineral grain record. Such signals include wind patterns, mass wasting, precipitation events and seasonal lake ice cover, that can complement broader palaeoclimatic proxy evidence. The approaches collated here, if more widely applied, could considerably enhance environmental reconstructions not only in Greenland, but in glaciated catchments elsewhere.
“…The resulting regional climate patterns and GIC behaviour have been reviewed in detail by others, spanning a range of proxies (e.g. Briner et al ., 2016; McKay et al ., 2018; Larsen et al ., 2019; Larocca and Axford, 2021; Osman et al ., 2021) and are outlined only briefly here.…”
Section: Holocene Arctic Climate Change and Gic Behaviourmentioning
confidence: 99%
“…Recent warming is driving major changes across the Arctic system including precipitation patterns, sea ice extent, and permafrost thaw (Box et al ., 2019, McCrystall et al ., 2021). Almost all Arctic GICs are retreating (Leclercq et al ., 2012; Larocca and Axford, 2021), and are expected to lose up to ~35% of their volume by the end of the century (Overland et al ., 2019). This continued retreat will be accompanied by ongoing catchment change and is therefore pertinent to the following review.…”
Section: Holocene Arctic Climate Change and Gic Behaviourmentioning
confidence: 99%
“…**Sifs sediments are exposed in section as part of a larger sequence, and a sediment log is not presented here. Larocca and Axford, 2021), and are expected to lose up to ~35% of their volume by the end of the century (Overland et al, 2019). This continued retreat will be accompanied by ongoing catchment change and is therefore pertinent to the following review.…”
Lakes fed by Greenlandic mountain glaciers and ice caps (GICs) contain important archives of Arctic palaeoenvironmental change. GIC proglacial lake records have been increasingly used to reconstruct Holocene glacier behaviour, largely focusing on macrostratigraphy. However, despite the wide range of topographic settings and catchment characteristics, there has been little systematic analysis of the ways that catchment conditions are registered in the clastic sediments of GIC lakes. Such signals provide valuable insights into landscape processes and palaeoenvironmental conditions that are not routinely captured in other Quaternary glacial morphosedimentary archives. This review synthesises sedimentological and geochemical evidence from existing Holocene GIC proglacial lake records to establish: how catchment-wide conditions have been recorded in the lacustrine sequences; and our ability to isolate these signals to enhance palaeoenvironmental reconstruction. Our review shows that with careful sedimentological and targeted (bio)geochemical analyses coupled with a clear process-based understanding, catchment and in-lake signals can be effectively identified in the microstratigraphic and mineral grain record. Such signals include wind patterns, mass wasting, precipitation events and seasonal lake ice cover, that can complement broader palaeoclimatic proxy evidence. The approaches collated here, if more widely applied, could considerably enhance environmental reconstructions not only in Greenland, but in glaciated catchments elsewhere.
“…The reconstruction of the chronology and magnitude of glacier recession periods are more complicated. Often proglacial lake sediments are used for this purpose (Larocca and Axford, 2021;Larocca et al, 2020;Leemann and Niessen, 1994;Nesje, 2009). Another way to reconstruct the timing, duration and the scale of glacier retreat in the past is the analysis of organic material primarily of in situ wood (e.g.…”
Three paleosols buried in the left lateral moraines of the Greater Azau Glacier (Northern Caucasus) were identified in an excavated outcrop (43.2658 N, 42.4766 E, 2370 m a.s.l.). When the glacier was overlying the surface of the lateral moraines at this site, the thickness of the ice was 50 m and more above the valley floor. Fragments of charcoal from the uppermost soil (S1) buried 0.6 m below the surface yielded the radiocarbon date 130 ± 20 yr BP (IGANAMS-6826) (AD 1680–1939). The middle soil (S2), buried at the depth of 13 m yielded two 14C dates 320 ± 20 yr BP (IGANAMS-8127) (bark of birch) (AD 1496–1641) and 1190 ± 20 yr BP (IGANAMS-8126) (AD 774–889) (charcoal). We suggest that the soil S2 has been formed between these dates during the Medieval Warm Period and in the early Little Ice Age. The lowermost (S3) unit lying 15 m below the surface is the thickest (0.4–0.6 m), well-developed paleosol. Charcoal collected at the top of S3, yielded the date 1300 ± 20 yr BP (IGANAMS-6826) (AD 663–773), indicating a prominent glacier advance occurred shortly before this date. Two dates from the charcoal buried at the bottom of S3 (2855 ± 20 yr BP (IGANAMS-8125) and 2880 ± 20 yr BP (IGANAMS-6827) mark the beginning of a long episode of restricted glacier extent that lasted for about 1600 years. The dates at the bottom of the S3 paleosol constrain the end of glacier advance that occurred before 2800–2900 14C yr BP. The timing of most prominent advances of the Greater Azau Glacier in the past 3500 years is in general agreement with the Late-Holocene glacial chronologies in the European Alps, Scandinavia and other regions of the Northern Hemisphere.
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