Dinocyst-based reconstructions of sea ice cover concentration during the Holocene in the Arctic Ocean, the northern North Atlantic Ocean and its adjacent seas

Vernal, Anne de; Hillaire‐Marcel, Claude; Rochon, André; Fréchette, Bianca; Henry, Maryse; Solignac, Sandrine; Bonnet, Sophie

doi:10.1016/j.quascirev.2013.07.006

Cited by 148 publications

(168 citation statements)

References 70 publications

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“…8a; Stein et al, 2017), suggesting less sea-ice conditions in the periods. The low sea-ice concentration during 9-7.5 ka is consistent with the results of previous studies based on dinoflagellate cyst and IP 25 records showing the widespread sea-ice retreat in the Arctic Ocean, which was attributed to higher summer insolation during the early Holocene (Dyke and Savelle, 2001;Vare et al, 2009;de Vernal et al, 2013;Stein et al, 2017). On the other hand, the sea-ice retreat during 5.5-4 ka cannot be explained by higher summer insolation.…”

Section: Ocean Circulation Sea Ice and Biological Productionsupporting

confidence: 91%

“…8;de Vernal et al, 2005de Vernal et al, , 2008de Vernal et al, , 2013Farmer et al, 2011;Polyak et al, 2016). This pattern contrasts with reconstructions from other Arctic regions that show lower sea-ice concentrations in the early Holocene (de Vernal et al, 2013). This discrepancy suggests that the intensified BG circulation exported more ice from the Beaufort Sea to the northeastern Chukchi Sea margin.…”

Section: Ocean Circulation Sea Ice and Biological Productionmentioning

confidence: 72%

“…Sea-ice concentrations in the Chukchi Sea during the Holocene were reconstructed by dinoflagellate cysts (de Vernal et al, 2005(de Vernal et al, , 2013Farmer et al, 2011) and biomarker IP 25 Stein et al, 2017).…”

Section: Ocean Circulation Sea Ice and Biological Productionmentioning

confidence: 99%

“…5). In comparison, intense BSI, a crucial agent of heat transport from the North Pacific to the Arctic Ocean, along with a weaker BG in the middle (Stein et al, 2017), and isoprenoid GDGT and brassicasterol concentrations (Stein et al, 2017) in core ARA02B 01A-GC; (b) CK / I and C / I ratios in core HLY0510-5JPC/TC, IP 25 concentrations in core HLY0510-5JPC , and mean annual sea ice cover concentration (scale from 0 to 10) estimated from dinoflagellate cyst assemblages in cores 05JPC and GGC19 (de Vernal et al, 2013).…”

Section: Ocean Circulation Sea Ice and Biological Productionmentioning

confidence: 99%

“…During the late Holocene, characterized by the weakest BG and moderate BSI, sea-ice concentrations were intermediate and strongly variable (Fig. 8;de Vernal et al, 2008de Vernal et al, , 2013Polyak et al, 2016). The nutrient supply by the BSI potentially affects marine production in the Chukchi Sea.…”

Section: Ocean Circulation Sea Ice and Biological Productionmentioning

confidence: 99%

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Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

et al. 2017

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Abstract. The Beaufort Gyre (BG) and the Bering Strait inflow (BSI) are important elements of the Arctic Ocean circulation system and major controls on the distribution of Arctic sea ice. We report records of the quartz / feldspar and chlorite / illite ratios in three sediment cores from the northern Chukchi Sea, providing insights into the long-term dynamics of the BG circulation and the BSI during the Holocene. The quartz / feldspar ratio, interpreted as a proxy of the BG strength, gradually decreased during the Holocene, suggesting a long-term decline in the BG strength, consistent with an orbitally controlled decrease in summer insolation. We propose that the BG rotation weakened as a result of the increasing stability of sea-ice cover at the margins of the Canada Basin, driven by decreasing insolation. Millennial to multi-centennial variability in the quartz / feldspar ratio (the BG circulation) is consistent with fluctuations in solar irradiance, suggesting that solar activity affected the BG strength on these timescales. The BSI approximation by the chlorite / illite record, despite a considerable geographic variability, consistently shows intensified flow from the Bering Sea to the Arctic during the middle Holocene, which is attributed primarily to the effect of higher atmospheric pressure over the Aleutian Basin. The intensified BSI was associated with decrease in sea-ice concentrations and increase in marine production, as indicated by biomarker concentrations, suggesting a major influence of the BSI on sea-ice and biological conditions in the Chukchi Sea. Multi-century to millennial fluctuations, presumably controlled by solar activity, were also identified in a proxy-based BSI record characterized by the highest age resolution.

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Section: Ocean Circulation Sea Ice and Biological Productionsupporting

confidence: 91%

Section: Ocean Circulation Sea Ice and Biological Productionmentioning

confidence: 72%

Section: Ocean Circulation Sea Ice and Biological Productionmentioning

confidence: 99%

Section: Ocean Circulation Sea Ice and Biological Productionmentioning

confidence: 99%

Section: Ocean Circulation Sea Ice and Biological Productionmentioning

confidence: 99%

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Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

et al. 2017

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Palynological evidence for late Quaternary climate and marine primary productivity changes along the California margin

2015

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A high-resolution sedimentary record of dinoflagellate cysts from Ocean Drilling Program Hole 1017E (off Point Conception, California margin) reflects how marine primary productivity has changed in response to major shifts in climate and ocean circulation along the California margin over the past 42 kyr. Throughout the studied sequence, dinoflagellate cyst assemblages are dominated by upwelling-related taxa, signifying the continued presence of coastal upwelling on the margin during the late Quaternary. The cyst record suggests that marine primary productivity was enhanced during the Holocene and Bølling, and to a lesser extent, during the late glacial and most Dansgaard-Oeschger events, while an apparent reduction in primary productivity can be seen during the Younger Dryas. The best analogue technique, based on a modern dinoflagellate cyst assemblage database from the northeast Pacific, was used for quantitative reconstruction of past sea surface conditions. It points to dynamic changes in annual marine primary productivity (~235-331 g C m À2 yr À1) and sea surface temperature (~10.1-12.6°C in winter;~13.1-14.3°C in summer), while sea surface salinity appears to be confined to a narrower range (~32.9-33.4 in summer). Our results also indicate noticeable climate variability during the Holocene in this region.

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Large Holocene summer temperature oscillations and impact on the peopling of the northeastern Tibetan Plateau

Hou

Huang

Zhao

et al. 2016

Geophysical Research Letters

163

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Summer temperatures on the Tibetan Plateau (TP) significantly affect stability of glaciers that provide steady water resources to nearly half of the world population. However, lack of reliable, long‐term proxy records greatly impedes understanding of regional temperature sensitivity to climate forcings. Here we present a 16 ka long, alkenone‐based summer temperature record from Lake Qinghai, northeastern TP that demonstrates major regional temperature response to changes in summer insolation and Atlantic Meridional Overturning Circulation during the Holocene and late glacial. Importantly, we find a period of sustained summer temperature decline (>4°C) between 5 and 3.5 ka, which coincides with expansion of Barents Sea ice coverage and is likely driven by intensification of the Westerlies. This unusually long and pronounced regional cooling event likely delayed permanent human settlements on the high‐altitude regions (>3000 m) of the TP by at least 500 years.

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Dinocyst-based reconstructions of sea ice cover concentration during the Holocene in the Arctic Ocean, the northern North Atlantic Ocean and its adjacent seas

Cited by 148 publications

References 70 publications

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

Holocene dynamics in the Bering Strait inflow to the Arctic and the Beaufort Gyre circulation based on sedimentary records from the Chukchi Sea

Palynological evidence for late Quaternary climate and marine primary productivity changes along the California margin

Large Holocene summer temperature oscillations and impact on the peopling of the northeastern Tibetan Plateau

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