Quaternary Arctic Ocean sea ice variations and radiocarbon reservoir age corrections

Hanslik, Daniela; Jakobsson, Martin; Backman, Jan; Björck, Svante; Sellén, Emma; O’Regan, Matt; Fornaciari, Eliana; Skog, Göran

doi:10.1016/j.quascirev.2010.06.011

Cited by 84 publications

(63 citation statements)

References 62 publications

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“…However, average sedimentation rates in the central Arctic Ocean over longer time periods must be compared with great caution since there are indications of large fluctuations over time. For example, Hanslik et al (2010) note that MIS 2 appears to be absent in the studied core from the Lomonosov Ridge, and this is also found in cores from the Amerasian Basin (Adler et al, 2009). This may be linked to the presence of extensive ice shelves Jakobsson et al, 2010) and overall cold oceanographic conditions during glacial periods preventing melt out and delivery of sediments.…”

Section: Arctic Ocean Sediment Stratigraphymentioning

confidence: 73%

“…The same abundance pattern is noted for both planktic and benthic foraminifera when comparing MIS 3 and 1. Hanslik et al (2010) suggest that this signal may reflect different circulation regimes in the central Arctic Ocean with more inflow of Atlantic water during the MIS 3 interstadials, as well as less dense sea ice cover compared to the present interglacial, although they do not rule out that different sedimentation rates during the two periods may skew the results. Reduced sea ice during MIS 3 does not agree with the ostracode results of Cronin et al (2010).…”

Section: Arctic Ocean Sea Icementioning

confidence: 85%

“…Interestingly, a sediment core analyzed from the central Lomonosov Ridge reported in this issue by Hanslik et al (2010) contains exceptionally high abundances of calcareous micro-and nannofossils during parts of MIS 3; as much as 30 times more nannofossils are counted per mm 2 for MIS 3 peaks compared to that in MIS 1 deposits. The same abundance pattern is noted for both planktic and benthic foraminifera when comparing MIS 3 and 1.…”

Section: Arctic Ocean Sea Icementioning

confidence: 92%

“…2). The core from the Lomonosov Ridge studied by Hanslik et al (2010) reveals prominent dips in abundance during the Younger Dryas cold period as well as 10e8 ka, suggesting that colder conditions and more severe sea ice cover existed at these times. This is not seen clearly in the AASII .…”

Section: Arctic Ocean Sea Icementioning

confidence: 99%

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New insights on Arctic Quaternary climate variability from palaeo-records and numerical modelling

Jakobsson

Long

Inǵólfsson

et al. 2010

Quaternary Science Reviews

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a b s t r a c tTerrestrial and marine geological archives in the Arctic contain information on environmental change through Quaternary interglacialeglacial cycles. The Arctic Palaeoclimate and its Extremes (APEX) scientific network aims to better understand the magnitude and frequency of past Arctic climate variability, with focus on the "extreme" versus the "normal" conditions of the climate system. One important motivation for studying the amplitude of past natural environmental changes in the Arctic is to better understand the role of this region in a global perspective and provide base-line conditions against which to explore potential future changes in Arctic climate under scenarios of global warming. In this review we identify several areas that are distinct to the present programme and highlight some recent advances presented in this special issue concerning Arctic palaeo-records and natural variability, including spatial and temporal variability of the Greenland Ice Sheet, Arctic Ocean sediment stratigraphy, past ice shelves and marginal marine ice sheets, and the Cenozoic history of Arctic Ocean sea ice in general and Holocene oscillations in sea ice concentrations in particular. The combined sea ice data suggest that the seasonal Arctic sea ice cover was strongly reduced during most of the early Holocene and there appear to have been periods of ice free summers in the central Arctic Ocean. This has important consequences for our understanding of the recent trend of declining sea ice, and calls for further research on causal links between Arctic climate and sea ice.

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Section: Arctic Ocean Sediment Stratigraphymentioning

confidence: 73%

Section: Arctic Ocean Sea Icementioning

confidence: 85%

Section: Arctic Ocean Sea Icementioning

confidence: 92%

Section: Arctic Ocean Sea Icementioning

confidence: 99%

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New insights on Arctic Quaternary climate variability from palaeo-records and numerical modelling

Jakobsson

Long

Inǵólfsson

et al. 2010

Quaternary Science Reviews

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“…An age model based on eleven radiocarbon analyses on planktic foraminifer from TC-18, has been proposed by Hanslik et al 20 High-resolution 210 Pb data allowed us to carry over this age model to MC-18 as illustrated in Figure 2. The sedimentation rate is estimated to be 1.7 cm ka − 1 during the Holocene.…”

Section: Resultsmentioning

confidence: 99%

Enhanced sea-ice export from the Arctic during the Younger Dryas

Not

Hillaire‐Marcel

2012

Nat Commun

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Water mass exchange between the Nordic seas and the Arctic Ocean on millennial timescale during MIS 4–MIS 2

Rasmussen

Thomsen

Nielsen

2014

Geochem Geophys Geosyst

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[1] The climate of the last glaciation circa 65,000-25,000 years ago was interrupted by about 15 abrupt temperature fluctuations, the so-called Dansgaard-Oeschger events consisting of warm interstadials and cold stadials recorded in Greenland ice cores. The largest fluctuations occur in the North Atlantic region, but they have been registered over the most of the world. The events are linked to changes in deep water formation in the Nordic seas and North Atlantic, disrupting the thermohaline circulation. Yet, Dansgaard-Oeschger events have so far not been recorded north of the convection areas in the central Nordic seas, and it is not known if they affected the water exchange between the Nordic seas and the Arctic Ocean. In this study, we analyze core JM05-31GC from the northern Fram Strait at the very entrance to the Arctic Ocean. The core contains sediments from marine isotope stages (MISs) 4-2. The results show millennial timescale shifts in all the investigated proxies including the distribution of planktonic and benthic foraminifera, planktonic and benthic oxygen and carbon isotopes, and several sedimentological parameters. In JM05-31GC, the interstadials are characterized by relatively high surface and low bottom water temperatures, low content of ice-rafted debris, and well-ventilated bottom water. Stadials are characterized by the presence of icebergs and decreasing surface water and increasing bottom water temperatures due to increased inflow of Atlantic subsurface water. Ventilation decreased during Heinrich events and most stadials. The results show that the DansgaardOeschger events strongly affected the water exchange between the Nordic seas and the Arctic Ocean.

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Quaternary Arctic Ocean sea ice variations and radiocarbon reservoir age corrections

Cited by 84 publications

References 62 publications

New insights on Arctic Quaternary climate variability from palaeo-records and numerical modelling

New insights on Arctic Quaternary climate variability from palaeo-records and numerical modelling

Enhanced sea-ice export from the Arctic during the Younger Dryas

Water mass exchange between the Nordic seas and the Arctic Ocean on millennial timescale during MIS 4–MIS 2

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