Holocene variability in sea ice and primary productivity in the northeastern Baffin Bay

Saini, Jeetendra; Stein, Rüdiger; Fahl, Kirsten; Weiser, Jens; Hebbeln, Dierk; Hillaire‐Marcel, Claude; Vernal, Anne de

doi:10.1007/s41063-020-00075-y

Cited by 18 publications

(55 citation statements)

References 128 publications

(215 reference statements)

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“…In this context, our low IP 25 flux values appear puzzling. A similar low IP 25 signal from the neighboring core GeoB19927 has been interpreted to reflect low sea-ice concentrations under the influence of a persistent WGC (Saini et al, 2020).…”

Section: F I G U R Ementioning

confidence: 73%

“…GeoB19927 (Saini et al, 2020), and marked increase in the dinoflagellate cyst fluxes, notably involving a decline in O. centrocarpum and steady increase in the spring bloomer Pentapharsodinium dalei at our study site (Caron et al, 2019). A steep decline in the contribution of the marginal ice zone group is shortly followed by a pronounced increase in the "drift-ice/pack-ice"…”

Section: F I G U R Ementioning

confidence: 75%

“…As suggested byHansen et al (2020) the input of highly saline corrosive deep Arctic water or brines may have impeded the growth (or preservation) of benthic calcareous foraminifera at our study site during this interval.In phase with a progressive decline in IP 25 , suggesting a transition to earlier seasonal sea-ice retreat, diatom production rises markedly until c. 4.4 kyr BP. At core GeoB19927, this is associated with sustained high dinosterol fluxes(Saini et al, 2020). During this interval, diatom assemblages are largely dominated by the centric species T. antarctica var.…”

mentioning

confidence: 98%

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Learning from the past: Impact of the Arctic Oscillation on sea ice and marine productivity off northwest Greenland over the last 9,000 years

Limoges

Weckström²,

Ribeiro

et al. 2020

Global Change Biology

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Section: F I G U R Ementioning

confidence: 73%

Section: F I G U R Ementioning

confidence: 75%

mentioning

confidence: 98%

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Learning from the past: Impact of the Arctic Oscillation on sea ice and marine productivity off northwest Greenland over the last 9,000 years

Limoges

Weckström²,

Ribeiro

et al. 2020

Global Change Biology

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“…High counts of this element therefore indicate a minimal contribution of terrestrial-sourced material to the bulk sediment (Calvert and Pedersen, 1993;Rothwell and Croudace, 2015). K and Rb are both typical for environments with terrestrial influence (Saito, 1998;Steenfelt, 2001;Steenfelt at al., 1998). The Ca/Ti and Ca/Sr ratios can be used as indicators of the marine biogenic origin of Ca (Bahr et al, 2005;Richter et al, 2005).…”

Section: Geochemistrymentioning

confidence: 96%

Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay

Hansen¹,

Giraudeau²,

Wacker³

et al. 2020

Clim. Past

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Abstract. Baffin Bay is a semi-enclosed basin connecting the Arctic Ocean and the western North Atlantic, thus making out a significant pathway for heat exchange. Here we reconstruct the alternating advection of relatively warmer and saline Atlantic waters versus the incursion of colder Arctic water masses entering Baffin Bay through the multiple gateways in the Canadian Arctic Archipelago and the Nares Strait during the Holocene. We carried out benthic foraminiferal assemblage analyses, X-ray fluorescence scanning, and radiocarbon dating of a 738 cm long marine sediment core retrieved from eastern Baffin Bay near Upernavik, Greenland (Core AMD14-204C; 987 m water depth). Results reveal that eastern Baffin Bay was subjected to several oceanographic changes during the last 9.2 kyr. Waning deglacial conditions with enhanced meltwater influxes and an extensive sea-ice cover prevailed in eastern Baffin Bay from 9.2 to 7.9 ka. A transition towards bottom water amelioration is recorded at 7.9 ka by increased advection of Atlantic water masses, encompassing the Holocene Thermal Maximum. A cold period with growing sea-ice cover at 6.7 ka interrupts the overall warm subsurface water conditions, promoted by a weaker northward flow of Atlantic waters. The onset of the neoglaciation at ca. 2.9 ka is marked by an abrupt transition towards a benthic fauna dominated by agglutinated species, likely in part explained by a reduction of the influx of Atlantic Water, allowing an increased influx of the cold, corrosive Baffin Bay Deep Water originating from the Arctic Ocean to enter Baffin Bay through the Nares Strait. These cold subsurface water conditions persisted throughout the Late Holocene, only interrupted by short-lived warmings superimposed on this cooling trend.

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“…They indicate an overall dense sea-ice cover with temporal changes in concentration or seasonal extent. Data from cores collected in the surrounding subarctic seas of the North Atlantic, in particular, the Greenland, Norwegian, and Barents seas, as well as the Baffin Bay also show relatively large amplitude variations in their winter and spring sea-ice cover but mostly illustrate an increasing trend from the thermal optimum of the early–middle Holocene characterized by low sea-ice cover, toward the neoglacial high sea-ice cover of the very late Holocene ( 16 , 22 – 28 ). Hence, the information available for the present interglacial relates mostly to the Arctic shelves and subarctic seas.…”

mentioning

confidence: 99%

Natural variability of the Arctic Ocean sea ice during the present interglacial

Vernal

Hillaire‐Marcel

Duc

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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The impact of the ongoing anthropogenic warming on the Arctic Ocean sea ice is ascertained and closely monitored. However, its long-term fate remains an open question as its natural variability on centennial to millennial timescales is not well documented. Here, we use marine sedimentary records to reconstruct Arctic sea-ice fluctuations. Cores collected along the Lomonosov Ridge that extends across the Arctic Ocean from northern Greenland to the Laptev Sea were radiocarbon dated and analyzed for their micropaleontological and palynological contents, both bearing information on the past sea-ice cover. Results demonstrate that multiyear pack ice remained a robust feature of the western and central Lomonosov Ridge and that perennial sea ice remained present throughout the present interglacial, even during the climate optimum of the middle Holocene that globally peaked ∼6,500 y ago. In contradistinction, the southeastern Lomonosov Ridge area experienced seasonally sea-ice-free conditions, at least, sporadically, until about 4,000 y ago. They were marked by relatively high phytoplanktonic productivity and organic carbon fluxes at the seafloor resulting in low biogenic carbonate preservation. These results point to contrasted west–east surface ocean conditions in the Arctic Ocean, not unlike those of the Arctic dipole linked to the recent loss of Arctic sea ice. Hence, our data suggest that seasonally ice-free conditions in the southeastern Arctic Ocean with a dominant Arctic dipolar pattern, may be a recurrent feature under “warm world” climate.

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Holocene variability in sea ice and primary productivity in the northeastern Baffin Bay

Cited by 18 publications

References 128 publications

Learning from the past: Impact of the Arctic Oscillation on sea ice and marine productivity off northwest Greenland over the last 9,000 years

Learning from the past: Impact of the Arctic Oscillation on sea ice and marine productivity off northwest Greenland over the last 9,000 years

Reconstruction of Holocene oceanographic conditions in eastern Baffin Bay

Natural variability of the Arctic Ocean sea ice during the present interglacial

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