Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity

Łącka, Magdalena; Cao, Min; Rosell‐Melé, Antoni; Pawłowska, Joanna; Kucharska, Małgorzata; Forwick, Matthias; Zajączkowski, Marek

doi:10.1016/j.quascirev.2019.105973

Cited by 18 publications

(18 citation statements)

References 86 publications

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“…The samples were then loaded into a MiSeq instrument for a paired-end run of 2 × 150 cycles (foraminifera) and 2 × 250 cycles (diatoms). The processing of the high-throughput sequencing (HTS) data was performed according to procedures described by Lejzerowicz et al (2013) and Pawłowska et al (2014). The post-sequencing data processing was performed with the use of the SLIM web app (Dufresne et al, 2019) and included demultiplexing the libraries, joining the paired-end reads, chimera removal, operational taxonomic units (OTUs) clustering and taxonomic assignment.…”

Section: Ancient Dna Analysismentioning

confidence: 99%

“…Recent studies have demonstrated the preservation of DNA in marine sediments for tens to hundreds of thousands of years. An aDNA approach was successfully applied to trace the Holocene history of dinoflagellates, haptophytes (e.g., Coolen et al, 2009Coolen et al, , 2013Boere et al, 2009) and foraminifera in deep-sea (Lejzerowicz et al, 2013) and coastal areas (Pawłowska et al, 2014(Pawłowska et al, , 2016. The study of Pawłowska et al (2016) was the first attempt to utilize foraminiferal aDNA as a paleoenvironmental proxy.…”

Section: Introductionmentioning

confidence: 99%

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Multiproxy evidence of the Neoglacial expansion of Atlantic Water to eastern Svalbard

et al. 2020

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Abstract. The main goal of this study is to reconstruct the paleoceanographic development of Storfjorden during the Neoglacial (∼4 cal ka BP). Storfjorden is one of the most important brine factories in the European Arctic and is responsible for deepwater production. Moreover, it is a climate-sensitive area influenced by two contrasting water masses: warm and saline Atlantic Water (AW) and cold and fresh Arctic Water (ArW). Herein, a multiproxy approach was applied to provide evidence for existing interactions between the inflow of AW and sea ice coverage, which are the major drivers of environmental changes in Storfjorden. The sedimentary and microfossil records indicate that a major reorganization of oceanographic conditions in Storfjorden occurred at ∼2.7 cal ka BP. The cold conditions and the less pronounced presence of AW in Storfjorden during the early phase of the Neoglacial were the prerequisite conditions for the formation of extensive sea ice cover. The period after ∼2.7 cal ka BP was characterized by alternating short-term cooling and warming intervals. Warming was associated with pulsed inflows of AW and sea ice melting that stimulated phytoplankton blooms and organic matter supply to the bottom. The cold phases were characterized by heavy and densely packed sea ice, resulting in decreased productivity. The ancient environmental DNA (aDNA) records of foraminifera and diatoms support the occurrence of the major pulses of AW (∼2.3 and ∼1.7 cal ka BP) and the variations in sea ice cover. The episodes of enhanced AW inflow were marked by an increase in the percentage of DNA sequences of monothalamous foraminifera associated with the presence of fresh phytodetritus. Cold and less productive intervals were marked by an increased proportion of monothalamous taxa known only from environmental sequencing. The diatom aDNA record indicates that primary production was continuous during the Neoglacial, regardless of the sea ice conditions. However, the colder periods were characterized by the presence of diatom taxa associated with sea ice, whereas the present-day diatom assemblage is dominated by open-water taxa.

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Section: Ancient Dna Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiproxy evidence of the Neoglacial expansion of Atlantic Water to eastern Svalbard

et al. 2020

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“…Finally, the formation of vivianite concretions found in Storfjordrenna required numerous active forms of iron, known to be released in large amounts by glacial meltwaters 30,31 . The appearance of vivianite in three adjacent sediment samples deposited likely in the earliest YD confirms a dramatic transition from ameliorated conditions during B-A with constant AW inflow 13,22 to anoxic conditions that likely resulted from enhanced stratification, perennial sea-ice cover, and reduced advection of AW (Fig. 4).…”

Section: Resultsmentioning

confidence: 64%

“…Chronostratigraphic units are indicated: B-A-Bølling-Allerød; YD-Younger Dryas; PBO-Pre-Boreal Oscillation. ( A ) alkenone-based SST 22 (left scale; black line) and SST from central Baffin Bay 16 (right scale; light orange line) with five-point running average (right scale; dark orange line); ( B ) content of vivianite nodules; ( C ) total benthic foraminiferal abundance (right scale; red line) and foraminiferal biodiversity expressed as number of species (left scale; black line); ( D ) Mn/Fe ratio; ( E ) Elphidium clavatum δ 18 O; ( F ) IRD flux; ( G ) Sea ice proxy P III P 25 from Kveithola Trough 20 . The black triangles on the x-axis denote the obtained AMS 14 C datings converted to calibrated radiocarbon ages.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the remnants of the Svalbard-Barents Sea ice sheet (SBIS) formed a partly protecting embayment around the core site 13 , potentially supporting anoxic conditions as vertical water mixing may have been limited due to strong water stratification caused by a brackish water surface layer deriving from meltwater runoff. The absence of foraminifera likely results from bottom-water anoxia and limited food supply due to low primary production (reflected by a lack of alkenones signals 22 ; Fig. 2 A).…”

Section: Resultsmentioning

confidence: 99%

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Multiproxy paleoceanographic study from the western Barents Sea reveals dramatic Younger Dryas onset followed by oscillatory warming trend

Łącka

Michalska

Pawłowska

et al. 2020

Sci Rep

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The Younger Dryas (YD) is recognized as a cool period that began and ended abruptly during a time of general warming at the end of the last glacial. New multi-proxy data from a sediment gravity core from Storfjordrenna (western Barents Sea, 253 m water depth) reveals that the onset of the YD occurred as a single short-lived dramatic environment deterioration, whereas the subsequent warming was oscillatory. The water masses in the western Barents Sea were likely strongly stratified at the onset of the YD, possibly due to runoff of meltwater combined with perennial sea-ice cover, the latter may last up to several decades without any brake-up. Consequently, anoxic conditions prevailed at the bottom of Storfjordrenna, leading to a sharp reduction of benthic biota and the appearance of vivianite microconcretions which formation is favoured by reducing conditions. While the anoxic conditions in Storfjordrenna were transient, the unfavorable conditions for benthic foraminifera lasted for c. 1300 years. We suggest that the Pre-Boreal Oscillation, just after the onset of the Holocene, may have been a continuation of the oscillatory warming trend during the YD.

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Low-latitude control on sea surface temperatures in the middle Okinawa Trough over the last 3.6 kyr

Dou

Zhao

et al. 2021

Geo-Mar Lett

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Postglacial paleoceanography of the western Barents Sea: Implications for alkenone-based sea surface temperatures and primary productivity

Cited by 18 publications

References 86 publications

Multiproxy evidence of the Neoglacial expansion of Atlantic Water to eastern Svalbard

Multiproxy evidence of the Neoglacial expansion of Atlantic Water to eastern Svalbard

Multiproxy paleoceanographic study from the western Barents Sea reveals dramatic Younger Dryas onset followed by oscillatory warming trend

Low-latitude control on sea surface temperatures in the middle Okinawa Trough over the last 3.6 kyr

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