Oceanic versus continental influences over the last 7 kyrs from a mid-shelf record in the northern Bay of Biscay (NE Atlantic)

Penaud, Aurélie; Ganne, Axelle; Eynaud, Frédérique; Lambert, Clément; Coste, Pierre-Olivier; Herlédan, Maïwen; Vidal, Muriel; Goslin, Jérôme; Stéphan, Pierre; Charria, Guillaume; Pailler, Yvan; Durand, Mathieu; Zumaque, Jéna; Mojtahid, Meryem

doi:10.1016/j.quascirev.2019.106135

Cited by 22 publications

(73 citation statements)

References 104 publications

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“…The decrease in markers of fluvial influence recorded in a marine core from the northern Bay of Biscay (Site 2, Fig. 1) also testify to the decrease of the Loire contribution 11,21 during the 1.7-1.4 ka AP event in the BB. Furthermore, between 2700 and 800 years BP, precipitation quantifications carried out in speleothems of northern Spain 34 (Site 4, Figs.…”

Section: Resultsmentioning

confidence: 68%

“…2J). Lingulodinium machaerophorum, an estuarine-proliferating species 29,30 that tolerates strong drops in salinity 29,31 , testifies to coastal stratified waters subject to strong continental influence 11,21 and, thus, to stronger fluvial discharges at the studied site. Humid conditions together with an increase of fluvial inputs may explain the Corylus pollen rise during the 1.7-1.4 ka AP event in the BB.…”

Section: Resultsmentioning

confidence: 90%

“…2F) was observed between 1700 and 1400 years BP in a sediment core retrieved at the outlet of the Loire River 33 . This signal was interpreted as a result of a smaller contribution of Loire River discharges and thus of lower runoff over Loire watersheds 11,33 . The decrease in markers of fluvial influence recorded in a marine core from the northern Bay of Biscay (Site 2, Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Ocean surface density differences reconstructed south of Iceland and foraminifera shell isotopic analyses conducted in a core from the northern Bay of Biscay (Sites 2 and 5, Fig. 1) provide evidence of SPG strengthening intervals 9,11 (Fig. 2C,D), which led to a greater northward penetration of the warmer NAC in the northern Atlantic Ocean to the Nordic Seas [13][14][15][16][17] .…”

mentioning

confidence: 97%

“…The Holocene is a complex puzzle of climate variability [1][2][3][4][5][6][7][8][9][10][11] , characterized at a millennial-scale by a 2500-year solar-related cyclicity over the whole period, and the appearance of a 1500-year ocean-related cyclicity over the last 5000 years, i.e. during the Mid-to Late-Holocene 12 .…”

mentioning

confidence: 99%

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Striking forest revival at the end of the Roman Period in north-western Europe

Lambert

Penaud²,

Vidal³

et al. 2020

Sci Rep

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The Holocene period (last 11,700 years BP) has been marked by significant climate variability over decadal to millennial timescales. The underlying mechanisms are still being debated, despite ocean–atmosphere–land connections put forward in many paleo-studies. Among the main drivers, involving a cluster of spectral signatures and shaping the climate of north-western Europe, are solar activity, the North Atlantic Oscillation (NAO) varying atmospheric regimes and North Atlantic oceanic gyre dynamics. Over the last 2500 years BP, paleo-environmental signals have been strongly affected by anthropogenic activities through deforestation and land use for crops, grazing, habitations, or access to resources. Palynological proxies (especially pollen grains and marine or freshwater microalgae) help to highlight such anthropogenic imprints over natural variability. Palynological analyses conducted in a macro-estuarine sedimentary environment of north-western France over the last 2500 years BP reveal a huge and atypical 300 year-long arboreal increase between 1700 and 1400 years BP (around 250 and 550 years AD) that we refer to as the ‘1.7–1.4 ka Arboreal Pollen rise event’ or ‘1.7–1.4 ka AP event’. Interestingly, the climatic 1700–1200 years BP interval coincides with evidence for the withdrawal of coastal societies in Brittany (NW France), in an unfavourable socio-economic context. We suggest that subpolar North Atlantic gyre strengthening and related increasing recurrence of storminess extremes may have affected long-term coastal anthropogenic trajectories resulting in a local collapse of coastal agrarian societies, partly forced by climatic degradation at the end of the Roman Period.

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Section: Resultsmentioning

confidence: 68%