Mid-latitude Southern Indian Ocean response to Northern Hemisphere Heinrich events

Sicre, Marie‐Alexandrine; Labeyrie, Laurent D; Ezat, Ullah; Duprat, J.; Turon, J. L.; Schmidt, Sabine; Michel, Élisabeth; Mazaud, Alain

doi:10.1016/j.epsl.2005.09.032

Cited by 63 publications

(50 citation statements)

References 47 publications

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“…Furthermore, the SST estimate of 9°C determined in the nearby surface sediment (box-core HM107-2798) is consistent with the recent compilation produced by Hanna et al (2006), reporting that since 1874, July and August SSTs measured at Grimsey island have varied between 6.7°C and 9°C (see Table 3 in Hanna et al, 2006). The close correspondence between the surface sediment SST value and the instrumental data suggests that alkenones are reliably recording summer SSTs and that potential bias from surface water advection can be ruled out (Conte et al, 2006;Sicre et al, 2005;. Modern SST values also emphasize a significant warming over the past decades.…”

Section: Methodssupporting

confidence: 77%

Decadal variability of sea surface temperatures off North Iceland over the last 2000 years

Sicre

Jacob

Ezat

et al. 2008

Earth and Planetary Science Letters

150

115

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Section: Methodssupporting

confidence: 77%

Decadal variability of sea surface temperatures off North Iceland over the last 2000 years

Sicre

Jacob

Ezat

et al. 2008

Earth and Planetary Science Letters

150

115

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“…In low productivity regions such as the Labrador Sea, lateral advection of detrital alkenones can represent a significant component of surface sediments. Earlier studies suggest that alkenones drifting with strong surface currents can potentially generate significant deviation from in situ SSTs [ Sicre et al , 2005; Rühlemann and Butzin , 2006]. Higher than expected values in DA04‐31P may therefore point to a contribution of alkenones that were produced in distant warmer waters.…”

Section: Resultsmentioning

confidence: 88%

Multiple‐stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger Current warm water transport

et al. 2011

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There is limited knowledge pertaining to the history of the Greenland Ice Sheet (GIS) during the last glacial‐interglacial transition as it retreated from the continental margins to an inland position. Here we use multiproxy data, including ice‐rafted debris (IRD); planktonic isotopes; alkenone temperatures; and tephra geochemistry from the northern Labrador Sea, off southwest Greenland, to investigate the deglacial response of the GIS and evaluate its implications for the North Atlantic deglacial development. The results imply that the southern GIS retreated in three successive stages: (1) early deglaciation of the East Greenland margins, by tephra‐rich IRD that embrace Heinrich Event 1; (2) progressive retreat during Allerød culminating in major meltwater releases (δ18O depletion of 1.2‰) at the Allerød–Younger Dryas transition (12.8–13.0 kyr B.P.); and (3) a final stage of glacial recession during the early Holocene (∼9–11 kyr B.P.). Rather than indicating local temperatures of ambient surface water, the alkenones likely were transported to the core site by the Irminger Current. We attribute the timing of GIS retreat to the incursion of warm intermediate waters along the base of grounded glaciers and below floating ice shelves on the continental margin. The results lend support to the view that GIS meltwater presented a forcing factor for the Younger Dryas cooling.

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“…The most remarkable discrepancy between our reconstructions is the anomalous warm SST alk found in the South Adriatic Sea in the early phase of the deglaciation, centred at ∼ 16.5 kyr. Although we cannot rule out the contribution of advected detrital alkenones (Sicre et al, 2005;Rühlemann and Butzin, 2006), this anomaly most probably reflects a shift in the alkenone production. Today, in the western Mediterranean Sea and Adriatic Sea blooms of E. huxleyi occur in spring and fall (Ternois et al, 1996;Sicre et al, 1999;Totti et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Seemingly divergent sea surface temperature proxy records in the central Mediterranean during the last deglaciation

et al. 2013

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Sea surface temperatures (SSTs) were reconstructed over the last 25 000 yr using alkenone paleothermometry and planktonic foraminifera assemblages from two cores of the central Mediterranean Sea: the MD04-2797 core (Siculo–Tunisian channel) and the MD90-917 core (South Adriatic Sea). Comparison of the centennial scale structure of the two temperature signals during the last deglaciation period reveals significant differences in timing and amplitude. We suggest that seasonal changes likely account for seemingly proxy record divergences during abrupt transitions from glacial to interglacial climates and for the apparent short duration of the Younger Dryas (YD) depicted by the alkenone time series, a feature that has already been stressed in earlier studies on the Mediterranean deglaciation

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Mid-latitude Southern Indian Ocean response to Northern Hemisphere Heinrich events

Cited by 63 publications

References 47 publications

Decadal variability of sea surface temperatures off North Iceland over the last 2000 years

Decadal variability of sea surface temperatures off North Iceland over the last 2000 years

Multiple‐stage deglacial retreat of the southern Greenland Ice Sheet linked with Irminger Current warm water transport

Seemingly divergent sea surface temperature proxy records in the central Mediterranean during the last deglaciation

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