Holocene temperature evolution of the subpolar North Atlantic recorded in the Mg/Ca ratios of surface and thermocline dwelling planktonic foraminifers

Farmer, Elizabeth J.; Chapman, Mark R; Andrews, Julian E.

doi:10.1016/j.gloplacha.2011.02.003

Cited by 26 publications

(17 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sediment core MD99‐2251 was retrieved from the Gardar Drift of the subpolar North Atlantic Ocean. Farmer et al [] reconstructed the Mg/Ca SSTs (Figure d) using the G. bulloides from this core. As stated above as well as in Farmer et al [, ] that G. bulloides reflects surface water conditions during late spring to summer at site MD99‐2251, not the winter SSTs.…”

Section: Sst Of the Subpolar North Atlantic Oceansupporting

confidence: 62%

“…Farmer et al [] reconstructed the Mg/Ca SSTs (Figure d) using the G. bulloides from this core. As stated above as well as in Farmer et al [, ] that G. bulloides reflects surface water conditions during late spring to summer at site MD99‐2251, not the winter SSTs. Nevertheless, there is a rising trend in SSTs but again the onset is not at 4.5 ka but at 3.6 ka as can be seen from Figure d.…”

Section: Sst Of the Subpolar North Atlantic Oceanmentioning

confidence: 93%

“…Proxy records of sea surface temperatures (SSTs) from five subpolar North Atlantic Ocean sediment cores are plotted according to their independent age models. Alkenone‐derived SSTs from cores (a) Emerald Basin OCE326‐30GGC, (b) Laurentian Fan OCE326‐26GGC, and (c) Virginia slope CH07‐98‐19GGC [ Sachs , ]; Mg/Ca‐derived SSTs from the planktonic foram (b1) Neogloboquadrina pachyderma (s) and (b1) Globigerina bulloides from Laurentian Fan core OCE326‐26GGC [ Keigwin et al , ], and (d) northeast Atlantic Ocean core MD99‐2251 [ Farmer et al , ]. (e) Diatom assemblage‐derived SSTs from core LO09‐14 [ Berner et al , ].…”

Section: Sst Of the Subpolar North Atlantic Oceanmentioning

confidence: 99%

See 2 more Smart Citations

Comment on “Asynchronous variation in the East Asian winter monsoon during the Holocene” by Xiaojian Zhang, Liya Jin, and Na Li

et al. 2016

View full text Add to dashboard Cite

Comparing paleoproxy records throughout China and two climate models simulation results, Zhang et al. (2015) reported asynchronous Holocene spatiotemporal decline of the East Asian winter monsoon. Six sea surface temperature (SST) proxy records from the Atlantic Ocean and northern Indian Ocean and South China Sea were used to validate climate simulations results. However, the referred Mg/Ca SST record from the western Atlantic Ocean is simply nonexistent and the northeast Atlantic Mg/Ca SST data do not reflect winter SST as Zhang et al. (2015) argued to support the driving mechanisms. Furthermore, the western Indian Ocean SSTs data used in Zhang et al. (2015) do not reflect the winter SSTs or regional changes in the Holocene SSTs. Therefore, we question the validity of model simulation results and hence the reliability of conclusions in Zhang et al. (2015).

show abstract

Section: Sst Of the Subpolar North Atlantic Oceansupporting

confidence: 62%

Section: Sst Of the Subpolar North Atlantic Oceanmentioning

confidence: 93%

Section: Sst Of the Subpolar North Atlantic Oceanmentioning

confidence: 99%

See 1 more Smart Citation

Comment on “Asynchronous variation in the East Asian winter monsoon during the Holocene” by Xiaojian Zhang, Liya Jin, and Na Li

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Simultaneously, subsurface temperature records from the region document a gradual and/or stepwise warming from c. 3.7 to 3.0 ka BP (Fig. 5F, G ;Hall et al 2004;Thornalley et al 2009;Farmer et al 2011;Moros et al 2012). Related to this subsurface warming, several studies from the SE and W Greenland shelf report relatively warm surface and subsurface water conditions alongside increased phytoplankton productivity (Moros et al 2006bJennings et al 2011;Andresen et al 2013;Perner et al 2013Perner et al , 2016Sha et al 2014).…”

Section: Discussionmentioning

confidence: 73%

Subarctic Front migration at the Reykjanes Ridge during the mid‐ to late Holocene: evidence from planktic foraminifera

Perner

Moros

Jansen

et al. 2017

Boreas

View full text Add to dashboard Cite

Prins, M. A. 2018 (January): Subarctic Front migration at the Reykjanes Ridge during the mid-to late Holocene: evidence from planktic foraminifera. Boreas, Vol. 47, pp. 175-188. https://doi.org/10.1111/bor.12263. ISSN 0300-9483.Expansion of fresh and sea-ice loaded surface waters from the Arctic Ocean into the sub-polar North Atlantic is suggested to modulate the northward heat transport within the North Atlantic Current (NAC). The Reykjanes Ridge south of Iceland is a suitable area to reconstruct changes in the mid-to late Holocene fresh and sea-ice loaded surface water expansion, which is marked by the Subarctic Front (SAF). Here, shifts in the location of the SAF result from the interaction of freshwater expansion and inflow of warmer and saline (NAC) waters to the Ridge. Using planktic foraminiferal assemblage and concentration data from a marine sediment core on the eastern Reykjanes Ridge elucidates SAF location changes and thus, changes in the water-mass composition (upper~200 m) during the last c. 5.8 ka BP. Our foraminifer data highlight a late Holocene shift (at c. 3.0 ka BP) in water-mass composition at the Reykjanes Ridge, which reflects the occurrence of cooler and fresher surface waters when compared to the midHolocene. We document two phases of SAF presence at the study site: from (i) c. 5.5 to 5.0 ka BP and (ii) c. 2.7 to 1.5 ka BP. Both phases are characterized by marked increases in the planktic foraminiferal concentration, which coincides with freshwater expansions and warm subsurface water conditions within the sub-polar North Atlantic. We link the SAF changes, from c. 2.7 to 1.5 ka BP, to a strengthening of the East Greenland Current and awarming in the NAC, as identified by various studies underlying these two currents. From c. 1.5 ka BP onwards, we record a prominent subsurface cooling and continued occurrence of fresh and sea-ice loaded surface waters at the study site. This implies that the SAF migrated to the southeast of our core site during the last millennium.

show abstract

“…Within the North Atlantic G. bulloides has its highest abundance during late spring to summer, generally living at water depths of 60 m or less (Duplessy et al 1991;Schiebel et al 1997;Farmer et al 2011;Jonkers et al 2013b), but may also be linked to spring bloom events (Chapman 2010). In the Labrador Sea its presence is mainly linked to warm summer months (August) (Tolderland & Bé 1971;Hillaire-Marcel et al 2001b), with average sea surface temperature of c. 13 °C (Solignac et al 2004).…”

Section: Early (11000-7000 Bp) Versus Mid-to Late (7000 Bp To Presentmentioning

confidence: 99%

Holocene climate variability in the Labrador Sea

Hoogakker

McCave

Elderfield

et al. 2014

JGS

View full text Add to dashboard Cite

Formation of Labrador Sea Water proper commenced about 7000 years ago during the Holocene interglacial. To test whether fresher surface water conditions may have inhibited Labrador Sea Water convection during the early Holocene we measured planktonic foraminiferal ( Globigerina bulloides ) oxygen isotopes (δ 18 O) and Mg/Ca ratios at Orphan Knoll (cores HU91-045-093 and MD95-2024, 3488 m) in the Labrador Sea to reconstruct shallow subsurface summer conditions (temperature and seawater δ 18 O). Lighter foraminiferal δ 18 O values are recorded during the early Holocene between 11000 and 7000 years ago. Part of these lighter foraminiferal δ 18 O values can be explained by increased calcification temperatures. Reconstructed seawater δ 18 O values were, however, still on average 0.5‰ lighter compared with those of recent times, confirming that fresher surface waters in the Labrador Sea were probably a limiting factor in Labrador Sea Water formation during the early Holocene.

show abstract

Holocene temperature evolution of the subpolar North Atlantic recorded in the Mg/Ca ratios of surface and thermocline dwelling planktonic foraminifers

Cited by 26 publications

References 56 publications

Comment on “Asynchronous variation in the East Asian winter monsoon during the Holocene” by Xiaojian Zhang, Liya Jin, and Na Li

Comment on “Asynchronous variation in the East Asian winter monsoon during the Holocene” by Xiaojian Zhang, Liya Jin, and Na Li

Subarctic Front migration at the Reykjanes Ridge during the mid‐ to late Holocene: evidence from planktic foraminifera

Holocene climate variability in the Labrador Sea

Contact Info

Product

Resources

About