Gil, Isabelle M; Keigwin, Lloyd D; Abrantes, Fatima F (2015): Diatom, ice rafted debris and Neogloboquadrina pachyderma (sinistral) abundance in sediment core OCE326-GGC14 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.854452
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Abstract:
A high-resolution diatom census coupled with other proxy data from Laurentian Fan (LF) provides a detailed description of the last deglaciation, bringing new insight to that period by revealing directly the timing of sea-ice formation and melting. Cold events Heinrich Event 1 (H1) and the Younger Dryas (YD) were multiphase events. H1 (~16.8-15.7 cal kyr BP) was defined by a two-pulse release of icebergs promoting sea-ice formation. Melting of sea-ice after H1 corresponds to a cold and fresh anomaly that may have kept the Bølling colder than the Allerød. At ~13.6 cal kyr BP, a cooling trend culminated with sea-ice formation, marking the YD onset (~12.8 cal kyr BP). The decrease in sea-ice (~12.2 cal kyr BP) led to a YD second phase characterized by very cold winters. However, the contribution of warm water diatoms tends to increase at the same time and the YD gradual end (~11.6 cal kyr BP) contrasts with its abrupt end in Greenland ice cores. The YD cannot be regarded as an event triggered by a fresh water input through the Laurentian Channel since only one weak brief input nearly 1000 yrs after its onset is recorded. Very cold and cool conditions without ice mark the following Preboreal. A northward heat flux between 10.8 and 10.2 cal kyr BP was interrupted by the increased influence of coastal waters likely fed by inland melting. There was no further development of sea-ice or ice-drift then.
Supplement to:
Gil, Isabelle M; Keigwin, Lloyd D; Abrantes, Fatima F (2015): The deglaciation over Laurentian Fan: History of diatoms, IRD, ice and fresh water. Quaternary Science Reviews, 129, 57-67, https://doi.org/10.1016/j.quascirev.2015.10.006
Related to:
Gil, Isabelle M; Keigwin, Lloyd D; Abrantes, Fatima F (2016): Reply to comment received from A. E. Carlson et al. regarding “The deglaciation over Laurentian Fan: History of diatoms, IRD, ice and fresh water” by Gil et al. (2015), Quaternary Science Reviews 129, 57–67. Quaternary Science Reviews, 139, 166-169, https://doi.org/10.1016/j.quascirev.2016.03.001
Funding:
European Commission (EC), grant/award no. PEst-C/MAR/ LA0015/2011: European Regional Development Fund (ERDF) through the COMPETE e Operational Competitiveness Programme and national funds through FCT
Fundação para a Ciência e Tecnologia (FCT), grant/award no. PTDC/AAC-AMB/108449/2008: Integration of proxy data from the North Atlantic for modelling climatic events - MONA
National Science Foundation (NSF), grant/award no. OCE-0822854: Radiocarbon Ventilation Ages and Climate in the Northern Subtropical Atlantic
Coverage:
Latitude: 43.065980 * Longitude: -55.833200
Date/Time Start: 1998-07-06T00:00:00 * Date/Time End: 1998-07-06T00:00:00
Event(s):
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets
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Datasets listed in this bundled publication
- Gil, IM; Keigwin, LD; Abrantes, FF (2015): (Figure 4) Diatom species contribution in sediment core OCE326-GGC14. https://doi.org/10.1594/PANGAEA.854455
- Gil, IM; Keigwin, LD; Abrantes, FF (2015): (Figure 3G) Total diatom abundance in sediment core OCE326-GGC14. https://doi.org/10.1594/PANGAEA.854447
- Gil, IM; Keigwin, LD; Abrantes, FF (2015): (Figure 3H) Ice rafted debris (>150 µm) abundance in sediment core OCE326-GGC14. https://doi.org/10.1594/PANGAEA.854449
- Gil, IM; Keigwin, LD; Abrantes, FF (2015): (Figure 6) Ice rafted debris (>150 µm) composition of sediment core OCE326-GGC14. https://doi.org/10.1594/PANGAEA.854450
- Gil, IM; Keigwin, LD; Abrantes, FF (2015): (Figure 3J) Contribution of Neogloboquadrina pachyderma (sinistral) in sediment core OCE326-GGC14. https://doi.org/10.1594/PANGAEA.854451
- Gil, IM; Keigwin, LD; Abrantes, FF (2015): (Figure 3A-E) PCA factor scores in sediment core OCE326-GGC14. https://doi.org/10.1594/PANGAEA.854448