Glacial–interglacial surface water variations in the Caribbean Sea during the last 300 ky based on calcareous nannofossil analysis

Kameo, Koji; Shearer, Michelle C.; Droxler, André W.; Mita, Isao; Watanabe, Rika; Sato, Tokiyuki

doi:10.1016/s0031-0182(04)00304-9

Cited by 22 publications

(23 citation statements)

References 26 publications

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“…During low sea levels the Cariaco Basin was isolated from the open Caribbean by the shallower sills, restricting the import of nutrient‐rich subsurface waters (i.e., Subtropical Underwater [cf. Kameo et al , 2004]), and keeping the MIS 4 productivity levels below those of MIS 3. However, the intensity of upwelling‐favorable winds during sea level highstands would have had an additional effect on the productivity intensity and the establishment of bottom water anoxia at shorter time scales.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, there is some evidence showing that the nutrient concentration of the SUW varied at glacial‐interglacial scales, since the main supply of thermocline waters coming from the North Atlantic subtropical gyre changed drastically. Reconstructions of stable isotopes in benthic foraminifera from the Bahama Bank [ Slowey and Curry , 1995], and coccolithophorid assemblages in the central Caribbean [ Kameo et al , 2004] both indicate a SUW depleted in nutrients during glacial intervals. Similarly, at millennial time scales, a Caribbean record of calcareous dinoflagellates from core M35003‐4 shows regular excursions to extremely oligotrophic conditions during HEs [ Vink et al , 2001].…”

Section: Discussionmentioning

confidence: 99%

“…Studies on paleoproductivity are therefore important because they place constraints on past ocean circulation, nutrient distribution and on the history of the oceanic carbon cycle. In spite of the significant role that the Caribbean Sea plays in the heat and mass transport from the tropics to higher latitudes [e.g., Gordon , 1967; Metcalf , 1976; Mooers and Maul , 1998; Schmidt et al , 2004], studies on late Quaternary paleoproductivity in this region are scarce [ J. I. Martinez et al , 2007; Kameo et al , 2004]. The Caribbean Sea is generally characterized by nutrient‐depleted surface waters.…”

Section: Introductionmentioning

confidence: 99%

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Reconstructing marine productivity of the Cariaco Basin during marine isotope stages 3 and 4 using organic‐walled dinoflagellate cysts

et al. 2008

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[1] An organic-walled dinoflagellate cyst analysis was carried out on sediment core MD03-2622, retrieved from the Cariaco Basin. The core comprises the 73-30 ka interval. Down core changes in cyst abundance, accumulation rate, and composition of cyst assemblages were used to identify climatic and oceanographic changes at orbital and millennial time scales in this near-equatorial seasonal upwelling area. Throughout the sequence, dinoflagellate cyst assemblages were dominated by heterotrophic dinocysts (mainly Brigantedinium spp.), with the exception of four autotrophic-dominated (mainly Spiniferites ramosus) intervals around 58, 53, 46, and 37 ka. At orbital time scales, changes in the dinoflagellate productivity seem to follow low-latitude insolation, with the highest productivities coinciding with maximum February insolation (47-38 ka). At millennial scales, cyst accumulation rates appeared to coincide with Dansgaard-Oeschger (D-O) variability, with significant increments occurring during warm interstadials. The opposite was true during stadials. Short periods of high nutrient availability and stratified conditions followed Heinrich events H4, H5, H5a, and H6 and concurred with enhanced river runoff. Spectral analyses confirm the existence of these and other higherfrequency periodicities and support the idea of a tightly coupled terrestrial/marine and tropical/high-latitude climate system during the last glacial period.Citation: González, C., L. M. Dupont, K. Mertens, and G. Wefer (2008), Reconstructing marine productivity of the Cariaco Basin during marine isotope stages 3 and 4 using organic-walled dinoflagellate cysts, Paleoceanography, 23, PA3215,

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reconstructing marine productivity of the Cariaco Basin during marine isotope stages 3 and 4 using organic‐walled dinoflagellate cysts

et al. 2008

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“…Core 999A was raised from the Kogi Rise at a depth of 2,827 m, about 1000 m above the turbidite‐laden floor of the Colombian Basin [ Mutti , 2000]. The site is directly influenced by the warm Caribbean Current and is ideally suited to reconstruct changes in southern Caribbean surface water hydrography as demonstrated by the recent study of calcareous nannofossil populations over the same interval at Site 999A [ Kameo et al , 2004].…”

Section: Study Area and Itcz Variationmentioning

confidence: 99%

Western Caribbean sea surface temperatures during the late Quaternary

Schmidt

Vautravers

Spero

2006

Geochem Geophys Geosyst

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[1] Mg/Ca ratios in the planktonic foraminifera Globigerinoides ruber from Colombian Basin core ODP 999A suggest that Caribbean sea surface temperatures (SSTs) were from 2.1 to 2.7°C colder than the present during the last three glacial maximums. In comparison, faunal derived SSTs (SIMMAX method) show that August SSTs in the Caribbean varied <2°C over the past 360 kyr, whereas February SSTs varied between 21.0°C and 26.5°C. Changes in the Mg/Ca-SST record contain a strong 23 kyr periodicity, suggesting the Mg/Ca-SST record reflects a warm season weighted SST average rather than an annual mean SST. Combining several dissolution indices, we identify brief periods of decreased carbonate preservation in our record and show that MIS 11 stands out as the most intensive dissolution cycle in the Caribbean over the last 460 kyr. Comparison of Caribbean SST change with a similar estimate of tropical SST variability in the western Pacific over the past 360 kyr reveals shifts in the east-west tropical SST gradient that are coeval with glacial-interglacial climate change and consistent both with a southward migration of the glacial ITCZ and with a glacial El Niño-like mode of tropical circulation.

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“…For example, Florisphaera profunda dwells within the lower photic zone of stratified subtropical waters, and its relative abundance (or ratios with other coccolithophores) has been used in a large range of paleoceanographic investigations [ Castradori , 1993; Jordan et al , 1996; Kinkel et al , 2000; Sprovieri et al , 2003; Di Stefano and Incarbona , 2004; Prabhu and Shankar , 2005; Incarbona et al , 2008a, 2008b] in the Indian Ocean, Atlantic Ocean, and Mediterranean Sea [ Beaufort et al , 1997, 2001; Henriksson , 2000; Beaufort et al , 2001; Incarbona et al , 2008c]. Literature suggests that F. profunda is a productivity proxy at low to middle latitudes of the North Atlantic Ocean when the upper photic zone is nutrient depleted and its production enhances in comparison with other coccolithophorid species [ Molfino and McIntyre , 1990a, 1990b; McIntyre and Molfino , 1996; Broerse et al , 2000; Flores et al , 2000; Henriksson , 2000; Beaufort and Heussner , 2001; Haidar and Thierstein , 2001; Sprengel et al , 2002; Colmenero‐Hidalgo et al , 2004; Kameo et al , 2004].…”

Section: Introductionmentioning

confidence: 99%

Primary productivity variability on the Atlantic Iberian Margin over the last 70,000 years: Evidence from coccolithophores and fossil organic compounds

et al. 2010

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[1] This study analyzes coccolithophore abundance fluctuations (e.g., Emiliania huxleyi, Gephyrocapsa specimens, and Florisphaera profunda) in core MD01-2444 sediment strata retrieved at the Iberian Margin, northeastern Atlantic Ocean. Coccolithophores are calcareous nannofossils, a major component of the oceanic phytoplankton, which provide information about past ecological and climatological variability. Results are supported by data on fossil organic compounds (sea surface temperatures, alkenones, and n-hexacosan-1-ol index) and geochemical analyses (benthic d 13 C cc and planktonic d 18 O cc isotopes). Three scenarios are taken into account for this location at centennial-scale resolution over the last 70,000 years: the Holocene and the stadial and interstadial modes. The different alternatives are described by means of elements such as nutrients; upwelling phenomena; temperatures at surface and subsurface level; or the arrival of surface turbid, fresh, and cold waters due to icebergs, low sea level, increased aridity, and dust. During the Holocene, moderate primary productivity was observed (mainly concentrated in E. huxleyi specimens); surface temperatures were at maxima while the water column was highly ventilated by northern-sourced polar deep waters and warmer subsurface, nutrient-poor subtropical waters. Over most of the last glacial stadials, surface productivity weakened (higher F. profunda and reworked specimen percentages and lower diunsaturated and triunsaturated C 37 alkenones); the arrival of cold Arctic surface waters traced by tetraunsaturated C 37 peaks and large E. huxleyi, together with powerful ventilated southern-sourced polar deep waters, disturbed, in all likelihood, the delicate vertical equilibrium while preventing significant upwelling mixing. Finally, during the last glacial interstadials (lower F. profunda percentages, nonreworked material, and higher diunsaturated and triunsaturated C 37 alkenones) a combined signal is observed: warm surface temperatures were concurrent with generally low oxygenation of the deep-sea floor, moderate arrival of northern-sourced deep waters, and subsurface cold, nutrient-rich, recently upwelled waters, probably of polar origin; these particular conditions may have promoted vertical mixing while enhancing surface primary productivity (mainly of Gephyrocapsa specimens).

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Glacial–interglacial surface water variations in the Caribbean Sea during the last 300 ky based on calcareous nannofossil analysis

Cited by 22 publications

References 26 publications

Reconstructing marine productivity of the Cariaco Basin during marine isotope stages 3 and 4 using organic‐walled dinoflagellate cysts

Reconstructing marine productivity of the Cariaco Basin during marine isotope stages 3 and 4 using organic‐walled dinoflagellate cysts

Western Caribbean sea surface temperatures during the late Quaternary

Primary productivity variability on the Atlantic Iberian Margin over the last 70,000 years: Evidence from coccolithophores and fossil organic compounds

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