Gulf Stream and Western Boundary Undercurrent variations during MIS 10–12 at Site 1056, Blake-Bahama Outer Ridge

Chaisson, William P; Poli, Maria-Serena; Thunell, Robert C.

doi:10.1016/s0025-3227(02)00324-9

Cited by 29 publications

(30 citation statements)

References 45 publications

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“…Measured variations of lithological and physical parameters are similar to standard isotope curves and are obviously related to orbitally tuned climatic forcing. This is con¢rmed by ¢rst oxygen isotope results (Franz and Tiedemann, 2002;Chaisson et al, 2002) from Site 1056 which covers Marine Isotope Stages (MIS) 8^12 and was measured on planktonic (N. dutertrei) and benthic (C. wuellersdor¢) foraminifera. The N 18 O curves which primarily indicate variations in global ice volume, are in good correlation with the carbonate content record at Site 1056 (Fig.…”

Section: Materials Data and Initial Datingmentioning

confidence: 72%

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Astronomical age models for Pleistocene drift sediments from the western North Atlantic (ODP Sites 1055–1063)

et al. 2002

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Ten ODP sites drilled in a depth transect (2164^4775 m water depth) during Leg 172 recovered high-deposition rate ( s 20 cm/kyr) sedimentary sections from sediment drifts in the western North Atlantic. For each site an age model covering the past 0.8^0.9 Ma has been developed. The time scales have a resolution of 10^20 kyr and are derived by tuning variations of estimated carbonate content to the orbital parameters precession and obliquity. Based on the similarity in the signature of proxy records and the spectral character of the time series, the sites are divided into two groups: precession cycles are better developed in carbonate records from a group of shallow sites (21642 975 m water depth, Sites 1055^1058) while the deeper sites (2995^4775 m water depth, Sites 1060^1063) are characterized by higher spectral density in the obliquity band. The resulting time scales show excellent coherence with other dated carbonate and isotope records from low latitudes. Besides the typical Milankovitch cyclicity significant variance of the resulting carbonate time series is concentrated at millennial-scale changes with periods of about 12, 6, 4, 2.5, and 1.5 kyr. Comparisons of carbonate records from the Blake Bahama Outer Ridge and the Bermuda Rise reveal a remarkable similarity in the time and frequency domain indicating a basin-wide uniform sedimentation pattern during the last 0.9 Ma. ß

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Section: Materials Data and Initial Datingmentioning

confidence: 72%

“…We used the available isotope data (Chaisson et al, 2002;Franz and Tiedemann, 2002) (Fig. 2) to test if there is a signi¢cant lag between carbonate and oxygen isotope curves at Site 1056.…”

Section: Astronomical Calibrationmentioning

confidence: 99%

Astronomical age models for Pleistocene drift sediments from the western North Atlantic (ODP Sites 1055–1063)

et al. 2002

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“…Glacial MIS 8 conditions were not fully developed, also observed in several North Atlantic cores and ice cores [ Helmke and Bauch , 2003; Petit et al , 1999; Raymo et al , 1997], and might imply a continuous supply of nutrients to the Southern Ocean through the thermohaline circulation (Figure 5c). During glacial MIS 10, a millennial fluctuation of δ 18 O in foraminifera records was observed at the subtropical region of the North Atlantic Ocean [ Billups et al , 2004; Chaisson et al , 2002]. These fluctuations in planktonic foraminifera records indicate surface warming in the North Atlantic Ocean and an increase in flow of North Atlantic Deep Water (NADW) [ Billups et al , 2004; Chaisson et al , 2002; Oppo et al , 1998].…”

Section: Discussionmentioning

confidence: 99%

“…During glacial MIS 10, a millennial fluctuation of δ 18 O in foraminifera records was observed at the subtropical region of the North Atlantic Ocean [ Billups et al , 2004; Chaisson et al , 2002]. These fluctuations in planktonic foraminifera records indicate surface warming in the North Atlantic Ocean and an increase in flow of North Atlantic Deep Water (NADW) [ Billups et al , 2004; Chaisson et al , 2002; Oppo et al , 1998]. The NADW flow during glacial periods might have increased the nutrient supply to the Southern Ocean, resulting in the same trends of depleted δ 15 N D values and small variation between glacial and interglacial during both MIS 8 and MIS 10 (Figures 5c and 3b).…”

Section: Discussionmentioning

confidence: 99%

Nutrient regime at the siliceous belt of the Atlantic sector of the Southern Ocean during the past 660 ka

et al. 2008

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[1] Sediment cores from Ocean Drilling Program sites 1094 and 1093 hold the most extensive and most detailed records of carbon and nitrogen isotopes of diatom-bound organic matter in the Atlantic sector of the Southern Ocean over the past 660 ka. These records were combined with summer sea surface temperatures and winter sea ice that were deduced from diatom transfer functions to reconstruct the nutrient regime at the northern and southern boundaries of the siliceous belt at latitudes 53°S and 50°S, respectively. The strong coupling between carbon and nitrogen isotope records at site 1093 suggests that the diatom productivity was influenced mainly by changes in nutrient availability. The anticorrelation between the carbon and nitrogen isotopes at site 1094 suggests that the diatom productivity was closely linked to global temperature changes, sea ice coverage, and dissolved CO 2 concentration. A detailed comparison of the nitrogen isotope records between the two sites shows three time intervals that represent different nutrient regimes. The nutrients at site 1093, which is close to the Polar Front, were dominated by eddies and meanders that sustained relatively high productivity at times of stratification or reduced ventilation, whereas at site 1094 the nutrients were influenced by ventilation processes.Citation: Schneider-Mor, A., R. Yam, C. Bianchi, M. Kunz-Pirrung, R. Gersonde, and A. Shemesh (2008), Nutrient regime at the siliceous belt of the Atlantic sector of the Southern Ocean during the past 660 ka, Paleoceanography, 23, PA3217,

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“…For example, there is great variability in the specific measurement methods applied, which include some relatively simple methods (e.g., number of structures-Moore & Hovel, 2010; measurements of rugosity- Pittman et al, 2007) as well as more elaborate assessments (e.g., fractal geometry- Jeffries, 1993;Gee & Warwick, 1994). Others applied complexity measurements in a creative way, relating thermal stratification (a surrogate of habitat diversity) as an influential factor in explaining foraminifera diversity along a broad temporal scale (Chaisson et al, 2002). Thus, the lack of standardization in measurements of habitat complexity may hamper comparisons among different studies.…”

Section: Discussionmentioning

confidence: 99%

Flying over water: how “On bird species diversity” influenced aquatic ecology

et al. 2011

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Habitat complexity has long been known to influence animal community structure by increasing the number of available habitats. Fifty years have passed since MacArthur brothers published the seminal paper ''On bird species diversity'', which revolutionized studies of habitat structure. This paper first evidenced and quantified the relationship between species diversity (birds) and habitat structural complexity (the number of stratified layers of landscape vegetation). In this article, we aim to pay homage to R. H. MacArthur's contribution and to briefly analyze the citation history and influence of ''On bird species diversity'', focusing primarily on aquatic studies. We searched for all papers that cited ''On bird species diversity'' on Thomson Reuters (ISI-Web of Knowledge) and analyzed them for temporal citation trends. In addition, considering only aquatic papers, we explored whether and how habitat complexity was measured, as well as the ecological organization level, attributes of organisms, taxonomic groups and study design (observational or experimental). ''On bird species diversity'' citations increased over time, but this paper was less cited by limnologists compared to terrestrial and marine scientists. The majority of investigations in aquatic ecosystems quantified habitat complexity, but few used mathematical modeling. The high number of citations, which continues to increase, shows the great influence of ''On bird species diversity'' on ecological studies and typifies it as a classic in the ecological literature. However, the low citation frequency found in papers devoted to freshwater ecosystems indicates that limnologists in general neglect this original contribution in studies of habitat complexity.

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Gulf Stream and Western Boundary Undercurrent variations during MIS 10–12 at Site 1056, Blake-Bahama Outer Ridge

Cited by 29 publications

References 45 publications

Astronomical age models for Pleistocene drift sediments from the western North Atlantic (ODP Sites 1055–1063)

Astronomical age models for Pleistocene drift sediments from the western North Atlantic (ODP Sites 1055–1063)

Nutrient regime at the siliceous belt of the Atlantic sector of the Southern Ocean during the past 660 ka

Flying over water: how “On bird species diversity” influenced aquatic ecology

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