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  • 1
    Electronic Resource
    Electronic Resource
    Rapid subtropical North Atlantic salinity oscillations across Dansgaard–Oeschger cycles (2006)
    [s.l.] : Nature Publishing Group
    Nature 443 (2006), S. 561-564 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Geochemical and sedimentological evidence suggest that the rapid climate warming oscillations of the last ice age, the Dansgaard–Oeschger cycles, were coupled to fluctuations in North Atlantic meridional overturning circulation through its regulation of poleward heat flux. The balance ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature05121
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Links between salinity variation in the Caribbean and North Atlantic thermohaline circulation (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 428 (2004), S. 160-163 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Variations in the strength of the North Atlantic Ocean thermohaline circulation have been linked to rapid climate changes during the last glacial cycle through oscillations in North Atlantic Deep Water formation and northward oceanic heat flux. The strength of the thermohaline circulation ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02346
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    Paper (German National Licenses)
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  • 3
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    Geochemistry of Globigerinoides ruber of sediment core M78/1_235-1 (2017)
    PANGAEA
    In:  Supplement to: Bahr, André; Hoffmann, Julia; Schönfeld, Joachim; Schmidt, Matthew W; Nürnberg, Dirk; Batenburg, Sietske J; Voigt, Silke (2018): Low-latitude expressions of high-latitude forcing during Heinrich Stadial 1 and the Younger Dryas in northern South America. Global and Planetary Change, 160, 1-9, https://doi.org/10.1016/j.gloplacha.2017.11.008
    Details
    Publication Date: 2023-03-03
    Description: Changes in Atlantic Meridional Overturning Circulation (AMOC) strength exert a major influence on global atmospheric circulation patterns. However, the pacing and mechanisms of low-latitude responses to high-latitude forcing are insufficiently constrained so far. To elucidate the interaction of atmospheric and oceanic forcing in tropical South America dur-ing periods of major AMOC reductions (Heinrich Stadial 1 and the Younger Dryas) we gen-erated a high-resolution foraminiferal multi-proxy record from off the Orinoco River based on Ba/Ca and Mg/Ca ratios, as well as stable isotope measurements. The data clearly indi-cate a three-phased structure of HS1 based on the reconfiguration of ocean currents in the tropical Atlantic Ocean. The initial phase (HS1a) is characterized by a diminished North Brazil Current, a southward displacement of the ITCZ, and moist conditions dominating northeastern Brazil. During subsequent HS1b, the NBC was even more diminished or yet reversed and the ITCZ shifted to its southernmost position. Hence, dryer conditions pre-vailed in northern South America, while eastern Brazil experienced maximally wet condi-tions. During the final stage, HS1c, conditions are similar to HS1a. The YD represents a smaller amplitude version of HS1 with a southward-shifted ITCZ. Our findings imply that the low-latitude continental climate response to high-latitude forcing is mediated by recon-figurations of surface ocean currents in low latitudes. Our new records demonstrate the ex-treme sensitivity of the terrestrial realm in tropical South America to abrupt perturbations in oceanic circulation during periods of unstable climate conditions.
    Keywords: 235-1; AGE; DEPTH, sediment/rock; Globigerinoides ruber, Aluminium/Calcium ratio; Globigerinoides ruber, Barium/Calcium ratio; Globigerinoides ruber, Iron/Calcium ratio; Globigerinoides ruber, Magnesium/Calcium ratio; Globigerinoides ruber, Manganese/Calcium ratio; Globigerinoides ruber, δ13C; Globigerinoides ruber, δ18O; M78/1; M78/1_235-1; Meteor (1986); N. Tobago; PC; Piston corer; Sea surface temperature, annual mean; SST from Mg/Ca ratios; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 1818 data points
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  • 4
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    Nd isotope composition of sediment cores from the Florida Straits
    PANGAEA
    In:  Supplement to: Xie, Ruifang C; Marcantonio, Franco; Schmidt, Matthew W (2012): Deglacial variability of Antarctic Intermediate Water penetration into the North Atlantic from authigenic neodymium isotope ratios. Paleoceanography, 27(3), PA3221, https://doi.org/10.1029/2012PA002337
    Details
    Publication Date: 2023-05-12
    Description: Understanding intermediate water circulation across the last deglacial is critical in assessing the role of oceanic heat transport associated with Atlantic Meridional Overturning Circulation variability across abrupt climate events. However, the links between intermediate water circulation and abrupt climate events such as the Younger Dryas (YD) and Heinrich Event 1 (H1) are still poorly constrained. Here, we reconstruct changes in Antarctic Intermediate Water (AAIW) circulation in the subtropical North Atlantic over the past 25 kyr by measuring authigenic neodymium isotope ratios in sediments from two sites in the Florida Straits. Our authigenic Nd isotope records suggest that there was little to no penetration of AAIW into the subtropical North Atlantic during the YD and H1. Variations in the northward penetration of AAIW into the Florida Straits documented in our authigenic Nd isotope record are synchronous with multiple climatic archives, including the Greenland ice core d18O record, the Cariaco Basin atmosphere Delta14C reconstruction, the Bermuda Rise sedimentary Pa/Th record, and nutrient and stable isotope data from the tropical North Atlantic. The synchroneity of our Nd records with multiple climatic archives suggests a tight connection between AAIW variability and high-latitude North Atlantic climate change.
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 5
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    (Table S1) Age determination of sediment core KNR166-2_51
    PANGAEA
    In:  Supplement to: Schmidt, Matthew W; Weinlein, William A; Marcantonio, Franco; Lynch-Stieglitz, Jean (2012): Solar forcing of Florida Straits surface salinity during the early Holocene. Paleoceanography, 27(3), PA3204, https://doi.org/10.1029/2012PA002284
    Details
    Publication Date: 2023-06-27
    Description: Previous studies showed that sea surface salinity (SSS) in the Florida Straits as well as Florida Current transport covaried with changes in North Atlantic climate over the past two millennia. However, little is known about earlier Holocene hydrographic variability in the Florida Straits. Here, we combine Mg/Ca-paleothermometry and stable oxygen isotope measurements on the planktonic foraminifera Globigerinoides ruber (white variety) from Florida Straits sediment core KNR166-2 JPC 51 (24° 24.70' N, 83° 13.14' W, 198 m deep) to reconstruct a high-resolution (~25 yr/sample) early to mid Holocene record of sea surface temperature and d18OSW (a proxy for SSS) variability. After removing the influence of global d18OSW change due to continental ice volume variability, we find that early Holocene SSS enrichments are associated with increased evaporation/precipitation ratios in the Florida Straits during periods of reduced solar forcing, increased ice rafted debris in the North Atlantic and the development of more permanent El Niño-like conditions in the eastern equatorial Pacific. When considered with previous high-resolution reconstructions of Holocene tropical atmospheric circulation changes, our results provide evidence that variations in solar forcing over the early Holocene had a significant impact on the global tropical hydrologic cycle.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; DEPTH, sediment/rock; Florida Strait; KN166-2; Knorr; KNR166-2; KNR166-2-51; Laboratory code/label; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 35 data points
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  • 6
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    (Table 2) Age determination of Florida Straits sediment cores
    PANGAEA
    In:  Supplement to: Lynch-Stieglitz, Jean; Schmidt, Matthew W; Curry, William B (2011): Evidence from the Florida Straits for Younger Dryas ocean circulation changes. Paleoceanography, 26(1), PA1205, https://doi.org/10.1029/2010PA002032
    Details
    Publication Date: 2023-06-27
    Description: The waters passing through the Florida Straits today reflect both the western portion of the wind-driven subtropical gyre and the northward flow of the upper waters which cross the equator, compensating North Atlantic Deep Water export as part of the large-scale Atlantic meridional overturning circulation. It has been postulated from various lines of evidence that the overturning circulation was weaker during the Younger Dryas cold event of the last deglaciation. We show here that the contrast in the oxygen isotopic composition of benthic foraminiferal tests across the Florida Current is reduced during the Younger Dryas. This most likely reflects a decrease in the density gradient across the channel and a decrease in the vertical shear of the Florida Current. This reduced shear is consistent with the postulated reduction in the Atlantic meridional overturning circulation. We find that the onset of this change in density structure and flow at the start of the Younger Dryas is very abrupt, occurring in less than 70 years.
    Keywords: Age, 14C AMS; Age, 14C calibrated; Age, comment; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; DEPTH, sediment/rock; Elevation of event; Event label; Florida Strait; GC; Gravity corer; KN166-2; Knorr; KNR166-2; KNR166-2-127; KNR166-2-132; KNR166-2-26; KNR166-2-26JPC; KNR166-2-29; KNR166-2-29JPC; KNR166-2-31; KNR166-2-31JPC; KNR166-2-73; KNR166-2-73GGC; Latitude of event; Longitude of event; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 350 data points
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  • 7
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    (Table 1) Age determination of sediment core KNR166-2-26
    PANGAEA
    In:  Supplement to: Schmidt, Matthew W; Lynch-Stieglitz, Jean (2011): Florida Straits deglacial temperature and salinity change: Implications for tropical hydrologic cycle variability during the Younger Dryas. Paleoceanography, 26(4), PA4205, https://doi.org/10.1029/2011PA002157
    Details
    Publication Date: 2023-06-27
    Description: The prevailing paradigm of abrupt climate change holds that rapid shifts associated with the most extreme climate swings of the last glacial cycle were forced by changes in the strength and northward extension of Atlantic Meridional Overturning Circulation (AMOC), resulting in an abrupt reorganization of atmospheric circulation patterns with global teleconnections. To determine the timing of tropical Atlantic atmospheric circulation changes over the past 21 ka BP, we reconstruct high resolution sea surface temperature and d18OSW (a proxy for surface salinity) records based on Mg/Ca ratios and oxygen isotope measurements in the planktonic foraminifera Globigerinoides ruber from a sediment core located on the western margin of the Florida Straits. As a proxy for meltwater discharge influence on Florida Straits surface water salinity, we also measured Ba/Ca ratios in G. ruber from the same core. Results show that riverine influence on Florida Straits surface water started by 17.2 ka BP and ended by 13.6 ka BP, 600 years before the start of the Younger Dryas (YD) cold interval. The initiation of the YD is marked by an abrupt increase in Florida Straits d18OSW values, indicating a shift to elevated sea surface salinity occurring in 130 years, most likely resulting from increased regional aridity and/or reduced precipitation. In order to resolve the timing of tropical atmospheric circulation change relative to AMOC variability across this transition, we compare the timing of surface water changes to a recently published record of Florida Current variability in the same core reconstructed from benthic oxygen isotope measurements. We find synchronous changes in atmospheric and ocean circulation on the transition into the YD, consistent with an abrupt reduction in AMOC as the driver of tropical Atlantic atmospheric circulation change at this time.
    Keywords: Age, 14C AMS; Age, 14C calibrated, CALIB 6.0 and Marine09 (Reimer et al., 2009); Age, comment; Age, dated; Age, dated material; Age, dated standard deviation; Calendar age; Calendar age, standard deviation; DEPTH, sediment/rock; Florida Strait; KN166-2; Knorr; KNR166-2; KNR166-2-26; KNR166-2-26JPC; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 111 data points
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  • 8
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    (Table SI-2) Stable oxygen isotope and Mg/Ca ratios of Globigerinoides ruber from sediment core V28-122
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; also published as VM28-122; Calculated; Calculated from Mg/Ca ratios (Dekens et al. 2002); DEPTH, sediment/rock; Globigerinoides ruber white, Magnesium/Calcium ratio; Globigerinoides ruber white, δ18O; PC; Piston corer; Sea surface temperature, annual mean; V28; V28-122; Vema; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 309 data points
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  • 9
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    (Table S1) Carbon and CaCO3 content in sediment core KNR166-2_26
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; Calcium carbonate; Carbon, organic, total; DEPTH, sediment/rock; Florida Strait; KN166-2; Knorr; KNR166-2; KNR166-2-26; KNR166-2-26JPC; PC; Piston corer
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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  • 10
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    (Table 2) Authigenic Fe-Mn leachate and detrital fraction Nd isotope ratios of sediment core KNR166-2_31
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: AGE; DEPTH, sediment/rock; Florida Strait; KN166-2; Knorr; KNR166-2; KNR166-2-31; KNR166-2-31JPC; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; PC; Piston corer; ε-Neodymium; ε-Neodymium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 124 data points
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