cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.1594/pangaea.742958
title: Age determination of ODP Hole 108-658C (Table 1)

description: A detailed (ca. 100 yr resolution) and well-dated (18 AMS 14C dates to 23 cal. ka BP) record of latest Pleistocene–Holocene variations in terrigenous (eolian) sediment deposition at ODP Site 658C off Cap Blanc, Mauritania documents very abrupt, large-scale changes in subtropical North African climate. The terrigenous record exhibits a well-defined period of low influx between 14.8 and 5.5 cal. ka BP associated with the African Humid Period, when the Sahara was nearly completely vegetated and supported numerous perennial lakes; an arid interval corresponding to the Younger Dryas Chronozone punctuates this humid period. The African Humid Period has been attributed to a strengthening of the African monsoon due to gradual orbital increases in summer season insolation. However, the onset and termination of this humid period were very abrupt, occurring within decades to centuries. Both transitions occurred when summer season insolation crossed a nearly identical threshold value, which was 4.2% greater than present. These abrupt climate responses to gradual insolation forcing require strongly non-linear feedback processes, and current coupled climate model studies invoke vegetation and ocean temperature feedbacks as candidate mechanisms for the non-linear climate sensitivity. The African monsoon climate system is thus a low-latitude corollary to the bi-stable behavior of high-latitude deep ocean thermohaline circulation, which is similarly capable of rapid and large-amplitude climate transitions.
description: Supplement to: deMenocal, Peter B; Ortiz, Joseph D; Guilderson, Thomas P; Adkins, Jess F; Sarnthein, Michael; Baker, Linda; Yarusinsky, Martha (2000): Abrupt onset and termination of the African Humid Period: rapid climate responses to gradual insolation forcing. Quaternary Science Reviews, 19(1-5), 347-361
DOI: 10.1594/pangaea.745322
title: Tab. 1: Ar40/Ar39 results from Kuyul terrane, northeastern Russia

description: The Kamchatka Peninsula of northeastern Russia is located along the northwestern margin of the Bering Sea and consists of zones of complexly deformed accreted terranes. Along the northern portion of the peninsula, progressing from then orthwestem Bering Sea inland the Olyutorskiy, Ukelayat, and Koryak superterranes area acreted to the Okhotsk-Chukotsk volcanic-plutonic bell in northern-most Kamchatka. A sedimentary sequence of Albian to Maastrichtian age overlap terranes and units of the Koryak superterrane and constrains their accretion time with this region of the North America plate. Ophiolite complexes, widespread within the Koryak superterrane, are associated with serpentinite melanges and some of the ophiolite terranes include large portions of weakly serpentinized hyperbasites, layered gabbro, sheeted dikes, and pillow basalts outcropping as internally coherent blocks within a sheared melange matrix. Interpretation of magnetic anomalies allow the correlation of the Ukelayat with the West Kamchatka and Sredinny Range superterranes. The Olyutorskiy composite terrane may be correlated with the central and southern Kamchatka Peninsula Litke, Eastern Ranges and Vetlov composite terranes. The most "out-board" of the central and southern Kamchatka Peninsula terranes is the Kronotsky composite terrane, weil exposed along the Kamchatka, Kronotsky and Shipunsky Capes. Using regional geological constraints, paleomagnetism, and plate kinematic models for the Pacific basin a regional model can be proposed in which accretion of the Koryak composite terrane to the North America plate occurs during the Campanian-Maastrichtian, followed by the accretion of the Olyutorskiy composite terrane in the Middle Eocene, and the Late Oligocene-Early Miocene collision of the Kronotsky composite terrane. A revised age estimate of a key overlapping sedirnentary sequence of the Koryak superterrane, calibrated with new Ar40/Ar39 data, supports its Late Cretaceous accretion age.
description: Samples run against standard MMhb-l with an age of 513.9 Ma and processed using the constants of STEIGER & JAGER (1977).
description: Supplement to: Harbert, W; Kepezhinskas, Pavel A; Krylov, K; Grigoriev, V; Sokolov, Serguei; Aleksuitin, M; Heiphetz, A; Layer, P (2000): Paleomagnetism and tectonics of the Kamchatka region, northeastern Russia: implications for development and evolution of the northwest Pacific Basin. Polarforschung, 68, 297-308
DOI: 10.1594/pangaea.527927
title: Age determination of sediment core GIK12355-1, shelf off Mauretania, West Africa (Table1)
DOI: 10.1594/pangaea.888936
title: Age determination of sediment core LAGMESAG, Laguna Mesagosa, Spain

description: This dataset was archived on 2018-04-23 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.922546
title: Carbon isotope (¹³C and ¹⁴C) composition of bulk organic carbon in surface sediments retrieved from the Pearl River Estuary and northern South China Sea Shelf

description: This data set includes sampling information, δ¹³C, F¹⁴C, C/N ratio and content of bulk OC as well as grain size data in surface sediments collected by Gray box corer or grab sampler from the Pearl River Estuary and northern South China Sea Shelf. These data could help us (1) constrain sources of OC, (2) explore the role of hydrodynamic processes for terrigenous OC transport, and (3) better understand the burial and degradation processes of terrigenous OC in the coastal tropical sea.
DOI: 10.1594/pangaea.57387
title: tab 1
DOI: 10.1594/pangaea.888951
title: Age determination of sediment core SHEHEREE, Sheheree Bog, Ireland

description: This dataset was archived on 2018-04-23 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.829724
title: (Table 1) Age determination of Barents Sea sediment cores

description: The separate roles of oceanic heat advection and orbital forcing on influencing early Holocene temperature variability in the eastern Nordic Seas is investigated. The effect of changing orbital forcing on the ocean temperatures is tested using the 1DICE model, and the 1DICE results are compared with new and previously published temperature reconstructions from a transect of five cores located underneath the pathway of Atlantic water, from the Faroe-Shetland Channel in the south to the Barents Sea in the north. The stronger early Holocene summer insolation at high northern latitudes increased the summer mixed layer temperatures, however, ocean temperatures underneath the summer mixed layer did not increase significantly. The absolute maximum in summer mixed layer temperatures occurred between 9 and 6 ka BP, representing the Holocene Thermal Maximum in the eastern Nordic Seas. In contrast, maximum in northward oceanic heat transport through the Norwegian Atlantic Current occurred approximately 10 ka BP. The maximum in oceanic heat transport at 10 ka BP occurred due to a major reorganization of the Atlantic Ocean circulation, entailing strong and deep rejuvenation of the Atlantic Meridional Overturning Circulation, combined with changes in the North Atlantic gyre dynamic causing enhanced transport of heat and salt into the Nordic Seas.
description: Supplement to: Risebrobakken, Bjørg; Dokken, Trond; Smedsrud, Lars Henrik; Andersson, Carin; Jansen, Eystein; Moros, Matthias; Ivanova, Elena V (2011): Early Holocene temperature variability in the Nordic Seas: The role of oceanic heat advection versus changes in orbital forcing. Paleoceanography, 26(4), PA4206
DOI: 10.1594/pangaea.886471
title: Age determination of sediment core LANGEAI1, Cinq-Mars-la-Pile, France

description: This dataset was archived on 2018-02-19 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.886452
title: Age determination of sediment core CHA11, Charcenay, France

description: This dataset was archived on 2018-02-19 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.886519
title: Age determination of sediment core VALDEYER, Valdeyernos bog, Spain

description: This dataset was archived on 2018-02-19 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.886460
title: Age determination of sediment core ERRANDII, Ile d'Errand, France

description: This dataset was archived on 2018-02-19 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.886462
title: Age determination of sediment core GDMEZ, Grand Mez, France

description: This dataset was archived on 2018-02-19 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.886466
title: Age determination of sediment core GYOLA, Mire Gyola, Bulgaria

description: This dataset was archived on 2018-02-19 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.783357
title: (Table 4) Radiocarbon dates for sediment core M72/5_625-1 (24-GC3)

description: 14C ages were converted into calibrated calendar ages before present, defined as AD 1950, using the Calib 6.0 radiocarbon calibration tools with the INTCAL09 calibration curve. Reservoir ages were adopted from Kwiecien et al. (2008).
DOI: 10.1594/pangaea.857834
title: Age determination of sediment core SO202-18-3
DOI: 10.1594/pangaea.885053
title: Age determination of sediment core ERDEVEN, Kerminihy beach, France

description: This dataset was archived on 2018-01-16 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.885054
title: Age determination of sediment core GRANGE1, La Grange, France

description: This dataset was archived on 2018-01-16 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.815776
title: (Table 3a) Results of isotope studies of zircons from Site UR-82/6 quartzites of the Odessa quarry, Bug area
DOI: 10.1594/pangaea.885043
title: Age determination of sediment core ARZON, Arzon, France

description: This dataset was archived on 2018-01-16 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.885049
title: Age determination of sediment core BOURBES, Marais des Bourbes, France

description: This dataset was archived on 2018-01-16 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.885051
title: Age determination of sediment core DOEL06, Doel, Belgium

description: This dataset was archived on 2018-01-16 from the EPD database (http://www.europeanpollendatabase.net).
DOI: 10.1594/pangaea.915055
title: Radiocarbon (14C) age determination on sediment core Hoefle-Mire, Northern Central Alps (Kleinwalser Valley/Kleinwalsertal, Austria)

description: The presented data consists of radiocarbon ages for a mire (Hoefle Mire) of the Kleinwalser Valley (Kleinwalsertal), Austria, in the the calcareous Northern Central Alps. The records cover approximately 6200 years and were analysed to reconstruct past mire development, landscape change, human land use, disturbance and pollution and to detect prehistoric metallurgy.
DOI: 10.1594/pangaea.833082
title: (Table 2) Age determination of sediment core MD97-2138

description: Sea surface temperature (SST) and salinity of the Western Pacific Warm Pool (WPWP) reflect global climate effects such as the El Niño-Southern Oscillation phenomenon. However, reconstructions of past changes in the WPWP from the geologic record vary depending on the specific proxy record used. Here we develop a multiproxy record of the last deglaciation from a radiocarbon-dated sediment core (MD97-2138) retrieved in the heart of the WPWP. SST reconstructions for the past 30,000 years based on planktonic foraminiferal Mg/Ca (Globigerinoides ruber and Globigerinoides sacculifer), alkenone unsaturation index, and foraminiferal transfer functions differ notably. Mg/Ca-based SST estimates from the surface dwelling species G. ruber in MD97-2138 indicate a larger surface cooling (3° ± 0.6°C) during the Last Glacial Maximum (LGM) than inferred from Mg/Ca ratios in G. sacculifer (2.3° ± 0.7°C), statistical transfer functions based on planktonic foraminiferal species assemblages, and UK37' (1°-2°C). These estimates are consistent with estimates from other WPWP cores, thereby suggesting that the discrepancy is due to proxy compatibility rather than differences in cores qualitity. Postdepositional dissolution above the lysocline might have altered the Mg/Ca-based temperature estimates in our site, but this effect is insufficient to resolve discrepancies between Mg/Ca in G. ruber and the other proxies. We suggest that the lower estimates obtained from Mg/Ca in G. sacculifer, faunal transfer functions, and Uk37' might reflect subsurface temperature changes rather than strict surface estimates. Accounting for potential artefacts, including dissolution and bioturbation, we suggest that the glacial WPWP SST was about 2.5° ± 0.7°C cooler than during the Holocene, whereas the subsurface/upper thermocline temperature change was only about 1.8° ± 0.7°C. Interpreting variations in d18OSW in terms of salinity changes suggests a possibly slight decrease in surface salinity at the site of MD97-2138 during the LGM. Though LGM freshening in MD97-2138 is not robust to postdeposition dissolution effects, this inferred freshening appears to be a general feature of the western equatorial Pacific.
description: The 14C ages were converted to calendar ages using the INTCAL98 calibration (1998) for the last 18,000 years and the polynomial fit of Bard [1998] for ages prior to the period covered by the INTCAL98 study.
description: Supplement to: de Garidel-Thoron, Thibault; Rosenthal, Yair; Beaufort, Luc; Bard, Edouard; Sonzogni, Corinne; Mix, Alan C (2007): A multiproxy assessment of the western equatorial Pacific hydrography during the last 30 kyr. Paleoceanography, 22(3), PA3204
DOI: 10.1594/pangaea.87329
title: (Table 1) Dated age of site R/V_Sadko_1937_3
DOI: 10.1594/pangaea.767574
title: Potassium and argon concentrations and age determination of ODP Site 125-782 and 125-786

description: K-Ar whole-rock ages have been obtained for 30 samples from Sites 782 and 786, Ocean Drilling Program Leg 125 in the Izu-Bonin (Ogasawara) forearc region. They form a trimodal spread of ages between 9 Ma and 44 Ma and are, with a few exceptions, consistent with the inferred lithostratigraphy. The ages have been interpreted in terms of at least two distinct episodes of magmatic and/or hydrothermal activity. A group of ten samples, including the lava flows, gave an isochron age of 41.3 ± 0.5 Ma (middle-late Eocene). This is thought to represent the age of the principal magmatic development of the volcanic forearc basement, and is comparable to published ages on equivalent rocks from other parts of the forearc basement high (e.g., the Ogasawara Islands). It may be significant that this age is slightly younger than the timing of major plate reorganization in the Western Pacific at about 43 Ma. This was followed by a minor episode of intrusive magmatism at 34.6 ± 0.7 Ma (early Oligocene) which appears to have reset the ages of some of the earlier units. This event probably corresponds to the initiation of rifting of the "proto-arc" to form the Parece Vela Basin. Boninitic samples were erupted during both episodes of magmatism, the earlier being of low-Ca boninite type and the later being of medium- and high-Ca types. It is also possible that a third episode of intrusive magmatism affected the Izu-Bonin forearc region at both Sites 782 and 786 at about 17 Ma. This would be consistent with magmatic activity elsewhere in the region during the Miocene, associated with the end of active spreading in the Parece Vela Basin and the start of arc activity in the West Mariana Ridge.
description: Supplement to: Mitchell, John G; Peate, David W; Murton, Bramley J; Pearce, Julian A; Arculus, Richard J; van der Laan, Sieger R (1992): K-Ar dating of samples from Sites 782 and 786 (Leg 125): the Izu-Bonin Forearc region. In: Fryer, P; Pearce, JA; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 125, 203-210
DOI: 10.1594/pangaea.820875
title: (Table 1) Age determination of sediment core AAS-62/2

description: Variations in the Indian summer monsoon (ISM) intensity during the last 16.7 ka have been studied using organic carbon (Corg), d15N of sedimentary organic matter, CaCO3, sediment texture, d18OC, and Mg/Ca-derived sea surface temperature, d18O of sea water and sea surface salinity, in a 14C-dated sediment core from the eastern Arabian Sea. The d18O in water and planktonic foraminifera shells off the central west coast of India may be controlled by the ISM intensity as this area receives high precipitation and land runoff. Also, the Corg and CaCO3 contents of sediments and d15N of sedimentary organic matter may be linked to ISM-induced productivity and denitrification. The results of the present study reveal that between 16 and 15.2 ka BP, the ISM was weak with minor fluctuations and started intensifying around 15.2 ka BP, at the onset of the Bølling-Ållerød (B-A) event. The B-A event is characterized by higher water column denitrification rates comparable to the present day. The ISM signatures observed in the d18OC record of B-A event compare well with those from Timta cave of the western Himalayas and also the Asian summer monsoon signatures from the Hulu caves in China and warming signatures in Greenland Ice Sheet Project 2 (GISP2) suggesting atmospheric teleconnections through Intertropical Convergence Zone. The boundary between the Younger Dryas and the Holocene is discernible with small episodes of abrupt events of increased ISM intensity. This decrease in d18OC values at ~11.8 ka BP is contemporary with June solar insolation maximum at 30° north and the increase in methane in the GISP2 ice core supporting episodes of warmer climate and increase in ISM intensity. The ISM seems to have been most stable between 7 and 5.6 ka BP. The core exhibits periodicity of 500 years that is comparable to the Atlantic water formation and the Chinese monsoon.
description: Measured on Globigerinoides ruber.
description: Supplement to: Kessarkar, Pratima Mohan; Rao, V Purnachadra; Naqvi, Syed Wajih Ahmad; Karapurkar, Supriya G (2013): Variation in the Indian summer monsoon intensity during the Bølling-Ållerød and Holocene. Paleoceanography, 28(3), 413-425
DOI: 10.1594/pangaea.907652
title: Magnetic and Beryllium chronostratigraphy of Quaternary sediment core samples of Lake Acigöl
DOI: 10.1594/pangaea.126498
title: Age and sedimentation rates of sediments from St. Anna Trough
DOI: 10.1594/pangaea.833133
title: (Table 2) Age determination of sediment core NIOP-C2_929

description: In this study we present a sea surface temperature (SST) record from the western Arabian Sea for the last 20,000 years. We produced centennial-scale d18O and Mg/Ca SST time series of core NIOP929 with focus on the glacial-interglacial transition. The western Arabian Sea is influenced by the seasonal NE and SW monsoon wind systems. Lowest SSTs occur during the SW monsoon season because of upwelling of cold water, and highest SSTs can be found in the low-productivity intermonsoon season. The Mg/Ca-based temperature record reflects the integrated SST of the SW and NE monsoon seasons. The results show a glacial-interglacial SST difference of ~2°C, which is corroborated by findings from other Arabian Sea cores. At 19 ka B.P. a yet undescribed warm event of several hundred years duration is found, which is also reflected in the d18O record. A second centennial-scale high SST/low d18O event is observed at 17 ka B.P. This event forms the onset of the stepwise yet persistent trend toward Holocene temperatures. Highest Mg/Ca-derived SSTs in the NIOP929 record occurred between 13 and 10 ka B.P. Interglacial SST is ~24°C, indicating influence of upwelling. The onset of Arabian Sea warming occurs when the North Atlantic is experiencing minimum temperatures. The rapid temperature variations at 19, 17, and 13 ka B.P. are difficult to explain with monsoon changes alone and are most likely also linked to regional hydrographic changes, such as trade wind induced variations in warm water advection.
description: Supplement to: Saher, Margot; Jung, S J A; Elderfield, Henry; Greaves, Mervyn; Kroon, Dick (2007): Sea surface temperatures of the western Arabian Sea during the last deglaciation. Paleoceanography, 22(2), PA2208
DOI: 10.1594/pangaea.413335
title: (Table 2) Age determination and stable carbon isotope values of sediment core GIK-A from Kieler Bucht, western Baltic Sea
DOI: 10.1594/pangaea.774169
title: (Table 1) Age determination of sediment core Svanic90_9004
DOI: 10.1594/pangaea.829430
title: (Table 1) Age determination of sediment core KNR166-2-26

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.
description: 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
DOI: 10.1594/pangaea.824473
title: (Table 3) Age model of sediment core GIK17675-2

description: DEPTH, sediment/rock [m] is bed base [m bsf]. AMS 14C foraminifera ages were converted to calendar years using thec alibrations of Stuiver et al. (1998) for the period 0-10 ka and Winn et al. (1991) for &gt;10 ka. The surface age gives the reservoir effect, which is assumed to be constant for each core station and has been subtracted from the calendar age to yield the sediment age.
DOI: 10.1594/pangaea.910149
title: AMS-14C ages and calibrated calendar ages of sediment core GeoB17426-3
DOI: 10.1594/pangaea.874921
title: (Table 7) Sedimentology, mineralogy and geochemistry of sediment core B997-338
DOI: 10.1594/pangaea.874934
title: (Table 10) Sedimentology, mineralogy and geochemistry of sediment core JM96-1213