cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/97wv-5p13
title: NOAA/WDS Paleoclimatology - Bermuda Rise High Resolution 60-25KYrBP Uranium Series Data

description: The most recent ice age was characterized by rapid and hemispherically asynchronous climate oscillations, whose origin remains unresolved. Variations in oceanic meridional heat transport may contribute to these repeated climate changes, which were most pronounced during marine isotope stage 3, the glacial interval 25 thousand to 60 thousand years ago. We examined climate and ocean circulation proxies throughout this interval at high resolution in a deep North Atlantic sediment core, combining the kinematic tracer protactinium/thorium (Pa/Th) with the deep water-mass tracer, epibenthic d13C. These indicators suggest reduced Atlantic overturning circulation during every cool northern stadial, with the greatest reductions during episodic Hudson Strait iceberg discharges, while sharp northern warming followed reinvigorated overturning. These results provide direct evidence for the ocean's persistent, central role in abrupt glacial climate change.
description: Pa/Th, carbonate, and stable isotope data collected from bulk sediment in Bermuda Rise sediment core KNR191 CDH19 covering 60-25 ka
DOI: 10.25921/9mkd-5r03
title: NOAA/WDS Paleoclimatology - Deep Sea Coral Global Boron Isotope Data

description: The boron isotope ratio (d11B) of foraminifers and tropical corals has been proposed to record seawater pH. To test the veracity and practicality of this potential paleo-pH proxy in deep sea corals, samples of skeletal material from twelve archived modern Desmophyllum dianthus (D. dianthus) corals from a depth range of 274-1470 m in the Atlantic, Pacific, and Southern Oceans, ambient pH range 7.57-8.05, were analyzed for d11B. The d11B values for these corals, spanning a range from 23.56 to 27.88, are found to be related to seawater borate d11B by the linear regression: d11Bcoral=(0.76+/-0.28) d11Bborate+(14.67+/-4.19) (1 standard error (SE)). The D. dianthus d11B values are greater than those measured in tropical corals, and suggest substantial physiological modification of pH in the calcifying space by a value that is an inverse function of seawater pH. This mechanism partially compensates for the range of ocean pH and aragonite saturation at which this species grows, enhancing aragonite precipitation and suggesting an adaptation mechanism to low pH environments in intermediate and deep waters. Consistent with the findings of Trotter et al. (2011) for tropical surface corals, the data suggest an inverse correlation between the magnitude of a biologically driven pH offset recorded in the coral skeleton, and the seawater pH, described by the equation: DpH=pH recorded by coral-seawater pH=-(0.75+/-0.12) pHw+(6.88+/-0.93) (1 SE). Error analysis based on 95% confidence interval(CI) and the standard deviation of the regression residuals suggests that the uncertainty of seawater pH reconstructed from d11Bcoral is +/-0.07 to 0.12 pH units. This study demonstrates the applicability of d11B in D. dianthus to record ambient seawater pH and holds promise for reconstructing oceanic pH distribution and history using fossil corals.
description: Calibration of boron isotopes in the deep-sea coral Desmophyllum dianthus. Provided Keywords: coral, deep-sea coral, trace metals, proxy, calibration, paleoceanography
DOI: 10.25921/98vm-px04
title: NOAA/WDS Paleoclimatology - Yocom fire data from Puerto el Tarilla,l Sierra Madre Oriental, Coahuila, Mexico - IMPD MXPU-001

description: We investigated the influence of broad- v. fine-scale factors on fire in an unusual landscape suitable for distinguishing the drivers of fire synchrony. Our study was conducted in the Sierra Madre Oriental mountain range, in north-eastern Mexico. We worked in nine sites on three parallel mountains that receive nearly identical broad-scale climatic influence, but between which fires are unlikely to spread. We collected and cross dated samples from 357 fire-scarred trees in nine sites in high-elevation mixed-conifer forests and identified fire dates. We used Jaccard similarity analysis to evaluate synchrony among sites and quantified relationships between climate and fire occurrence. Fires were historically frequent (mean fire interval ranged from 8 to 16 years in all sites) and dates of fire exclusion ranged from 1887 to 1962. We found low fire synchrony among the three mountains, indicating a strong influence of fine-scale factors on fire occurrence. Fire regime attributes were similar across mountains despite the independence of fire dates. La Niña events were associated with fire over time, although not significantly since the 1830s. Our results highlight the importance of scale in describing fire regimes and suggest that we can use fire history to understand controls on complex ecosystem processes and patterns.
description: This site was sampled as part of a project to reconstruct historical fire regimes in northeastern Mexico. Ring-boundary fire scars were assigned to the subsequent calendar year.

Fire History Graphs: Fire History Graphs illustrate specific years when fires occurred and how many trees were scarred. They are available in both PDF and PNG formats. The graphs consist of 2 parts, both of which show the X axis (time line) at the bottom with the earliest year of information on the left and the latest on the right. The Fire Index Plot is the topmost plot, and shows two variables: sample depth (the number of recording trees in each year) as a blue line along the left Y axis, compared with the percent trees scarred shown as gray bars along the right Y axis. Below, the Fire Chronology Plot consists of horizontal lines representing injuries by year on individual sampled trees. Symbols are overlain that denote the years containing the dendrochronologically-dated fire scars or injuries. The sample ID of each tree is displayed to the right of each line. The Composite Axis below represents the composite information from all individual series. The symbols used to represent the fire scars or injuries, and the filters used to determine the composite information, are shown in the legend. These graphs were created using the Fire History Analysis and Exploration System (FHAES). See http://www.fhaes.org for more information.
DOI: 10.15468/dl.5pkt5m
title: Occurrence Download

description: A dataset containing 101 species occurrences available in GBIF matching the query:
{
 "and" : [
 "DatasetKey is one of (Museum of Comparative Zoology, Harvard University, KUBI Mammalogy Collection, University of Michigan Museum of Zoology, Division of Mammals, Field Museum of Natural History (Zoology) Mammal Collection, MSB Mammal Collection (Arctos), Washington State University, Charles R. Conner Museum Mammal Specimens (Arctos))",
 "Geometry POLYGON((-85.51009 24.20827,-78.58957 25.1966,-78.58957 31.12698,-88.19277 31.14655,-87.24769 28.48589,-85.51009 24.20827))",
 "HasGeospatialIssue is false",
 "TaxonKey is Spilogale putorius"
 ]
}

 The dataset includes 101 records from 6 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025182-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/96qq-h584
title: NOAA/WDS Paleoclimatology - Umbanhowar fire data from Rice Lake, North Dakota - IMPD USRLN001

description: The relationship of fire and climate in explaining the origin and maintenance of the grasslands of the northern Great Plains has long been of interest. I examined the hypothesis that burning was more frequent during wet years using charcoal to reconstruct fire histories near Coldwater Lake in southcentral ND, and Rice Lake in northcentral ND and published records of ostracod Mg/Ca ratios as a proxy for climate at these same two sites. Over the past 10 000 years, charcoal influx rates for Coldwater (0.04-5.68 mm2/cm2/year) greatly exceeded influx rates for Rice (<0.01-1.91 mm2/cm2/year). Both sites showed strong, significant periodicities of ~1500-1800, ~800-900 and ~130-140 years but charcoal maxima and minima were only similar at ~4200 cal years BP. Charcoal influx during the past 2000 years also revealed strong periodicities of between 310-400 and 140 years at both sites. Comparison of smoothed charcoal influxes and ostracod Mg/Ca ratios suggests that both proxies are responding to changes in climate. When smoothed with a 320-400-year window, increases in charcoal influx typically preceded rises in ostracod Mg/Ca ratio by ~50-100 years, and further smoothing (140-year window) of the residuals suggested a variable relationship between Mg/Ca ratios and charcoal influx. These results do not clearly support or reject the fuel limitation hypothesis, and this lack of clear support may result from (a) climate-driven shifts in the mix of C3 and C4 grasses resulting in maximum productivity at intermediate moisture levels, (b) possibly different responses of charcoal and Mg/Ca ratios to summer vs. winter precipitation, or (c) ground-water driven lags in the response of Mg/Ca ratios to shifts in climate. Comparison of the results from this study with other studies suggests that links between fire and fuels at finer time scales (0-100 years) may be broadly constrained by longer term (~500-2000 years) patterns of climate in the northern Great Plains.
DOI: 10.6084/m9.figshare.30350626
title: Geometrical and Topological Data of Grains and its Neighbours in Polycrystalline System RSPA-2025-0889

description: Curvature-driven microstructural changes is simulated using thermodynamically-consistent multiphase-field model. In order to understand the evolution of individual entities (grains/foams) during this isotropic evolution, the geometrical and topological data of the evolving unit along with its neighbour, at every timestep, is gathered and shared here.
DOI: 10.34740/kaggle/ds/8473630
title: Amazon Catalog Price Dataset
DOI: 10.6084/m9.figshare.30350626.v1
title: Geometrical and Topological Data of Grains and its Neighbours in Polycrystalline System RSPA-2025-0889

description: Curvature-driven microstructural changes is simulated using thermodynamically-consistent multiphase-field model. In order to understand the evolution of individual entities (grains/foams) during this isotropic evolution, the geometrical and topological data of the evolving unit along with its neighbour, at every timestep, is gathered and shared here.
DOI: 10.6084/m9.figshare.30350626.v2
title: Geometrical and Topological Data of Grains and its Neighbours in Polycrystalline System RSPA-2025-0889

description: Curvature-driven microstructural changes is simulated using thermodynamically-consistent multiphase-field model. In order to understand the evolution of individual entities (grains/foams) during this isotropic evolution, the geometrical and topological data of the evolving unit along with its neighbour, at every timestep, is gathered and shared here.
DOI: 10.25921/9v8e-7d29
title: NOAA/WDS Paleoclimatology - Umbanhowar Fire Data from Eagle Lake, Eastern North America (Paleon) - IMPD USEGL001

description: Records of past fire occurrence from tree rings, charcoal found in lake sediments, and other proxies. Parameter keywords describe what was measured in this data set.  Additional summary information can be found in the abstracts of papers listed in the data set citations.  Additional information on the International Multiproxy Database (IMPD) data set procedures are also available.

description: Provided Keywords: fire, paleoclimate, climate, charcoal
DOI: 10.15468/dl.6d2879
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Coliiformes)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1980",
 "OccurrenceStatus is Present",
 {
 "not" : {
 "BasisOfRecord" : [
 "is one of (Fossil, Living Specimen)"
 ]
 }
 },
 "Geometry POLYGON((30 -80,40 -80,40 -70,30 -70,30 -80))"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025181-251009101135966/datasets/export for details.
DOI: 10.25921/9cjq-3q26
title: NOAA/WDS Paleoclimatology - Paleo-pCO2 Database 60 Million Year Boron Isotope and CO2 Data

description: Knowledge of the evolution of atmospheric carbon dioxide concentrations throughout the Earth's history is important for a reconstruction of the links between climate and radiative forcing of the Earth's surface temperatures. Although atmospheric carbon dioxide concentrations in the early Cenozoic era (about 60 Myr ago) are widely believed to have been higher than at present, there is disagreement regarding the exact carbon dioxide levels, the timing of the decline and the mechanisms that are most important for the control of CO2 concentrations over geological timescales. Here we use the boron-isotope ratios of ancient planktonic foraminifer shells to estimate the pH of surface-layer sea water throughout the past 60 million years, which can be used to reconstruct atmospheric CO2 concentrations. We estimate CO2 concentrations of more than 2,000 p.p.m. for the late Palaeocene and earliest Eocene periods (from about 60 to 52 Myr ago), and find an erratic decline between 55 and 40 Myr ago that may have been caused by reduced CO2 outgassing from ocean ridges, volcanoes and metamorphic belts and increased carbon burial. Since the early Miocene (about 24 Myr ago), atmospheric CO2 concentrations appear to have remained below 500 p.p.m. and were more stable than before, although transient intervals of CO2 reduction may have occurred during periods of rapid cooling approximately 15 and 3 Myr ago.
description: Paleo-CO2 derived from boron isotope measurements on planktonic foraminifera in western Pacific sediment samples from Ocean Drilling Program Sites 865, 871 and 872 for the past 60 million years, contributed to the Paleo-pCO2 Database.
DOI: 10.25921/9886-bg13
title: NOAA/WDS Paleoclimatology - Dome Fuji 720 kyr Stable Isotope Data and Site and Source Temperature Reconstructions

description: The dD temperature proxy in Antarctic ice cores varies in parallel with CO2 through glacial cycles. However, these variables display a puzzling asynchrony. Well-dated records of Southern Ocean temperature will provide crucial information because the Southern Ocean is likely key in regulating CO2 variations. Here, we perform multiple isotopic analyses on an Antarctic ice core and estimate temperature variations at this site and in the oceanic moisture source over the past 720,000 years, which extend the longest records by 300,000 years. Antarctic temperature is affected by large variations in local insolation that are induced by obliquity. At the obliquity periodicity, the Antarctic and ocean temperatures lag annual mean insolation. Further, the magnitude of the phase lag is minimal during low eccentricity periods, suggesting that secular changes in the global carbon cycle and the ocean circulation modulate the phase relationship among temperatures, CO2 and insolation in the obliquity frequency band.
description: Stable isotope (dD, d18O) data and site and source temperature reconstructions from the Dome Fuji 1st and 2nd ice cores for the past 720 kyr.
DOI: 10.25921/9xvx-q584
title: NOAA/WDS Paleoclimatology - González-Cásares - DUPC - PIEN - ITRDB MEXI114

description: Climate warming could intensify drought stress in NW Mexico mountains as the Sierra Madre Occidental which are not only centers of pine diversification but also subject to a high hydroclimatic variability. In this region, rainfall and thus forest growth depend on changes in sea-surface temperatures (SST) across the equatorial Pacific related to the El Nino Southern Oscillation (ENSO). Winter moist-cool conditions usually correspond to El Nino episodes characterized by warm SSTs in the equatorial Pacific, whilst dry winters correspond to cold SSTs (La Nina). Consequently, growth responsiveness to dry spells could be used as a proxy of forest vulnerability to increased drought stress. Here, we characterize the growth responsiveness of five coexisting Mexican pine species to hydroclimate, drought, and the ENSO using dendrochronology. Pinus lumholtzii and P. durangensis showed a low responsiveness to maximum temperatures and drought, whereas others as P. arizonica, P. engelmannii, and P. leiophylla were very responsive. Among these drought-sensitive pine species, we found responses to ca. half- (e.g. P. engelmannii) and 1-year long (e.g. P. arizonica) droughts. The most responsive species to drought, P. arizonica and P. leiophylla, were also those showing a higher association between ENSO-related indices and growth. Wet and cool winter and spring conditions, linked to warm SSTs over the equatorial Pacific, were the main hydroclimate factors enhancing growth. Pine species presented different growth responsiveness to drought which suggests that they present diverse tolerances to water shortage. This implies that coexisting pine species will differently face the more arid conditions forecasted for many drought-prone areas.
description: NOAA Template Raw Measurements file added 2019-01-25. NOAA Template Raw Measurements file added 2019-02-04.
DOI: 10.25921/9rd1-cb45
title: NOAA/WDS Paleoclimatology - WAIS Divide 67-6ka nssS Data and EDML, EDC and TALDICE Volcanic Tie Points

description: The mid-latitude westerly winds of the Southern Hemisphere play a central role in the global climate system via Southern Ocean upwelling, carbon exchange with the deep ocean, Agulhas leakage (transport of Indian Ocean waters into the Atlantic) and possibly Antarctic ice-sheet stability. Meridional shifts of the Southern Hemisphere westerly winds have been hypothesized to occur in parallel with the well-documented shifts of the intertropical convergence zone in response to Dansgaard-Oeschger (DO) events- abrupt North Atlantic climate change events of the last ice age. Shifting moisture pathways to West Antarctica are consistent with this view but may represent a Pacific teleconnection pattern forced from the tropics. The full response of the Southern Hemisphere atmospheric circulation to the DO cycle and its impact on Antarctic temperature remain unclear. Here we use five ice cores synchronized via volcanic markers to show that the Antarctic temperature response to the DO cycle can be understood as the superposition of two modes: a spatially homogeneous oceanic 'bipolar seesaw' mode that lags behind Northern Hemisphere climate by about 200 years, and a spatially heterogeneous atmospheric mode that is synchronous with abrupt events in the Northern Hemisphere. Temperature anomalies of the atmospheric mode are similar to those associated with present-day Southern Annular Mode variability, rather than the Pacific-South American pattern. Moreover, deuterium-excess records suggest a zonally coherent migration of the Southern Hemisphere westerly winds over all ocean basins in phase with Northern Hemisphere climate. Our work provides a simple conceptual framework for understanding circum-Antarctic temperature variations forced by abrupt Northern Hemisphere climate change. We provide observational evidence of abrupt shifts in the Southern Hemisphere westerly winds, which have previously documented ramifications for global ocean circulation and atmospheric carbon dioxide. These coupled changes highlight the necessity of a global, rather than a purely North Atlantic, perspective on the DO cycle.
description: Non-sea salt Sulfate (nssS) data for the WAIS Divide ice core, plus volcanic tie points to Antarctic ice cores EPICA Dronning Maud Land, EPICA Dome C, and Talos Dome.
DOI: 10.25921/9cvk-zp27
title: NOAA/WDS Paleoclimatology - Global 2,000 Year Paleo Hydrodynamics Data Assimilation product (PHYDA)

description: Hydroclimate extremes critically affect human and natural systems, but there remain many unanswered questions about their causes and how to interpret their dynamics in the past and in climate change projections. These uncertainties are due, in part, to the lack of long-term, spatially resolved hydroclimate reconstructions and information on the underlying physical drivers for many regions. Here we present the first global reconstructions of hydroclimate and associated climate dynamical variables over the past two thousand years. We use a data assimilation approach tailored to reconstruct hydroclimate that optimally combines 2,978 paleoclimate proxy-data time series with the physical constraints of an atmosphere-ocean climate model. The global reconstructions are annually or seasonally resolved and include two spatiotemporal drought indices, near-surface air temperature, an index of North Atlantic variability, the location of the intertropical convergence zone, and monthly Nino indices. This database, called the Paleo Hydrodynamics Data Assimilation product (PHYDA), will provide a critical new platform for investigating the causes of past climate variability and extremes, while informing interpretations of future hydroclimate projections.
description: Paleohydrodynamic proxy data set and global hydroclimate reconstructions for the past 2,000 years. Included are reconstructions of three global variables gridded at ~2 degree resolution: surface temperature at 2m, the Palmer drought severity index (PDSI), and the standardized precipitation evapotranspiration index (SPEI).  Also reconstructed are climate indices at annual, JJA, and DJF temporal resolutions: the global mean temperature, the North Atlantic sea surface temperature index (which is the non-detrended and non-smoothed version of the Atlantic multidecadal oscillation index (AMO), and the location of the intertropical convergence zone (ITCZ) in 11 longitudinal zones. Also reconstructed are the monthly Nino sea surface temperature (SST) indices (Nino 1+2, 3, 3.4, 4) and the monthly equatorial Pacific zonal SST gradient.
DOI: 10.25921/9s77-rf89
title: NOAA/WDS Paleoclimatology - Ras Umm Sidd 245 Year Coral d18O, Sr/Ca, SST and d18Osw Data

description: The climate of the Sahara and Arabian Deserts during the Little Ice Age is not well known, due to a lack of annually resolved natural and documentary archives. We present an annual reconstruction of temperature and aridity derived from Sr/Ca and oxygen isotopes in a coral of the desert-surrounded northern Red Sea. Our data indicate that the eastern Sahara and Arabian Deserts did not experience pronounced cooling during the late Little Ice Age (~1750-1850) but suggest an even more arid mean climate than in the following ~150 years. The mild temperatures are broadly in line with predominantly negative phases of the North Atlantic Oscillation during the Little Ice Age. The more arid climate is best explained by meridional advection of dry continental air from Eurasia. We find evidence for an abrupt termination of the more arid climate after 1850, coincident with a reorganization of the atmospheric circulation over Europe.
description: Coral oxygen isotope (d18O) and strontium/calcium data and reconstructed sea surface temperature and d18Oseawater from northern Red Sea coral RUS-95 collected off Ras Umm Sidd, Egypt, for the past 245 years.  Data are presented at both annual and bimonthly resolution.