cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/sbqv-my49
title: NOAA/WDS Paleoclimatology - Antarctic Ice Core Deglacial Water Isotope Data on GICC05 Timescale

description: Precise information on the relative timing of north-south climate variations is a key to resolving questions concerning the mechanisms that force and couple climate changes between the hemispheres. We present a new composite record made from five well-resolved Antarctic ice core records that robustly represents the timing of regional Antarctic climate change during the last deglaciation. Using fast variations in global methane gas concentrations as time markers, the Antarctic composite is directly compared to Greenland ice core records, allowing a detailed mapping of the inter-hemispheric sequence of climate changes. Consistent with prior studies the synchronized records show that warming (and cooling) trends in Antarctica closely match cold (and warm) periods in Greenland on millennial timescales. For the first time, we also identify a sub-millennial component to the interhemispheric coupling. Within the Antarctic Cold Reversal the strongest Antarctic cooling occurs during the pronounced northern warmth of the Bølling. Warming then resumes in Antarctica, potentially as early as the Intra-Allerød Cold Period, but with dating uncertainty that could place it as late as the onset of the Younger Dryas stadial. There is little-to-no time lag between climate transitions in Greenland and opposing changes in Antarctica. Our results lend support to fast acting inter-hemispheric coupling mechanisms, including recently proposed bipolar atmospheric teleconnections and/or rapid bipolar ocean teleconnections.
description: Stable water isotope data from five high-resolution Antarctic ice 
cores spanning the last deglaciation, methane synchronized to the 
Greenland Ice Core 2005 Chronology (GICC05), plus a composite 
(or weighted average) of the five cores. 

The five cores used in the Antarctic deglacial water isotope 
composite are: Law Dome, Byrd, EPICA Dronning Maud Land (EDML), 
Siple Dome, and Talos Dome. The data for each core is interpolated 
to 20 year time steps and standardised with respect to its own mean 
and standard deviation over the interval 9000 to 21000 years before 
1950 AD (9-21 ka BP 1950).  Estimated dating uncertainty in the 
composite (relative to GICC05) is ± 220 y during the interval 
10-13 ka BP, ± 200 y during the interval 13- 15 ka BP, 
and ± 380 y during the interval i.e. 15-18 ka BP. 
Refer to Pedro et al., (2011) (Table 2) and original references 
for dating uncertainties in the individual cores.
DOI: 10.25921/sk78-6061
title: NOAA/WDS Paleoclimatology - Lake Ximencuo, Tibet 1000 Year Multiproxy Sediment Data

description: Total organic carbon (Corg) and nitrogen (Ntot) concentrations and isotope compositions and n-alkane and n-alkan-ol molecular biomarker compositions were measured in two parallel sediment cores from Lake Ximencuo, a typical glacial lake on the eastern Qinghai-Tibetan Plateau (QTP), to reconstruct local climatic variations during the past 1000 yr. Concentrations of Corg and Ntot vary similarly with changes in precipitation recorded by tree rings in Dulan, northeastern QTP, indicating their close relation to precipitation. Carbon Preference Index (CPI) values of C22-C33n-alkanes and C22-C28n-alkan-1-ols and Average Chain Length (ACL) values of C27-C33n-alkanes generally negatively correlate with d13Corg and d15Ntot and also vary comparably with the oxygen isotope temperature record from the Dunde ice core, northeastern QTP. These patterns indicate that high CPI values and negative shifts of the d13Corg and d15Ntot correspond to warmer conditions that favor the growth of vascular land plants and that lower values and positive shifts correspond to cooler conditions in the Lake Ximencuo locality. This observation contradicts previous interpretations from peat and modern soil studies that conclude that the CPI indices were controlled by microbial degradation under different climate conditions. Here we propose that the changes of organic matter sources under different climate regimes, combined with physiological adjustments of vascular plants to different air temperatures, might yield different CPI responses to climate changes in glacial plateau lakes. Air temperature and precipitation increases and decreases reconstructed in this 1000-yr study were generally independent of each other, but they both occurred at centennial or multi-centennial scales. The interaction between subtropical (Asian Monsoon) and mid-latitude (Westerly) atmospheric circulation systems probably dominated the local precipitation variations in the Lake Ximencuo catchment, whereas solar insolation, volcanism and greenhouse gas variations were likely responsible for the air temperature changes that are recorded in the lake sediments and that are consistent with regional temperature variations in the eastern QTP.
description: Total organic carbon (Corg) and nitrogen (Ntot) concentrations and isotope compositions and n-alkane and n-alkan-ol molecular biomarker compositions were measured in two parallel sediment cores from Lake Ximencuo, a typical glacial lake on the eastern Qinghai-Tibetan Plateau (QTP), to reconstruct local climatic variations during the past 1000 yr. XimenCuo core XMC-5 data are plotted in Fig.3 and Fig.9. XimenCuo core XMC-6 data are plotted in Fig.7 and Fig.9.
DOI: 10.25921/sa7t-x240
title: NOAA/WDS Paleoclimatology - Barclay - Massive Rock - TSME - ITRDB AK090

description: Tree ring data from the International Tree Ring Data Bank and World Data Center for Paleoclimatology archives.  Most data sets include raw treering measurements (most are annual ring width, with some collections of earlywood or latewood width or wood density), plus chronologies (standardized growth indices for a site compiled from multiple treering samples). Reconstructions of climate variables are included with some of these data sets.  Each data type is stored in a separate data file; the data type is coded into the file name. For details please see: http://www.ncdc.noaa.gov/paleo/treeinfo.htmll
description: NOAA Template Chronology file added 2018-12-20. NOAA Template Raw Measurements file added 2019-02-08.
DOI: 10.15468/dl.5n9hge
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Polyplacophora)",
 "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((120 -70,130 -70,130 -60,120 -60,120 -70))"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024522-251009101135966/datasets/export for details.
DOI: 10.25921/sse5-ev65
title: NOAA/WDS Paleoclimatology - Carr - Lower Withlacoochee River - TADI - ITRDB FL007

description: Tree ring data from the International Tree Ring Data Bank and World Data Center for Paleoclimatology archives.  Most data sets include raw treering measurements (most are annual ring width, with some collections of earlywood or latewood width or wood density), plus chronologies (standardized growth indices for a site compiled from multiple treering samples). Reconstructions of climate variables are included with some of these data sets.  Each data type is stored in a separate data file; the data type is coded into the file name. For details please see: http://www.ncdc.noaa.gov/paleo/treeinfo.htmll
description: NOAA Template Chronology file added 2018-12-12. NOAA Template Raw Measurements file added 2019-01-23.
DOI: 10.25921/sah9-fk68
title: NOAA/WDS Paleoclimatology - Touchan - Leid Mohamad Ouali - CDAT - ITRDB ALGE001

description: Changes in precipitation patterns and the frequency and duration of drought are likely to be the feature of anthropogenic climate change that will have the most direct and most immediate consequences for human populations. The latest generation of state-of-the-art climate models project future widespread drying in the subtropics. Here, we reconstruct spatially-complete gridded Palmer drought severity index values back to A.D. 1179 over Morocco, Algeria, and Tunisia. The reconstructions provide long-term context for northwest African hydroclimatology, revealing large-scale regional droughts prior to the sixteenth century, as well as more heterogeneous patterns in sixteenth, eighteenth, and twentieth century. Over the most recent decades a shift toward dry conditions over the region is observed, which is consistent with general circulation model projections of greenhouse gas forced enhanced regional subtropical drought.
description: NOAA Template Chronology file added 2018-12-13. NOAA Template Raw Measurements file added 2019-05-01.
DOI: 10.5281/zenodo.17358145
title: DATASETS of Dynamic Equilibria between DNA-Stabilized Silver Nanoclusters and Silver-Carrying DNA Strands

description: Abstract: DNA-stabilized silver nanoclusters (DNA-AgNCs) are versatile emitters whose photophysical properties are defined by the DNA template. In this study, we explore the unusual temperature- and concentration-dependent behavior of two NIR-emissive DNA-AgNCs: one stabilized by two 16-base DNA oligomers (16mer), and another embedded within a 3-base shortened version of these strands (13mer). Using a combination of optical spectroscopy and mass spectrometry, we show that Ag+-carrying DNA strands can reversibly attach to DNA-AgNCs and fine-tune their photophysical properties. For 13mer-AgNC, we demonstrate the presence of three different species, (13mer)2-[Ag20]10+, (13mer)3-[Ag27]17+, and (13mer)4-[Ag34]24+, depending on concentration and temperature. For the AgNC stabilized by two 16-base DNA strands, (16mer)2-[Ag20]10+, emission wavelength and intensity vary with temperature, although no significant concentration-dependent spectral shifts are observed. While mass-spectrometry revealed the existence of (16mer)3-[Ag27]17+, time-resolved anisotropy uncovered the formation of aggregates of (16mer)2-[Ag20]10+. These findings demonstrate the presence of dynamic equilibria between Ag+-carrying DNA strands and DNA-AgNCs.
DOI: 10.5281/zenodo.17358146
title: DATASETS of Dynamic Equilibria between DNA-Stabilized Silver Nanoclusters and Silver-Carrying DNA Strands

description: Abstract: DNA-stabilized silver nanoclusters (DNA-AgNCs) are versatile emitters whose photophysical properties are defined by the DNA template. In this study, we explore the unusual temperature- and concentration-dependent behavior of two NIR-emissive DNA-AgNCs: one stabilized by two 16-base DNA oligomers (16mer), and another embedded within a 3-base shortened version of these strands (13mer). Using a combination of optical spectroscopy and mass spectrometry, we show that Ag+-carrying DNA strands can reversibly attach to DNA-AgNCs and fine-tune their photophysical properties. For 13mer-AgNC, we demonstrate the presence of three different species, (13mer)2-[Ag20]10+, (13mer)3-[Ag27]17+, and (13mer)4-[Ag34]24+, depending on concentration and temperature. For the AgNC stabilized by two 16-base DNA strands, (16mer)2-[Ag20]10+, emission wavelength and intensity vary with temperature, although no significant concentration-dependent spectral shifts are observed. While mass-spectrometry revealed the existence of (16mer)3-[Ag27]17+, time-resolved anisotropy uncovered the formation of aggregates of (16mer)2-[Ag20]10+. These findings demonstrate the presence of dynamic equilibria between Ag+-carrying DNA strands and DNA-AgNCs.
DOI: 10.25921/sgzd-n422
title: NOAA/WDS Paleoclimatology - Speer - Ellett Valley - PISP - ITRDB VA039

description: Tree ring data from the International Tree Ring Data Bank and World Data Center for Paleoclimatology archives.  Most data sets include raw treering measurements (most are annual ring width, with some collections of earlywood or latewood width or wood density), plus chronologies (standardized growth indices for a site compiled from multiple treering samples). Reconstructions of climate variables are included with some of these data sets.  Each data type is stored in a separate data file; the data type is coded into the file name. For details please see: http://www.ncdc.noaa.gov/paleo/treeinfo.htmll
description: Collected during the 2011 North American Dendroecological Fieldweek (NADEF) NOAA Template Raw Measurements file added 2019-08-22.
DOI: 10.25921/snjv-4158
title: NOAA/WDS Paleoclimatology - Meko - Harmon Canyon - PSME - ITRDB UT530

description: In western North America, snowpack has declined in recent decades, and further losses are projected through the 21st century. Here, we evaluate the uniqueness of recent declines using snowpack reconstructions from 66 tree-ring chronologies in key runoff-generating areas of the Colorado, Columbia, and Missouri River drainages. Over the past millennium, late 20th century snowpack reductions are almost unprecedented in magnitude across the northern Rocky Mountains and in their north-south synchrony across the cordillera. Both the snowpack declines and their synchrony result from unparalleled springtime warming that is due to positive reinforcement of the anthropogenic warming by decadal variability. The increasing role of warming on large-scale snowpack variability and trends foreshadows fundamental impacts on streamflow and water supplies across the western United States.
description: Purpose of Collection: Climatology - Snowpack reconstruction
#  NOAA Template Raw Measurements file added 2019-02-08.
DOI: 10.15468/dl.bjvmf9
title: Occurrence Download

description: A dataset containing 29 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Polyplacophora)",
 "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((140 -70,150 -70,150 -60,140 -60,140 -70))"
 ]
}

 The dataset includes 29 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024520-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/s22k-9p95
title: NOAA/WDS Paleoclimatology - Western Norway Lake Kråkenes and Nordic sea Sediment data

description: The Younger Dryas event, which began approximately 12,900 years ago, was a period of rapid cooling in the Northern Hemisphere, driven by large-scale reorganizations of patterns of atmospheric and oceanic circulation, Environmental changes during this period have been documented by both proxy-based reconstructions and model simulations, but there is currently no consensus on the exact mechanisms of onset, stabilization or termination of the Younger Dryas. Here we present high-resolution records from two sediment cores obtained from Lake Kråkenes in western Norway and the Nordic seas. Multiple proxies from Lake Kråkenes are indicative of rapid alternations between glacial growth and melting during the later Younger Dryas. Meanwhile, reconstructed sea surface temperature and salinity from the Nordic seas show an alternation between sea-ice cover and the influx of warm, salty North Atlantic waters. We suggest that the influx of warm water enabled the westerly wind systems to drift northward, closer to their present-day positions. The winds thus brought relatively warm maritime air to Northern Europe, resulting in rising temperatures and the melting of glaciers. Subsequent input of this fresh meltwater into the ocean spurred the formation of sea ice, which forced the westerly winds back to the south, cooling Northern Europe. We conclude that rapid alternations between these two states immediately preceded the termination of the Younger Dryas and the permanent transition to an interglacial state.
DOI: 10.25921/scdw-h580
title: NOAA/WDS Paleoclimatology - Mauntschas Mire, Switzerland 140Yr Testate Amoeba DWT Reconstruction

description: We present the first testate amoeba-based palaeohydrological reconstruction from the Swiss Alps, and the first depth to the water table (DWT) calibration dataset for this region. Compared to existing models, our new calibration dataset performs well (RMSEP=4.88), despite the length of the water table gradient covered (53 cm). The present-day topography and vegetation of the study mire Mauntschas suggest that it is partly ombrotrophic (large Sphagnum fuscum hummocks, one of which was the coring site) but mostly under the minerotrophic influence of springs in the mire and runoff from the surrounding area. Ombrotrophic Sphagnum fuscum hummocks developed at the sampling site only during the last 50 years, when testate amoebae indicate a shift towards dry and/or acid conditions. Prior to AD 1950 the water table was much higher, suggesting that the influence of the mineral-rich water prevented the development of ombrotrophic hummocks. The reconstructed DWT correlated with Pinus cembra pollen accumulation rates, suggesting that testate amoebae living on the mire and P. cembra growing outside of it partly respond to the same factor(s). Finally, temperature trends from the nearby meteorological station paralleled trends in reconstructed DWT. However, contrary to other studies made on raised bogs of northwestern Europe, the highest correlation was observed for winter temperature, despite the fact that testate amoebae would more logically respond to moisture conditions during the growing season. The observed correlation with winter temperature might reflect a control of winter severity on surface moisture during at least the first part of the growing season, through snow melt and soil frost phenomena influencing run-off. More ecohydrological work on subalpine mires is needed to understand the relationships between climate, testate amoebae and peatland development.
description: Depth to Water Table (DWT) reconstruction for Mauntschas mire in the Swiss Alps.  All calculations are based on percentage of each species of Testate Amoeba in a sample (See Booth 
et al., 2010).  Age model is from Goslar et al. (2009). 

Depth to Water Table (DWT) is dependent on vegetation season temperature and summer water deficit, providing a mixed 
temperature and precipitation signal. 

Mauntschas is a Sphagnum mire located near St. Moritz in the Upper Engadin valley, southeastern Swiss Alps, ~10 ha in size.
DOI: 10.25921/sbv2-9s51
title: NOAA/WDS Paleoclimatology - Portuguese Margin MIS6 foraminiferal isotope and palynology data

description: During the last glacial period, iceberg discharges into the North Atlantic disrupted the meridional overturning circulation, leading to cooling in the Northern Hemisphere and warming in Antarctica. This asymmetric response can be explained by a bipolar see-saw mechanism, whereby changes in the strength of the meridional overturning circulation lead to changes in the interhemispheric heat transport. It is unclear, however, to what extent the response of the overturning circulation is a function of freshwater flux and boundary climate conditions. Here we use foraminiferal isotope and pollen records from the Portuguese margin to reconstruct surface- and deep-water hydrography and atmospheric changes during the last and penultimate glacial periods. When we compare our records with temperature reconstructions from Antarctica, we find that the bipolar see-saw was a characteristic feature of both glacial periods. However, the comparison also underlines the dependence of the bipolar see-saw on background climate and magnitude of iceberg discharge. It also suggests that an intensified hydrological cycle may lead to a weaker overturning circulation with a smaller disruption threshold and extended North Atlantic stadial durations.
description: The following benthic species were analysed, and adjusted as indicated: Cibicidoides sp.: +0.51; Uvigerina peregrina and similar specimens: 0.0; Globobulimina affinis: -0.4; Cibicidoides wuellerstorfi, +0.64; Globocassidulina sp.: -0.1; Hoeglundina elegans: -0.7. MD01-2444 MIS3 isotope and faunal data in Vautravers and Shackleton, 2006.
DOI: 10.25921/spg8-hx29
title: NOAA/WDS Paleoclimatology - Langton et al. 2008 Kau Bay, Indonesia 3500-Year d15N ENSO Record

description: We use geochemical data from a sediment core in the shallow-silled and intermittently dysoxic Kau Bay in Halmahera (Indonesia, lat 1°N, long 127.5°E) to reconstruct century-scale climate variability within the Western Pacific Warm Pool over the past ~3500 yr. Downcore variations in bulk sedimentary δ15N appear to reflect century-scale variability in basin ventilation, attributed to changes in oceanographic conditions related to century-scale fluctuations in El Niño Southern Oscillation (ENSO). We infer an increase in century-scale El Niño activity beginning ca. 1700 yr B.P. with peaks in El Niño activity ca. 1500 yr B.P., 1150 yr B.P., and ca. 700 yr B.P. The Kau Bay results suggest that there was diminished ENSO amplitude or frequency, or a departure from El Niño–like conditions during the Medieval Warm Period, and distinctive, but steadily decreasing, El Niño activity during and after the Little Ice Age.
DOI: 10.25921/sxps-jm23
title: NOAA/WDS Paleoclimatology - Kuettel et al. 2009 N. Atlantic/Europe SLP Reconstructions

description: Local to regional climate anomalies are to a large extent determined by the state of the atmospheric circulation. The knowledge of large-scale sea level pressure (SLP) variations in former times is therefore crucial when addressing past climate changes across Europe and the Mediterranean. However, currently available SLP reconstructions lack data from the ocean, particularly in the pre-1850 period. Here we present a new statistically-derived 5° × 5° resolved gridded seasonal SLP dataset covering the eastern North Atlantic, Europe and the Mediterranean area (40°W–50°E; 20°N–70°N) back to 1750 using terrestrial instrumental pressure series and marine wind information from ship logbooks. For the period 1750–1850, the new SLP reconstruction provides a more accurate representation of the strength of the winter westerlies as well as the location and variability of the Azores High than currently available multiproxy pressure field reconstructions. These findings strongly support the potential of ship logbooks as an important source to determine past circulation variations especially for the pre-1850 period. This new dataset can be further used for dynamical studies relating large-scale atmospheric circulation to temperature and precipitation variability over the Mediterranean and Eurasia, for the comparison with outputs from GCMs as well as for detection and attribution studies.
DOI: 10.25380/iastate.30210160
title: Data for Charge density wave in intermetallic oxides R5Pb3O (R = La and Ce)

description: This dataset contains tabular data, CIF, hkl, ins files, and raw instrumental data associated with the figures in the paper "Charge density wave in intermetallic oxides R5Pb3O (R = La and Ce)". In the manuscript, we report single crystal growth and basic characterization for the La and Ce members of this family. At room temperature, these compounds adopt a tetragonal structure (I4/mcm), where R and Pb atoms form linear chains along the c-axis. We identify a second-order structural phase transition at 260 K and 145 K for R = La and Ce, respectively. Single crystal X-ray diffraction reveals a lattice modulation below the transition temperature, resulting in R-Pb pairs in the z direction. The broken symmetry in the low-temperature phases results in a primitive structure with space group P4/ncc. Transport and diffraction measurements, in agreement with density functional theory calculations, support that the R5Pb3O (R = La and Ce) series hosts an electron-phonon coupling driven charge density wave (CDW) at low temperatures.