cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/8j9b-3q12
title: NOAA/WDS Paleoclimatology - O'Connor fire data from Pinalenos_L21, Southeast Arizona - IMPD USL21001

description: In recent decades fire size and severity have been increasing in high elevation forests of the American Southwest. Ecological outcomes of these increases are difficult to gauge without an historical context for the role of fire in these systems prior to interruption by Euro-American land uses. Across the gradient of forest types in the Pinaleño Mountains, a Sky Island system in southeast Arizona that experienced two relatively large high-severity fires in the last two decades, we compared fire characteristics and climate associations before and after the onset of fire exclusion to determine the degree of similarity between past and recent fires. We use a gridded fire scar and demography sampling network to reconstruct spatially explicit estimates of fire extent and burn severity, as well as climate associations of fires from individual site to landscape scales from 1640 to 2008 C.E. We found that patterns of fire frequency, size, and severity were relatively stable for at least several centuries prior to 1880. A combination of livestock grazing and active fire suppression after circa 1880 led to (1) a significant reduction in fire spread but not fire ignition, (2) a conversion of more than 80% of the landscape from a frequent, low to mixed-severity fire regime to an infrequent mixed to high-severity fire regime, and (3) an increase in fuel continuity within a mid-elevation zone of dry mixed-conifer forest, resulting in increased opportunities for surface and crown fire spread into higher elevation mesic forests. The two most recent fires affecting mesic forests were associated with drought and temperature conditions that were not exceptional in the historical record but that resulted in a relative proportion of high burn severity up to four times that of previous large fires. The ecological effects of these recent fires appear to be more severe than any fire in the reconstructed period, casting uncertainty upon the recovery of historical species composition in high-severity burn patches. Significant changes to the spatial pattern, frequency, and climate associations of spreading fires after 1880 suggest that limits to fuel loading and fuel connectivity sustained by frequent fire have been removed. Coinciding factors of high fuel continuity and fuel loading, projected lengthening of the fire season, and increased variability in seasonal precipitation suggest that large high-severity fires, especially in mixed-conifer forests, will become the predominant fire type without aggressive actions to reduce fuel continuity and restore fire-resilient forest structure and species composition.
description: This dataset was contributed as part of the North American Tree-ring Fire Scar Synthesis (NAFSS) project (https://www.ncei.noaa.gov/access/paleo-search/study/34853). Data were contributed to the project from the original data generators.
DOI: 10.25921/88jz-h722
title: NOAA/WDS Paleoclimatology - Mediterranean Sea, sea surface (SST) and deep water temperature (DWT) reconstructions based on Mg/Ca ratios and d18O data over the past 15 kyrs

description: Deglacial and Holocene climate changes in the Mediterranean region altered the circulation dynamics, modifying the properties of the Eastern Mediterranean Sourced Waters (EMSW). EMSW flow into the Western Mediterranean and eventually into the North Atlantic Ocean through the Mediterranean outflow water (MOW). This study investigates the physicochemical changes in the EMSW properties during the Younger Dryas (YD; 12.9–11.65 kyr) and the youngest Sapropel (S1; 10.6–6.1 kyr), when major changes occurred in the Mediterranean circulation. We investigate these changes using stable oxygen isotopes (δ18O) and Mg/Ca in benthic and planktonic foraminifera from a sediment core located at the western flank of the Sicily channel (W-Sicily). Our data indicate a salinity enrichment of the EMSW during the late YD in consonance with a salinity increase in the MOW. This scenario would have represented a salinity injection into the Atlantic Ocean when the Atlantic meridional overturning circulation was weak. During the first part of the S1 (S1a), a decrease in salinity at the W-Sicily coincides with a reduced EMSW outflow, being consistent with an important reduction of the salinity and intensity of the MOW. At the last phase of the S1 (S1b), we detect for the first time, a significant change in both surface and deep hydrology of the Tyrrhenian Sea. We propose that increased evaporation in the basin led to higher salinity in the surface water layers favoring winter/spring vertical water mixing. This episode would have favored convection processes over the Tyrrhenian Sea leading to the formation of a higher-salinity intermediate-water mass.
description: Here we present new data of sea surface (SST) and deep water temperature (DWT) based on Mg/Ca ratios and oxygen stable isotopes records (δ18O). Using the temperatures and the oxygen isotopes we estimate variations in the salinity of the sea surface and deep waters. These data were obtained from a gravity core NDT-6-2016 collected at the west flank of Sicily channel (38°0'26,60''N and 11°47'44,84''E) during the Next Data expedition (CNR-URANIA R/V, 2016). The recovered core is located at 1066 m of water depth, the present-day boundary layer between WMDW and EMSW
DOI: 10.25921/84n6-5r72
title: NOAA/WDS Paleoclimatology - Ferrari - Bosch Tens, Val Bregaglia - ABAL - ITRDB CHE466

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: Elevation range: 1294 - 1327 m a.s.l.
DOI: 10.25921/8gha-b913
title: NOAA/WDS Paleoclimatology - Scherrer - Sot Plan dal Piz, Engiadina Bassa - ABAL - ITRDB CHE480

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
DOI: 10.13140/rg.2.2.28801.04968
title: Caratteristiche metrologiche MPD da 100N a 10 kN COOPBIL 171711
DOI: 10.25921/8kg5-br88
title: NOAA/WDS Paleoclimatology - Swetnam fire data from Ward Canyon Pine - IMPD USWCP002

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: This dataset was contributed as part of the North American Tree-ring Fire Scar Synthesis (NAFSS) project (https://www.ncei.noaa.gov/access/paleo-search/study/34853). Data were contributed to the project from the original data generators.
DOI: 10.25921/83aj-3h93
title: NOAA/WDS Paleoclimatology - Xibalba Cave Geochemical Data from 250 to -57 Cal Yr BP

description: Approximately half of the world's population lives in the tropics, and future changes in the hydrological cycle will impact not just the freshwater supplies but also energy production in areas dependent upon hydroelectric power. It is vital that we understand the mechanisms/processes that affect tropical precipitation and the eventual surface hydrological response to better assess projected future regional precipitation trends and variability. Paleo-climate proxies are well suited for this purpose as they provide long time series that pre-date and complement the present, often short instrumental observations. Here we present paleo-precipitation data from a speleothem located in Mesoamerica that reveal large multi-decadal declines in regional precipitation, whose onset coincides with clusters of large volcanic eruptions during the nineteenth and twentieth centuries. This reconstruction provides new independent evidence of long-lasting volcanic effects on climate and elucidates key aspects of the causal chain of physical processes determining the tropical climate response to global radiative forcing.
description: Data contributed as part of SISAL v3 Global Speleothem Isotope and Trace Element Database (https://doi.org/10.25921/jajq-qg60). Notes from the SISAL database: Although Publication supplied precision of d18O as 0.06 permil, this has been entered as 0.07 permil for both d13C and d18O as following Breitenbach and Bernasconi (2011) (DOI: 10.1002/rcm.5052). Decay constants could either be Cheng et al. 2000 or Cheng et al. 2013. The age model for the speleothem is based on a parabolic curve fit to the 230Th dates and the collection date. There are 15 repeated interp_age which were adjusted by 0.0001.
DOI: 10.25921/8n9c-4m97
title: NOAA/WDS Paleoclimatology - DeSoto Caverns Geochemical Data from 4200 to -58 Cal Yr BP

description: A newly acquired, absolute U/Th dated, δ18O record archived in a stalagmite from DeSoto Caverns in Alabama renders highly resolved time series for the past four millennia. Two principal states of variability are discerned in the δ18O record: (1) stable state spanning the intervals before Common Era 2350 to A.D. 400 and A.D. 1700 to 2008 that exhibits significant periodicities of 30 and 60 years and (2) unstable state in between containing six major discontinuities alternating with rapid δ18O positive excursions. The two contrasting states are likely the manifestations of extreme rainfall events established on the basis of the imprints of anomalously high/low drip flow rates discerned in the fabrics of the discontinuities. The proxy rainfall record offers valuable insights on whether climate variability may have been implicated in the rise and demise of the Mississippian chiefdoms (A.D. 800 to 1700) in the southeastern United States. The time of emergence and growth of the Mississippian chiefdoms and their subsistence transition to a dependency on corn, a warm and wet weather crop, coincides with a period of increased rainfall over the A.D. 450–1000 interval. Overall decline in rainfall between A.D. 1000 and 1500, alternating with droughts, is contemporaneous with evidence of abandonment of towns and villages and downstream movement of populations. Thus, warmer, wetter conditions than present may have promoted corn agriculture during the rise and growth of the chiefdoms, whereas food shortages, caused by failed corn crops under drought conditions, may have played a much greater role in the demise of the Mississippian chiefdoms than previously recognized.
description: Data contributed as part of SISAL v3 Global Speleothem Isotope and Trace Element Database (https://doi.org/10.25921/jajq-qg60). Notes from the SISAL database: DSSG-4 (SISAL entity_id = 112): U-series data only appear in graphic form in the original publication (Aharon et al.2012) not tabular so they are not included here. Cover thickness are from Aharon et al 2010 GCA paper. d18O and d13C precision are from Aharon et al 2017 QSR paper for the Alabama lab.
DOI: 10.25921/8k3h-6k71
title: NOAA/WDS Paleoclimatology - Muna Composite d18O Record from 1668-2005 CE

description: We present an annual resolution oxygen isotope anomaly record (Dd18Oc ) record, derived from eight teak (Tectona grandis L.f.) tree ring-dated d18Oc records from Muna, Southeast Sulawesi, Indonesia (5.3?S, 123?E), to investigate the response of El Nino-Southern Oscillation (ENSO) to external radiative forcings (ERF), 1668-2005. The record is significantly correlated (r = 0.41, edf=82, p < 0.001) with the Oct-Sep averaged Nino3.4 SST index for the period 1856-2005, confirming prior results from proxy system (forward) isotopic modeling of the ?d18Oc record as an ENSO indicator. We examined the response of the Dd18Oc record response to established greenhouse gas, volcanic and solar radiative forcing. For the volcanic forcing, we find a significant composite tendency towards ENSO warm phase events in the year following volcanic eruptions, n=29 events, p=0.05. We found no statistically significant changes arising from solar activity, 1751-2005, nor a change in ENSO event distribution, 1681-2005. The latter result suggests either a weak response in ENSO behavior despite known and substantial changes in well-mixed greenhouse gas forcing over the past three centuries, and/or a weak forced signature is not yet emergent given substantial observational uncertainty. These findings are consistent with those found by Cook and Cane (2024), but contrast with some model projections of significantly increased ENSO variability under recent anthropogenic forcing.
description: This study is based upon dendrochronology of https://www.ncei.noaa.gov/access/paleo-search/study/12628 and builds on the data submission of https://www.ncei.noaa.gov/access/paleo-search/study/38402
8-Oct-2025: netCDF file updated with a new version containing additional variables.  Provided Keywords: oxygen isotopic composition, composite record, dendrochronology
DOI: 10.25921/8h0p-3p93
title: NOAA/WDS Paleoclimatology - Swetnam fire data from Steep and Burnt - IMPD USSAB002

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: This dataset was contributed as part of the North American Tree-ring Fire Scar Synthesis (NAFSS) project (https://www.ncei.noaa.gov/access/paleo-search/study/34853). Data were contributed to the project from the original data generators.
DOI: 10.15468/dl.j7uvbu
title: Occurrence Download

description: A dataset containing 221 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Country is Ukraine",
 "TaxonKey is Cyanobacteria",
 "Year 2015-2025"
 ]
}

 The dataset includes 221 records from 8 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025163-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/8njn-wt04
title: NOAA/WDS Paleoclimatology - Southeast Pacific Ocean Bottom Water Temperature Reconstruction and Stable Isotope, Mg/Ca, and Silt Data over the last 30,000 years

description: Southern-sourced Antarctic Intermediate Water (AAIW) and Subantarctic Mode Water (SAMW) are currently major sinks of atmospheric CO2. During the last deglaciation, atmospheric CO2 levels increased significantly during two specific time periods, Heinrich Stadial 1 (H1) ~18–14.6 ka BP (thousand years ago before present) and the Younger Dryas (YD) ~12.8–11.5 ka BP. Model simulation and proxy data studies suggest that AAIW/SAMW was crucial in explaining these changes during H1 and YD, but its variability and properties in the Southeast Pacific Ocean are still largely unknown. Here, we present records of benthic foraminiferal carbon isotopes, Mg/Ca-based water temperatures, paleosalinity reconstructions, and sortable silt mean grain size variations over the last 30 thousand years from Ocean Drilling Program (ODP) Site 1233, in the Southeast Pacific Ocean, which is bathed in AAIW/SAMW. Our proxy data suggest an increased northward circulation of high pCO2/ nutrient-enriched AAIW/SAMW during H1 and YD. Our data provides support for AAIW/SAMW as one of the important conduits for deglacial oceanic outgassing in the eastern equatorial Pacific upwelling.
DOI: 10.25921/8pxc-f066
title: NOAA/WDS Paleoclimatology - Ticse-Otarola - Toldopampa - PORO - ITRDB PER011

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: Tropical Tree Ring Network SiteID = POROD_PER_01
DOI: 10.25921/8yxz-ft64
title: NOAA/WDS Paleoclimatology - Trouet - Ndola - BRBO - ITRDB ZMB004

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: Tropical Tree Ring Network SiteID = BRBOE_ZAM_01
DOI: 10.5517/cc7g80y
title: CCDC 222239: Experimental Crystal Structure Determination

description: Related Article: S.S.Salim, R.K.Bellingham, R.C.D.Brown|2004|Eur.J.Org.Chem.|2004|800|doi:10.1002/ejoc.200300725
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc7g81z
title: CCDC 222240: Experimental Crystal Structure Determination

description: Related Article: S.S.Salim, R.K.Bellingham, R.C.D.Brown|2004|Eur.J.Org.Chem.|2004|800|doi:10.1002/ejoc.200300725
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc7g820
title: CCDC 222241: Experimental Crystal Structure Determination

description: Related Article: S.S.Salim, R.K.Bellingham, R.C.D.Brown|2004|Eur.J.Org.Chem.|2004|800|doi:10.1002/ejoc.200300725
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc664yg
title: CCDC 184665: Experimental Crystal Structure Determination

description: Related Article: A.Sharon, P.R.Maulik, C.Vithana, Y.Ohashi, V.J.Ram|2004|Eur.J.Org.Chem.|2004|886|doi:10.1002/ejoc.200300549
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc7g26y
title: CCDC 222059: Experimental Crystal Structure Determination

description: Related Article: A.Sharon, P.R.Maulik, C.Vithana, Y.Ohashi, V.J.Ram|2004|Eur.J.Org.Chem.|2004|886|doi:10.1002/ejoc.200300549
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc7g27z
title: CCDC 222060: Experimental Crystal Structure Determination

description: Related Article: A.Sharon, P.R.Maulik, C.Vithana, Y.Ohashi, V.J.Ram|2004|Eur.J.Org.Chem.|2004|886|doi:10.1002/ejoc.200300549
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc7g280
title: CCDC 222061: Experimental Crystal Structure Determination

description: Related Article: A.Sharon, P.R.Maulik, C.Vithana, Y.Ohashi, V.J.Ram|2004|Eur.J.Org.Chem.|2004|886|doi:10.1002/ejoc.200300549
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc766zl
title: CCDC 214519: Experimental Crystal Structure Determination

description: Related Article: V.A.Reznikov, G.I.Roshchupkina, D.G.Mazhukin, P.A.Petrov, S.A.Popov, S.V.Fokin, G.V.Romanenko, T.V.Rybalova, Y.V.Gatilov, Y.G.Shvedenkov, I.G.Irtegova, L.A.Shundrin, V.I.Ovcharenko|2004|Eur.J.Org.Chem.|2004|749|doi:10.1002/ejoc.200300536
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc7c8f8
title: CCDC 219369: Experimental Crystal Structure Determination

description: Related Article: E.Gorobets, V.Stepanenko, J.Wicha|2004|Eur.J.Org.Chem.|2004|783|doi:10.1002/ejoc.200300611
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.