cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/jc93-he62
title: NOAA/WDS Paleoclimatology - Lake Barrine, NE Australia brGDGT Data since 18 cal ka BP

description: Terrestrial temperature exerts a major influence on vegetation distribution, the hydrologic cycle and many biogeochemical cycles. Yet little research into terrestrial paleo-temperature reconstruction has been conducted covering the last deglaciation in northern Australia, and recent global surface temperature reconstructions include no data from this area. Here, for the first time, we reconstructed the mean annual air temperatures (MAAT) at Lake Barrine in this region from 18.3 to 1.7 cal ka BP at a relatively high resolution (averaged 400 yr). This temperature reconstruction was based on separated 5- and 6-methyl brGDGTs (branched glycerol dialkyl glycerol tetraethers) that are increasingly used to reconstruct terrestrial temperature because of their ubiquity and a preservation window of at least tens of millions of years. A 7.2 m master core from the center of the lake was extracted, along with five surface lake sediment and seven catchment soil samples. The results indicated that the fractional abundances of all the brGDGTs in the catchment soils, surface and downcore sediments in Lake Barrine were closely correlated, with dominant tetramethylated brGDGTs, especially Ia. We applied a global calibration to reconstruct the temperature using the lake sediment samples and a binary mixing model to correct temperature bias caused by soil-derived brGDGT input. The corrected temperature trend estimate compares favorably with the temperature anomaly recorded in the EPICA ice core record, except during the Younger Dryas. The corrected MAAT estimates at Lake Barrine indicated an increase across Heinrich Stadial 1 (HS 1; 18 – 14.9 cal ka BP) from 19.4 °C to 21.9 °C, a stable temperature during the Antarctic Cold Reversal (ACR; 14.7 – 13 cal ka BP) of ~21.6 °C, followed by a slight decrease during the Younger Dryas (YD; 12.8 – 11.6 cal ka BP). After a further 1.6 °C increase into the early Holocene, the temperature decreased by 1.8 °C through the Holocene until a recent rise by 1.6 ? after 1.7 cal ka BP.
description: BrGDGTs from surface and downcore sediments in Lake Barrine and catchment soils are included in the worksheets. 
       Provided Keywords: northeastern Australia, crater lake sediment, brGDGTs
DOI: 10.25921/jkhq-ct94
title: NOAA/WDS Paleoclimatology - D'Arrigo - Central Northwest Territories Composite - PCGL - ITRDB CANA322

description: Previous tree-ring-based Northern Hemisphere temperature reconstructions portray a varying amplitude range between the "Medieval Warm Period" (MWP), "Little Ice Age" (LIA) and present. We describe a new reconstruction, developed using largely different methodologies and additional new data compared to previous efforts. Unlike earlier studies, we quantify differences between more traditional (STD) and Regional Curve Standardization (RCS) methodologies, concluding that RCS is superior for retention of low-frequency trends. Continental North American versus Eurasian RCS series developed prior to merging to the hemispheric scale cohere surprisingly well, suggesting common forcing, although there are notable deviations (e.g., fifteenth to sixteenth century). Results indicate clear MWP (warm), LIA (cool), and recent (warm) episodes. Direct interpretation of the RCS reconstruction suggests that MWP temperatures were nearly 0.7C cooler than in the late twentieth century, with an amplitude difference of 1.14C from the coldest (1600-1609) to warmest (1937-1946) decades. However, we advise caution with this analysis. Although we conclude, as found elsewhere, that recent warming has been substantial relative to natural fluctuations of the past millennium, we also note that owing to the spatially heterogeneous nature of the MWP, and its different timing within different regions, present palaeoclimatic methodologies will likely "flatten out" estimates for this period relative to twentieth century warming, which expresses a more homogenous global "fingerprint." Therefore we stress that presently available paleoclimatic reconstructions are inadequate for making specific inferences, at hemispheric scales, about MWP warmth relative to the present anthropogenic period and that such comparisons can only still be made at the local/regional scale.
description: Central Northwest Territories Composite, includes sites 
# # Mackenzie Mountain, Franklin Mountain, Coppermine 1978, 
# # Coppermine River 2003, and Hornby. 
# # 
# # Project Title "Synthesis of Three Decades of Research 
# # on Tree Growth in Northern Forests in relation to 
# # Global Climatic Change"  NOAA Template Raw Measurements file added 2019-01-27. NOAA Template Raw Measurements file added 2019-02-04. July 2024: Elevation added by WDS-Paleo using get_elev_point() from the elevatr R package with the AWS Terrain Tiles (aws) and WGS 84 reference frame.
DOI: 10.25921/j46x-k532
title: NOAA/WDS Paleoclimatology - O'Connor fire data from Pinalenos_K21, Southeast Arizona - IMPD USK21001

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: 10.15468/dl.f38f8c
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Struthioniformes)",
 "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 70,-20 70,-20 80,-30 80,-30 70))"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0021067-251009101135966/datasets/export for details.
DOI: 10.25921/jsbb-7f82
title: NOAA/WDS Paleoclimatology - Multi-site - del18O Data  - 2001

description: The El Niño–Southern Oscillation (ENSO) is the most potent source of interannual climate variability. Uncertainty surrounding the impact of greenhouse warming on ENSO strength and frequency has stimulated efforts to develop a better understanding of the sensitivity of ENSO to climate change. Here we use annually banded corals from Papua New Guinea to show that ENSO has existed for the past 130,000 years, operating even during “glacial” times of substantially reduced regional and global temperature and changed solar forcing. However, we also find that during the 20th century ENSO has been strong compared with ENSO of previous cool (glacial) and warm (interglacial) times. The observed pattern of change in amplitude may be due to the combined effects of ENSO dampening during cool glacial conditions and ENSO forcing by precessional orbital variations.
description: Results of analysis of cores collected from 'fossil' massive Porites corals exposed in the raised reefs of the Huon Peninsula, Papua New Guinea, and living corals. The cores were collected vertically down the axis of maximum growth of the colony. These samples were analysed for d18O, then the data interpolated to seasonal resolution. Long-term analytical precision of ± 0.16 ‰ d18O (2s) based on analysis of internal consistency standards. In this region, seasonal and interannual variations in skeletal d18O are due to the combined effects of changes in precipitation/evaporation balance and temperature; see Tudhope et al., 1995, Earth Planet. Sci. Lett., 136, 575, and Tudhope et al., 2001, Science, 291, 1511-1517 for further discussion of climatic interpretation.
DOI: 10.25921/ja7y-xq63
title: NOAA/WDS Paleoclimatology - Swetnam fire data from Biledo Peak Southwest - IMPD USWTH002

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/j8an-4g66
title: NOAA/WDS Paleoclimatology - Swetnam fire data from Wawona Upper - IMPD USWWM002

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/je4q-5z42
title: NOAA/WDS Paleoclimatology - Villars Cave Geochemical Data from 178000 to 1100 Cal Yr BP

description: The Vil-car-1 flowstone core from Villars cave (SW France) provides one of the first European speleothem records extending back to 180 ka, based on U–Th TIMS and MC-ICP-MS measurements. The core offers a continuous record of Termination II and the Last Interglacial. The penultimate deglaciation is characterized by a prominent 5‰ depletion in calcite δ18O. Determining which specific environmental factors controlled such a large oxygen isotopic shift offers the opportunity to assess the impact of various factors influencing δ18O variations in speleothem calcite.
Oxygen isotope analyses of fluid inclusions indicate that drip water δ18O remained within a very narrow range of ±1‰ from Late MIS6 to the MIS5 δ18O optimum. The possibility of such a stable behaviour is supported by simple calculations of various effects influencing seepage water δ18O.
Although this could suggest that the isotopic shift in calcite is mainly driven by temperature increase, attempts to quantify the temperature shift from Late MIS6 to the MIS5 δ18O optimum by assuming an equilibrium relationship between calcite and fluid inclusion δ18O yield unreasonably high estimates of ∼20 °C warming and Late MIS6 cave temperatures below 0 °C; this suggests that the flowstone calcite precipitated out of thermodynamic equilibrium at this site.
Using a method proposed by Guo et al. (submitted for publication) combining clumped isotope measurements, fluid inclusion and modern calcite δ18O analyses, it is possible to quantitatively correct for isotopic disequilibrium and estimate absolute paleotemperatures. Although the precision of these absolute temperature reconstructions is limited by analytical uncertainties, the temperature rise between Late MIS6 and the MIS5 optimum can be robustly constrained between 13.2 ± 2.6 and 14.6 ± 2.6 °C (1σ), consistent with existing estimates from Western Europe pollen and sea-surface temperature records.
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: Vil-stm11 (SISAL entity_id = 29): Detrital Th correction made only on the top two samples (dating_id = 8198 and 8199). U-Th ages for entity_id=29 were calculated using the following decay constants: 234U: 2.835*10^(-6)/yr, 238U: 1.55125*10^(-10)/yr, 230Th: 9.1952*10^(-6)/yr, 232Th: 4.9475*10^(-11)/yr. Decay constants are probably derived from the following papers: 230Th: Meadows et al.,1980, 234U: average value from De Bievre et al. 1971 and Lounsbury and Durham 1971. \\ Vil-stm1 (entity_id = 29): The normalisation to Ca for trace elements is assumed based on the best of our knowledge, contact with authors was not possible.\\ Vegetation: mainly oak and hornbeam forest, the part of the cave where stalagmite stm-1 was sampled is covered by grassland. Host rock cover thickness over the cave is given as an average in the sheet. The thickness reported in the paper is 25-45 m.
DOI: 10.25921/jt7c-7313
title: NOAA/WDS Paleoclimatology - Rohner - Weidwald - QUSP - ITRDB CHE459

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: 610 - 640 m a.s.l.
DOI: 10.25921/jqwn-yz70
title: NOAA/WDS Paleoclimatology - Vietnam Biomarker and Temperature Reconstruction Data during Marine Isotope Stage 3

description: Limited hydrological data coupled with a reliance on the monsoon rains for agriculture make Southeast (SE) Asia vulnerable to climate change. To develop a better understanding of how SE Asia responds to climatic forcings, we provide a paleoclimate perspective by reconstructing temperature and hydroclimate from a wetland outcrop in the Central Highlands of Vietnam (CHV) during Marine Isotope Stage 3 (MIS 3). Mean annual atmospheric temperatures inferred from brGDGTs (branched glycerol dialkyl glycerol tetraethers) indicate an increase from 23 to 26 °C between ~54 and 37 cal ka BP, which follows an increase in mean annual insolation at the latitude of the site. dDwax data show a shift from a greater proportion of summer monsoon rain derived from the Bay of Bengal between 54 and 49 cal ka BP toward more autumn rain from the South China Sea (also known as the Vietnam East Sea) for most of the rest of the record. brGDGT-inferred soil pH suggests that the climate was wetter at 54 to 49 cal ka BP, then became drier, then returned to wet conditions approaching 37 cal ka BP. Both orbital forcing and changes in the exposure of the Sunda Shelf likely influenced hydroclimate in the CHV. d13Cwax indicates that C4 plants dominate the vegetation cover during MIS 3. Comparison between our new record from the CHV with existing water isotope proxy records reveals coherent changes with nearby speleothem data, but regional differences between the history of hydroclimate in SE Asia and in the central Indian Monsoon domain. As a snapshot of glacial climate conditions, our data provide new information on the past drivers of climate in an understudied region.
DOI: 10.25921/jeq5-bx19
title: NOAA/WDS Paleoclimatology - Biondi et al 2001 Pacific Decadal Oscillation Reconstruction

description: Climate in the North Pacific and North American sectors has experienced interdecadal shifts during the twentieth century. A network of recently developed tree-ring chronologies for Southern and Baja California extends the instrumental record and reveals decadal-scale variability back to 1661. The Pacific decadal oscillation (PDO) is closely matched by the dominant mode of tree-ring variability that provides a preliminary view of multiannual climate fluctuations spanning the past four centuries. The reconstructed PDO index features a prominent bidecadal oscillation, whose amplitude weakened in the late l700s to mid-1800s. A comparison with proxy records of ENSO suggests that the greatest decadal-scale oscillations in Pacific climate between 1706 and 1977 occurred around 1750, 1905, and 1947.
description: Pacific Decadal Oscillation Reconstruction based on tree ring chronologies. The tree ring data is also archived at the World Data Center for Paleoclimatology, International Tree Ring Data Bank. Climate in the North Pacific and North American sectors has experienced interdecadal shifts during the 20th century. A network of recently developed tree-ring chronologies for Southern and Baja California extends the instrumental record, and reveals decadal-scale variability back to AD 1661. The Pacific Decadal Oscillation (PDO) is closely matched by the dominant mode of tree-ring variability, which provides a preliminary view of multi-annual climate fluctuations spanning the past four centuries. The reconstructed PDO index features a prominent bidecadal oscillation, whose amplitude weakened in the late 1700s to mid-1800s. A comparison with proxy records of ENSO suggests that the greatest decadal-scale oscillations in Pacific climate between 1706 and 1977 occurred around 1750, 1905, and 1947.
DOI: 10.25921/jh1p-2369
title: NOAA/WDS Paleoclimatology - Aragão - Aiuaba - ASMU - ITRDB BRA040

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 = ASMUL_BRA_01
DOI: 10.25921/jhyg-nf68
title: NOAA/WDS Paleoclimatology - Wils - Woken-Woybila-Mariam - JUPC - ITRDB ETH006

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 = JUPRO_ETH_02
DOI: 10.25921/jd8r-nc90
title: NOAA/WDS Paleoclimatology - Seawater Sr/Ca in Florida and Around the World between 2016-2020 CE

description: Coral skeletal Sr/Ca ratios are a commonly used paleotemperature proxy that relies on stable seawater Sr/Ca ratios (Rsw). Recent observations call this assumption into question at some locations, particularly in the Florida Keys, USA. We collected Rsw time series data for 4 years from the Middle Keys with about weekly resolution, as well as several 24-hr time series from coral reef sites throughout the Caribbean, to quantify the magnitude and mode of Rsw variability and to assess its likely impact on coral Sr/Ca-based paleoclimate reconstructions. Continuous seawater samples were collected with four bottom-mounted osmotic pumps placed on a transect from inside Florida Bay to approximately 10 km offshore. In Florida Bay, Rsw displays annual cycles with high values in the summer and an amplitude of 0.4–0.5 mmol/mol that attenuates and becomes less periodic with increasing distance from the coast. We propose that this seawater Sr/Ca cycle may be due to a seasonal biogeochemical process related to the precipitation and dissolution of CaCO3 in Florida Bay, with the signal carried onto the shelf through mixing. The annual Rsw cycle can explain the low Sr/Ca–SST slopes that have been reported in local corals. Pseudo-coral Sr/Ca calculations indicate that Rsw causes enhanced uncertainty in reconstructed SST, even at the site 10 km offshore. The 24-hr time series show smaller diurnal variability in seawater Sr/Ca that appears to reflect local tides and hydrography, suggesting a similar potential for aberrant coral Sr/Ca–SST calibrations at other reef locations.
description: Seawater Sr/Ca to complement coral-based paleoclimate efforts. The study spanned 2016-2020 in the Middle Florida Keys with the grid extending from shore to the forereef area about 6km offshore, along about 11km of coastline. Samples in Khare et al., 2022 were sampled collected by hand from the surface and at the bottom by diver in the winter and summer in the Florida Keys. Samples of opportunity were collected by hand from a variety of locations in the Pacific, Indian and Atlantic Oceans. Samples from Hughes et al., 2025 were collected at 4 sites in the Florida Keys spanning across the shelf from Florida Bay to the forereef area via osmotic pumps into teflon tubing that was subsequently subsampled and analyzed in the laboratory. OSMO sampler dates are based on known days of pump deployment and retrieval, sample volume and pump rates.  Other samples were collected on known dates indicated.
      Provided Keywords: strontium, trace element, seawater chemistry, Sr/Ca