cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/1v1z-q978
title: NOAA/WDS Paleoclimatology - Mundo - Pinalada Redonda-Arroyo Malalco - ARAR - ITRDB ARGE120

description: Seventeen tree-ring chronologies from the conifer Araucaria araucana (Molina) K. Koch have been analyzed across its range of distribution in Argentina. We studied the growth patterns and determined the main climatic factors influencing A. araucana radial growth. All the chronologies show a strong common signal observed by the high amount of variance explained by the first principal component (PC1) and the high mean correlation (r = 0.597) between the chronologies over the 1676-1974 interval. On this basis, we developed a regional chronology that is 866 years long (A.D. 1140-2006) and includes 621 tree-ring series. Based on the PC2 scores, chronologies were clearly separated by elevation in high- and low-elevation records. Regional tree growth is strongly negatively related to temperatures during summer and fall in the previous-growing season and spring in the current-growing season, respectively. A positive association of tree growth with precipitation is recorded during spring in the current growing season. These results suggest a close relationship between A. araucana tree growth and water availability on a regional scale. This observation is also consistent with a positive and significant correlation between our A. araucana regional record and a reconstruction of November-December rainfall for northern Patagonia inferred from the xeric Austrocedrus chilensis during the past 400 years. Negative correlations between A. araucana regional growth and the sea surface temperature in the Nino 3.4 region reflect the occurrence of above-mean summer temperatures in the region during positive tropical Pacific SST anomalies. The negative relationship with the Antarctic Oscillation (AAO) results from reduced precipitation in our study region during the positive phase of the AAO. The effect of elevation on water availability is consistent with significant correlations between ring-width variations at lower elevations and the Palmer Drought Severity Index during spring and summer in the current growing season. Our study emphasizes the high dendroclimatological potential of A. araucana chronologies for reconstructing past climate variations in northern Patagonia during the past millennium.
description: NOAA Template Raw Measurements file added 2019-04-29.
DOI: 10.25921/1x34-wh43
title: NOAA/WDS Paleoclimatology - D'Arrigo - Coastal Alaska Composite - TSME - ITRDB AK112

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: NOAA Template Raw Measurements file added 2019-02-08.
DOI: 10.25921/1s3n-pn59
title: NOAA/WDS Paleoclimatology - Maxwell - Smokehole - JUVI - ITRDB WV014

description: This paper presents a multicentury reconstruction of May precipitation (1200-1997) for the mid-Atlantic region of the United States. The reconstruction is based on the first principal component (PC1) of two millennial-length Juniperus virginiana L. (eastern red cedar) tree-ring chronologies collected from rocky, limestone sites in the Ridge and Valley province of West Virginia. A split-calibration linear regression model accounted for 27% of the adjusted variance in the instrumental record and was stable through time. The model was verified by the reduction of error (RE = 0.21) and coefficient of efficiency (CE = 0.20) statistics. Multidecadal changes in precipitation were common throughout the reconstruction, and wetter than median conditions and drier than median conditions occurred during the medieval climate anomaly (1200-1300) and the Little Ice Age (1550-1650), respectively. The full reconstruction contained evidence of interannual and decadal variability; however, the twentieth century recorded the greatest number of decadal extreme wet and dry periods. A comparison of the May precipitation reconstruction to other regional reconstructions [Potomac River, Maryland, streamflow (Cook and Jacoby); Virginia/North Carolina July Palmer hydrologic drought index (PHDI; Stahle et al.); Missouri July PHDI (Cleaveland and Stahle); and White River, Arkansas, streamflow (Cleaveland)] showed that the eastern U.S. decadal drought and pluvial events extended into the mid-Atlantic region. A positive correlation between PC1 and the winter North Atlantic Oscillation (NAO) index and comparisons of smoothed May precipitation and the NAO (Luterbacher et al.) indicated that J. virginiana's response to May precipitation was mediated by winter temperature.
description: Cores and cross sections were collected at three sites with similar slope, aspect, and elevation in the Smokehole Canyon, West Virginia. They were compiled into a single chronology for climate reconstruction. NOAA Template Raw Measurements file added 2020-01-15.
DOI: 10.25921/184d-j707
title: NOAA/WDS Paleoclimatology - Woodhouse - Bald Mountain - PIPO - ITRDB CO659

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 Raw Measurements file added 2020-01-15.
DOI: 10.25921/1dpn-w303
title: NOAA/WDS Paleoclimatology - WAIS Divide Ice Core 2400 Year Sulfate and Nitrate Isotope Data

description: The 17O excess (D17O = d17O-0.52 x d18O) of sulfate and nitrate reflects the relative importance of their different production pathways in the atmosphere. A new record of sulfate and nitrate D17O spanning the last 2400 years from the West Antarctic Ice Sheet Divide ice core project shows significant changes in both sulfate and nitrate D17O in the most recent 200 years, indicating changes in their formation pathways. The sulfate D17O record exhibits a 1.1 per mil increase in the early 19th century from (2.4 +/- 0.2) per mil to (3.5 +/- 0.2) per mil, which suggests that an additional 12-18% of sulfate formation occurs via aqueous-phase production by O3, relative to that in the gas phase. Nitrate D17O gradually decreases over the whole record, with a more rapid decrease between the mid-19th century and the present day of 5.6 per mil, indicating an increasing importance of RO2 in NOx cycling between the mid-19th century and the present day in the mid- to high-latitude Southern Hemisphere. The former has implications for the climate impacts of sulfate aerosol, while the latter has implications for the tropospheric O3 production rate in remote low-NOx environments. Using other ice core observations, we rule out drivers for these changes other than variability in extratropical oxidant (OH, O3, RO2, H2O2, and reactive halogens) concentrations. However, assuming OH, H2O2, and O3 are the main oxidants contributing to sulfate formation, Monte Carlo box model simulations require a large (>= 260%) increase in the O3 /OH mole fraction ratio over the Southern Ocean in the early 19th century to match the sulfate D17O record. This unlikely scenario points to a~deficiency in our understanding of sulfur chemistry and suggests other oxidants may play an important role in sulfate formation in the mid- to high-latitude marine boundary layer. The observed decrease in nitrate D17O since the mid-19th century is most likely due to an increased importance of RO2 over O3 in NOx cycling and can be explained by a 60-90% decrease in the O3 / RO2 mole fraction ratio in the extratropical Southern Hemisphere NOx-source regions.
description: Isotopic composition of sulfate and nitrate from 3 WAIS Divide Ice Cores.  Data set updated 10/7/2014 to add age model, correct citation, and add additional data (accumulation, MSA, NO3-, H2O2, Sulfur, Acid, NA+, water d18O).
DOI: 10.25921/154r-t927
title: NOAA/WDS Paleoclimatology - Zgraggen - Gentalnord - FASY - ITRDB SWIT244

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 Raw Measurements file added 2019-02-05.
DOI: 10.25921/1b5e-jq88
title: NOAA/WDS Paleoclimatology - Büntgen - Hopflsteig 493 - LADE - ITRDB SWIT255

description: Annually resolved summer temperatures for the European Alps are described. The reconstruction covers the a.d. 755-2004 period and is based on 180 recent and historic larch [Larix decidua Mill.] density series. The regional curve standardization method was applied to preserve interannual to multicentennial variations in this high-elevation proxy dataset. Instrumental measurements from high- (low-) elevation grid boxes back to 1818 (1760) reveal strongest growth response to current-year June-September mean temperatures. The reconstruction correlates at 0.7 with high-elevation temperatures back to 1818, with a greater signal in the higher-frequency domain (r = 0.8). Low-elevation instrumental data back to 1760 agree with the reconstruction's interannual variation, although a decoupling between (warmer) instrumental and (cooler) proxy data before 1840 is noted. This offset is larger than during any period of overlap with more recent high-elevation instrumental data, even though the proxy time series always contains some unexplained variance. The reconstruction indicates positive temperatures in the tenth and thirteenth century that resemble twentieth-century conditions, and are separated by a prolonged cooling from 1350 to 1700. Six of the 10 warmest decades over the 755-2004 period are recorded in the twentieth century. Maximum temperature amplitude over the past 1250 yr is estimated to be 3.1C between the warmest (1940s) and coldest (1810s) decades. This estimate is, however, affected by the calibration with instrumental temperature data. Warm summers seem to coincide with periods of high solar activity, and cold summers vice versa. The record captures the full range of past European temperature variability, that is, the extreme years 1816 and 2003, warmth during medieval and recent times, and cold in between. Comparison with regional- and large-scale reconstructions reveals similar decadal to longer-term variability.
description: NOAA Template Raw Measurements file added 2019-02-05.
DOI: 10.25921/14me-pz34
title: NOAA/WDS Paleoclimatology - Cook - Naspey - TSDU - ITRDB BT002

description: The Asian monsoon system affects more than half of humanity worldwide, yet the dynamical processes that govern its complex spatiotemporal variability are not sufficiently understood to model and predict its behavior, due in part to inadequate long-term climate observations. Here we present the Monsoon Asia Drought Atlas (MADA), a seasonally resolved gridded spatial reconstruction of Asian monsoon drought and pluvials over the past millennium, derived from a network of tree-ring chronologies. MADA provides the spatiotemporal details of known historic monsoon failures and reveals the occurrence, severity, and fingerprint of previously unknown monsoon megadroughts and their close linkages to large-scale patterns of tropical Indo-Pacific sea surface temperatures. MADA thus provides a long-term context for recent monsoon variability that is critically needed for climate modeling, prediction, and attribution.
description: Purpose of Collection:  
# Climatology - precipitation analysis  
#  NOAA Template Raw Measurements file added 2019-04-08. 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: 10.25921/13p1-mf81
title: NOAA/WDS Paleoclimatology - Azpeleta Tarancón fire data from Mistletoe Canyon, south central New Mexico - IMPD USMC-001

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 site was sampled to assess the spatiotemporal variability of fire regimes on Mescalero Apache lands and lands adjacent.
DOI: 10.25921/1yfk-v815
title: NOAA/WDS Paleoclimatology - Okpilak Lake, Alaska 14,500 Year Multiproxy Sediment Data

description: Analyses of lithology, organic-matter content, magnetic susceptibility, and pollen in a sediment core from Okpilak Lake, located in the northeastern Brooks Range, provide new insights into the history of climate, landscape processes, and vegetation in northern Alaska since 14,500 cal year BP. The late-glacial interval (>11,600 cal year BP) featured sparse vegetation cover and the erosion of minerogenic sediment into the lake from nearby hillslopes, as evidenced by Cyperaceae-dominated pollen assemblages and high magnetic susceptibility (MS) values. Betula expanded in the early Holocene (11,600-8,500 cal year BP), reducing mass wasting on the landscape, as reflected by lower MS. Holocene sediments contain a series of silt- and clay-dominated layers, and given their physical characteristics and the topographic setting of the lake on the braided outwash plain of the Okpilak River, the inorganic layers are interpreted as rapidly deposited fluvial sediments, likely associated with intervals of river aggradation, changes in channel planform, and periodic overbank flow via a channel that connects the river and lake. The episodes of fluvial dynamics and aggradation appear to have been related to regional environmental variability, including a period of glacial retreat during the early Holocene, as well as glacial advances in the middle Holocene (5,500-5,200 cal year BP) and during the Little Ice Age (500-400 cal year BP). The rapid deposition of multiple inorganic layers during the early Holocene, including thick layers at 10,900-10,000 and 9,400-9,200 cal year BP, suggests that it was a particularly dynamic interval of fluvial activity and landscape change.
description: Multiproxy sediment data from Okpilak Lake, Alaska, for the past 14,500 years. 
Paleoenvironmental proxies measured include lithology, organic-matter content, 
magnetic susceptibility, and pollen taxa. 

Okpilak Lake, Alaska: 69°24'29"N, 144°02'56"W, 593m elevation
DOI: 10.25921/1y2k-2k31
title: NOAA/WDS Paleoclimatology - Wonderkrater, South Africa 20,000 Year Pollen Data

description: Pollen spectra from cores of organic spring deposits from the Transvaal provide evidence for the climatic evolution of the province during the last 35,000 yr B.P. or more. The past climatic phases are derived from palynological reconstructions of past vegetation types by comparison of fossil pollen data with modern surface pollen spectra from various localities. Evidence is provided for an early moist, cool phase with relatively mesic bushveld and expanded montane forest in the central Transvaal, followed by a drier period with drier bushveld which probably lasted until approximately 25,000 yr B.P. During the next phase, which at the latest ended about 11,000 yr B.P., the temperatures were probably 5°-6°C cooler than at present. At that time bushveld vegetation in the central Transvaal was replaced by open grassland with macchia elements. Climatic amelioration came and semiarid savanna returned to the plains, at first gradually and then developing into a warm Kalahari thornveld-type vegetation. After 6000 yr B.P. it apparently became slightly wetter and a more broad-leafed bushveld developed. About 4000 yr B.P. it again became cooler and slightly wetter and the bushveld vegetation on the central and northern plains was comparable to present open upland types. After 2000 yr B.P. conditions gradually became warner until about 1000 yr B.P., when the modern climate of the central Transvaal bushveld originated.
description: 20,000 year pollen record from a peat deposit surrounding 
the Wonderkrater thermal spring near Naboomspruit, in the 
Transvaal bushveld, South Africa. 

Wonderkrater: 24°26'S, 28°45'E, elevation 1100m.
DOI: 10.25921/1sdk-ap35
title: NOAA/WDS Paleoclimatology - Allen - Blue Tier - PHAS - ITRDB AUSL026

description: Between two and four increment cores were obtained from approximately 20 trees at each of 16 sites of P. aspleniifolius across Tasmania. Four regions were defined and temperature data for climate stations from each of these regions were transformed into dimensionless time series appropriate for each region. The ZI was constructed from Melbourne and Hobart mean sea level pressure (MSLP). Correlations were calculated between climate data and ring widths over most of the 20th century. Data were then segregated into two subperiods to assess whether or not temporal changes in ring width response have occurred over the 20th century.
The dominant feature of the correlation functions was a negative correlation with temperatures of the previous growing season. Correlation between the ZI and ring width is most significant, and positive, in November and March of the previous growing season. Differences in the shape of the correlation functions, and their strength is apparent over the course of the century. In general, correlations have become weaker and less consistent among the 16 sites for the latter part of the century. Temperatures have generally increased during the 1900s over which time period correlations have been calculated.
The temporally changing climatic response in ring widths is consistent with a hypothesis of competition for resources between different parts of a plant. A nonlinear response to climate over a short-time period violates one of the basic assumptions of dendroclimatology, therefore suggesting further investigation of both the physiology of trees used for dendroclimatological purposes and the statistical methods used for climatic reconstruction.
description: NOAA Template Raw Measurements file added 2019-01-24. NOAA Template Raw Measurements file added 2019-02-01.
DOI: 10.15468/dl.dsmwhs
title: Occurrence Download

description: A dataset containing 2116 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Platanthera transversa"
 ]
}

 The dataset includes 2116 records from 52 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0009949-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25582/data.2024-04.3094356/2559981
title: Data for EMSL Project 51287 from April 2024
DOI: 10.25582/data.2024-04.3094357/2559982
title: Data for EMSL Project 51287 from April 2024
DOI: 10.25582/data.2024-04.3094358/2559983
title: Data for EMSL Project 51287 from April 2024
DOI: 10.25582/data.2024-04.3094360/2559984
title: Data for EMSL Project 51287 from April 2024
DOI: 10.25582/data.2024-04.3094361/2559985
title: Data for EMSL Project 51287 from April 2024
DOI: 10.25582/data.2024-04.3094362/2559986
title: Data for EMSL Project 51287 from April 2024
DOI: 10.25582/data.2024-04.3094363/2559987
title: Data for EMSL Project 51287 from April 2024
DOI: 10.25582/data.2024-04.3094365/2559988
title: Data for EMSL Project 51287 from April 2024
DOI: 10.25582/data.2024-04.3094367/2559989
title: Data for EMSL Project 51287 from April 2024
DOI: 10.25582/data.2024-04.3094368/2559990
title: Data for EMSL Project 51287 from April 2024
DOI: 10.5281/zenodo.14940257
title: Bayesian phylogenetics sheds new light on sudden cultural changes in lithic production across the Mesolithic-Neolithic transition in Western Norway.

description: The data provided here make up the supplementary information for the journal article "Bayesian phylogenetics sheds new light on sudden cultural changes in lithic production across the Mesolithic-Neolithic transition in Western Norway - Supplementary" by Victor Lundström. All analyses and figures were performed and or produced in R v4.3.1, Rstudio 2024.04.1, QGIS 3.22.14, Tracer v1.6 and BEAST v2.7.4.
DOI: 10.15468/dl.z6cy52
title: Occurrence Download

description: A dataset listing the 2868 species recorded in GBIF matching the query:
{
 "and" : [
 "Country is Chad",
 "OccurrenceStatus is Present",
 "TaxonKey is Plantae"
 ]
}

 The dataset's 2868 records were derived from 71 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0003703-250525065834625/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15156/bio/sh1406073.10fu
title: SH1406073.10FU

description: UNITE provides a unified way for delimiting, identifying, communicating, and working with DNA-based Species Hypotheses (SH). All fungal ITS sequences in the international nucleotide sequence databases are clustered to approximately the species level by applying a set of dynamic distance values (<0.5 - 3.0%). All species hypotheses are given a unique, stable name in the form of a DOI, and their taxonomic and ecological annotations are verified through distributed, web-based third-party annotation efforts. SHs are connected to a taxon name and its classification as far as possible (phylum, class, order, etc.) by taking into account identifications for all sequences in the SH. An automatically or manually designated sequence is chosen to represent each such SH. These sequences are released (https://unite.ut.ee/repository.php) for use by the scientific community in, for example, local sequence similarity searches and next-generation sequencing analysis pipelines. The system and the data are updated automatically as the number of public fungal ITS sequences grows.