cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/gx77-vt29
title: NOAA/WDS Paleoclimatology - Fischer - Niederrheinisches Tiefland drn01 - QURO - ITRDB GERM204

description: An improved understanding of the spatiotemporal climate/growth relationship of our forests is of particular importance for assessing the consequences of climate warming. A total of 67 stands of beech (Fagus sylvatica L.), pedunculate oak (Quercus robur L.), sessile oak (Quercus petraea (Matt.) Liebl.), Scots pine (Pinus sylvestris L.), and spruce (Picea abies Karst.) from sites located in the transition zone from the lowlands to the low mountain ranges of West Germany have been analysed. A combination of pointer year and cluster analysis was used to find groups with similar growth anomaly patterns over the 1941-2000 period. Shifted reaction patterns especially characterise differences in the growth behaviour of the clusters. These are controlled by different reactions to the climate conditions in winter and spring and are determined by a complex system of forcing factors. Results of this study reflect the enormous importance of the length of the growing season. Increasing the duration of the vegetation period climate warming can change the climate/growth relationship of trees, thereby confounding climate reconstructions which use tree rings. Since forcing factors have been detected that are more important than the tree species, we recommend the application of growth-specific approaches for the analysis of tree species' vulnerability to climate.
description: Purpose of Collection:
# climate/growth relationship NOAA Template Raw Measurements file added 2019-02-05.
DOI: 10.25921/ghcr-3p77
title: NOAA/WDS Paleoclimatology - Great Barrier Reef Holocene Mollusc Amino Acid Racemization Data

description: Calibrated amino acid racemisation methods allow paleobiologists to quantify the age distributions of fossil assemblages. Focussing on 110 Scissulina dispar and 110 Liloa sp. specimens collected from Bramble and Rib Reefs (central Great Barrier Reef, Australia), we create calibration curves for seven amino acids for each taxon. Using these curves we calculate seven quasi-independent age estimates for each specimen. We evaluate each calibration curve for consistency and use the weighted mean and uncertainty of the quasi-independent ages as the specimen age for geochronological analyses. We extend the "Gamma" criterion for screening specimens and describing the precision of an AAR dataset from two amino acids to any number of amino acids. Using weighted mean ages and Gamma < 0.2 we demonstrate that the top 1.4 m of Bramble and Rib Reefs preserve remarkably well-mixed shell assemblages spanning from living to ~3400 years old with median ages of 373 and 326 years old, respectively.
description: D/L and concentration data for seven amino acids (Amino Acid Racemization [AAR]) analyzed in two molluscan species from Holocene sediment cores from Bramble and Rib reefs (Great Barrier Reef), Australia
DOI: 10.25921/g4zc-mf21
title: NOAA/WDS Paleoclimatology - Lara - Regimiento Los Barros - NOPU - ITRDB CHIL022

description: Nothofagus pumilio (Poepp et Endl.) Krasser, is a deciduous tree species that grows in Chile and adjacent Argentina between 36 and 56°S, often forming the Andean tree line. This paper presents the first eight tree-ring chronologies from N. pumilio at its northern range limit in the central Andes of Chile (36-39°S) and the first precipitation reconstruction for this region. Samples were taken from upper tree-line stands (1500-1700 m elevation) in three study areas: Vilches, Laguna del Laja, and Conguillío. Results indicate that, at the northern sites (Vilches and Laguna del Laja), the tree-ring growth of N. pumilio is positively correlated with late-spring and early summer precipitation and that higher temperatures reduce radial growth, probably because of an increase in evapotranspiration and decrease in water availability. At the southern Conguillío study area, radial growth was negatively correlated with late-spring and early summer precipitation. The presence of volcanic activity in this latter study area, which might have masked the climate signal, did not seem to have a significant influence on radial growth. A reconstruction of November-December (summer) precipitation for the period 1837-1996 from N. pumilio tree-ring chronologies accounted for 37% of instrumentally recorded precipitation variance. This is the first precipitation reconstruction from N. pumilio chronologies. Only temperature and snow cover have previously been reconstructed using this species. The reconstruction indicates that the driest and wettest 25-year periods within the past 160 years are 1890-1914 and 1917-1941, respectively.
description: Purpose of Collection:
# Climatology
# 
# Cores are stored at:
# University of Western Ontario NOAA Template Raw Measurements file added 2019-04-29.
DOI: 10.25921/gn7h-6j11
title: NOAA/WDS Paleoclimatology - Büntgen - RotztokiDobrawoda - PCAB - ITRDB POLA036

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/gvd5-ez06
title: NOAA/WDS Paleoclimatology - Gennaretti - Lake L1 Quebec - PCMA - ITRDB CANA458

description: Dated records of ice-cap growth from Arctic Canada recently suggested that a succession of strong volcanic eruptions forced an abrupt onset of the Little Ice Age between A.D. 1275 and 1300 [Miller GH, et al. (2012) Geophys Res Lett 39(2):L02708, 10.1029/2011GL050168]. Although this idea is supported by simulation experiments with general circulation models, additional support from field data are limited. In particular, the Northern Hemisphere network of temperature-sensitive millennial tree-ring chronologies, which principally comprises Eurasian sites, suggests that the strongest eruptions only caused cooling episodes lasting less than about 10 y. Here we present a new network of millennial tree-ring chronologies from the taiga of northeastern North America, which fills a wide gap in the network of the Northern Hemisphere's chronologies suitable for temperature reconstructions and supports the hypothesis that volcanoes triggered both the onset and the coldest episode of the Little Ice Age. Following the well-expressed Medieval Climate Anomaly (approximately A.D. 910-1257), which comprised the warmest decades of the last millennium, our tree-ring-based temperature reconstruction displays an abrupt regime shift toward lower average summer temperatures precisely coinciding with a series of 13th century eruptions centered around the 1257 Samalas event and closely preceding ice-cap expansion in Arctic Canada. Furthermore, the successive 1809 (unknown volcano) and 1815 (Tambora) eruptions triggered a subsequent shift to the coldest 40-y period of the last 1100 y. These results confirm that series of large eruptions may cause region-specific regime shifts in the climate system and that the climate of northeastern North America is especially sensitive to volcanic forcing. 
description: NOAA Template Raw Measurements file added 2019-02-04.
DOI: 10.15468/dl.nhqzxr
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Monoplacophora)",
 "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((-80 -10,-70 -10,-70 0,-80 0,-80 -10))"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0020814-251009101135966/datasets/export for details.
DOI: 10.25921/gjfw-6q58
title: NOAA/WDS Paleoclimatology - Neuwirth - Nordrhein-Westfalen/Eifel dre05 - FASY - ITRDB GERM177

description: Growth responses to twentieth century climate variability of the three main European tree species Fagus sylvatica, Quercus petraea, and Pinus sylvestris within two temperate low mountain forest sites were analyzed, with particular emphasis on their dependence upon ecological factors and temporal stability in the obtained relationships. While site conditions in Central (~51°N, 9°E, KEL) and West (50.5°N, 6.5°E, EIF) Germany are similar, annual precipitation totals of ~700 mm and ~1,000 mm describe a maritime-continental gradient. Ring-width samples from 228 trees were collected and PCA used to identify common growth patterns. Chronologies were developed and redundancy analysis and simple correlation coefficients calculated to detect twentieth century temperature, precipitation, and drought fingerprints in the tree-ring data. Summer drought is the dominant driver of forest productivity, but regional and species-specific differences indicate more complex influences upon tree growth. F. sylvatica reveals the highest climate sensitivity, whereas Q. petraea is most drought tolerant. Drier growth conditions in KEL result in climate sensitivity of all species, and Q. petraea shifted from non-significant to significant drought sensitivity during recent decades at EIF. Drought sensitivity dynamics of all species vary over time. An increase of drought sensitivity in tree growth was found in the wetter forest area EIF, whereas a decrease occurred in the middle of the last century for all species in the drier KEL region. Species-specific and regional differences in long-term climate sensitivities, as evidenced by temporal variability in drought sensitivity, are potential indicators for a changing climate that effects Central-West German forest growth, but meanwhile hampers a general assessment of these effects.
description: Purpose of Collection:
# climate/growth relationship NOAA Template Raw Measurements file added 2019-02-05.
DOI: 10.25921/gfg9-yx49
title: NOAA/WDS Paleoclimatology - Esper - W Norilsk - LASP - ITRDB RUSS238

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: forest enclaves within the subarctic tundra; saplings and trees
# # # wind ecotone, forest boundary
# # # Problem 1833 bei Norilsk: Das Jahr 1833 war nur beim Baum 15 ?sichtbar? .
# # # Dieser war zu dieser Zeit relativ jung und zeigt deshalb anderes 
# # # Wachstumsverhalten als es die Mittelkurve zeigt.
# # # Formerly NOR NOAA Template Raw Measurements file added 2019-04-08.
DOI: 10.25921/gbge-sk15
title: NOAA/WDS Paleoclimatology - Global and Zonal 200 Year Multiproxy Temperature Reconstructions

description: Stable global temperatures of the last 10-15 years have been a topic of considerable discussion. A new proxy extension of the global temperature record enables better placement of this feature in a longer historical perspective. The fixed-grid composite covers the interval 1801-1984, with an extension to 1782, and anchors the global temperature record in the last major cold interval of the Little Ice Age, when carbon dioxide concentration was at preanthropogenic levels. Except for greater and longer cooling (approximately twice the length of Pinatubo) associated with the Tambora eruption, the proxy agrees with the most widely cited previous assessment of global temperature over this interval, lending more confidence to a centennial extension of the global temperature record. The proxy correlation is as high as 0.83 for the interval 1907-1984 (df = 8, p = 0.001), with the 21st century 1.0°C ± 0.2°C warmer than the nonvolcanic base state. This remarkable linearity requires a clear theoretical understanding as to how an exceedingly complex system can, on the global average, behave in such a simple way. Removal of the linear radiatively forced component from the global temperature record yields an estimate of natural variability for the last 230 years and indicates no unusual natural variability during the recent 10-15 years. Based on the estimate of unforced variability over the last 170 years, there is about a 40% chance of continued "natural cooling" over the next few years, with about a 10% chance of cooling persisting into the next decade.
description: Fixed-grid global and zonal multi-proxy temperature reconstructions from 1782 to 1984.
DOI: 10.15468/dl.6vcjf2
title: Occurrence Download

description: A dataset containing 938 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Gastropoda)",
 "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((150 0,160 0,160 10,150 10,150 0))"
 ]
}

 The dataset includes 938 records from 13 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0020817-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/gmar-r972
title: NOAA/WDS Paleoclimatology - Allen - Butters - LGFR - ITRDB AUSL036

description: We have produced the first annually resolved, centennial-length tree-ring chronologies, based on tracheid radial diameter (TRD) and microfibril angle for south-eastern Australia (SEA) from what would commonly be considered a dendroclimatically suboptimal site. The chronologies exhibit a strong regional temperature signal for the austral summer (nominally November-April) that extends across much of SEA. The strength and spatial extent of the temperature-TRD correlations surpass those between the iconic Tasmanian Mt Read ring-width chronology and austral summer temperatures, and are more time-stable. We demonstrate that the value of wood property chronologies for their ability to improve the both the quality and the quantity of highly climate-sensitive series available for regional annual-resolution climate reconstructions, in data-sparse regions in Australasia and beyond, should be examined. In light of the 'divergence debate', the time-stability of relationships with climate, relative to other tree-ring proxies, also requires further investigation.
description: Wood properties data including average microfibril angle (ausl036f.rwl), average cell wall thickness (ausl036c.rwl), average trachedi radial diameter (ausl036w.rwl), and average density (ausl036d.rwl). Data collected for investigative purposes.  Contains strong temperature signal, also a weaker streamflow signal present.  NOAA Template Raw Measurements file added 2019-02-01.
DOI: 10.25921/gkn7-vg25
title: NOAA/WDS Paleoclimatology - North Atlantic Oscillation 1000 Year Model-Tested Reconstruction

description: The North Atlantic Oscillation (NAO) is the major source of variability in winter atmospheric circulation in the Northern Hemisphere, with large impacts on temperature, precipitation and storm tracks, and therefore also on strategic sectors such as insurance, renewable energy production, crop yields and water management. Recent developments in dynamical methods offer promise to improve seasonal NAO predictions, but assessing potential predictability on multi-annual timescales requires documentation of past low-frequency variability in the NAO. A recent bi-proxy NAO reconstruction spanning the past millennium suggested that long-lasting positive NAO conditions were established during medieval times, explaining the particularly warm conditions in Europe during this period; however, these conclusions are debated. Here, we present a yearly NAO reconstruction for the past millennium, based on an initial selection of 48 annually resolved proxy records distributed around the Atlantic Ocean and built through an ensemble of multivariate regressions. We validate the approach in six past-millennium climate simulations, and show that our reconstruction outperforms the bi-proxy index. The final reconstruction shows no persistent positive NAO during the medieval period, but suggests that positive phases were dominant during the thirteenth and fourteenth centuries. The reconstruction also reveals that a positive NAO emerges two years after strong volcanic eruptions, consistent with results obtained from models and satellite observations for the Mt Pinatubo eruption in the Philippines.
description: This is a new reconstruction of North Atlantic Oscillation evolution during the last millennium.  It has been produced by generating an ensemble of 100 different multi-proxy reconstructions, each one calibrated over a different time period. In each case, the final selection of proxies is constrained through the use of reanalyses and last millennium model simulations.  For additional information about the data and the methodology please refer to Ortega et al. 2015. 
Provided Keywords: Last millennium, North Atlantic Oscillation, Perfect Model Analysis
DOI: 10.25921/gdb5-qy65
title: NOAA/WDS Paleoclimatology - Steel Lake, Minnesota 3,100 Year Calcite Oxygen Isotope Data

description: Paleorecords are key for evaluating the long-term patterns and controls of drought. We analyzed calcite in annually laminated sediments from a Minnesota lake for oxygen-isotopic composition (d18O). The d18O record of the past ~3100 years reveals that droughts of greater severity and duration than during the 20th century occurred repeatedly, especially prior to 300 AD. Drought variability was anomalously low during the 20th century; ~90% of the variability values during the last 3100 years were greater than the 20th-century average. d18O is strongly correlated with the index of the Pacific Decadal Oscillation (PDO) during the past 100 years, and periodicities of the late-Holocene d18O record are similar to those of the PDO.  Furthermore, time series of d18O and atmospheric D14C are generally coherent after 700 AD. Both the Pacific climate and solar irradiance probably played a role in drought occurrence, but their effects were non-stationary through the late Holocene.
description: High-resolution record of calcite d18O from Steel Lake, north-central Minnesota, USA.
DOI: 10.25921/gkkq-b461
title: NOAA/WDS Paleoclimatology - European Holocene Pollen-based Gridded Climate Reconstruction

description: We present a new gridded climate reconstruction for Europe for the last 12,000 years based on pollen data. The reconstruction is an update of Davis et al. (2003) using the same methodology, but with a greatly expanded fossil and surface-sample dataset and more rigorous quality-control. The modern pollen dataset has been increased by more than 80%, and the fossil pollen dataset by more than 50%, representing almost 60,000 individual pollen samples. The climate parameters reconstructed include summer/winter and annual temperatures and precipitation, as well as a measure of moisture balance, and growing degree-days above 5 °C. Confidence limits were established for the reconstruction based on transfer function and interpolation uncertainties. The reconstruction takes account of post-glacial isostatic readjustment which resulted in a potential warming bias of up to +1-2°C for parts of Fennoscandia in the early Holocene, as well as changes in palaeogeography resulting from decaying ice sheets and rising post-glacial sea-levels. This new dataset has been evaluated against previously published independent quantitative climate reconstructions from a variety of archives on a site-by-site basis across Europe. The results of this comparison are generally very good; only chironomid-based reconstructions showed substantial differences with our values. Our reconstruction is available for download as gridded maps throughout the Holocene on a 1000-year time-step. The gridded format makes our reconstructions suitable for comparison with climate model output and for other applications such as vegetation and land-use modelling. Our new climate reconstruction suggests that warming in Europe during the mid-Holocene was greater in winter than in summer, an apparent paradox that is not consistent with current climate model simulations and traditional interpretations of Milankovitch theory.
description: EPOCH-2 (European POllen Climate Holocene, Version 2) data set.  Gridded pollen-based climate anomalies reconstruction for Europe.  Parameters include Growing degree-days above 5C (GDD5), Annual temperature (TANN), Annual precipitation (PANN), Summer temperature (TJJA), Summer precipitation (PJJA), Winter temperature (TDJF), Winter precipitation (PDJF), Ratio actual/potential evapotranspiration (alpha), and Precipitation-Evaporation (P-E). Reconstructions are presented at a 1 degree spatial resolution and 1000 year time-step from preindustrial time.
DOI: 10.15468/dl.egen6y
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Monoplacophora)",
 "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((-90 -10,-80 -10,-80 0,-90 0,-90 -10))"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0020815-251009101135966/datasets/export for details.
DOI: 10.25921/ge4n-g458
title: NOAA/WDS Paleoclimatology - Sawtooth Lake, Ellesmere Island 400 Year Varved Sediment Data

description: We obtained quantitative multivariate data from each varve of a minerogenic lacustrine sequence from the Canadian High Arctic, using an image analysis technique applied to thin-sections. The information on each varve from the uppermost core section was compared with a 35 yr meteorological dataset. Snowmelt intensity, which is an index reflecting the energy available for sediment transport, correlates well with the median grain-size measured for each varve, as well as with the weight of the 10-20 and 20-60 um fractions. The proportion of fine silt also correlates with low intensity summer precipitation. This methodology allows us to decipher the climatic control on sedimentary processes and yield a new perspective for constructing models which link climate to sediments that contain few biological remains. This model can then be used to infer paleoclimate with annual resolution from the downcore grain-size analysis.
description: Lamination thickness measured on enlarged digital photo of sediment thin-sections using a utility described in Francus et al. (2002). We estimate the precision of the measurements at about 0.04 mm.