cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/b80t-m484
title: NOAA/WDS Paleoclimatology - Jacoby - Kotuikan River - LAGM - ITRDB RUSS217

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 2019-04-08. 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/brc5-f846
title: NOAA/WDS Paleoclimatology - Solomina - Nog, Kamchatka - LAGM - ITRDB RUSS212

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/bwv5-w530
title: NOAA/WDS Paleoclimatology - Jacoby - Polar Urals LDEO - LASI - ITRDB RUSS220

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 2019-04-08. 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/bphw-5w48
title: NOAA/WDS Paleoclimatology - Perch and Dimple Lakes, Alaska 5000 Year Charcoal Data

description: Recent climatic warming has resulted in pronounced environmental changes in the Arctic, including shrub cover expansion and sea ice shrinkage. These changes foreshadow more dramatic impacts that will occur if the warming trend continues. Among the major challenges in anticipating these impacts are "surprises" stemming from changes in system components that have remained relatively stable in the historic record. Tundra burning is potentially one such component. Here we report paleoecological evidence showing that recent tundra burning is unprecedented in the central Alaskan Arctic within the last 5000 years. Analysis of lake sediment cores reveals peak values of charcoal accumulation corresponding to the Anaktuvuk River Fire in 2007, with no evidence of other fire events throughout the past five millennia in that area. Atmospheric reanalysis suggests that the fire was favored by exceptionally warm and dry weather conditions in summer and early autumn. Boosted regression tree modeling shows that such conditions also explain 95% of the interannual variability in tundra area burned throughout Alaska over the past 60 years and that the response of tundra burning to climatic warming is nonlinear. These results contribute to an emerging body of evidence suggesting that tundra ecosystems can burn more frequently under suitable climatic and fuel conditions. The Anaktuvuk River Fire coincides with extreme sea ice retreat, and tundra area burned in Alaska is moderately correlated with sea ice extent from 1979 to 2009 (r = -0.43, p = 0.02). Recurrences of large tundra fires as a result of sea ice disappearance may represent a novel manifestation of coupled marine-terrestrial responses to climatic warming.
description: Chronology, magnetic susceptibility, and macrosopic charcoal (number of pieces >180 microns) from sediments of Dimple and Perch Lakes, North Slope, Alaska. Also included are modern and reanalysis data used to generate Figures 2a, 2b, 3, and 4a of Hu et al. 2010.
DOI: 10.25921/bgvh-nb23
title: NOAA/WDS Paleoclimatology - Bond et al. 2001 North Atlantic Holocene Drift Ice Proxy Data

description: Surface winds and surface ocean hydrography in the subpolar North Atlantic appear to have been influenced by variations in solar output through the entire Holocene. The evidence comes from a close correlation between inferred changes in production rates of the cosmogenic nuclides carbon-14 and beryllium-10 and centennial to millennial time scale changes in proxies of drift ice measured in deep-sea sediment cores. A solar forcing mechanism therefore may underlie at least the Holocene segment of the North Atlantic's “1500-year” cycle. The surface hydrographic changes may have affected production of North Atlantic Deep Water, potentially providing an additional mechanism for amplifying the solar signals and transmitting them globally.
DOI: 10.25921/btbf-y606
title: NOAA/WDS Paleoclimatology - Trouet and Taylor 2009 Winter PNA Reconstruction

description: We here present a reconstruction (1725–1999) of the winter Pacific North American (PNA) pattern based on three winter climate sensitive tree ring records from the western USA. Positive PNA phases in our record are associated with warm phases of ENSO and PDO and the reorganization of the PNA pattern towards a positive mode is strongest when ENSO and PDO are in phase. Regime shifts in our PNA record correspond to climatic shifts in other proxies of Pacific climate variability, including two well-documented shifts in the instrumental period (1976 and 1923). The correspondence breaks down in the early 19th century, when our record shows a prolonged period of positive PNA, with a peak in 1800–1820. This period corresponds to a period of low solar activity (Dalton Minimum), suggesting a ‘positive PNA like’ response to decreased solar irradiance. The distinct 30-year periodicity that dominates the PNA reconstruction in the 18th century and again from 1875 onwards is disrupted during this period.
description: Winter Pacific North American (PNA) pattern reconstruction 1725-1999, based on three tree ring chronologies from the International Tree Ring Data Bank (ITRDB): North Fork Ridge (ITRDB MT111) 45N 111W, Mount Everts (ITRDB WY027) 44N 110W, Fish Trap (ITRDB AK086) 60N 154W
DOI: 10.25921/bdpn-yq05
title: NOAA/WDS Paleoclimatology - Kaufman et al. 2009 2,000 Year Arctic Temperature Synthesis

description: The temperature history of the first millennium C.E. is sparsely documented, especially in the Arctic. We present a synthesis of decadally resolved proxy temperature records from poleward of 60°N covering the past 2000 years, which indicates that a pervasive cooling in progress 2000 years ago continued through the Middle Ages and into the Little Ice Age. A 2000-year transient climate simulation with the Community Climate System Model shows the same temperature sensitivity to changes in insolation as does our proxy reconstruction, supporting the inference that this long-term trend was caused by the steady orbitally driven reduction in summer insolation. The cooling trend was reversed during the 20th century, with four of the five warmest decades of our 2000-year-long reconstruction occurring between 1950 and 2000.
DOI: 10.15468/dl.gkry7y
title: Occurrence Download

description: A dataset containing 165 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is one of (Material citation, Specimen)",
 "Country is Mexico",
 "OccurrenceStatus is Present",
 "TaxonKey is Aristolochia pentandra"
 ]
}

 The dataset includes 165 records from 33 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0006187-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/bmns-8m37
title: NOAA/WDS Paleoclimatology - Thornalley et al. 2010 North Atlantic RAPiD Deglacial Paired Mg/Ca-d18O and d18Osw-SST Reconstructions

description: Greenland ice core records indicate that the last deglaciation (~7-21 ka) was punctuated by numerous abrupt climate reversals involving temperature changes of up to 5°C-10°C within decades. However, the cause behind many of these events is uncertain. A likely candidate may have been the input of deglacial meltwater, from the Laurentide ice sheet (LIS), to the high-latitude North Atlantic, which disrupted ocean circulation and triggered cooling. Yet the direct evidence of meltwater input for many of these events has so far remained undetected. In this study, we use the geochemistry (paired Mg/Ca-d18O) of planktonic foraminifera from a sediment core south of Iceland to reconstruct the input of freshwater to the northern North Atlantic during abrupt deglacial climate change. Our record can be placed on the same timescale as ice cores and therefore provides a direct comparison between the timing of freshwater input and climate variability. Meltwater events coincide with the onset of numerous cold intervals, including the Older Dryas (14.0 ka), two events during the Allerød (at ~13.1 and 13.6 ka), the Younger Dryas (12.9 ka), and the 8.2 ka event, supporting a causal link between these abrupt climate changes and meltwater input. During the Bølling-Allerød warm interval, we find that periods of warming are associated with an increased meltwater flux to the northern North Atlantic, which in turn induces abrupt cooling, a cessation in meltwater input, and eventual climate recovery. This implies that feedback between climate and meltwater input produced a highly variable climate. A comparison to published data sets suggests that this feedback likely included fluctuations in the southern margin of the LIS causing rerouting of LIS meltwater between southern and eastern drainage outlets, as proposed by Clark et al. (2001).
DOI: 10.25921/bnmy-3y90
title: NOAA/WDS Paleoclimatology - Lake Linne', Spitsbergen 20th Century Varved Sediment Data

description: Core C2-05 proxy data and varve thickness from Lake Linne', west coast of Spitsbergen, Svalbard, Norway. Lake Linneŋ, located on the west coast of Spitsbergen Svalbard, was cored in 2005 to evaluate the varve record of the proximal sub-basin located at the south end of the lake.  This core site was thought to be the most sensitive to changes in sediment flux of the main inflow meltwater stream and would thereby yield a sensitive record of up-valley glacier activity.  The recovered core was measure for magnetic susceptibility (ms), organic matter content (LOI), carbonate content, and sampled for Cs-137 activity. Varve thickness measurements were made between 1963 and 2004 and compared with climate data from the Longyearbyen airport for the same interval.  Lamination thickness varied from 2.0 to 12.6mm in the 60 cm long core and annual sedimentation since the '63/'64 Cs spike averaged 4.5 mm per year.  Bulk density varied from 1.1 g/cc to 1.6 g/cc, LOI varied from 5 to 9% and carbonate content ranges from 2.5 to 8.5%.  The Cesium activity profile shows a peak ('63/'64) at 18.5 cm core depth.  Annual lamination thickness was related to summer average temperature, annual precipitation and glacier mass balance (Midre Lovenbreen - NyAlesund) for the interval 1963 to 2005.  Lamination thickness showed a poor relationship with each of the climate parameters, suggesting that other factors are complicating the relationships between climate and lamination thickness.  More recent work based on annual (and spring) sediment trap records suggests that annual laminations can often be complex due to sediment transport during the spring-nival melt event.  In particular, the ""intensity"" of the spring melt event which directly influences stream discharge (and thereby stream capacity and competence) appears to be the main factor influencing deposition of the annual coarse grained material.  This research suggest that there may not be a direct link between glacier mass balance and varve thickness in high Arctic lakes and that glacier-fed lakes having long intervening fluvial systems should be avoided when using lamination thickness to reconstruct past climates. Further, core locations too close to the inflow stream may contain complex lamination stratigraphies due to ""with-in lake"" sedimentation distribution processes.
description: Core C2-05 proxy data and varve thickness from Lake Linne', west coast of Spitsbergen, Svalbard, Norway.
DOI: 10.25921/bevy-ac73
title: NOAA/WDS Paleoclimatology - Wiles - Beasley Creek - TSME - ITRDB AK092

description: Tree ring data from the International Tree Ring Data Bank and World Data Center for Paleoclimatology archives.  Most data sets include raw treering measurements (most are annual ring width, with some collections of earlywood or latewood width or wood density), plus chronologies (standardized growth indices for a site compiled from multiple treering samples). Reconstructions of climate variables are included with some of these data sets.  Each data type is stored in a separate data file; the data type is coded into the file name. For details please see: http://www.ncdc.noaa.gov/paleo/treeinfo.htmll
description: NOAA Template Chronology file added 2018-12-20. NOAA Template Raw Measurements file added 2019-02-08.
DOI: 10.25921/batp-tf36
title: NOAA/WDS Paleoclimatology - Lake Tanganyika Late Holocene Diatom-inferred Conductivity Data

description: A nearshore core (LT03-05) from the north basin of Lake Tanganyika provides diatom, pollen, and sedimentary time series covering the last ca. 3800 yr at 15–36 yr resolution. A chronology supported by 21 AMS dates on terrestrial and lacustrine materials allows us to account for ancient carbon effects on 14C ages and to propose refinements of the region's climatic history. Conditions drier than those of today were followed after ca. 3.30 ka by an overall wetting trend. Several century-scale climate variations were superimposed upon that trend, with exceptionally rainy conditions occurring 1.70–1.40 ka, 1.15–0.90 ka, 0.70–0.55 ka, and 0.35–0.20 ka. Around 0.55–0.35 ka, during the Spörer sunspot minimum, drier conditions developed in the northern Tanganyika basin while more humid conditions were registered at Lakes Victoria and Naivasha. This indicates significant variability in the nature and distribution of near-equatorial rainfall anomalies during much of the Little Ice Age.
description: Transfer function analysis of the LT03-05 diatom record produced a 
reconstruction of lake water conductivity that is believed to represent 
rainfall-driven dilution of the lake surface (lower conductivity = more 
rainfall/less evaporation/more river discharge into the lake).
DOI: 10.25921/bkt4-2r23
title: NOAA/WDS Paleoclimatology - Kelly fire data from Latitude Lake, Yukon Flats, Alaska - IMPD USLTL008

description: Wildfire activity in boreal forests is anticipated to increase dramatically, with far-reaching ecological and socioeconomic consequences. Paleorecords are indispensible for elucidating boreal fire regime dynamics under changing climate, because fire return intervals and successional cycles in these ecosystems occur over decadal to centennial timescales. We present charcoal records from 14 lakes in the Yukon Flats of interior Alaska, one of the most flammable ecoregions of the boreal forest biome, to infer causes and consequences of fire regime change over the past 10,000 y. Strong correspondence between charcoal-inferred and observational fire records shows the fidelity of sedimentary charcoal records as archives of past fire regimes. Fire frequency and area burned increased ~6,000–3,000 y ago, probably as a result of elevated landscape flammability associated with increased Picea mariana in the regional vegetation. During the Medieval Climate Anomaly (MCA; ~1,000–500 cal B.P.), the period most similar to recent decades, warm and dry climatic conditions resulted in peak biomass burning, but severe fires favored less-flammable deciduous vegetation, such that fire frequency remained relatively stationary. These results suggest that boreal forests can sustain high severity fire regimes for centuries under warm and dry conditions, with vegetation feedbacks modulating climate–fire linkages. The apparent limit to MCA burning has been surpassed by the regional fire regime of recent decades, which is characterized by exceptionally high fire frequency and biomass burning. This extreme combination suggests a transition to a unique regime of unprecedented fire activity. However, vegetation dynamics similar to feedbacks that occurred during the MCA may stabilize the fire regime, despite additional warming.
description: Chronology and macroscopic charcoal counts (number of pieces >180 microns) from Chopper Lake sediments Yukon Flats, Alaska; 
Entity name, LD08 (Internal lab code); 
Contact person, Kelly R.; 
Sampling date, 2008-0718;
Sampling device, All cores were taken with a combination of 7.5 cm livingstone, 5 cm livingstone, and 7.5 cm polycarbonate tube;
Water depth(cm), 420;
Sample storage, All cores have archive halves intact, and working halves sliced at 0.25-cm resolution. These are kept at 4°C in the Hu Lab, University of Illinois, Urbana.;
Analysis method, Macroscopic charcoal counts. Please see Kelly et al. 2013 for details;
DOI: 10.25921/b0kz-x562
title: NOAA/WDS Paleoclimatology - Non-linear Holocene climate evolution in the North Atlantic: a high resolution, multi-proxy record of glacier activity and environmental change from Hvitarvatn, central Iceland

description: Iceland is well situated to monitor North Atlantic Holocene climate variability. Terrestrial sites there offer the potential for well-dated, high-resolution, continuous records of environmental change and/or glacier activity. Laminated sediments from the proglacial lake Hvítárvatn provide a continuous record of environmental change and the development of the adjacent Langjökull ice cap for the past 10.2 ka. Replicate lake sediment cores, collected from multiple locations in the basin, are placed in a secure geochronology by splicing a varve chronology for the past 3 ka with a tephra-constrained, paleomagnetic secular variation derived chronology for older sediments. Multiple proxies, including sedimentation rate, bulk density, ice-rafted debris, sediment organic matter, biogenic silica, and diatom abundance, allow annual to multi-decadal resolution and reveal a dynamic Holocene terrestrial climate. Following regional deglaciation of the main Iceland Ice Sheet, summer temperatures were high enough that mountain ice caps had already melted, or were contributing insignificant sediment to the lake. Pronounced increases in sedimentation rate, sediment density, and the influx of terrestrial organic matter, between 8.7 and 7.9 ka suggest early Holocene warmth was interrupted by two distinct pulses of cold summers leading to widespread landscape destabilization and possibly glacier growth. The Holocene thermal maximum (HTM; 7.9 to 5.5 ka) was characterized by high within-lake productivity and ice-free conditions in the watershed. Neoglaciation is recorded as a non-linear transition toward cooler summers, landscape destabilization, and the inception and expansion of Langjökull beginning ca 5.5 ka, with notable increases in ice cap size and landscape instability at 4.2 and 3.0 ka. The past two millennia are characterized by the abrupt onset of sustained cold periods at ca 550 and 1250 AD, separated by an interval of relative warmth from ca 950 to 1150 AD. The greatest Holocene extent of Langjökull occurred in the nineteenth century and is coincident with peak landscape instability, followed by ice recession throughout the twentieth century.
DOI: 10.25921/bkww-3e57
title: NOAA/WDS Paleoclimatology - Carleton Lake, Northwest Territories 6000yr Chironomid-inferred Temperature

description: We analyzed subfossil chironomids, sediment organic matter and sediment particle size data from a 1.11-m-long freeze core collected from Carleton Lake (unofficial name), located approximately 120 km north of the modern treeline. This well-dated core spans the last ca. 6,500 years. Two chironomid transfer functions were applied to infer mean July air temperatures. Our results indicated that the chironomid-inferred temperatures from this lake sediment record did not pass a significance test, suggesting that other factors in addition to temperature may have been important in structuring the chironomid community through time. Although not statistically significant, the chironomid-inferred temperatures from this site do follow a familiar pattern, with highest inferred temperatures occurring during the Holocene Thermal Maximum (~6-4 cal kyr BP), followed by a long-term cooling trend, which is reversed during the last 600 years. The largest change in the chironomid assemblage, which occurred between ca. 4,600 and 3,900 cal yr BP is possibly related to the well-documented northward advance and subsequent retreat of treeline in this region.
description: Fossil midges were processed following methods given in Walker (2001).  Mean July air temperatures were estimated using two separate transfer function models developed by Barley et al. (2006) and Porinchu et al. (2009).
DOI: 10.25921/b584-yk25
title: NOAA/WDS Paleoclimatology - Graybill - Hermit Lake - PIAR - CO525, PAGES North America 2K Version

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: 10.15468/dl.9pbzkp
title: Occurrence Download

description: A dataset containing 7926 species occurrences available in GBIF matching the query:
{
 "and" : [
 "Continent is Africa",
 "TaxonKey is Detarium microcarpum",
 "Year 1980-2025"
 ]
}

 The dataset includes 7926 records from 96 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0006188-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.