cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/231x-3q02
title: NOAA/WDS Paleoclimatology - Axelson - Grangarde, Dalarna - PISY - ITRDB SWED335

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: Samples collected for various history-related reasons during the last two decades, and grouped to represent two different altitudes (Grangarde [SWED335] 155-250m, and Safsnas [SWED336] 300-480m). The trees react on T and P signals in a complex way in this area; the lower altitude group correlates better towards southern Scandinavia and the higher better towards north. NOAA Template Raw Measurements file added 2021-02-22.
DOI: 10.25921/2ae2-f862
title: NOAA/WDS Paleoclimatology - Reed - Sierra National Forest - CADE - ITRDB CA700

description: Tree mortality associated with drought and concurrent bark beetle outbreaks is expected to increase with further climate change. When these two types of disturbance occur in concert it complicates our ability to accurately predict future forest mortality. The recent extreme California USA drought and bark beetle outbreaks resulted in extensive tree mortality and provides a unique opportunity to examine questions of why some trees die while others survive these co-occurring disturbances. We use plot-level data combined with a three-proxy tree-level approach using radial growth, carbon isotopes, and resin duct metrics to evaluate 1) whether variability in stand structure, tree growth or size, carbon isotope discrimination, or defenses precede mortality, 2) how relationships between these proxies differ for surviving and now-dead trees, and 3) whether generalizable risk factors for tree mortality exist across pinyon pine (Pinus monophylla), ponderosa pine (P. ponderosa), white fir (Abies concolor), and incense cedar (Calocedrus decurrens) affected by the combination of drought and beetle outbreaks. We find that risk factors associated with mortality differ between species, and that few generalizable patterns exist when bark beetle outbreaks occur in concert with a particularly long, hot drought. We see evidence that both long-term differences in physiology and shorter-term beetle-related selection and variability in defenses influence mortality susceptibility for ponderosa pine, whereas beetle dynamics may play a more prominent role in mortality patterns for white fir and pinyon pine. In contrast, incense cedar mortality appears to be attributable to long-term effects of growth suppression. Risk factors that predispose some trees to drought and beetle-related mortality likely reflect species-specific strategies for dealing with these particular disturbance types. The combined influence of beetles and drought necessitates the consideration of multiple, species-specific risk factors to more accurately model forest mortality in the face of similar extreme events more likely under future climates.
description: NOAA Template Raw Measurements file added 2020-09-03.
DOI: 10.25921/254r-9e98
title: NOAA/WDS Paleoclimatology - Klesse - Spasskaya Pad - LAGM - ITRDB RUSS297

description: Partitioned estimates of the boreal forest carbon (C) sink components are crucial for understanding processes and developing science-driven adaptation and mitigation strategies under climate change. Here, we provide a concise tree-centered overview of the boreal forest C balance and offer a circumpolar perspective on the contribution of trees to boreal forest C dynamics. We combine an ant’s-eye view, based on quantitative in situ observations of C balance, with a bird’s-eye perspective on C dynamics across the circumboreal region using large-scale data sets. We conclude with an outlook addressing the trajectories of the circumboreal C dynamics in response to projected environmental changes.
description: Cores were collected beneath the flux tower of the Spasskaya Pad Scientific Forest Station near Yakutsk, Russia. All trees within a 14m radius were tagged, recorded and cored, yet some were too decayed or suppressed to yield useable tree-ring records. Only the good trees are included here, 2 cores averaged to the tree level. For the full dataset, including metadata about tree size and relative location, contact Stefan Klesse NOAA Template Raw Measurements file added 2021-10-19.
DOI: 10.25921/2whb-m896
title: NOAA/WDS Paleoclimatology - Palmyra Atoll Porites spp. d18O and Sr/Ca Data from 1982-2010 CE

description: Quantitative estimates of natural climate variability are required to detect anthropogenic climate trends in the tropical Pacific; however, instrumental records from this region are too short and scarce. Coral oxygen isotopic (d18O) and strontium to calcium (Sr/Ca) records are often used to extend instrumental observations; however, differences in the mean Sr/Ca and d18O values of Porites spp. colonies from the same reef can introduce large uncertainties in coral-based climate reconstructions. To quantify intercolony variability at Palmyra Atoll, we generate monthly resolved Sr/Ca and d18O time series from five Porites spp. colonies that grew between 1980 and 2010. Monthly to interannual variability in Sr/Ca and d18O is well-reproduced among different colonies; however, we document intercolony offsets in mean Sr/Ca of ±0.09 mmol/mol (1s) or ~1 °C, and in mean d18O of ±0.12‰ (1s) or ~0.1 °C. The sensitivity of each proxy to climate also varies across colonies, with Sr/Ca-SST slopes ranging from -0.06 to -0.1 mmol mol-1 °C-1 and d18O-SST slopes ranging from -0.25 to -0.35‰ °C-1. Intercolony variability in both coral Sr/Ca and d18O reduces the reproducibility of coral-based d18Osw reconstructions across overlapping colonies. Accounting for both intercolony variability and slope error suggests that SST reconstructions using Sr/Ca from a single Palmyra coral have an uncertainty of ±1.3 °C (1s); however, replicating Sr/Ca records across multiple colonies can greatly reduce this uncertainty. A composite Sr/Ca record built using five modern cores, for example, offers a reduced error of ±0.6 °C (1s) in mean SST reconstructions, ~2.5 times smaller than errors associated with reconstructions from single corals.
DOI: 10.25921/2vhg-5283
title: NOAA/WDS Paleoclimatology - Larson - White Pine Hollow Update - QUAL - ITRDB IA037

description: New and updated multi-century tree-ring chronologies from living oak trees, remnants, and archeological beams from across the Driftless Area of southwest Wisconsin and northeast Iowa, USA, were developed to fill a spatial gap in the network of available tree-ring chronologies. We produced a robust 303-year summer drought reconstruction (June-August Palmer's Modified Drought Index (PMDI): r2 = 0.45) that identified clusters of extreme droughts and pluvials (PMDI <= -4.0 or >= 4.0) in the early 1700s and more even distributions of drought conditions, with the exception of the post 1930s period when drought became relatively infrequent. Compared to the Living Blended Drought Atlas (LBDA) and the North American Drought Atlas (NADA), our reconstruction more accurately represented moderate moisture conditions across the Driftless Area, the NADA and LBDA more closely represented extreme pluvials, and our reconstruction and the LBDA better represented extreme drought years. The three reconstructions largely captured the same high-frequency variability in drought conditions and differed most at low frequencies. Significant correlations were identified between our reconstruction and corn (r = 0.30, n = 91, p = 0.002) and soybean (r = 0.25, n  = 81, p = 0.012) yields, with the strength of the correlations increasing over recent decades suggesting a tighter coupling of interannual climate variability and crop productivity in the region. Superposed epoch analyses indicated significantly wetter conditions in the Driftless Area two years after major volcanic eruptions. In the context of long-term climatic variability, the Driftless Oaks drought reconstruction demonstrated that drought and pluvial conditions more extreme than those experienced during the instrumental record have occurred in the past.
description: Oak ring width data from the Driftless Area of southwest Wisconsin and northeast Iowa, USA, sampled from living oak trees, remnants, and archeological beams.
DOI: 10.25921/2w6c-6d87
title: NOAA/WDS Paleoclimatology - Horseshoe Lake, Illinois 1,500 Year Stable Isotope Data

description: Drought has long been suspected as playing an important role in the abandonment of pre-Columbian Native American settlements across the midcontinental United States between 1350 and 1450 CE. However, high-resolution paleoclimatic reconstructions reflecting local effective moisture (the ratio of precipitation to evaporation) that are located in proximity to Mississippi period (1050-1450 CE) population centers are lacking. Here, we present a 1600-year-long decadally resolved oxygen isotope (d18O) record from Horseshoe Lake (Collinsville, IL), an evaporatively influenced oxbow lake that is centrally located within the largest and mostly densely populated series of Mississippian settlements known as Greater Cahokia. A shift to higher d18O in the Horseshoe Lake sediment record from 1200 to 1400 CE indicates that strongly evaporative conditions (i.e., low effective moisture) were persistent during the leadup to Cahokia's abandonment. These results support the hypothesis that climate, and drought specifically, strongly impacted agriculturally based pre-Columbian Native American cultures in the midcontinental US and highlights the susceptibility of this region, presently a global food production center, to hydroclimate extremes.
description: Stable isotope (d18O and d13C) data from calcite in sediments collected in Horseshoe Lake, Illinois, for the past 1,500 years
DOI: 10.25921/2s4e-6330
title: NOAA/WDS Paleoclimatology - Čada - Havraní skály - PCAB - ITRDB SVK008

description: Extreme tree growth reductions represent events of abrupt forest productivity decline and carbon sequestration reduction. An increase in their magnitude can represent an early warning signal of impending tree mortality. Yet the long-term trends in extreme growth reductions remain largely unknown. We analyzed the trends in the proportion of trees exhibiting extreme growth reductions in two Central-European conifer species - Pinus sylvestris (PISY) and Picea abies (PCAB) - between 1901 and 2018. We used a novel approach for extreme growth reduction quantification by relating their size to their mean recurrence interval. Twenty-eight sites throughout Czechia and Slovakia with 1120 ring width series representing high- and low-elevation forests were inspected for extreme growth reductions with recurrence intervals of 15 and 50 years along with their link to climatic drivers. Our results show the greatest growth reductions at low-elevation PCAB sites, indicating high vulnerability of PCAB to drought. The proportions of trees exhibiting extreme growth reductions increased over time at low-elevation PCAB, decreased recently following an abrupt increase in the 1970-1980s at high-elevation PCAB, and showed nonsignificant trends in high- and low-elevation PISY. Climatic drivers of extreme growth reductions, however, shifted over time for all site categories as the proportion of low-temperature-induced extreme growth reductions declined since the 1990s, whereas events caused by drought consistently increased in frequency during the same period. We observed higher growth volatility at the lower range of distribution compared with the upper range margin of PISY and PCAB. This will undoubtedly considerably impact tree growth and vitality as temperatures and incidence of drought in Central Europe are expected to further increase with ongoing climate change.
description: Extreme growth reductions in Central-European Pinus sylvestris (PISY) and Picea abies (PCAB). NOAA Template Raw Measurements file added 2021-12-29.
DOI: 10.25921/2nqb-cp11
title: NOAA/WDS Paleoclimatology - Lake 30, Kiritimati Geochemistry, d18O, d13C and dD Data since 700 CE

description: Hydroclimatic variability in the tropical Pacific reflects large-scale ocean-atmosphere processes that imprint on global climate, but tropical Pacific hydroclimate variability over the last millennium remains uncertain. Here we present a multi-proxy reconstruction from a lacustrine sediment record on Kiritimati Atoll that spans the last millennium. A lake salinity reconstruction from the δ2H values of total lipid extracts, combined with changes in sediment mineralogy and the stable isotopic composition of inorganic carbonates, indicate the presence of several distinct hydrologic regimes on Kiritimati, including a period of persistent aridity from 960–1030 CE, shorter episodes of aridity from 1030–1370 CE, and extreme aridity throughout the latter half of the last millennium, from 1370–1970 CE, that drove complete evaporation of the lake. A period of wetter, variable conditions defines recent decades. Compound-specific lipid biomarker δ2H values indicate that shifts in microbial community structure occurred in the past, from a community dominated by photoautotrophic and chemoautotrophic organisms in more arid periods to a more metabolically diverse community in the recent period. Comparison of this record with nearby sediment records from Washington Island reveals a similar pattern of aridity through the last millennium, followed by wetter conditions in the modern period. These coherent changes in hydroclimate in the central Pacific are inconsistent with a migration of the Pacific Intertropical Convergence Zone within these latitudes. Rather, past aridity was caused by reduced El Niño-Southern Oscillation variability, observed through the low-pass filter of lacustrine records, or by multidecadal to multi-century strengthening of the Pacific Walker Circulation.
description: Provided Keywords: last millennium, central Pacific
DOI: 10.25921/2a8y-x963
title: NOAA/WDS Paleoclimatology - Simmler - Davos Dischma Marteloskop - PCAB - ITRDB SWIT410

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: Reference: 
# Simmler K. 2017. Dendrochronological study of the structure and dynamics in a subalpine spruce-larch stand in Davos (Switzerland). Bachelor thesis. ETH Zurich. NOAA Template Raw Measurements file added 2021-05-03.
DOI: 10.25921/2ee3-np83
title: NOAA/WDS Paleoclimatology - Pecos River, New Mexico 700 Year Streamflow Reconstruction

description: The Pecos River provides an important source of water for New Mexico and Texas, US, and Mexico. Severe and prolonged drought combined with increasing temperatures during the early 21st century boosted attention on water resources and allocation management in the American West. We provide a tree-ring-based streamflow reconstruction for the Pecos River for the period 1310-2013 CE for the overarching purpose of placing the current Pecos River streamflow declines in a multi-century context. Over the past ca. 700 years, dry events (n = 93) that lasted at least 2 years were more common than wet events (n = 76), wherein flow was below/above the instrumental mean (61.6 m3 s-1). Although more prolonged droughts occurred during the 15th and 18th centuries, the gage record (1930-2013 CE) captures the full range and variability of flow extremes within the context of the past 700 years. The 11-year drought of 1772-1782 was the highest ranked based on magnitude + intensity below the instrumental mean, slightly edging out the 1415-1425 and 1950-1957 events. The driest events that have occurred from the 14th through the 20th centuries are challenged by flow conditions since the turn of the 21st century. The 2000-2006 and 2011-2013 dry periods ranked 6th and 13th, respectively, though the intensity (-40 m3 s-1 yr-1) of the 2011-2013 event exceeded all higher ranked droughts. The lowest single water-year flow in the reconstruction was shared by years 1904 and 2002, during which the flow of the Pecos River was estimated at 8.1 m3 s-1. Other extreme low-flow years were 1685 (9.5 m3 s-1) and 1579 (9.8 m3 s-1), but are eclipsed by 1904 and 2002 when considering the lower bounds of bootstrapped confidence limits of the reconstruction. Increased flow variability combined with projected increased temperatures and decreased precipitation will likely present new challenges to water resource managers, especially given impending anthropogenic climate change.
description: Tree-ring based streamflow reconstruction for the Pecos River, New Mexico, USA, for 1310-2013 CE
DOI: 10.25921/21w7-mx15
title: NOAA/WDS Paleoclimatology - Touchan - Black Mountain - SEGI - ITRDB CA719

description: The first dendroclimatic reconstruction of May 1 snow water equivalent (SWE) was developed from a Sequoiadendron giganteum regional tree-ring chronology network of 23 sites in central California for the period 90-2012 CE. The reconstruction is based on a significant relationship between May 1 SWE and tree-ring growth and shows climate variability from interannual to intercentennial time scales. A regression-based reconstruction equation explains up to 55% of the variance of SWE for 1940-2012. Split-sample validation supports our use of a reconstruction model based on the full period of reliable observational data (1940-2012). Thresholds for May 1 SWE low (15 percentile) and high (80 percentile) years were selected based on the exploratory scatterplots relationship between observed and reconstructed data for the period 1940-2012. The longest period of consecutive low-SWE years in the reconstruction is 2 years and the frequency of the lowest SWE years is highest during the period 710-809 CE. The longest high-SWE period, defined by consecutive wet years, is 3 years (558-560 CE). SWE and its reconstruction positively correlate with northeastern Pacific sea surface temperatures, the low-frequency variability of which may provide some predictive ability. Ultimately, the instrumental record and reconstruction suggest that unlike other sites in the region, twentieth century SWE variability in these Sequoia groves has remained within historical boundaries and relatively buffered from extremes and severe declines, though this is likely to change in coming decades with potentially negative effects on water availability for these trees.
description: giant sequoia NOAA Template Raw Measurements file added 2021-02-22.
DOI: 10.25921/2y6y-tc68
title: NOAA/WDS Paleoclimatology - Southeast China 145 Year December-March Temperature Reconstruction

description: Extremely cold temperatures are a significant threat to agriculture and transportation in winter in southeastern China. However, due to the shortness of instrumental records and the scarcity of long-term temperature reconstructions, more high-quality temperature reconstructions are still needed to fully examine their spatial-temporal variability over the past several centuries. In this study, we built an earlywood width (EWW) chronology, a latewood width (LWW) chronology, and a tree-ring width (TRW) chronology using tree-ring samples of Pinus taiwanensis Hayata from the western Tianmu Mountains and the Xianyu Mountains in southeastern China. The tree growth-climate relationships were analyzed, and we found the strongest correlation between December and March mean temperature and the EWW chronology. The December-March mean temperature history was then reconstructed over the period of 1871-2016 using a linear regression model, which is the first EWW-based temperature reconstruction in southeastern China. With a higher explained variance (47.0%) than that (31.7%) of a previous reconstruction using a TRW chronology, the quality of the model has largely improved. This reconstruction was also comparable with other nearby records, further demonstrating the reliability of our new model. Furthermore, our reconstruction exhibits a significantly negative relationship with the East Asian winter monsoon index (EAWMI) since the 1920s, which may be attributed to the obviously enhanced EAWMI thereafter.
description: December-March temperature reconstruction from Pinus taiwanensis earlywood width collected at 2 sites in southeastern China, for 1871-2016 CE.
DOI: 10.15468/dl.xubebv
title: Occurrence Download

description: A dataset containing 13 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Phoxinus percnurus"
 ]
}

 The dataset includes 13 records from 5 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0014540-250717081556266/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.k6c6xz
title: Occurrence Download

description: A dataset containing 1417 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Stipa barbata"
 ]
}

 The dataset includes 1417 records from 105 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0014541-250717081556266/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.sc469m
title: Occurrence Download

description: A dataset containing 808 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Centaurea diffusa",
 "Country is Canada",
 "HasCoordinate is true"
 ]
}

 The dataset includes 808 records from 19 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0014543-250717081556266/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.rrahkc
title: Occurrence Download

description: A dataset containing 2730 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Centaurea diffusa",
 "Country is United States of America",
 "HasCoordinate is true"
 ]
}

 The dataset includes 2730 records from 87 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0014542-250717081556266/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.2jdc3f
title: Occurrence Download

description: A dataset containing 11 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Moroco percnurus"
 ]
}

 The dataset includes 11 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0014545-250717081556266/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.rzpwcy
title: Occurrence Download

description: A dataset containing 680 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Thelypodium flexuosum"
 ]
}

 The dataset includes 680 records from 62 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0014544-250717081556266/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.