cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/dzav-rx86
title: NOAA/WDS Paleoclimatology - Peltier - Southwest Ecological Memory Project Site P9 - PIED - ITRDB UT559

description: Trees are long-lived organisms that integrate climate conditions across years or decades to produce secondary growth. This integration process is sometimes referred to as 'climatic memory.' While widely perceived, the physiological processes underlying this temporal integration, such as the storage and remobilization of non-structural carbohydrates (NSC), are rarely explicitly studied. This is perhaps most apparent when considering drought legacies (perturbed post-drought growth responses to climate), and the physiological mechanisms underlying these lagged responses to climatic extremes. Yet, drought legacies are likely to become more common if warming climate brings more frequent drought. To quantify the linkages between drought legacies, climate memory and NSC, we measured tree growth (via tree ring widths) and NSC concentrations in three dominant species across the southwestern USA. We analyzed these data with a hierarchical mixed effects model to evaluate the time-scales of influence of past climate (memory) on tree growth. We then evaluated the role of climate memory and the degree to which variation in NSC concentrations were related to forward-predicted growth during the hot 2011-2012 drought and subsequent 4-year recovery period. Populus tremuloides exhibited longer climatic memory compared to either Pinus edulis or Juniperus osteosperma, but following the 2011-2012 drought, P. tremuloides trees with relatively longer memory of temperature conditions showed larger (more negative) drought legacies. Conversely, Pinus edulis trees with longer temperature memory had smaller (less negative) drought legacies. For both species, higher NSC concentrations followed more negative (larger) drought legacies, though the relevant NSC fraction differed between P. tremuloides and P. edulis. Our results suggest that differences in tree NSC are also imprinted upon tree growth responses to climate across long time scales, which also underlie tree resilience to increasingly frequent drought events under climate change.
description: These tree ring data were collected to assess the climate memory of tree growth around the southwestern US in "ecologically sampled" trees. Trees were from a range of size classes and vigors, but were all dominant or co-dominant. NOAA Template Raw Measurements file added 2022-04-04.
DOI: 10.15468/dl.uwt2bp
title: Occurrence Download

description: A dataset containing 5392 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is Human Observation",
 "CoordinateUncertaintyInMeters 0.0-10000.0",
 "Geometry POLYGON((-125.43348 24.69353,-60.68077 24.69353,-60.68077 49.87376,-125.43348 49.87376,-125.43348 24.69353))",
 "TaxonKey is Bromus tectorum"
 ]
}

 The dataset includes 5392 records from 6 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0006389-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/dm2a-jb35
title: NOAA/WDS Paleoclimatology - Lake Ximencuo, China Air Temperature Reconstructions over the last 19 ka

description: (Paleo-)climatologists are challenged to identify mechanisms that cause the observed abrupt Holocene monsoon events despite the fact that monsoonal circulation is assumed to be driven by gradual insolation changes. Here we provide proxy and model evidence to show that moisture-advection feedback can lead to a non-linear relationship between sea-surface and continental temperatures and monsoonal precipitation. A pollen record from Lake Ximencuo (Nianbaoyeze Mountains) indicates that vegetation from the eastern margin of the Tibetan Plateau was characterized by alpine deserts and glacial flora after the Last Glacial Maximum (LGM) (21–15.5 cal kyr BP), by alpine meadows during the Late Glacial (15.5–10.4 cal kyr BP) and second half of the Holocene (5.0 cal kyr BP to present) and by mixed forests during the first half of the Holocene (10.4–5.0 cal kyr BP). The application of pollen-based transfer functions yields an abrupt temperature increase at 10.4 cal kyr BP and a decrease at 5.0 cal kyr BP of about 3 °C. By applying endmember modeling to grain-size data from the same sediment core we infer that frequent fluvial events (probably originating from high-magnitude precipitation events) were more common in the early and mid Holocene. We assign the inferred exceptional strong monsoonal circulation to the initiation of moisture-advection feedback, a result supported by a simple model that reproduces this feedback pattern over the same time period.
description: This dataset was contributed as part of the Temperature-12k project (https://doi.org/10.25921/4RY2-G808). Data were contributed to the project from the original data generators, who are listed in the Investigator field of this template file. Additional notes regarding the use of these data in the Temperature-12k project can be found in the LiPD file listed as an Online_Resource of this template file. Note added by Temperature-12k authors: Note 14C dates need to be corrected for reservoir effect.
DOI: 10.25921/dtev-ht06
title: NOAA/WDS Paleoclimatology - Highway 130 Lake, Wyoming 11,700 Year Stable Isotope and Carbonate Data

description: The use of the climatic anomaly known as the "4.2 ka event" as the stratigraphic division between the mid- and late Holocene has prompted debate over its impact, geographic pattern, and significance. The anomaly has primarily been described as abrupt drying, but evidence of hydroclimate change at ca. 4 ka is inconsistent among sites globally, and few sites in North America document a major drought. Climate records from the southern Rocky Mountains demonstrate the challenge with diagnosing the extent and severity of the anomaly. Dune-field chronologies and a pollen record in southeast Wyoming reveal several centuries of low moisture at around 4.2 ka and prominent low stands in lakes in Colorado suggest the drought was unique amid Holocene variability, but detailed carbonate oxygen isotope (d18Ocarb) records from Colorado do not record it. We find new evidence from d18Ocarb in a small mountain lake in southeast Wyoming of an abrupt reduction in effective moisture or snowpack from approximately 4.2-4 ka that coincides in time with the other evidence from the southern Rocky Mountains and the western Great Plains of regional drying at around 4.2 ka. We find that the d18Ocarb in our record may reflect cool-season inputs into the lake, which do not appear to track the strong enrichment of heavy oxygen by evaporation during summer months today. The modern relationship differs from some widely applied conceptual models of lake-isotope systems and may indicate reduced winter precipitation rather than enhanced evaporation at ca. 4.2 ka. Inconsistencies among the North American records, particularly in d18Ocarb trends, thus show that site-specific factors can prevent identification of the patterns of multi-century drought. However, the prominence of the drought at ca. 4 ka among a growing number of sites in the North American interior suggests it was a regionally substantial climate event amid other Holocene variability.
description: Stable isotope (d18O and d13C) data plus carbonate and organic matter concentrations from sediments collected in Highway 130 Lake, Wyoming, for the past 11,700 years.
DOI: 10.25921/d3fp-8965
title: NOAA/WDS Paleoclimatology - Boyd - Interior Alaska Aspen Site SA1032 - PPTR - ITRDB AK179

description: Climate change-driven droughts and insect outbreaks are becoming more frequent and widespread, increasing forest vulnerability to mortality. By addressing the impacts of climate and insects on tree growth preceding death, we can better understand tree mortality risk under a changing climate. Here, we used tree stature and interannual growth (basal area increment; BAI) to assess processes leading to trembling aspen (Populus tremuloides) survival or mortality during an unprecedented leaf miner (Phyllocnistis populiella) outbreak in boreal North America. We identified eight sites (22 plots) in the longest running forest monitoring network in Alaska, spanning ~350 km of latitude, that experienced >=0.25 Mg ha-1 yr-1 aspen mortality during the outbreak. We compared the size and canopy position, growth patterns, and sensitivity to climate and leaf mining of aspen that survived (living; n = 84) vs. died (dying; n = 76) and linked the normalized difference vegetation index (NDVI) to plot-level aspen growth and stand biomass recruitment, growth, and mortality. Dying aspen were in the subcanopy, smaller in diameter, and after a drought in 1957 had lower growth than living aspen until death. Before the outbreak, growth of all trees was positively influenced by moisture and negatively by temperature, but only living trees maintained this climate response during the outbreak. Leaf mining reduced growth of both groups, exerting at least a twofold greater impact than climate. The NDVI captured plot-level tree growth and stand biomass growth and mortality, yet it was nearly two times more strongly associated with living than dying tree growth and 12 times more strongly associated with biomass growth than mortality. These differences suggest that NDVI may inadequately detect insect-driven dieback and dispersed mortality of aspen across the boreal biome. Our findings reveal that a historic drought triggered a multi-decadal growth decline that predisposed aspen to mortality during the leaf miner outbreak and that while aspen growth is influenced by moisture and temperature, it is more strongly affected by P. populiella. We conclude that as the climate warms and insect outbreaks increase in frequency and magnitude at high latitudes, we should expect to see persistent and greater declines in aspen growth and increases in mortality.
description: This data file contains raw ring-width chronologies of individual trees that died (dying) and survived (living) an insect oubreak of Phyllocnistis populiella (outbreak period: 1997-2013) in Interior Alaska.  Living trees have ring-width measurements up to 2015 and the tree names are preceded by TA whereas dying tree ring-width measurements end in 1997-2013 and the tree names are preceded by TM. NOAA Template Raw Measurements file added 2021-02-22
DOI: 10.25921/dyqk-qz58
title: NOAA/WDS Paleoclimatology - Maxwell - Sheldrick Forest Preserve - TSCA - ITRDB NH010

description: Determining the response of forest growth and productivity to climate variability is crucial for understanding and modeling forest carbon sequestration in mesic temperate forests. Most tree-ring analyses have used monthly climate data. Daily climate data may be more appropriate to use in the determination of tree-ring response to climate because cell division, enlargement, and thickening occur during discrete periods of the growing season. We analyze annual tree-ring width and d13C from Tsuga canadensis (1992-2012) at ten sites in the northeastern US to test the null hypothesis that tree-ring width and d13C respond similarly to critical climate periods using daily climate data and linear regression. There was a significant difference in the climate response of ring width and d13C. Precipitation predicted both d13C and ring width with the highest r2 and greatest level of significance overall. d13C integrated climate over longer periods of the year (and previous year) than ring width at most sites. d13C showed a more consistent seasonal signal across sites for each climate variable than ring width. Our work provides a new perspective on the response of annual tree growth and d13C to climatic variability that can inform ecosystem productivity, carbon cycle, and earth system models.
description: Part of New England Hemlock Transect, 10 sites along a 500+ km transect stretching from CT to ME NOAA Template Raw Measurements file added 2021-02-22.
DOI: 10.25921/dw2q-b333
title: NOAA/WDS Paleoclimatology - Tigalmamine, Morocco Air Temperature Reconstruction during the Holocene

description: Annual precipitation, July and January temperatures were reconstructed from a continuous Holocene pollen sequence from the Middle Atlas, Morocco, using the best modern analogues method. The reconstructions show a clear difference between the early and late Holocene: from ∼10 ka to ∼6.5 ka the climate was drier and warmer than during the period since 6.5 ka. The average value of annual precipitation was ∼870 mm until 6.5 ka, then rose to ∼940 mm. Between 10 ka and 6.5 ka January and July temperatures were about 4 °C higher than the present. Both temperatures show a marked decrease between 7 ka and 6 ka. After 6.5 ka July and January temperatures fluctuated between 21 and 23 °C, and 2.5 and 5 °C respectively. January temperatures show a period of intermediate values (∼3.5 °C) between 4 ka and 5.5 ka. The reconstructed climate values generally match palaeolimnological data from the same core, which show five intervals of low lake level during the Holocene. They are also consistent with regional-scale COHMAP simulated palaeoclimate that shows contrasting patterns of rainfall variation between the northwesternmost part of Africa and the intertropical band.
description: This dataset was contributed as part of the Temperature-12k project (https://doi.org/10.25921/4RY2-G808). Data were contributed to the project from the original data generators, who are listed in the Investigator field of this template file. Additional notes regarding the use of these data in the Temperature-12k project can be found in the LiPD file listed as an Online_Resource of this template file.
DOI: 10.25921/dzek-h902
title: NOAA/WDS Paleoclimatology - Birch - Cedar Breaks National Monument - PSME - ITRDB UT548

description: Tree rings provide an invaluable long-term record for understanding how climate and other drivers shape tree growth and forest productivity. However, conventional tree-ring analysis methods were not designed to simultaneously test effects of climate, tree size, and other drivers on individual growth. This has limited the potential to test ecologically relevant hypotheses on tree growth sensitivity to environmental drivers and their interactions with tree size. Here, we develop and apply a new method to simultaneously model nonlinear effects of primary climate drivers, reconstructed tree diameter at breast height (DBH), and calendar year in generalized least squares models that account for the temporal autocorrelation inherent to each individual tree's growth. We analyze data from 3811 trees representing 40 species at 10 globally distributed sites, showing that precipitation, temperature, DBH, and calendar year have additively, and often interactively, influenced annual growth over the past 120 years. Growth responses were predominantly positive to precipitation (usually over >=3-month seasonal windows) and negative to temperature (usually maximum temperature, over <=3-month seasonal windows), with concave-down responses in 63% of relationships. Climate sensitivity commonly varied with DBH (45% of cases tested), with larger trees usually more sensitive. Trends in ring width at small DBH were linked to the light environment under which trees established, but basal area or biomass increments consistently reached maxima at intermediate DBH. Accounting for climate and DBH, growth rate declined over time for 92% of species in secondary or disturbed stands, whereas growth trends were mixed in older forests. These trends were largely attributable to stand dynamics as cohorts and stands age, which remain challenging to disentangle from global change drivers. By providing a parsimonious approach for characterizing multiple interacting drivers of tree growth, our method reveals a more complete picture of the factors influencing growth than has previously been possible.
description: Tree-ring chronologies of Pseudotsuga menziesii at Cedar Breaks National Monument (1395 - 2019). Collected from living and visibly healthy Pseudotusga menziesii within and around the Utah Forest Dynamics Plot located within Cedar Breaks National Monument, Utah, USA. Collected in July of 2018 and July of 2020. NOAA Template Raw Measurements file added 2021-02-22
DOI: 10.25921/dhe8-sy41
title: NOAA/WDS Paleoclimatology - Zepu Glacier, Southeastern Tibetan Plateau 240 Year Retreat Reconstruction

description: Glaciers on the southeastern Tibetan Plateau, known as the "Asian Water Tower", directly affect the utilization of water resources in downstream regions. The currently available instrumental climatic dataset covers only a short period, and the resolution of proxy-based climate reconstructions is low, and these limitations restrict the accurate exploration of glacial changes on the southeastern Tibetan Plateau within the context of long-term climate change. Here, annual-resolution tree ring samples were collected from the oldest pioneer trees (Hippophae rhamnoides subsp. yunnanensis), from the bottom of a glacial valley on the southeastern Tibetan Plateau, and used to reconstruct the glacial changes based on the relationship between the ages of the trees and their distances from the glacier terminal. Results indicate that Zepu glacier has been retreating since 1778 CE, with a total retreat distance of 2757 m and an average retreat rate of 11 m yr-1. The rate of retreat has varied over time, with a maximum of 40 m yr-1 between the 1950s CE and 1970s CE, and glacial retreat has been modulated mainly by temperature variability over interdecadal to centennial timescales. This study provides a new way to reconstruct the history of glacial retreat.
description: Zepu Glacier retreat rate and distance reconstruction based on tree ring samples collected from the oldest pioneer trees from the bottom of the glacial valley below Zepu glacier
DOI: 10.25921/dw2z-4c61
title: NOAA/WDS Paleoclimatology - Great Cistern Sinkhole, Bahamas 9,000 Year Calcite Raft Grain Size and XRF Data

description: Meridional shifts of the North Atlantic Subtropical High (NASH) western edge create a dipole that drives hydroclimate variability in the southeastern United States and Caribbean region. Southwest displacements suppress rainfall in the southern Caribbean. Northwest displacements drive southeast United States and northern Caribbean drying. Projections for the 21st century suggest a more meridionally displaced NASH, which jeopardizes Caribbean island communities dependent on rain-fed aquifers. While recent work indicates that Atlantic and Pacific Ocean-atmosphere variability influenced the NASH during the instrumental period, little is known about NASH behavior and subsequent hydroclimate responses over longer timescales. To address this limitation, we developed a ~6000-years long rainfall record through the analysis of calcite raft deposits archived within sediments from a coastal sinkhole in the northeast Bahamas (Abaco Island). Increased (decreased) calcite raft deposition provides evidence for increased (decreased) rainfall driven by NASH variability. We use simulations from the Community Earth System Model to support this interpretation. These simulations improve our understanding of NASH behavior on timescales congruous with the reconstruction and suggest an important role for the state of the Pacific Ocean. Furthermore, model simulations and a compilation of regional hydroclimate reconstructions reveal that the NASH-driven dipole dominates northern and southern Caribbean rainfall on centennial timescales. These results bring Holocene Caribbean hydroclimate variability into sharper focus while providing important context for present and future changes to regional climate. Additionally, this study highlights the need for improved future predictions of the state of the Pacific Ocean to best inform water scarcity mitigation strategies for at-risk Caribbean communities.
description: This dataset provides 9,000 years of variable calcite raft abundances from 3 cores collected in Great Cistern Sinkhole, inferred as a proxy of rainfall over Abaco Island, The Bahamas, plus XRF elemental analysis. Provided Keywords: NASH, calcite rafts, Holocene, coastal sinkhole, Bahamas, hydroclimate dipole
DOI: 10.15468/dl.3dnvu6
title: Occurrence Download

description: A dataset containing 134 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is Pilosocereus aurisetus"
 ]
}

 The dataset includes 134 records from 18 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0006390-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/dapx-x492
title: NOAA/WDS Paleoclimatology - Stan fire data from Youth Camp - IMPD USYC-001

description: Forests on tribal lands in the western United States have seen the return of low-intensity surface fires for several decades longer than forests on non-tribal lands. We examined the surface fire regime in a ponderosa pine-dominated (Pinus ponderosa) forest on the Hualapai tribal lands in the south-western United States. Using fire-scarred trees, we inferred temporal (frequency and seasonality) and spatial (synchrony) attributes and regulators of the fire regime over three land-use periods (historical, suppression, modern) between 1702 and 2007. Patterns of fire frequency and synchrony were similar, but fire seasonality was dissimilar, between the historical and modern periods. Logistic regression and generalised linear mixed models identified a suite of variables representing fuels, climate and human land uses that were associated with the probability of a site burning. Combined, these results allow for valuable insights regarding past fire spread and variability in fire frequency throughout our study area. In some respects, the current distinct fire regime in our study area, which predominately consists of prescribed fires implemented since the 1960s, resembles the past frequent surface fire regime that occurred here and in similar forest types on non-tribal lands in the south-western United States. Our results will be useful for informing adaptive management throughout the region as climate warms.
description: This dataset was contributed as part of the North American Tree-ring Fire Scar Synthesis (NAFSS) project (https://www.ncei.noaa.gov/access/paleo-search/study/34853). Data were contributed to the project from the original data generators.

Sample Storage Location: School of Forest Resources, Northern Arizona University
Dating Method: Dated
Related ITRDB_Chronology: Not Applicable

Fire scar data from this site are available in FHX2 format at:
  https://www.ncei.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usyc-001.fhx
along with associated metadata at:
  https://www.ncei.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/usyc-001-noaa.txt
DOI: 10.25921/dtxx-pg42
title: NOAA/WDS Paleoclimatology - Esper - Hossa Wet - PISY - ITRDB FINL080

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 2021-10-19.