cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/jr21-p906
title: NOAA/WDS Paleoclimatology - Bai - Ailaoshan - TESI - ITRDB CHN086

description: The relationship between tree-width of Tetracentron sinense and climate factors in the humid evergreen broad-leaved forest in the middle Ailao Mountains was studied in order to explore the potential for reconstructing climate change in the past and to provide a theoretical basis for modelling species distribution and conservation of T. sinense in the context of global climate change.[Methods]Increment cores of T. sinense were collected by increment borer, and tree ring-width was measured with standard dendrochronological techniques. Each tree-ring measurement was assigned to the year of its formation with cross-dating techniques, and then tree-ring series were detrended with negative exponential curve and cubic spline function. The resulting standard chronology was correlated with monthly climatic data from Jingdong meteorological station.[Results] Analysis of tree ring-width chronology and climate factors showed that the radial growth of T. sinense was significantly correlated with mean temperature and extreme high temperature of February and June in the year (P<0.05). Moreover, ring-width chronology showed significant positive correlation with the number of hours of sunlight (P<0.05), but negative correlation with relative humidity of February and March (P<0.01). Our study demonstrated that multiple climatic factors influenced the radial growth, and the climatic conditions during the early growing season is crucial for the growth of T. sinense.[Conclusion] This study showed that T. sinense in the warm and humid subtropical forests produce distinct and cross-datable annual growth rings. Tree ring-width chronology of T. sinense can reveal considerable climate information, which has high potential for reconstructing past climate change in the study area.
description: NOAA Template Raw Measurements file added 2022-04-04.
DOI: 10.5281/zenodo.17352242
title: Nitrate dataset from the fjords around Uummannaq, Northwest Greenland

description: Data was collected from the research vessel RV Sanna, Eurofleets+ IOPD cruise, in the fjord system near Uummannaq in West Greenland, between 28 June 2022 and 10 July 2022, along in total five fjords, from the shelf edge towards the head of the fjord or until icebergs blocked the way. More details can be found in the cruise report: https://csr.seadatanet.org/report/21026654

# name 1 = Cast: Cast name# name 2 = Date: YYYYMMDD, date of collection# name 3 =  Time: time (format HHMM) in UTC# name 4 = Latitude: Latitude in decimal degrees# name 5 = Longitude: Longitude in decimal degrees# name 6 = Pressure: Pressure, Strain Gauge [db]# name 7 = Nitrate in uM (microMolar) measured using SUNA V2# name 8 = Nitrate in uM  from water samples collected at discrete depths using with a 5 L Niskin bottle. 

Subsamples (10 mL) were filtered through 0.45 um filters (Q-Max GPF) and frozen at -20C until analysis. Nutrients were measured by standard colorimetric methods on a Seal QuAAtro autoanalyzer.
DOI: 10.25921/j1y6-z576
title: NOAA/WDS Paleoclimatology - O'Connor fire data from Pinalenos_F19, Southeast Arizona - IMPD USF19001

description: In recent decades fire size and severity have been increasing in high elevation forests of the American Southwest. Ecological outcomes of these increases are difficult to gauge without an historical context for the role of fire in these systems prior to interruption by Euro-American land uses. Across the gradient of forest types in the Pinaleño Mountains, a Sky Island system in southeast Arizona that experienced two relatively large high-severity fires in the last two decades, we compared fire characteristics and climate associations before and after the onset of fire exclusion to determine the degree of similarity between past and recent fires. We use a gridded fire scar and demography sampling network to reconstruct spatially explicit estimates of fire extent and burn severity, as well as climate associations of fires from individual site to landscape scales from 1640 to 2008 C.E. We found that patterns of fire frequency, size, and severity were relatively stable for at least several centuries prior to 1880. A combination of livestock grazing and active fire suppression after circa 1880 led to (1) a significant reduction in fire spread but not fire ignition, (2) a conversion of more than 80% of the landscape from a frequent, low to mixed-severity fire regime to an infrequent mixed to high-severity fire regime, and (3) an increase in fuel continuity within a mid-elevation zone of dry mixed-conifer forest, resulting in increased opportunities for surface and crown fire spread into higher elevation mesic forests. The two most recent fires affecting mesic forests were associated with drought and temperature conditions that were not exceptional in the historical record but that resulted in a relative proportion of high burn severity up to four times that of previous large fires. The ecological effects of these recent fires appear to be more severe than any fire in the reconstructed period, casting uncertainty upon the recovery of historical species composition in high-severity burn patches. Significant changes to the spatial pattern, frequency, and climate associations of spreading fires after 1880 suggest that limits to fuel loading and fuel connectivity sustained by frequent fire have been removed. Coinciding factors of high fuel continuity and fuel loading, projected lengthening of the fire season, and increased variability in seasonal precipitation suggest that large high-severity fires, especially in mixed-conifer forests, will become the predominant fire type without aggressive actions to reduce fuel continuity and restore fire-resilient forest structure and species composition.
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.
DOI: 10.25921/jkqj-hb17
title: NOAA/WDS Paleoclimatology - Schneider - Berlin Grünanlage Britz-Süd den09 - QURO - ITRDB DEU312

description: Using dendroclimatological techniques this study investigates whether inner city tree-ring width (TRW) chronologies from eight tree species (ash, beech, fir, larch, lime, sessile and pedunculate oak, and pine) are suitable to examine the urban heat island of Berlin, Germany. Climate-growth relationships were analyzed for 18 sites along a gradient of increasing urbanization covering Berlin and surrounding rural areas. As a proxy for defining urban heat island intensities at each site, we applied urbanization parameters such as building fraction, impervious surfaces, and green areas. The response of TRW to monthly and seasonal air temperature, precipitation, aridity, and daily air-temperature ranges were used to identify climate-growth relationships. Trees from urban sites were found to be more sensitive to climate compared to trees in the surrounding hinterland. Ring width of the deciduous species, especially ash, beech, and oak, showed a high sensitivity to summer heat and drought at urban locations (summer signal), whereas conifer species were found suitable for the analysis of the urban heat island in late winter and early spring (winter signal). The summer and winter signals were strongest in tree-ring chronologies when the urban heat island intensities were based on an area of about 200 m to 3000 m centered over the tree locations, and thus reflect the urban climate at the scale of city quarters. For the summer signal, the sensitivity of deciduous tree species to climate increased with urbanity. These results indicate that urban trees can be used for climate response analyses and open new pathways to trace the evolution of urban climate change and more specifically the urban heat island, both in time and space.
description: NOAA Template Raw Measurements file added 2022-05-31. 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/j12e-xa64
title: NOAA/WDS Paleoclimatology - Northern South China Sea Porites Coral d13C Data during the mid-Holocene

description: Coral skeleton d13C is a routinely measured indicator in modern insolation change research, but the knowledge of environmental and climatic signals recorded in its seasonality during geological time is sparse. In this study, we present eight Porites coral d13C records from the mid-late Holocene to the present from the northern South China Sea (NSCS). Compared with the main control factors for modern d13C changes, coral d13C seasonality in the NSCS since the mid-Holocene shows a long-term decreasing trend, which is consistent with the change trend as orbital-induced (precession) insolation seasonal amplitude. By excluding other influencing factors, we speculate that the stronger coral d13C seasonality (18.8%) over the mid-Holocene than modern period is attributable to the metabolic effect, which predicts the stronger coral d13C seasonality under stronger insolation seasonality. Our study has implications for coral d13C seasonality as a potential indicator to record past insolation information under different climatic backgrounds.
description: Provided Keywords: Coral d13C seasonality, Insolation seasonality, Mid-late Holocene, Porites coral, Metabolic fractionation
DOI: 10.15468/dl.p5h2hg
title: Occurrence Download

description: A dataset containing 162 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Drakaea elastica"
 ]
}

 The dataset includes 162 records from 26 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0021063-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/jag4-7928
title: NOAA/WDS Paleoclimatology - Black - Wasson - PSME - ITRDB OR128

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: trees drowned in a lake formed when a landslide impounded a stream
DOI: 10.25921/jfkx-t752
title: NOAA/WDS Paleoclimatology - Bonney - Winston Woods (Site 02) - QURU - ITRDB CANA655

description: Time-series of satellite-derived vegetation proxies and tree-rings widths (TRW) are similar, providing temporal records of forest productivity change from different perspectives and processes. Previous research on this relationship has focused on temperature or moisture limited coniferous forests, using lower spatial resolution (e.g., 8000 m) satellites and normalized difference vegetation index (NDVI) to test relationships over 15-30 years. There is an opportunity to leverage recent advances in building Landsat (30 m) time-series to expand comparisons into new forest types (e.g., coniferous vs. deciduous), areas (e.g., fragmented forests) and over longer periods (e.g., nearly 50 years). However, a better understanding of factors that influence relationship strength is required. We compared tree-ring measurements, converted to a ring width index (RWI), and Landsat tasseled cap angle (TCA) derived canopy cover (CC) from 1972 to 2018 across 16 deciduous, mixed, and coniferous stands in southern Ontario, Canada. For all chronologies, overall relationship strength was assessed with correlation approaches (RWI-CC, both vs. climate), and shorter-term increase-decline trends were compared with segmented regression. There were significant forest type differences, with coniferous chronologies correlating stronger with CC than deciduous. Deciduous chronologies and CC had opposite connections with summer temperature, with climate warming increasing CC and coniferous RWI but not deciduous RWI from 1980 to 2010. More recent decline at most sites appears related to a major ice storm, but multiple factors may be coexisting. We tested the utility of tree-rings for validating nearly 50 years of Landsat-observed change in urban-rural temperate forests, identifying useful connections at coniferous sites. However, there are limitations to comparing long-term Landsat time-series (based on yearly summer data) with annual tree-ring growth.
description: NOAA Template Raw Measurements file added 2022-09-08.
DOI: 10.25921/jfbz-hs09
title: NOAA/WDS Paleoclimatology - Chinese Pine Maximum Latewood Density Hydroclimate Records in semi-arid Northern China

description: Long records of tree-ring maximum latewood density (MXD) measurements in conifers have been successfully employed to reconstruct summer temperature changes globally. Yet, the potential of MXD as a proxy in semi-arid, low-latitude regions for reconstructing either temperature or hydroclimate variability remains largely unexplored. Here, we developed a MXD data set of Chinese pine from semi-arid northern China, and investigated its sensitivity to different climate variables. We found that the annual self-calibrated Palmer Drought Severity Index from previous August to current July displays the strongest influence on the MXD variation. The entire MXD chronology (covering 1736–2020) is highly consistent with nearby tree-ring-based annual precipitation and drought reconstructions at decadal timescales, confirming a temporally stable hydroclimate signal in our MXD record. In particular, the rapid wetting trend during the 2010–2020 period is well captured by the MXD data. This novel study has wide implications for future use of tree-ring density data to reconstruct past climate changes globally.
description: Chinese pine maximum latewood density in semi-arid northern China records hydroclimate rather than temperature.
DOI: 10.25921/jtty-7a42
title: NOAA/WDS Paleoclimatology - Hartl - Nationalpark Kalkalpen, Schwarzkogel - LADE - ITRDB AUT143

description: 1.  Outbreaks of the larch budmoth (LBM) in the European Alps are among the most documented population cycles and their historical occurrence has been reconstructed over 1200 years.
 2.  Causes and consequences of cyclic LBM outbreaks are poorly understood and little is known about populations near the margin of the host's distribution range.
 3.  In the present study, we quantify historical LBM outbreaks and associated growth reductions in host trees (European larch). Tree-ring data collected from 18 sites between approximately 500 and 1700 m a.s.l. in the Northern pre-Alps are compared with data from the Western Alps and Tatra Mountains, as well as with nonhost Norway spruce.
 4.  Highly synchronized host and nonhost growth in the Northern pre-Alps shows that periodic LBM outbreaks are largely absent near the distributional limit of larch. By contrast, growth patterns in the Western Alps LBM core region are indicative of LBM events. Although climatic conditions in the Northern pre-Alps and Tatra Mountains would allow LBM outbreaks, low host plant abundance is likely the key driver for the absence of cyclic outbreaks in these regions.
 5.  The results obtained in the present study suggest that, in addition to the climatic conditions, host-species abundance is critically important for the occurrence of periodic LBM outbreaks and the determination of the respective outbreak range.
DOI: 10.15468/dl.gf6w47
title: Occurrence Download

description: A dataset containing 13223 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is Zamenis scalaris",
 "Country is Spain",
 "HasCoordinate is true"
 ]
}

 The dataset includes 13223 records from 37 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0021064-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/jmh8-rp08
title: NOAA/WDS Paleoclimatology - Bonney - Alton Forest CA (Site 13) - PCAB - ITRDB CANA668

description: Time-series of satellite-derived vegetation proxies and tree-rings widths (TRW) are similar, providing temporal records of forest productivity change from different perspectives and processes. Previous research on this relationship has focused on temperature or moisture limited coniferous forests, using lower spatial resolution (e.g., 8000 m) satellites and normalized difference vegetation index (NDVI) to test relationships over 15-30 years. There is an opportunity to leverage recent advances in building Landsat (30 m) time-series to expand comparisons into new forest types (e.g., coniferous vs. deciduous), areas (e.g., fragmented forests) and over longer periods (e.g., nearly 50 years). However, a better understanding of factors that influence relationship strength is required. We compared tree-ring measurements, converted to a ring width index (RWI), and Landsat tasseled cap angle (TCA) derived canopy cover (CC) from 1972 to 2018 across 16 deciduous, mixed, and coniferous stands in southern Ontario, Canada. For all chronologies, overall relationship strength was assessed with correlation approaches (RWI-CC, both vs. climate), and shorter-term increase-decline trends were compared with segmented regression. There were significant forest type differences, with coniferous chronologies correlating stronger with CC than deciduous. Deciduous chronologies and CC had opposite connections with summer temperature, with climate warming increasing CC and coniferous RWI but not deciduous RWI from 1980 to 2010. More recent decline at most sites appears related to a major ice storm, but multiple factors may be coexisting. We tested the utility of tree-rings for validating nearly 50 years of Landsat-observed change in urban-rural temperate forests, identifying useful connections at coniferous sites. However, there are limitations to comparing long-term Landsat time-series (based on yearly summer data) with annual tree-ring growth.
description: NOAA Template Raw Measurements file added 2022-09-08.
DOI: 10.25921/jdkd-h849
title: NOAA/WDS Paleoclimatology - Hartl - Berchtesgaden, Sittersbach - PCAB - ITRDB DEU364

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.k4ay8s
title: Occurrence Download

description: A dataset containing 225 species occurrences available in GBIF matching the query:
{
 "and" : [
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is Begonia octopetala"
 ]
}

 The dataset includes 225 records from 13 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0021065-251009101135966/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.25921/jhdp-rk12
title: NOAA/WDS Paleoclimatology - Farris fire data from Mica Mountain - IMPD US02_007

description: Fire scars are used widely to reconstruct historical fire regime parameters in forests around the world. Because fire scars provide incomplete records of past fire occurrence at discrete points in space, inferences must be made to reconstruct fire frequency and extent across landscapes using spatial networks of fire-scar samples. Assessing the relative accuracy of fire-scar fire history reconstructions has been hampered due to a lack of empirical comparisons with independent fire history data sources. We carried out such a comparison in a 2780-ha ponderosa pine forest on Mica Mountain in southern Arizona (USA) for the time period 1937–2000. Using documentary records of fire perimeter maps and ignition locations, we compared reconstructions of key spatial and temporal fire regime parameters developed from documentary fire maps and independently collected fire-scar data (n = 60 plots). We found that fire-scar data provided spatially representative and complete inventories of all major fire years (>100 ha) in the study area but failed to detect most small fires. There was a strong linear relationship between the percentage of samples recording fire scars in a given year (i.e., fire-scar synchrony) and total area burned for that year (y = 0.0003x + 0.0087, r2 = 0.96). There was also strong spatial coherence between cumulative fire frequency maps interpolated from fire-scar data and ground-mapped fire perimeters. Widely reported fire frequency summary statistics varied little between fire history data sets: fire-scar natural fire rotations (NFR) differed by <3 yr from documentary records (29.6 yr); mean fire return intervals (MFI) for large-fire years (i.e., ≥25% of study area burned) were identical between data sets (25.5 yr); fire-scar MFIs for all fire years differed by 1.2 yr from documentary records. The known seasonal timing of past fires based on documentary records was furthermore reconstructed accurately by observing intra-annual ring position of fire scars and using knowledge of tree-ring growth phenology in the Southwest. Our results demonstrate clearly that representative landscape-scale fire histories can be reconstructed accurately from spatially distributed fire-scar samples.
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: Laboratory of Tree-Ring, University of Arizona
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/us02_007.fhx
along with associated metadata at:
  https://www.ncei.noaa.gov/pub/data/paleo/firehistory/firescar/northamerica/us02_007-noaa.txt
DOI: 10.25921/j7dd-8527
title: NOAA/WDS Paleoclimatology - Hartl - Schliersee, Hinterlapberg außen - PCAB - ITRDB DEU396

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: 10.25921/ja83-p091
title: NOAA/WDS Paleoclimatology - Hartl - Schliersee, Alte Klause - FASY - ITRDB DEU405

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