cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/3m3f-sr60
title: NOAA/WDS Paleoclimatology - Southern Indian Ocean Trade Wind Belt Trace Metal Data and a Sea Surface Temperature Reconstruction from Rodrigues Island

description: The western Indian Ocean has been warming rapidly over recent decades, causing a greater number of extreme climatic events. It is therefore of paramount importance to improve our understanding of links between Indian Ocean sea surface temperature (SST) variability, climate change and sustainability of tropical coral reef ecosystems. Here we present monthly resolved coral Sr/Ca records from two different locations from Rodrigues Island (63° E, 19° S) in the south-central Indian Ocean trade wind belt. We reconstruct SST based on a linear relationship with the Sr/Ca proxy with records starting from 1781 and 1945, respectively. We assess relationships between the observed long-term SST and climate fluctuations related to the El Niño–Southern Oscillation (ENSO), the Subtropical Indian Ocean Dipole Mode (SIOD) and the Pacific Decadal Oscillation (PDO) between 1945 and 2006, respectively. The reproducibility of the Sr/Ca records is assessed as are the potential impacts of diagenesis and corallite orientation on Sr/Ca–SST reconstructions. We calibrate individual robust Sr/Ca records with in situ SST and various gridded SST products. The results show that the SST record from Cabri provides the first Indian Ocean coral proxy time series that records the SST signature of the PDO in the south-central Indian Ocean since 1945. We suggest that additional records from Rodrigues Island can provide excellent records of SST variations in the southern Indian Ocean trade wind belt to unravel teleconnections with the SIOD/ENSO/PDO on longer timescales.
description: Chronology based on seasonal cycles in trace elements (Sr/Ca)
      Provided Keywords: corals, Sr/Ca, SST, Madagascar, Indian Ocean
DOI: 10.25921/3j7b-jg07
title: NOAA/WDS Paleoclimatology - Southwest Pacific Ocean alkenone unstaturation ratio from the Pliocene to the present

description: The climate of the tropics and surrounding regions is defined by pronounced zonal (east-west) and meridional (equator to mid-latitudes) gradients in sea surface temperature. These gradients control zonal and meridional atmospheric circulations, and thus the Earth's climate. Global cooling over the past five million years, since the early Pliocene epoch, was accompanied by the gradual strengthening of these temperature gradients. Here we use records from the Atlantic and Pacific oceans, including a new alkenone palaeotemperature record from the South Pacific, to reconstruct changes in zonal and meridional sea surface temperature gradients since the Pliocene, and assess their connection using a comprehensive climate model. We find that the reconstructed zonal and meridional temperature gradients vary coherently over this time frame, showing a one-to-one relationship between their changes. In our model simulations, we systematically reduce the meridional sea surface temperature gradient by modifying the latitudinal distribution of cloud albedo or atmospheric CO2concentration. The simulated zonal temperature gradient in the equatorial Pacific adjusts proportionally. These experiments and idealized modelling indicate that the meridional temperature gradient controls upper-ocean stratification in the tropics, which in turn controls the zonal gradient along the equator, as well as heat export from the tropical oceans. We conclude that this tight linkage between the two sea surface temperature gradients posits a fundamental constraint on both past and future climates.
description: Provided Keywords: paleoclimate, meridional temperature gradient, sea surface temperature, Pliocene, Pleistocene.
DOI: 10.5281/zenodo.17353568
title: Data for Multi-Isotope Characterization of DDT Isolated from Sediment Samples via Orbitrap-IRMS

description: This repository contains data associated with the manuscript "Multi-Isotope Characterization of DDT Isolated from Sediment Samples via Orbitrap-IRMS". The authors are Tim Csernica, John M. Eiler, and Alex L. Sessions. 

There are two types of data: .RAW files generated by Orbitrap-IRMS, and .txt files extracted from these .RAW files using FTStatistic. The .RAW and .txt files are in separate directories.
DOI: 10.25921/3hev-x780
title: NOAA/WDS Paleoclimatology - Paleo-pCO2 Database Western USA Miocene Paleosol CO2 Uncertainty Estimation

description: Quantifying uncertainty is essential for any paleoenvironmental proxy. Recent work on propagating error through the equation used to determine atmospheric CO2 concentrations from paleosol carbonates yields conflicting results. Small magnitude uncertainty from Gaussian error propagation contrasts with larger magnitude uncertainty from Monte Carlo error propagation. The discrepancy is reconciled here by revising partial differential equations for the Gaussian approach. Uncertainties calculated using the two approaches are compared and applied to Miocene calcic paleosols. Monte Carlo-propagated errors are asymmetrical but otherwise agree with Gaussian errors. Three methods for assigning soil-respired CO2 concentrations (S(z)) to paleosols are also compared. A revised calibration of depth to the Bk horizon as a direct proxy for S(z) is presented and although it results in lower atmospheric CO2 concentrations than the original calibration, it results in significantly higher calculated atmospheric CO2 than the use of mean annual precipitation as a proxy for S(z) or assigning S(z) values based on soil order. Averaging atmospheric CO2 concentrations calculated using soil-order based S(z) values from > 10 penecontemporaenous and independent paleosols will likely result in useful constraints on Earth system sensitivity. The improvement of proxies for S(z) is needed to increase the accuracy and precision and to resolve potential volatility in CO2 time series.
description: Carbon isotope (d13C) data and CO2 estimate uncertainty evaluations for Miocene paleosols from the western United States, contributed to the Paleo-pCO2 Database
DOI: 10.5281/zenodo.17353567
title: Data for Multi-Isotope Characterization of DDT Isolated from Sediment Samples via Orbitrap-IRMS

description: This repository contains data associated with the manuscript "Multi-Isotope Characterization of DDT Isolated from Sediment Samples via Orbitrap-IRMS". The authors are Tim Csernica, John M. Eiler, and Alex L. Sessions. 

There are two types of data: .RAW files generated by Orbitrap-IRMS, and .txt files extracted from these .RAW files using FTStatistic. The .RAW and .txt files are in separate directories.
DOI: 10.13140/rg.2.2.28977.99681
title: Box turtle ranavirus isolate CVASU major capsid protein gene, partial cds
DOI: 10.25921/3qxe-9g28
title: NOAA/WDS Paleoclimatology - The Paleoclimates of Arctic Lakes and Estuaries (PALE) Database

description: Paleoclimates of Arctic Lakes and Estuaries (PALE) is an initiative of the National Science Foundation's Office of Polar Programs (OPP) 'Arctic System Science' global change program. PALE aims at developing an international, integrated study to analyze lake and estuarine cores, with the view of evaluating the causes and consequences of arctic climate change over the last 2000, the last 20 000, and the last 150 000 years of earth history. Research emphasizes modern calibration of proxy climatic indicators with strong chronological control. Data collection and description will be guided by, and will guide, a parallel program with the GENESIS Atmospheric Global Circulation Model (AGCM), with a view of assessing the critical boundary conditions in the arctic system and the location of regions especially sensitive to changes in climate on the different time-scales of interest. Research under the PALE directives commenced in 1991; ongoing research involves a series of co-operative programs in arctic lands, especially Alaska, arctic Canada, arctic Russia, and Iceland.
description: Pollen and sediment geophysical data from arctic lakes, assembled in the 1990s for the Paleoclimates of Arctic Lakes and Estuaries (PALE) project, including the Paleoenvironmental Atlas of Beringia
DOI: 10.25921/3cvd-b815
title: NOAA/WDS Paleoclimatology - Krusic - Mount Smolikas EHS08 - PIHE - ITRDB GREE019

description: We present a June-July drought reconstruction based on the standardized precipitation index (SPI) for the Balkan Peninsula over the period 730-2015 CE. The reconstruction is developed using a composite Pinus heldreichii tree-ring width chronology, from a high-elevation network of eight sites in the Pindus Mountains in northwest Greece, composed of living trees and relict wood. The dataset includes the ring width series of Europe's currently oldest known living tree, dendrochronologically dated to be more than 1075 years old. The spatial coverage of the reconstruction is improved by using an averaged gridded SPI data target derived from a response field that is located north of the study region. Justification for this approach includes the remoteness of instrumental data, the spatial variability of precipitation and synoptic scale circulation patterns. Over the past 1286 years, there have been 51 dry and 43 pluvial events. The driest year during the 1286-year-long period was 1660 and the wettest year was 1482. Comparison with shorter reconstructions and documentary evidence validates the new reconstruction, and provides additional insight into socioeconomic impacts and spatial patterns of extreme events. Fifty-nine of 72 previously undescribed extremes occurred prior to the 17th century. The new reconstruction reveals long-term changes in the number of extremes, including substantially fewer drought and pluvial events in the 20th century. Additional tests on the long-term effects of age structure, replication and covariance changes support the heteroscedastic nature of the reconstructed hydro-climatic extremes.
description: NOAA Template Raw Measurements file added 2019-02-05.
DOI: 10.25921/3hvt-cj21
title: NOAA/WDS Paleoclimatology - Portugal 222,000 Year Speleothem Stable Isotope Data

description: Close coupling of Iberian hydroclimate and North Atlantic sea surface temperature (SST) during recent glacial periods has been identified through the analysis of marine sediment and pollen grains co-deposited on the Portuguese continental margin. While offering precisely correlatable records, these time series have lacked a directly dated, site-specific record of continental Iberian climate spanning multiple glacial cycles as a point of comparison. Here we present a high-resolution, multi-proxy (growth dynamics and d13C, d18O, and d234U values) composite stalagmite record of hydroclimate from two caves in western Portugal across the majority of the last two glacial cycles (~220 ka). At orbital and millennial scales, stalagmite-based proxies for hydroclimate proxies covaried with SST, with elevated d13C, d18O, and d234U values and/or growth hiatuses indicating reduced effective moisture coincident with periods of lowered SST during major ice-rafted debris events, in agreement with changes in palynological reconstructions of continental climate. While in many cases the Portuguese stalagmite record can be scaled to SST, in some intervals the magnitudes of stalagmite isotopic shifts, and possibly hydroclimate, appear to have been somewhat decoupled from SST.
description: Stable isotope (d18O and d13C) data from 5 stalagmites collected in 2 Portuguese caves (Buraca Gloriosa and Gruta do Casal da Lebre), covering the past 222 KYr. Note: An error in the age model for stalagmite BG67 was identified after publication of these data. However, since this error does not shift the time series outside the reported uncertainty window, it does not in any way impact the findings or interpretations presented in the manuscript.
DOI: 10.25921/3kp4-a421
title: NOAA/WDS Paleoclimatology - Sauchyn - Cabin Creek - PSME - ITRDB CANA570

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: Upper Missouri River Basin Streamflow project NOAA Template Raw Measurements file added 2020-01-15.
DOI: 10.25921/3txt-s325
title: NOAA/WDS Paleoclimatology - Sauchyn - Maidens Peak Judith Mountains - PSME - ITRDB MT166

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: Upper Missouri River Basin Streamflow project NOAA Template Raw Measurements file added 2020-01-15.
DOI: 10.25921/37jk-dw44
title: NOAA/WDS Paleoclimatology - Marquardt - Mt. Lemmon 5-needle - PIAZ - ITRDB AZ603

description: Rising temperatures and changes in precipitation may affect plant responses, and mountainous regions in particular are sensitive to the impacts of climate change. The Santa Catalina Mountains, near Tucson, Arizona, USA, are among the best known Madrean Sky Islands, which are defined by pine-oak forests. We compared the sensitivity and temporal stability of climate-growth relationships to quantify the growth responses of sympatric taxa of ponderosa pine to changing climate. Three taxa (three-needle, mixed-needle, and five-needle types) collected from southern slopes of two contact zones (Mt. Lemmon, Mt. Bigelow) were evaluated. Positive climate-growth correlations in these semiarid high-elevation pine forests indicated a seasonal shift from summer- to spring-dominant precipitation since 1950, which is a critical time for reproduction. Mixed- and five-needle types responded to winter precipitation, and growth was reduced for the five-needle type when spring conditions were dry. Growth trends in response to temperature and specific to site were observed, which indicated the climate signal can be weakened when data are combined into a single chronology. Significant fluctuations in temperature-growth correlations since 1950 occurred for all needle types. These results demonstrated a dramatic shift in sensitivity of annual tree growth to the seasonality of the limiting factor, and a climatic trend that increases local moisture stress may impact the stability of climate-growth relationships. Moreover, output from temperature-growth analyses based on ring-width data (for example from semiarid sites) that does not account for positive and negative growth trends may be adversely affected, potentially impacting climate reconstructions.
description: Sky Island Pines, Arizona (USA): 5-needle Pinus arizonica. NOAA Template Raw Measurements file added 2020-03-09.
DOI: 10.25921/3z2n-mj13
title: NOAA/WDS Paleoclimatology - Wilson - Canyon Lake - PCGL - ITRDB CANA593

description: In north-western North America, the so-called divergence problem (DP) is expressed in tree ring width (RW) as an unstable temperature signal in recent decades. Maximum latewood density (MXD), from the same region, shows minimal evidence of DP. While MXD is a superior proxy for summer temperatures, there are very few long MXD records from North America. Latewood blue intensity (LWB) measures similar wood properties as MXD, expresses a similar climate response, is much cheaper to generate and thereby could provide the means to profoundly expand the extant network of temperature sensitive tree-ring (TR) chronologies in North America. In this study, LWB is measured from 17 white spruce sites (Picea glauca) in south-western Yukon to test whether LWB is immune to the temporal calibration instabilities observed in RW. A number of detrending methodologies are examined. The strongest calibration results for both RW and LWB are consistently returned using age-dependent spline (ADS) detrending within the signal-free (SF) framework. RW data calibrate best with June-July maximum temperatures (Tmax), explaining up to 28% variance, but all models fail validation and residual analysis. In comparison, LWB calibrates strongly (explaining 43-51% of May-August Tmax) and validates well. The reconstruction extends to 1337 CE, but uncertainties increase substantially before the early 17th century because of low replication. RW-, MXD- and LWB-based summer temperature reconstructions from the Gulf of Alaska, the Wrangell Mountains and Northern Alaska display good agreement at multi-decadal and higher frequencies, but the Yukon LWB reconstruction appears potentially limited in its expression of centennial-scale variation. While LWB improves dendroclimatic calibration, future work must focus on suitably preserved sub-fossil material to increase replication prior to 1650 CE.
description: NOAA Template Raw Measurements file added 2020-03-09.
DOI: 10.25921/35bn-6n71
title: NOAA/WDS Paleoclimatology - Wilson - Gray Mountain (White Horse) - PCGL - ITRDB CANA598

description: In north-western North America, the so-called divergence problem (DP) is expressed in tree ring width (RW) as an unstable temperature signal in recent decades. Maximum latewood density (MXD), from the same region, shows minimal evidence of DP. While MXD is a superior proxy for summer temperatures, there are very few long MXD records from North America. Latewood blue intensity (LWB) measures similar wood properties as MXD, expresses a similar climate response, is much cheaper to generate and thereby could provide the means to profoundly expand the extant network of temperature sensitive tree-ring (TR) chronologies in North America. In this study, LWB is measured from 17 white spruce sites (Picea glauca) in south-western Yukon to test whether LWB is immune to the temporal calibration instabilities observed in RW. A number of detrending methodologies are examined. The strongest calibration results for both RW and LWB are consistently returned using age-dependent spline (ADS) detrending within the signal-free (SF) framework. RW data calibrate best with June-July maximum temperatures (Tmax), explaining up to 28% variance, but all models fail validation and residual analysis. In comparison, LWB calibrates strongly (explaining 43-51% of May-August Tmax) and validates well. The reconstruction extends to 1337 CE, but uncertainties increase substantially before the early 17th century because of low replication. RW-, MXD- and LWB-based summer temperature reconstructions from the Gulf of Alaska, the Wrangell Mountains and Northern Alaska display good agreement at multi-decadal and higher frequencies, but the Yukon LWB reconstruction appears potentially limited in its expression of centennial-scale variation. While LWB improves dendroclimatic calibration, future work must focus on suitably preserved sub-fossil material to increase replication prior to 1650 CE.
description: NOAA Template Raw Measurements file added 2020-03-09.
DOI: 10.25921/3jdf-yk74
title: NOAA/WDS Paleoclimatology - Olson fire data from Dugout Riparian, Blue Mountains, Oregon - IMPD USDUG001

description: Riparian forests link terrestrial and freshwater communities and therefore understanding the landscape context of fire regimes in these forests is critical to fully understanding the landscape ecology. However, few direct studies of fire regimes exist for riparian forests, especially in the landscape context of adjacent upland forests or studies of long-term climate drivers of riparian forest fires. We reconstructed low-severity fire history from tree rings in 38 1-ha riparian plots  and combined them with existing fire histories from 104 adjacent upland plots to yield 2633 fire scars sampled on 454 trees. Historically (1650–1900), low-severity fires burned more frequently in upland than riparian plots, but this difference was not significant (p = 0.15). During more than half the fire years at both sites, fires were extensive and burned synchronously in riparian and upland plots, and climate was significantly dry during these years. However, climate was not significantly dry when fires burned in only one plot type. Historically, entire riparian zones likely burned in these two study sites of the Blue Mountains during dry years. This study suggests that riparian and upland forests could be managed similarly, especially given the projected increases to fire frequency and intensity from impending climate change.
description: This site was sampled by Diana Olson as part of her masters thesis research to reconstruct historical fire regimes in riparian areas of Oregon.

Ring-boundary fire scars were assigned to the preceding calendar year.

Information on plot location, elevation, aspect, etc. are provided in Olson 2000.

usdug001-tree-info.csv provides species and status for fire-scarred trees. 

Funding: UDSA Forest Service, Pacific Northwest Research Station through cooperative agreements PNW-97-5082-1-CA and PNW-93-0479 with the University of Washington.
DOI: 10.13140/rg.2.2.10446.87367
title: Rio de La Plata Craton
DOI: 10.3535/cws-79x-54j
title: †Pseudorbitoides trechmanni Douvillé, 1922

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/52t-bnq-96f
title: †Pseudorbitoides trechmanni Douvillé, 1922

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/w1q-sr0-4la
title: Animalia

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/40p-xw8-rlw
title: †Pseudorbitoides israelskii Vaughan & Cole, 1932

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/gsf-k45-h6h
title: Soricomorpha Gregory, 1910

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/433-611-f47
title: Cetacea Brisson, 1762

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/ter-gtk-1rh
title: Cnidaria

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/99s-wbl-ske
title: Cetacea Brisson, 1762

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/we3-6n5-wap
title: Animalia

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/gr6-h5j-gxf
title: Aegocrioceras

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/hwm-bqe-xa3
title: Aegocrioceras

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/xew-tec-sa2
title: Mammalia Linnaeus, 1758

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/ln7-zle-9tz
title: Animalia

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/s2f-vln-j4k
title: Animalia

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/tve-n7x-84e
title: Mammalia Linnaeus, 1758

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.
DOI: 10.3535/blb-s4g-vng
title: †Globorotalia menardii (d'Orbigny in Parker, Jones & Brady, 1865)

description: Digital Specimen for the physical specimen hosted at Naturalis Biodiversity Center.