cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/hhps-mt78
title: NOAA/WDS Paleoclimatology - Greenland Ice Cores 500 Year Methanesulfonic Acid Data

description: Marine phytoplankton have a crucial role in the modulation of marine-based food webs, fishery yields and the global drawdown of atmospheric carbon dioxide. However, owing to sparse measurements before satellite monitoring in the twenty-first century, the long-term response of planktonic stocks to climate forcing is unknown. Here, using a continuous, multi-century record of subarctic Atlantic marine productivity, we show that a marked 10 +/- 7% decline in net primary productivity has occurred across this highly productive ocean basin over the past two centuries. We support this conclusion by the application of a marine-productivity proxy, established using the signal of the planktonic-derived aerosol methanesulfonic acid, which is commonly identified across an array of Greenlandic ice cores. Using contemporaneous satellite-era observations, we demonstrate the use of this signal as a robust and high-resolution proxy for past variations in spatially integrated marine productivity. We show that the initiation of declining subarctic Atlantic productivity broadly coincides with the onset of Arctic surface warming, and that productivity strongly covaries with regional sea-surface temperatures and basin-wide gyre circulation strength over recent decades. Taken together, our results suggest that the decline in industrial-era productivity may be evidence of the predicted collapse of northern Atlantic planktonic stocks in response to a weakened Atlantic Meridional Overturning Circulation. Continued weakening of this Atlantic Meridional Overturning Circulation, as projected for the twenty-first century, may therefore result in further productivity declines across this globally relevant region.
description: Previously-unpublished raw (i.e., unsmoothed, unaveraged) methanesulfonic acid ice core measurements for 6/12 ice core records described in Osman et al. 2019
DOI: 10.25921/hc0s-dv37
title: NOAA/WDS Paleoclimatology - Esper - Jokkmokk Dry - PISY - ITRDB SWED341

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.
DOI: 10.25921/hypm-kt71
title: NOAA/WDS Paleoclimatology - Esper - Westerwald - PCAB - ITRDB GERM241

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: Missing rings were inserted with the value 1. NOAA Template Raw Measurements file added 2020-09-03.
DOI: 10.15468/dl.hk7ntp
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Scaphopoda)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1980",
 "OccurrenceStatus is Present",
 {
 "not" : {
 "BasisOfRecord" : [
 "is one of (Fossil, Living Specimen)"
 ]
 }
 },
 "Geometry POLYGON((-170 80,-160 80,-160 90,-170 90,-170 80))"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0020864-251009101135966/datasets/export for details.
DOI: 10.25921/h26b-9t92
title: NOAA/WDS Paleoclimatology - Allen - Tiwi Islands - CAIN - ITRDB AUSL060

description: An understanding of tropical hydroclimate variability, the associated drivers and how it is likely to change is a major scientific and societal challenge that is acutely hampered by short instrumental records. We present a 246-year tree-ring drought reconstruction of the Standardised Precipitation Evaporation Index (SPEI) for monsoonal northern Australia for the end of the wet season (March-May; MAM). This reconstruction extends the instrumental record back by 150 years. Around one third of total annual rainfall falls during MAM, making it a crucial component of the monsoonal cycle. MAM is also the season most impacted by the differential decay process of Central Pacific (as opposed to Western Pacific) El Nino events that are linked with dry conditions over northern and northwestern Australia more generally. Our reconstruction therefore provides an opportunity to consider how central Pacific variability has modulated MAM hydroclimate in Australia's monsoonal north over the past two and a half centuries. We found that MAM hydroclimate extremes in the region have a strong, but asymmetric relationship with central Pacific sea surface temperatures (SSTs) and ENSO indices. Extremely wet MAMs in monsoonal north Australia were associated with cooler SSTs, above average rainfall across much of Australia, and often coincided with La Nina events. The spatial relationship between dry extremes and Pacific SSTs during dry events was generally, but weakly, consistent with the SST signature of central Pacific El Nino events. The association between reconstructed dry extremes in the monsoonal north and dry conditions across the rest of Australia is also less extensive and weaker than for wet events. Results suggest that more extreme wet events in the Australian monsoonal north likely reflect cool central Pacific SSTs and later termination of the Australian monsoon. Consecutive years with extremely dry MAMs became more frequent over the latter part of the 20th Century while the probability of an extreme dry MAM followed by an extreme wet MAM the next year peaked in the mid 20th Century and has since declined.
description: Callitris intratropica ring-width data used for drought reconstruction, monsoonal north Australia. NOAA Template Raw Measurements file added 2020-11-18.
DOI: 10.25921/hmwg-4995
title: NOAA/WDS Paleoclimatology - North Cascades 445 Year Snowpack Reconstruction

description: Cool-season precipitation is a critical component of western North American water supplies. In recent decades snow-water equivalent (snowpack) has declined dramatically, culminating in record lows along the northern Cascade Range, USA, during the winters of 2014 and 2015. Given the brevity of observational records, the extent to which these recent trends exceed historical ranges of variability remains poorly understood. Here, we use a network of 30 tree-ring chronologies to reconstruct April 1st snowpack in the northern Cascade Mountains (Washington, USA) over the past ca. 400 years that accounts for 62% of the instrumental period variability. The reconstruction is characterized by considerable interannual- to interdecadal-scale variability. Yet, the most conspicuous feature is a decline that began in the mid-1970s concurrent with a shift to above-average air temperature which is accelerated through to the most recent years of the record. The 2014-2016 snow drought, especially snow conditions during the 2015 winter, across the northern Cascades is unprecedented within the context of the last 400 years. The reconstruction is characterized by considerable interannual- to interdecadal-scale variability, but a conspicuous decline emerged in the mid-1970s and accelerated through to the most recent years of the record to levels below the pre-industrial envelope of variability. This decline culminated in the 2014-2016 northern Cascade Mountains snow drought, which is unprecedented within the context of the last 400 years. Not only is the 20th-21st century period characterized by the rapid decline in snowpack conditions, it is also highly volatile. Extreme flips in snowpack conditions (year-to-year changes between <5th-> 95th percentiles) during the 20th-21st centuries were anomalous within the context of the record. These patterns described for the North Cascades are concurrent with anomalously low snowpack in the Sierra Nevada Mountains of California, and thus part of a broader trend toward reduced snowpack in western North America. This decline will fundamentally impact regional drought and hydrography in North Cascadia and is likely the combined result of rising temperatures, weakening westerly winds, and the magnitude and timing of winter precipitation events.
description: April 1 snow water equivalent (SWE) reconstruction for the Northern Cascade Mountains, Washington and Oregon USA, for the past 445 years, based on tree-ring data.
DOI: 10.25921/hqxz-5894
title: NOAA/WDS Paleoclimatology - Oskolkov - Shida - LASI - ITRDB RUSS293

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 2021-02-22.
DOI: 10.25921/hnt8-bv54
title: NOAA/WDS Paleoclimatology - Antarctica 40,000 Year Temperature and Elevation Reconstructions

description: Water-stable isotopes in polar ice cores are a widely used temperature proxy in paleoclimate reconstruction, yet calibration remains challenging in East Antarctica. Here, we reconstruct the magnitude and spatial pattern of Last Glacial Maximum surface cooling in Antarctica using borehole thermometry and firn properties in seven ice cores. West Antarctic sites cooled ~10°C relative to the preindustrial period. East Antarctic sites show a range from ~4° to ~7°C cooling, which is consistent with the results of global climate models when the effects of topographic changes indicated with ice core air-content data are included, but less than those indicated with the use of water-stable isotopes calibrated against modern spatial gradients. An altered Antarctic temperature inversion during the glacial reconciles our estimates with water-isotope observations.
description: Temperature and elevation reconstructions for 7 Antarctic ice core locations (WAIS Divide, EPICA Dronning Maud Land, EPICA Dome C, TALDICE (Talos Dome), Siple Dome, SPICEcore (South Pole), and Dome Fuji) for the past 40,000 years, based on Antarctic ice core borehole temperature and d15N. Provided Keywords: Antarctica, Surface temperature, Surface accumulation, Last Glacial Maximum
DOI: 10.25921/h9zj-n175
title: NOAA/WDS Paleoclimatology - Coulthard - Rough Creek - PIPO - ITRDB CANA642

description: The recent intensification of floods and droughts in the Fraser River Basin (FRB) of British Columbia has had profound cultural, ecological, and economic impacts that are expected to be exacerbated further by anthropogenic climate change. In part due to short instrumental runoff records, the long-term stationarity of hydroclimatic extremes in this major North American watershed remains poorly understood, highlighting the need to use high-resolution paleoenvironmental proxies to inform on past streamflow. Here we use a network of tree-ring proxy records to develop 11 subbasin-scale, complementary flood- and drought-season reconstructions, the first of their kind. The reconstructions explicitly target management-relevant flood and drought seasons within each basin, and are examined in tandem to provide an expanded assessment of extreme events across the FRB with immediate implications for water management. We find that past high flood-season flows have been of greater magnitude and occurred in more consecutive years than during the observational record alone. Early 20th century low flows in the drought season were especially severe in both duration and magnitude in some subbasins relative to recent dry periods. Our Fraser subbasin-scale reconstructions provide long-term benchmarks for the natural flood and drought variability prior to anthropogenic forcing. These reconstructions demonstrate that the instrumental streamflow records upon which current management is based likely underestimate the full natural magnitude, duration, and frequency of extreme seasonal flows in the FRB, as well as the potential severity of future anthropogenically forced events.
description: Fraser River Basin, British Columbia, Canada Tree-Ring Data NOAA Template Raw Measurements file added 2021-12-29.
DOI: 10.25921/hm31-qz61
title: NOAA/WDS Paleoclimatology - Larson - Caswick - QUAL - ITRDB WI025

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. NOAA Template Raw Measurements file added 2021-10-19.
DOI: 10.25921/h7bt-s652
title: NOAA/WDS Paleoclimatology - Maxwell - Hoot Woods - LITU - ITRDB IN013

description: Understanding the historic variability in the hydroclimate provides important information on possible extreme dry or wet periods that in turn inform water management plans. Tree rings have long provided historical context of hydroclimate variability of the U.S. However, the tree-ring network used to create these countrywide gridded reconstructions is sparse in certain locations, such as the Midwest. Here, we increase (n = 20) the spatial resolution of the tree-ring network in southern Indiana and compare a summer (June-August) Palmer Drought Severity Index (PDSI) reconstruction to existing gridded reconstructions of PDSI for this region. We find both droughts and pluvials that were previously unknown that rival the most intense PDSI values during the instrumental period. Additionally, historical drought occurred in Indiana that eclipsed instrumental conditions with regard to severity and duration. During the period 1962-2004 CE, we find that teleconnections of drought conditions through the Atlantic Meridional Overturning Circulation have a strong influence (r = -0.60, p < 0.01) on secondary tree growth in this region for the late spring-early summer season. These findings highlight the importance of continuing to increase the spatial resolution of the tree-ring network used to infer past climate dynamics to capture the sub-regional spatial variability. Increasing the spatial resolution of the tree-ring network for a given region can better identify sub-regional variability, improve the accuracy of regional tree-ring PDSI reconstructions, and provide better information for climatic teleconnections.
description: Eastern Deciduous Forest, Climate response, Palmer Drought Severity Index NOAA Template Raw Measurements file added 2020-09-03.
DOI: 10.25921/h2kg-sm18
title: NOAA/WDS Paleoclimatology - Harley - Lilly-Dickey Woods - QUAL - ITRDB IN019

description: Understanding the historic variability in the hydroclimate provides important information on possible extreme dry or wet periods that in turn inform water management plans. Tree rings have long provided historical context of hydroclimate variability of the U.S. However, the tree-ring network used to create these countrywide gridded reconstructions is sparse in certain locations, such as the Midwest. Here, we increase (n = 20) the spatial resolution of the tree-ring network in southern Indiana and compare a summer (June-August) Palmer Drought Severity Index (PDSI) reconstruction to existing gridded reconstructions of PDSI for this region. We find both droughts and pluvials that were previously unknown that rival the most intense PDSI values during the instrumental period. Additionally, historical drought occurred in Indiana that eclipsed instrumental conditions with regard to severity and duration. During the period 1962-2004 CE, we find that teleconnections of drought conditions through the Atlantic Meridional Overturning Circulation have a strong influence (r = -0.60, p < 0.01) on secondary tree growth in this region for the late spring-early summer season. These findings highlight the importance of continuing to increase the spatial resolution of the tree-ring network used to infer past climate dynamics to capture the sub-regional spatial variability. Increasing the spatial resolution of the tree-ring network for a given region can better identify sub-regional variability, improve the accuracy of regional tree-ring PDSI reconstructions, and provide better information for climatic teleconnections.
description: Eastern Deciduous Forest, Climate response, Palmer Drought Severity Index NOAA Template Raw Measurements file added 2020-09-03.
DOI: 10.25921/h1gy-6z76
title: NOAA/WDS Paleoclimatology - Maxwell - Morgan Monroe Flux Tower Site - LITU - ITRDB IN025

description: Several important environmental influences of tree growth and carbon sequestration have changed over the past several decades in eastern North America, specifically, more frequent pluvial conditions, increased carbon dioxide (CO2) concentrations, and decreased acidic deposition. These factors could lead to changes in the relationship between tree growth and water availability, and perhaps even decouple the two, having large implications on how future climate change will impact forest productivity and carbon sequestration. Here, we examine the concurrent influence of the climatic water balance (precipitation minus potential evapotranspiration), CO2 concentrations, and sulfate and nitrogen deposition on radial tree growth, carbon isotopes, and intrinsic water-use efficiency (iWUE) for several hardwood tree species in the Midwestern United States. We found that when considering the simultaneous influence of these factors, the climatic water balance is the dominant influence on annual growth. Therefore, the recent pluvial period is the primary cause of the weakening relationship between radial growth and water availability. Even during pluvial periods, water availability is the primary control on growth, with increasing CO2 concentrations and decreased SO4 deposition being secondary factors. Importantly, the weakening in the climate-growth relationship is species specific, with Acer species having stable relationships with the climatic water balance, Liriodendron tulipifera showing a strengthening relationship, and Quercus species and Populus grandidentata exhibiting weakening. Thus, interannual variations in soil moisture unevenly impact tree growth and carbon sequestration. Our findings suggest that, despite recent pluvial conditions, increasing CO2 concentrations and decreasing acidic deposition have not buffered the impact of water availability on tree growth and carbon sequestration.
description: NOAA Template Raw Measurements file added 2020-09-03.
DOI: 10.25921/ha72-jv11
title: NOAA/WDS Paleoclimatology - Lake Qaupat, Baffin Island 5,800 Year Plant Wax and Geochemical Data

description: Paleo water isotope records can elucidate how the Arctic water cycle responded to past climate changes. We analyze the hydrogen isotope composition (δ2H) of plant-derived n-alkanoic acids (waxes) from Lake Qaupat, Baffin Island, Nunavut, Canada, to assess moisture sources and seasonality during the past 5.8 ka. We compare this record to a sedimentary ancient DNA (sedaDNA)-inferred vascular plant record from the same lake, aiming to overcome the uncertainty of plant community impacts on leaf waxes. As the sedaDNA record reveals a stable plant community after the colonization of Betula sp. at 6.1 ka, we interpret plant wax δ2H values to reflect climate, specifically mean annual precipitation δ2H. However, the distributions of n-alkanoic acid homologs suggest that aquatic mosses, which are not represented in the sedaDNA record, may become more abundant towards the present. Therefore, we cannot exclude the possibility that changes in the plant community cause changes in the plant wax δ2H record, particularly long-chain waxes, which become less abundant through this record. We find that Lake Qaupat mid-chain plant wax δ2H is enriched coincident with high Labrador Sea summer surface temperature, which suggests that local moisture sources in summer and early autumn have the greatest impact on precipitation isotopes in this region.
description: Geochemical data from sediments collected in Lake Qaupat, Baffin Island, Nunavut, Canada for the past 5,800 years.