cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.25921/zc9j-yg45
title: NOAA/WDS Paleoclimatology - Symbiont photosynthetic competency and its effect on boron proxies in planktic foraminifera, Puerto Rico, Spring 2010 and 2015, and Santa Catalina Island, Summer 2013

description: Boron proxies in the calcium carbonate shells of planktic foraminifera are sensitive to seawater acidity, but B/Ca ratios and isotopic composition (i.e. d11B) recorded by different foraminifer species grown under identical environmental conditions differ significantly and systematically. Specifically, the symbiont-bearing Globigerinoides ruber records higher B/Ca and d11B than Trilobatus sacculifer and Orbulina universa, and it has been hypothesized that these differences are caused by species-specific rates of symbiont photosynthesis and habitat depth. According to this hypothesis, greater symbiont photosynthesis elevates the microenvironmental pH of G. ruber to a greater degree than in T. sacculifer and O. universa. Here we test this hypothesis by applying fast repetition rate fluorometry (FRRF), Chlorophyll a quantification, and symbiont counts in laboratory grown specimens of G. ruber, T. sacculifer and O. universa to study species-specific differences in symbiont photosynthetic competency. In addition, we report B/Ca shell profiles measured by laser ablation on the same specimens previously monitored by FRRF, and d11B data of discrete populations of all three species grown under high and low light conditions in the laboratory. While the light experiments document that symbiont photosynthesis elevates pH and/or d11B in the calcifying microenvironment of all three foraminifer species, the FRRF, Chl. a and symbiont abundance data are relatively uniform among the three species and do not scale consistently with intra shell B/Ca, or with observed species-specific offsets in B/Ca or d11B. Implications of these findings for foraminiferal physiology and biomineralization processes are discussed.
description: Research conducted at the Marine Lab of the Universidad de Puerto Rico, La Parguera and Wrigley Institute of Environmental Studies, Santa Catalina Island, CA
       Provided Keywords: symbiont photosynthesis, planktic foraminifera, B/Ca, boron isotopes, fluorescence, Chlorophyll a
DOI: 10.25921/z1cy-5t55
title: NOAA/WDS Paleoclimatology - Cape Basin, South Atlantic SST Over the Past 160ky

description: Multiple geochemical analyses were performed in order to test the fidelity of alkenone paleotemperature reconstructions in southern Cape Basin sediment drifts. Sea surface temperatures (SSTs) derived from the alkenone unsaturation ratio, U37k', in two drift cores (TN057-21 and Ocean Drilling Program Site 1089) are nearly identical during the interval of overlapping analyses, MIS 4-5c. SSTs in a nearby nondrift core (TN057-6) covary with those in core TN057-21 throughout MIS 1-5c. While climatological SSTs overlying TN057-21 and TN057-6 are similar and consistent with reconstructed Holocene SSTs in the nondrift core, surface waters overlying TN057-21 are ~6C colder than Holocene alkenone SSTs in the drift core. Temperatures remain ~6C warmer in TN057-21 relative to TN057-6 during the ~100 kyr duration of the records. We hypothesize that alkenone-derived SSTs in TN057-21 are higher than climatological SSTs in the overlying surface water and those in TN057-6 as a result of the winnowing and focusing of sedimentary alkenones produced in warmer waters to the north. Climatological SSTs in the central and northern Cape Basin are 16-20C. A 1.5% offset of fine fraction d18O values relative to planktonic foraminifera in TN057-21 supports this hypothesis. Temporal changes in sediment focusing were evaluated directly using uranium series radioisotopes. While higher sediment focusing factors would be expected to result in higher alkenone-derived SSTs if sediment advection were the primary control on down-core changes in alkenone-derived SSTs, 230Th-derived focusing factors indicate no such correlation exists. We conclude that alkenone paleotemperature reconstructions from southern Cape Basin drifts reliably record regional SST variations in the Cape Basin.
description: Some of these data were submitted previously on different age models for later publications. The related studies can be found at https://www.ncdc.noaa.gov/paleo-search/study/16464 and https://www.ncdc.noaa.gov/paleo-search/study/2651
     Provided Keywords: alkenones, Cape Basin, drift deposit, quaternary, ice age
DOI: 10.25921/zgxg-0y44
title: NOAA/WDS Paleoclimatology - East China Sea, northern Okinawa Trough grain-size and mass accumulation rate data over the last 400,000 years

description: The Quaternary East Asian summer rainfall evolution reconstructed with the Chinese speleothem δ18O records shows the consistency throughout the region of East Asia, and has long been considered equivalent to the monsoon intensity. Its variation and teleconnection with global climate were usually interpreted by the meridional shift of the intertropical convergence zone (ITCZ). However, many other proxy records, climate simulations and meteorological observations suggest the inconsistent rainfall patterns in the different regions of East Asia on multi-timescales. Such spatial heterogeneity in Quaternary East Asian summer rainfall indicates that the hydroclimate in this region is not fully paced by the migration of the ITCZ. Here, we report a sediment record of rainfall evolution during the last 400 ka in the northern East China Sea, and this record, in combination with a transient climate model simulation, indicates an out-of-phase relationship between rainfall over middle-southeastern East Asia and northern and southwestern East Asia on the precession band, with high boreal summer insolation corresponding to the increased rainfall intensity in the northern and southwestern East Asia, however, decreased rainfall intensity in the middle East Asia. We attribute this regional heterogeneity in East Asian rainfall to the reorganization of the Hadley circulation, including shifts in the ascending branch (ITCZ) and descending branch (subtropical westerly jet), in response to changes in the hemispheric meridional temperature gradient. Our results highlight the crucial role of the Hadley circulation in the East Asian hydroclimate and have important implications for future climate projections.
description: Sediment flux from southern Japan in northern East Asian marginal sea calculated based on grain-size as a proxy for East Asian summer rainfall change.
   Provided Keywords: East Asian summer rainfall, paleoclimate reconstruction, East China Sea, IODP Site U1429
DOI: 10.25921/z8vm-sb96
title: NOAA/WDS Paleoclimatology - Equatorial Pacific Line Islands 282ka Individual Foram Mg/Ca SST Data

description: The El Nino Southern Oscillation (ENSO) is highly dependent on coupled atmosphere-ocean interactions and feedbacks, suggesting a tight relationship between ENSO strength and background climate conditions. However, studies of ENSO variability over the past 25,000 years disagree on the extent to which background climate state determines ENSO behavior.  Here we present reconstructions of El Nino amplitude from individual foraminifera distributions at discrete time intervals over the past ~285,000 years across widely varying atmospheric CO2 levels, global ice volume and sea level, and orbital insolation forcing.  Our results show a strong correlation between El Nino amplitude and tropical Pacific Ocean mixed-layer thickness, indicating upwelling feedbacks are the key factor controlling ENSO strength on these time scales. We observe reduced El Nino amplitude only during May-July high-insolation intervals, suggesting insolation-forced warming of tropical Pacific thermocline source waters in the southern hemisphere weakens the upwelling feedback and El Nino strength. Our results indicate the primacy of the upwelling feedback in shaping ENSO behavior across many different background states, suggesting accurate modeling of this
description: Trace metal ratios (Mg/Ca) from individual specimens of Globigerinoides sacculifer from Central Equatorial Pacific Line Islands sediment cores ML1208-17PC and ML1208-14MC1.
DOI: 10.15468/dl.x8z9fz
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
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 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024846-251009101135966/datasets/export for details.
DOI: 10.25921/z65y-9p88
title: NOAA/WDS Paleoclimatology - Hughes - Kivach Nature Reserve - PCAB - ITRDB RUSS271

description: We report new data on tree-ring growth in northern European Russia, a region with a hitherto relatively sparse tree-ring network. We explore its associations with climate variability. Areas, sampling locations and trees were selected for representativeness rather than climate sensitivity. Using tree rings from 651 conifers from six widely dispersed areas we show strong intercorrelation between trees within each major conifer species within and between areas. Regional composite tree-ring series for spruce and pine contain a major fraction of decadal and multidecadal variability. The most likely driver of this common variability is interannual to multidecadal climate variability. Gridded monthly instrumental climate data for the period 1902-2008, particularly mean temperature and total precipitation, were tested as predictors of each local species-specific tree-ring site chronology. The most consistent pattern emerged for spruce at all but the southernmost area. Cool and moist summers the year before growth were consistent drivers of spruce ring growth throughout the period, with no change in recent decades. Self-calibrating Palmer Drought Severity Index for prior summer was also a strong and consistent driver of spruce ring growth. For pine, there was a weaker but similarly stable association between larger rings and warm, moist conditions, in this case in the current summer. These associations were also identified at multidecadal time scales, particularly for spruce. On the other hand, the specific role of moisture variability in determining interannual to multidecadal variability in tree growth in this high latitude region raises questions about the relative vulnerability of spruce and pine there under global warming.
description: NOAA Template Raw Measurements file added 2020-01-15.
DOI: 10.25921/zaa4-xr50
title: NOAA/WDS Paleoclimatology - Therrell - Wildcat Canyon - QUSP - ITRDB IL025

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: Starved Rock State Park, October 31st, 2014, Q. alba, Q. rubra NOAA Template Raw Measurements file added 2020-03-09.
DOI: 10.15468/dl.3nhua6
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
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 "TaxonKey is one of (Piciformes)",
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 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1980",
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 }
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 "Geometry POLYGON((170 0,180 0,180 10,170 10,170 0))"
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 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024844-251009101135966/datasets/export for details.
DOI: 10.25921/zrqm-wh62
title: NOAA/WDS Paleoclimatology - de Graauw - Kee Cabin - LITU - ITRDB WV021

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: Chronology derived from log building (Kee Cabin; KML). NOAA Template Raw Measurements file added 2020-03-09.
DOI: 10.15468/dl.8nrecb
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Monoplacophora)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1980",
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 }
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 "Geometry POLYGON((-110 50,-100 50,-100 60,-110 60,-110 50))"
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 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024845-251009101135966/datasets/export for details.
DOI: 10.25921/zzyn-5859
title: NOAA/WDS Paleoclimatology - de Graauw - Zigafuss House - QUAL - ITRDB WV031

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: Chronology derived from log building (Zigafuss House; ZH). NOAA Template Raw Measurements file added 2020-03-09.
DOI: 10.15468/dl.gqe2d3
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Piciformes)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "Year is greater than or equal to 1980",
 "OccurrenceStatus is Present",
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 "not" : {
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 "is one of (Fossil, Living Specimen)"
 ]
 }
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 "Geometry POLYGON((150 0,160 0,160 10,150 10,150 0))"
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 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024848-251009101135966/datasets/export for details.
DOI: 10.15468/dl.zmdysh
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
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 "TaxonKey is one of (Gastropoda)",
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 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0024850-251009101135966/datasets/export for details.
DOI: 10.25921/zrm0-ry90
title: NOAA/WDS Paleoclimatology - Pompeani fire data from Copper Falls Lake, Great Lakes region - IMPD USCFL001

description: The rise in mercury concentrations in lake sediment deposited over the last ~150 years is widely recognized to have resulted from human activity. However, few studies in the Great Lakes region have used lake sediment to reconstruct atmospheric mercury deposition on millennial time scales. Here we present a 9000-year mercury record from sediment in Copper Falls; a small closed-basin lake on the Keweenaw Peninsula. Prior to abrupt increases in the 19th and 20th centuries, mercury remains at relatively low concentrations for the last 9000 years. Higher mercury fluxes in the early Holocene (3.4 ± 1.1 µg m–2 yr–1) are attributed to drier conditions and greater forest fire occurrence. The gradual decline in mercury flux over the middle to late Holocene (1.9 ± 0.2 µg m–2 yr–1) is interpreted to reflect a transition to wetter conditions, which reduced forest fires, and promoted the development of soil organic matter and deciduous forests that sequestered natural sources of mercury. The Copper Falls Lake record highlights the sensitivity of watersheds to changes in mercury inputs from both human and natural forcings, and provides millennial-scale context for recent mercury contamination that will aid in establishing baseline values for restoration efforts.
description: Contact person:	David Pompeani
Sample storage location:	University of Pittsburgh, Department of Geology and Environmental Science.
Entity name:	Copper Falls Lake
Sampling date:	2011
Lake surface area (km^2):	0.3
Lake watershed area (not including surface area)(km^2):	0.4
Location description:	Keweenaw Peninsula
State/Province:	Michigan
Core Diameter(cm):	6.6
Water depth(cm):	300
Sampling device:	1 cm^3 piston sampler
Instrumentation:	binocular microscope
Analysis method:	Sediment subsamples (1 cm^3) for charcoal analysis were measured continuously down core at 1-cm intervals. Prior to counting, the samples were treated with 7% H2O2 overnight at 60C in 20 mL HDPE scintillation vials, shaken briefly by hand, and sieved with tap water at 125 μm to isolate the larger charcoal particulates. Charcoal concentration is defined as >125 um charcoal counts per cm^3 of wet sediment. Charcoal accumulation rates (CHAR) were calculated by multiplying charcoal concentration by sedimentation rate. CHAR background levels were estimated using a 500-year moving average window.
DOI: 10.25921/za0e-d468
title: NOAA/WDS Paleoclimatology - Mitchell - Uwharrie National Forest - PIPA - ITRDB NC028

description: We examined short- and long-term changes in precipitation event types using instrumental (1940-2018) and tree-ring (1790-2018) data from North Carolina, USA. We documented the amount and frequency of summer (July-September) precipitation events using daily weather station data. Stationary front precipitation (SFP) represented 71% of total summer rainfall and SFP and convective uplift combined (i.e., quasi-stationary precipitation, QSP) represented 87%. SFP (r = 0.52, p < 0.01) and QSP (r = 0.61, p < 0.01) precipitation reconstructions from a montane longleaf pine latewood chronology both recorded significant declines during 1940-2018, matching the instrumental record. Conversely, no significant change in either SFP or QSP occured during the full reconstruction indicating the instrumental decline was unmatched throughout 1790-1939. Our method demonstrates that variations in latewood growth can be attributed to specific precipitation event types and that the relative contribution of each event type can be quantified over a multi-century period.
description: Latewood width measurements from Uwharrie National Forest NOAA Template Raw Measurements file added 2020-05-11.
DOI: 10.25921/zpev-3c20
title: NOAA/WDS Paleoclimatology - Miri-Sibuti Coral Reefs National Park (Sarawak, Borneo, Malaysia), Sr/Ca and d18O Data from 1982-2016 CE

description: Extreme climate events, such as the El Niños in 1997/1998 and 2015/16, have led to considerable forest loss in the Southeast Asian region following unprecedented drought and wildfires. In Borneo, the effects of extreme climate events have been exacerbated by rapid urbanization, accelerated deforestation and soil erosion since the 1980s. However, studies quantifying the impact of interannual and long-term (>3 decades) climatic and anthropogenic change affecting Borneo's coastal and coral reef environments are lacking. Here, we used coral cores collected in Miri-Sibuti Coral Reefs National Park, Sarawak (Malaysia) to reconstruct the spatio-temporal dynamics of sea surface temperature and oxygen isotopic composition of seawater from 1982 to 2016, based on paired oxygen isotope and Sr/Ca measurements. The results revealed rising sea surface temperatures of 0.26 ± 0.04°C per decade since 1982. Reconstructed d18Osw displayed positive excursion during major El Niño events of 1983, 1997/98 and 2015/16, indicating drought conditions with less river runoff, rainfall and higher ocean salinities. La Niñas were generally associated with lower d18Osw. We observed a long-term shift from more saline conditions between 1982 and 1995 towards less saline conditions after 1995, which are in agreement with the regional freshening trend, punctuated by saline excursion during El Niños. The decadal shifts were found to be driven by the Pacific Decadal Oscillation (PDO). This study provides the first long-term data on El Niño Southern Oscillation (ENSO)-driven synchrony of climate impacts on both terrestrial and marine ecosystems in northern Borneo. Our results suggest that coral records from northern Borneo are invaluable archives to detect regional ENSO and PDO impacts, and their interaction with the Asian-Australian monsoon, on the hydrological balance in the southern South China Sea beyond the past three decades.
description: Miri-Sibuti Coral Reefs National Park, Sarawak, Borneo site locations- Anemone's Garden: 4.292169 N, 113.825911 E,-10m; Eve's Garden: 4.343347 N, 113.898317 E, -5m; Age-depth models for each core were established using the software AnalySeries2.0 and the NOAA AVHRR-OISSTv2 High Resolution Dataset for a 0.25° grid. The chronology was generated based on the pronounced seasonal cycle of Sr/Ca ratios.
    Provided Keywords: corals, d18O, Sr/Ca, SST, SSS, ENSO
DOI: 10.25921/znwg-st34
title: NOAA/WDS Paleoclimatology - Pompa-García - Santa Bárbara Forest - ABDU - ITRDB MEXI116

description: A decline in productivity and radial growth in conifer forests from mesic areas has been associated with increased drought stress induced by climate warming. Nevertheless, studies showing how vulnerable tree species will be in response to forecasted warming conditions are scarce in such mesic habitats. Here we address this issue by analyzing how growth responds to drought and to observed and projected climate conditions in a conifer forest from northern Mexico, which is a hotspot of conifer diversity. We quantify the trends in radial growth (quantified as basal area increment, BAI) of three species (Abies durangensis, Picea chihuahuana, Cupressus lusitanica) using dendrochronology and a process-based model of tree growth. Growth decreased in A. durangensis and P. chihuahuana from the late 1980s onwards in response to warmer and drier conditions, whereas C. lusitanica growth showed very low sensitivity to precipitation and increased as temperature did. Winter-spring dry conditions adversely affected the growth of A. durangensis and P. chihuahuana. Our modeling approach anticipates growth reductions and an increase in the vulnerability of A. durangensis and the endangered P. chihuahuana against the warmer and more arid conditions predicted after the 2050s. Future warmer and drier climatic conditions could reduce the productivity and lead to growth decline of these mesic conifer forests triggering dieback episodes in highly drought-sensitive species as A. durangensis and P. chihuahuana.
description: MEPA site, Santa Barbara, Durango NOAA Template Raw Measurements file added 2020-03-09.