cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5517/cc7t3lq
title: CCDC 232673: Experimental Crystal Structure Determination

description: Related Article: B.Goldfuss, T.Loschmann, F.Rominger|2004|Chem.-Eur.J.|10|5422|doi:10.1002/chem.200400273
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.25921/p7sv-ja75
title: NOAA/WDS Paleoclimatology - Cave KNI-51, Western Australia 2,200 Year Stalagmite Flood Layer Data

description: Assessing temporal variability in extreme rainfall events before the historical era is complicated by the sparsity of long-term "direct" storm proxies. Here we present a 2,200-y-long, accurate, and precisely dated record of cave flooding events from the northwest Australian tropics that we interpret, based on an integrated analysis of meteorological data and sediment layers within stalagmites, as representing a proxy for extreme rainfall events derived primarily from tropical cyclones (TCs) and secondarily from the regional summer monsoon. This time series reveals substantial multicentennial variability in extreme rainfall, with elevated occurrence rates characterizing the twentieth century, 850-1450 CE (Common Era), and 50-400 CE; reduced activity marks 1450-1650 CE and 500-850 CE. These trends are similar to reconstructed numbers of TCs in the North Atlantic and Caribbean basins, and they form temporal and spatial patterns best explained by secular changes in the dominant mode of the El Niño/Southern Oscillation (ENSO), the primary driver of modern TC variability. We thus attribute long-term shifts in cyclogenesis in both the central Australian and North Atlantic sectors over the past two millennia to entrenched El Niño or La Niña states of the tropical Pacific. The influence of ENSO on monsoon precipitation in this region of northwest Australia is muted, but ENSO-driven changes to the monsoon may have complemented changes to TC activity.
description: Stalagmite flood layer data from 7 stalagmites collected in cave KNI-51, Western Australia, at annual resolution for the past 2,200 years. Flood events are identified as mud layers in the stalagmites.  The data denote presence/absence of flood layers (0 = no flood layer; 1 = flood layer) and corresponding age.  Stalagmites were measured at 0.5 mm intervals.
DOI: 10.5517/cc7t3mr
title: CCDC 232674: Experimental Crystal Structure Determination

description: Related Article: B.Goldfuss, T.Loschmann, F.Rominger|2004|Chem.-Eur.J.|10|5422|doi:10.1002/chem.200400273
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.25921/p8pp-q352
title: NOAA/WDS Paleoclimatology - O'Donnell - Juna Downs Gully - CACO - ITRDB AUSL037

description: An understanding of past hydroclimatic variability is critical to resolving the significance of recent recorded trends in Australian precipitation and informing climate models. Our aim was to reconstruct past hydroclimatic variability in semi-arid northwest Australia to provide a longer context within which to examine a recent period of unusually high summer-autumn precipitation. We developed a 210-year ring-width chronology from Callitris columellaris, which was highly correlated with summer-autumn (Dec-May) precipitation (r = 0.81; 1910-2011; p < 0.0001) and autumn (Mar-May) self-calibrating Palmer drought severity index (scPDSI, r = 0.73; 1910-2011; p < 0.0001) across semi-arid northwest Australia. A linear regression model was used to reconstruct precipitation and explained 66% of the variance in observed summer-autumn precipitation. Our reconstruction reveals inter-annual to multi-decadal scale variation in hydroclimate of the region during the last 210 years, typically showing periods of below average precipitation extending from one to three decades and periods of above average precipitation, which were often less than a decade. Our results demonstrate that the last two decades (1995-2012) have been unusually wet (average summer-autumn precipitation of 310 mm) compared to the previous two centuries (average summer-autumn precipitation of 229 mm), coinciding with both an anomalously high frequency and intensity of tropical cyclones in northwest Australia and the dominance of the positive phase of the Southern Annular Mode.
description: NOAA Template Raw Measurements file added 2019-02-01.
DOI: 10.5517/cc7t3ns
title: CCDC 232675: Experimental Crystal Structure Determination

description: Related Article: B.Goldfuss, T.Loschmann, F.Rominger|2004|Chem.-Eur.J.|10|5422|doi:10.1002/chem.200400273
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.25921/pyfx-0v86
title: NOAA/WDS Paleoclimatology - San Lázaro Basin, Eastern Pacific 2,300 Year Sediment Geochemical Data

description: San Lázaro Basin (SLB) oceanographic record is highly sensitive to El Niño and the Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO) variability due to its location below the dynamic boundary between the northern, cooler and fresher waters of the California Current System (CCS) and the southern, warmer and saltier surface waters from subtropics and tropics. Warm sea surface temperatures (SST) and the ensuing stratified surface water column favor carbonate productivity, mostly dominated by the export of coccolithoforids as observed during El Niño events, while cool SSTs and a lesser stratified water column favor a relatively higher export of organic carbon. Here we show how during the last two millenia, the mechanisms that drive the organic carbon and carbonate export depend on the timescale considered. The organic carbon and carbonate records show opposite trends for the past 2 Kyr and in the multicentennial periodicities most probably as the result of the precessional forcing and decreasing insolation of the Northern Hemisphere, which has been shown to further affect the migration of the Inter Tropical Convergence Zone and the Polar Jet stream. In the shorter time-scales, interanual to centennial, the SLB records exhibit an ENSO-like variability; while decadal to multidecadal variability is correlated with instrumental and reconstructed PDO records. Here we further show how interannual variability seems to have increased during the Little Ice Age, most likely related to large ENSO events, in contrast with an apparent reduction in this type of variability between 400 to 1350 CE suggesting a changing sensitivity of the ENSO teleconnection in the southern CCS for the past 2 millennia.
description: Sediment geochemical data (carbonate percentage and Br/Si ratio) from 5 cores collected in the San Lázaro Basin (also called Soledad Basin) off Baja California, Mexico, in the Eastern Pacific Ocean  Sediment carbonate content is used as a proxy of water column stratification.
DOI: 10.5517/cc7t3pt
title: CCDC 232676: Experimental Crystal Structure Determination

description: Related Article: B.Goldfuss, T.Loschmann, F.Rominger|2004|Chem.-Eur.J.|10|5422|doi:10.1002/chem.200400273
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.25921/p02a-z980
title: NOAA/WDS Paleoclimatology - Interior Alaska 19 Year Tree Ring Stable Isotope Data

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: Tree ring indices and stable isotopes of carbon, oxygen and hydrogen; upper and base hillslope positions in Interior Alaska. Provided Keywords: 13C/12C, 2H/1H, 18O/16O, tree-ring, stable isotope, hillslope, topography, Alaska, boreal forest, climate, hydrology, Bonanza Creek LTER
IITRDB21
DOI: 10.5517/cc6s9bl
title: CCDC 202099: Experimental Crystal Structure Determination

description: Related Article: Eun-Young Choi, Kyungsoo Park, Cheol-Min Yang, Hyejin Kim, Jung-Ho Son, Soon W.Lee, Young Hee Lee, Dongwon Min, Young-Uk Kwon|2004|Chem.-Eur.J.|10|5535|doi:10.1002/chem.200400178
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.25921/p6kz-zz41
title: NOAA/WDS Paleoclimatology - WAIS Divide Ice Core 67.2-9.8 kaBP Continuous CH4 Data

description: The causal mechanisms responsible for the abrupt climate changes of the Last Glacial Period remain unclear. One major difficulty is dating ice-rafted debris deposits associated with Heinrich events: Extensive iceberg influxes into the North Atlantic Ocean linked to global impacts on climate and biogeochemistry. In a new ice core record of atmospheric methane with ultrahigh temporal resolution, we find abrupt methane increases within Heinrich stadials 1, 2, 4, and 5 that, uniquely, have no counterparts in Greenland temperature proxies. Using a heuristic model of tropical rainfall distribution, we propose that Hudson Strait Heinrich events caused rainfall intensification over Southern Hemisphere land areas, thereby producing excess methane in tropical wetlands. Our findings suggest that the climatic impacts of Heinrich events persisted for 740 to 1520 years. 
description: Ultra-high temporal resolution methane concentration data from West Antarctic Ice Sheet (WAIS) Divide (WD) ice core obtained by online, continuous technique.
DOI: 10.5517/cc6s9cm
title: CCDC 202100: Experimental Crystal Structure Determination

description: Related Article: Eun-Young Choi, Kyungsoo Park, Cheol-Min Yang, Hyejin Kim, Jung-Ho Son, Soon W.Lee, Young Hee Lee, Dongwon Min, Young-Uk Kwon|2004|Chem.-Eur.J.|10|5535|doi:10.1002/chem.200400178
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.25921/pywv-hs68
title: NOAA/WDS Paleoclimatology - San Juan Mountains, Colorado 15,000 Year Lake Dust Accumulation Data

description: Millions of people in the arid Southwest United States rely on snow-fed Colorado River water. Dust deposition on snow accelerates snowmelt, posing a challenge for water managers who also need to grapple with increased likelihood of drought due to climate change. Dust production is thought to increase during drought, but the impact of drought on dust deposition is unclear. To answer this question, total dust mass accumulation rate (DMAR) reconstructions were developed from sediment cores from three lakes in the San Juan Mountains, Colorado, spanning the last ~15,000 years. Monte-Carlo end-member analysis of particle size and elemental composition, which incorporates measurement and model uncertainties, was combined with age uncertainty to estimate DMAR for each lake. We also synthesize the records providing the first Holocene DMAR reconstruction for the region. The records show little relation between periods of frequent and severe drought (e.g. during medieval megadroughts) and periods of higher DMAR, although there is considerable uncertainty at short timescales. We find instead that sediment availability, modulated by natural or human-mediated geomorphic processes that generate sediment, and transport mechanisms are the key drivers. DMAR was highest during the Late Glacial-Interglacial Transition (LGIT, 15-11 kyr BP) and in the last 250 years, periods when sediment availability was enhanced. DMAR increased by 60% (16-85% 75% highest density region range) compared with the late-Holocene baseline starting in the 1770s and peaking in the 1840s, associated with the intensification of human activities. Human-induced dustiness also represents the highest interval of dust deposition in the last 11,000 years. Our results demonstrate that although the Colorado Plateau is naturally prone to dustiness, drought is a secondary driver of dust accumulation in the mountains. This suggests that land-use management decisions aimed at reducing land disturbance can mitigate future dust accumulation, despite projected increases in regional aridity.
description: Composite of dust mass accumulation rates for three lakes (Crater Lake, Columbine Lake, Clear Lake) located in the San Juan Mountains, Colorado, USA, for the past 15,000 years.
DOI: 10.5517/cc7yh1p
title: CCDC 236872: Experimental Crystal Structure Determination

description: Related Article: S.Mukherjee, T.Weyhermuller, E.Bill, P.Chaudhuri|2004|Eur.J.Inorg.Chem.|2004|4209|doi:10.1002/ejic.200400346
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc849th
title: CCDC 242476: Experimental Crystal Structure Determination

description: Related Article: A.Trosch, H.Vahrenkamp|2004|Z.Anorg.Allg.Chem.|630|2031|doi:10.1002/zaac.200400249
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.25921/prac-rs89
title: NOAA/WDS Paleoclimatology - Copenheaver - Stroubles Creek - QUAL - ITRDB VA035

description: Habitat specificity of tree species has traditionally been determined by identifying synchronous abiotic characteristics and species presence on the landscape. On a local scale this identifies many species as specialists; however, on a regional scale, most tree species are classified as generalists because individual species are present across a wide-range of edaphic and topographic conditions. To improve our ecological understanding of habitat specificity in trees, we classified white oak (Quercus alba) based on two performance currencies: responsiveness to climate and maximum tree age. We sampled tree rings from both ridge and valley stands in the southern Appalachian Mountains to contrast the dendroclimatic response at these topographic positions. White oak had radial growth responses to Palmer Drought Severity Index, temperature, and precipitation that was not dependent upon topographic position (ridge vs. valley), suggesting that white oak is a generalist species. A dendroclimatic response that is not dependent upon topographic position should allow white oak to adapt readily to climatic shifts that span a range of environmental conditions. Tree age has served as a successful performance currency in relatively undisturbed forests; however, in the southern Appalachian Mountains where there is a long history of human disturbance, maximum tree age revealed more about regional logging history than about white oak habitat specificity. Understanding habitat specificity of plant species improves predictions of species' response to environmental change. Traditionally trees have been classified based on occurrence on the landscape; however, in heavily-impacted forests occurrence is a reflection of land-use history. Dendroclimatology offers a more accurate tool to assess a tree's habitat specificity and was successfully applied in several ridge and valley sites in the Appalachian Mountains to identify white oak as a generalist species.
description: NOAA Template Raw Measurements file added 2019-02-08.
DOI: 10.5517/cc859sh
title: CCDC 243436: Experimental Crystal Structure Determination

description: Related Article: A.Hammerschmidt, S.Bonmann, M.Lage, B.Krebs|2004|Z.Anorg.Allg.Chem.|630|2035|doi:10.1002/zaac.200400265
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.25921/pa5j-sa18
title: NOAA/WDS Paleoclimatology - Subantarctic Atlantic Ocean Foraminifera-bound d15N, Iron and Alkenone Flux Data for the last 160,000 years

description: John H. Martin, who discovered widespread iron limitation of ocean productivity, proposed that dust-borne iron fertilization of Southern Ocean phytoplankton caused the ice age reduction in atmospheric carbon dioxide (CO2). In a sediment core from the Subantarctic Atlantic, we measured foraminifera-bound nitrogen isotopes to reconstruct ice age nitrate consumption, burial fluxes of iron, and proxies for productivity. Peak glacial times and millennial cold events are characterized by increases in dust flux, productivity, and the degree of nitrate consumption; this combination is uniquely consistent with Subantarctic iron fertilization. The associated strengthening of the Southern Ocean's biological pump can explain the lowering of CO2 at the transition from mid-climate states to full ice age conditions as well as the millennial-scale CO2 oscillations
description: Foraminifera-bound d15N, iron and alkenone fluxes measured in ODP Site 1090 over the past glacial cycle.
    Provided Keywords: Iron Fertilization, Carbon Dioxide, Southern Ocean, Nitrogen Isotopes, Alkenones
DOI: 10.5517/cc7zssr
title: CCDC 238135: Experimental Crystal Structure Determination

description: Related Article: J.N.Moorthy, P.Mal, N.Singhal, P.Venkatakrishnan, R.Malick, P.Venugopalan|2004|J.Org.Chem.|69|8459|doi:10.1021/jo048482a
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.5517/cc859tj
title: CCDC 243437: Experimental Crystal Structure Determination

description: Related Article: A.Hammerschmidt, S.Bonmann, M.Lage, B.Krebs|2004|Z.Anorg.Allg.Chem.|630|2035|doi:10.1002/zaac.200400265
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
DOI: 10.25921/pvq7-km05
title: NOAA/WDS Paleoclimatology - Northeast Brazil Heinrich Stadial 4 Speleothem d18O Data

description: The growth intervals of stalagmites from Northeast (NE) Brazil provide precise information on the timing of pluvial periods associated with the southward shift of the Intertropical Convergence Zone (ITCZ) during Heinrich Stadials (HS). Using 230Th dating and annual band counting, we constrained the timing of the pluvial period associated with HS4 to occur between 40.06 ± 0.11 and 38.38 ± 0.10 thousand years before present (kyr B.P.), coinciding with the interval between the end of Greenland Interstadial (GIS)/Chinese Interstadial (CIS) 9 and GIS/CIS 8. Oxygen isotope analysis shows a close anti-correlation between NE Brazil wet periods and East Asian monsoon intensity recorded in Hulu Cave, supporting the hypothesis of a southerly migration of the global ITCZ during HS4. The pluvial anomaly can be divided into three phases, starting with a precursor, less intense pluvial interval (phase 1) between 40.06 ± 0.11 and kyr B.P., likely correlative to the cool phase of the North Atlantic immediately before the partial collapse of the Laurentide Ice Sheet (LIS). This phase ends abruptly (<30 yr) and is followed by an intense pluvial phase (phase 2) that spans approximately 5 centuries. Luminescent couplets are identified in all samples between 39.50 ± 0.10 and 39.41 ± 0.10 kyr B.P., and are interpreted as a period of two rainy seasons per year during which the southernmost extent of the inland West Atlantic ITCZ reached south of our study site (10 S). Following the end of phase 2 at 39.07 ± 0.32 kyr B.P., intermittent speleothem growth suggests intermittent rainfall over NE Brazil (phase 3) until the abrupt onset of GIS/CIS 8 at 38.38 ± 0.10 kyr B.P. The phases identified in NE Brazilian stalagmites agree with the three-phased variation in low-latitude proxies registered in Northern Greenland, and are consistent with changes in methane concentrations recorded in the West Antarctic Ice Sheet (WAIS) Divide. The synchronicity of these distant records suggests a multi-phased response of tropical atmospheric circulation during HS4. The timescales surrounding the LIS collapse, as inferred from our precisely dated stalagmites, are on the same order as recent predictions for the impending collapse of the WAIS and may therefore serve as a past analogue.
description: High-resolution speleothem oxygen isotope (d18O) data plus CFLM images from 3 stalagmites collected in 2 northeastern Brazil caves (Toca da BoaVista and Toca da Barriguda) over Heinrich Stadial 4 (~39ka)
DOI: 10.5517/cc7zsrq
title: CCDC 238134: Experimental Crystal Structure Determination

description: Related Article: J.N.Moorthy, P.Mal, N.Singhal, P.Venkatakrishnan, R.Malick, P.Venugopalan|2004|J.Org.Chem.|69|8459|doi:10.1021/jo048482a
description: An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.