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  • 1
    Digitale Medien
    Digitale Medien
    Regional insolation forcing of late Quaternary climate change in the Southern Hemisphere (2005)
    [s.l.] : Nature Publishing Group
    Nature 436 (2005), S. 242-245 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] In agreement with the Milankovitch orbital forcing hypothesis it is often assumed that glacial–interglacial climate transitions occurred synchronously in the Northern and Southern hemispheres of the Earth. It is difficult to test this assumption, because of the paucity of long, continuous ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/nature03826
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    A national survey of airborne pollen and grass flowering in New Zealand, with implications for respiratory disorder (1995)
    Springer
    Aerobiologia 11 (1995), S. 239-252 
    Details
    ISSN: 1573-3025
    Schlagwort(e): Aerobiology ; Pollen allergy ; Grasses ; New Zealand ; Phenology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Airborne pollen and spore levels were monitored at seven sites in New Zealand using the Intermittent Cycling Rotorod sampler during the summer of 1988/1989. Grasses formed the major component of atmospheric pollen levels during spring and summer at every locality. Peak levels of grass and total pollen occurred during December or late November, with a slight latitudinal lag apparent at the more southern sites. Highest levels were recorded at the smaller rural centres of Gore and Kaikohe and the lowest at the larger urban centres of Auckland, Christchurch and Wellington. We make a first approximation of the likely risk to hayfever and allergic asthma patients at each of the seven centres. For example, significantly higher grass pollen levels were experienced at Kaikohe on 44% and 65% of days during November and December, compared with just 15% and 8% at Auckland. By recording the flowering seasons of the principal allergenic grass species at each locality, we determined the potentially allergenic grasses contributing to peak pollen levels, the most ubiquitous being tall fescue (Festuca arundinacea Schreb.), ryegrass (Lolium perenne L.,L. multiflorum Lam.), cocksfoot (Dactylis glomerata L.), Yorkshire fog (Holcus lanatus L.) and sweet vernal (Anthoxanthum odoratum L.).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02447204
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  • 3
    Digitale Medien
    Digitale Medien
    Monitoring biogeographical response to climate change: The potential role of aeropalynology (1999)
    Springer
    Aerobiologia 15 (1999), S. 87-94 
    Details
    ISSN: 1573-3025
    Schlagwort(e): aeropalynology ; bio-indicators ; climate change ; pollen season
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract To test models predicting biological reponse to future climate change, it is essential to find climatically-sensitive, easily monitored biological indicators that respond to climate change. Routine monitoring of airborne pollen, now undertaken on a near-global basis, could be adapted for this purpose. Analysis of spatial and seasonal variations in pollen levels in New Zealand suggests that the timing of onset and peak abundance of certain pollen taxa should be explored as possible bio-indicators of climate change. The onset of the airborne grass pollen season during the summer of 1988/89 varied consistently with latitude, and hence temperature, with the season in Southland commencing 8--9 days after Northland. However, these patterns were only apparent after sampling sites were separated into two groups reflecting predominantly urban or rural pollen sources. A less consistent north to south trend was apparent in the frequency of high (30 grains/m3) grass pollen levels, with high levels frequent in North Island localities in November, December and January and in southern localities during December and January. The successive onset of pollen seasons for the principal tree species during the spring-to-early summer warming interval may also be a useful bio-indicator of climate change. As well as assisting forecasts of the onset of the pollinosis season, these biogeographical patterns, reflecting climatic variation with latitude, suggest that routine aeropalynological monitoring might provide early signals of vegetation response to climate change. These conclusions are supported by recent investigations of long-term aeropalynological datasets in Europe that indicate earlier onset of pollen seasons in response to recent global warming.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007595615115
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  • 4
    facet.materialart.
    Unbekannt
    A continuous 5300-yr Holocene cryptotephrostratigraphic record from northern New Zealand and implications for tephrochronology and volcanic hazard assessment (2006)
    SAGE Publications
    In:  The Holocene, 16 (2). pp. 173-187.
    Details
    Publikationsdatum: 2017-05-19
    Beschreibung: A continuous ∼5280 calendar (cal.) yr long cryptotephrostratigraphic record of a peat core from northern New Zealand demonstrates that cryptotephra studies can enhance conventional tephra records by extending the known distribution of ash fall and enabling re-assessment of volcanic hazards. A systematic sampling strategy was used to locate peaks in glass-shard concentrations and to determine loci of individual geochemical populations, and a palynological method involving spiking samples with Lycopodium spores was adapted to facilitate accurate counting of glass-shard concentrations. Using glass shard major element compositions, and a core chronology based on eight AMS 14C ages and two visible macroscopic tephra layers, Taupo Tephra (Unit Y) (1688-1748 cal. BP) and Tuhua Tephra (6800-7230 cal. BP) (2cr-age ranges), four cryptotephras were correlated with known eruptions: Whakaipo (Unit V) (2743-2782 cal. BP), Stent (Unit Q) (4240-4510 cal. BP), and Unit K (4970-5290 cal. BP), erupted from Taupo Volcanic Centre, and Whakatane Tephra (5470-5600 cal. BP) erupted from Okataina Volcanic Centre. Mixed glass populations were found in the core, most likely an artefact of post-depositional remobilization of shards vertically (both up and down) in the peat or on its surface by wind, or a result of closely spaced eruption events, or a combination of these. A secondary glass population identified within the macroscopic Taupo Tephra was tentatively attributed to either an earlier phase within that eruption or to mixing with a slightly older Taupo-derived eruptive or (less likely) a currently unknown Okataina-derived eruptive. These results indicate that, in the absence of continuous cryptotephrostratigraphic analysis, a peak in shard concentrations may not in itself be indicative of the ‘true’ stratigraphic (ie, isochronous) level of a tephra layer. For cryptotephra studies of peat cores, we recommend (1) using a detailed sampling strategy for the analysis of distal tephra-derived glass to detect and account for any mixed populations and possible vertical spread of glass shards through the peat, and (2) analysing more shards from larger samples to help ‘capture’ sparsely represented cryptic andesitic tephra deposits.
    Materialart: Article , PeerReviewed
    Format: text
    Format: text
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  • 5
    facet.materialart.
    Unbekannt
    Age determination and radiometric dates of cores from Okarito Pakihi in Australia (2005)
    PANGAEA
    In:  Supplement to: Vandergoes, Marcus J; Newnham, Rewi M; Preusser, Frank; Hendy, Chris H; Lowell, Thomas V; Fitzsimons, Sean J; Hogg, Alan G; Kasper, Haino Uwe; Schlüchter, Christian (2005): Regional insolation forcing of late Quaternary climate change in the Southern Hemisphere. Nature, 436, 242-245, https://doi.org/10.1038/nature03826
    Details
    Publikationsdatum: 2023-07-29
    Beschreibung: In agreement with the Milankovitch orbital forcing hypothesis (Imbrie et al., 1993) it is often assumed that glacial-interglacial climate transitions occurred synchronously in the Northern and Southern hemispheres of the Earth. It is difficult to test this assumption, because of the paucity of long, continuous climate records from the Southern Hemisphere that have not been dated by tuning them to the presumed Northern Hemisphere signals (Lynch-Stieglitz, 2004). Here we present an independently dated terrestrial pollen record from a peat bog on South Island, New Zealand, to investigate global and local factors in Southern Hemisphere climate changes during the last two glacial-interglacial cycles. Our record largely corroborates the Milankovitch model of orbital forcing but also exhibits some differences: in particular, an earlier onset and longer duration of the Last Glacial Maximum. Our results suggest that Southern Hemisphere insolation may have been responsible for these differences in timing. Our findings question the validity of applying orbital tuning to Southern Hemisphere records and suggest an alternative mechanism to the bipolar seesaw for generating interhemispheric asynchrony in climate change.
    Schlagwort(e): HAND; Okarito_Pakihi; Sampling by hand
    Materialart: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 6
    facet.materialart.
    Unbekannt
    (Table 3) Summary data of single aliquot luminescence dating of cores from Okarito Pakahi in Autralia (2005)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-29
    Schlagwort(e): Age, dated; Age, dated standard deviation; Age, optical stimulated luminescence (OSL); Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Dose rate; Dose rate, standard deviation; Equivalent dose; HAND; Infrared laser absorption specrometer, IRLS; Okarito_Pakihi; Potassium; Potassium, standard deviation; Replicates; Sample, optional label/labor no; Sample code/label; Sampling by hand; Thorium; Thorium, standard deviation; Uranium; Uranium, standard deviation; Water content, wet mass
    Materialart: Dataset
    Format: text/tab-separated-values, 506 data points
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    DATA PANGAEA
  • 7
    facet.materialart.
    Unbekannt
    (Table 2) Summary data of multiple aliquot luminescence dating of cores from Okarito Pakihi in Autralia (2005)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-29
    Schlagwort(e): Age, dated; Age, dated standard deviation; Age, thermo luminescence (TL); Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Dose rate; Dose rate, standard deviation; Equivalent dose; HAND; Infrared laser absorption specrometer, IRLS; Okarito_Pakihi; Potassium; Potassium, standard deviation; Sample, optional label/labor no; Sample code/label; Sampling by hand; Thorium; Thorium, standard deviation; Uranium; Uranium, standard deviation; Water content, wet mass
    Materialart: Dataset
    Format: text/tab-separated-values, 213 data points
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    DATA PANGAEA
  • 8
    facet.materialart.
    Unbekannt
    (Table 1) Radiometric dates of cores from Okarito Pakihi in Australia (2005)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-29
    Schlagwort(e): Age, 14C AMS; Age, 14C calibrated, CALIB 4.3 (Stuiver et al., 1998); Age, dated; Age, dated, range, maximum; Age, dated, range, minimum; Age, dated material; Age, dated standard deviation; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; HAND; Okarito_Pakihi; Sample, optional label/labor no; Sample code/label; Sampling by hand
    Materialart: Dataset
    Format: text/tab-separated-values, 721 data points
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    DATA PANGAEA
  • 9
    facet.materialart.
    Unbekannt
    CLAM age model and microcharcoal of sediment core Kohuora (2017)
    PANGAEA
    Details
    Publikationsdatum: 2024-04-20
    Schlagwort(e): Abrupt Climate Changes and Environmental Responses; Accumulation model; ACER; Calendar age; Calendar age, maximum/old; Calendar age, minimum/young; Charcoal; Classical age-modeling approach, CLAM (Blaauw, 2010); DEPTH, sediment/rock; Kohuora; Sample ID; Type of age model; Unit
    Materialart: Dataset
    Format: text/tab-separated-values, 804 data points
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    DATA PANGAEA
  • 10
    facet.materialart.
    Unbekannt
    CLAM age model and pollen profile of sediment core Okarito_Pakihi (2017)
    PANGAEA
    Details
    Publikationsdatum: 2024-04-20
    Schlagwort(e): Abrupt Climate Changes and Environmental Responses; Acaena; ACER; Adiantum; Alepis; Apiaceae; Aristotelia; Ascarina; Asplenium; Astelia; Asteraceae; Baumea-type; Blechnum; Bulbinella; Callitriche; Calocedrus; Caryophyllaceae; Casuarina; Centrolepidaceae; cf. Podocarpus; Chenopodiaceae; Coprosma; Coriaria; Counting, palynology; Cyathea dealbata; Cyathea medullaris; Cyathea smithii; Cyperaceae; Dacrycarpus; Dacrydium cupressinum; DEPTH, sediment/rock; Dicksonia; Dicksonia lanata; Discaria; Dracophyllum; Drosera; Elaeocarpus; Empodisma; Euphrasia; Forstera; Fuchsia; Gaultheria; Gentiana; Gleichenia; Gonocarpus; Grammitis; Griselinia; Gunnera; Halocarpus; HAND; Hebe; Histiopteris; Hoheria; Hymenophyllum; Hypolepis; Isoetes; Lagarostrobus; Lepidothamnus; Leptospermum-type; Leucopogon fasciculatus; Lycopodium fastigiatum; Lycopodium scariosum; Lycopodium-type; Lycopodium varium; Melicytus; Metrosideros; Muehlenbeckia; Myriophyllum; Myrsine; Neomyrtus; Nestegis; Nothofagus; Nothofagus menziesii; Okarito_Pakihi; Ophioglossum; Peraxilla; Phyllocladus; Phymatosorus; Pinus; Plagianthus; Plantaginaceae; Poaceae; Podocarpus; Polypodiales; Prumnopitys ferruginea; Prumnopitys taxifolia; Pseudopanax; Pseudowintera; Pteris; Pteris tremula; Quintinia; Ranunculus; Rubus; Sample ID; Sampling by hand; Sphagnum; Typha; Weinmannia
    Materialart: Dataset
    Format: text/tab-separated-values, 15015 data points
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    DATA PANGAEA
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