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  • 1
    Book
    Book
    Climate and seasonality in a Pilocene warm world (2011)
    Amsterdam [u.a.] : Elsevier
    Details Availability
    Type of Medium: Book
    Pages: S. 1 - 140 , Ill., graph. Darst., Kt.
    Series Statement: Palaeogeography, palaeoclimatology, palaeoecology 309.2011,1/2
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Are modern savannas degraded forests?-A Holocene pollen record from the Sudanian vagetation zone of NE Nigeria (2000)
    Springer
    Vegetation history and archaeobotany 9 (2000), S. 1-15 
    Details
    ISSN: 1617-6278
    Keywords: West Africa ; Vegetation history ; Climatic change ; Savanna ; Pollen analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Archaeology , Biology
    Notes: Abstract A pollen record from a crater lake (Lake Tilla, 10°23′N, 12°08′E, c. 700 m asl) in the Sudanian zone of northeast Nigeria provides evidence for the persistence of woodland savanna throughout the Holocene. Wetter conditions from c. 10,000 B.P. to c. 6800 B.P. enabled the establishment of a dense Guinean savanna, though the occurrence and rapid spread of the montane elementOlea hochstetteri indicates cool climatic conditions prior to c. 8800 B.P. Patches of closed dry forest may have existed, but never completely displaced the savanna vegetation. Grass fires were frequent throughout the Holocene and were probably important in promoting the open character of the vegetation. From c. 6800 B.P. onwards a gradual floristic change from a Guinean to a Sudano-Guinean savanna and a lowering of lake levels point to drier environmental conditions, which intensified around 3700 B.P. Human impact might have caused increasing sedimentation rates from c. 2500 B.P. onwards. The pollen diagram of Lake Tilla reflects a history of the savanna which appears to have been primarily controlled by climatic changes. The lack of unambiguous pollen indicators might be the reason why human activities remain palynologically hidden even for the late Holocene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01295010
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    Paper (German National Licenses)
    Fulltext
  • 3
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    The DeepMIP contribution to PMIP4: experimental design for model simulations of the EECO, PETM, and pre-PETM (version 1.0) (2017)
    Copernicus Publications (EGU)
    In:  Geoscientific Model Development, 10 (2). pp. 889-901.
    Details
    Publication Date: 2020-02-06
    Description: Past warm periods provide an opportunity to evaluate climate models under extreme forcing scenarios, in particular high ( 〉  800 ppmv) atmospheric CO2 concentrations. Although a post hoc intercomparison of Eocene ( ∼  50  Ma) climate model simulations and geological data has been carried out previously, models of past high-CO2 periods have never been evaluated in a consistent framework. Here, we present an experimental design for climate model simulations of three warm periods within the early Eocene and the latest Paleocene (the EECO, PETM, and pre-PETM). Together with the CMIP6 pre-industrial control and abrupt 4 ×  CO2 simulations, and additional sensitivity studies, these form the first phase of DeepMIP – the Deep-time Model Intercomparison Project, itself a group within the wider Paleoclimate Modelling Intercomparison Project (PMIP). The experimental design specifies and provides guidance on boundary conditions associated with palaeogeography, greenhouse gases, astronomical configuration, solar constant, land surface processes, and aerosols. Initial conditions, simulation length, and output variables are also specified. Finally, we explain how the geological data sets, which will be used to evaluate the simulations, will be developed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.5194/gmd-10-889-2017
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    The DeepMIP contribution to PMIP4: methodologies for selection, compilation and analysis of latest Paleocene and early Eocene climate proxy data, incorporating version 0.1 of the DeepMIP database (2019)
    Copernicus Publications (EGU)
    In:  Geoscientific Model Development, 12 (7). pp. 3149-3206.
    Details
    Publication Date: 2022-01-31
    Description: The early Eocene (56 to 48 million years ago) is inferred to have been the most recent time that Earth's atmospheric CO2 concentrations exceeded 1000 ppm. Global mean temperatures were also substantially warmer than present day. As such, study of early Eocene climate provides insight into how a super-warm Earth system behaves and offers an opportunity to 10 evaluate climate models under conditions of high greenhouse gas forcing. The Deep Time Model Intercomparison Project (DeepMIP) is a systematic model-model and model-data intercomparison of three early Paleogene time slices: latest Paleocene, Paleocene-Eocene thermal maximum and early Eocene climatic optimum. A previous article outlined the model experimental design for climate model simulations. In this article, we outline the methodologies to be used for the compilation and analysis of climate proxy data, primarily proxies for temperature and CO2. This paper establishes the protocols for a concerted and 15 coordinated effort to compile the climate proxy records across a wide geographic range. The resulting climate "atlas" will be used to constrain and evaluate climate models for the three selected time intervals, and provide insights into the mechanisms that control these warm climate states. We provide version 0.1 of this database, in anticipation that this will be expanded in subsequent publications.
    Type: Article , PeerReviewed
    Format: text
    Format: archive
    DOI: 10.5194/gmd-12-3149-2019
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Sporomorph counts, diversity, DCA and climate estimate calculations from ODP Hole 113-696B (2021)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Description: A total of 35 samples from the late-middle Eocene to earliest Oligocene (643.73-520.88 mbsf) were analysed for their pollen and spore content. Slides were analysed using a Leica DM500 and Leica DM2000 transmitted light microscopes at 200x and 1000x magnification. Where possible, counts of 300 (excluding reworked grains) sporomorphs were made. Only samples containing 50 or more in situ sporomorphs were used for further analysis and evaluation. Sporomorph diversity was measured using both the Shannon–Wiener index and the observed number of taxa. A rarefaction method for sums of ≥50 and ≥100 grains was applied, so that the effect caused by differences in the sample size may be removed allowing the estimation of the number of sporomorph species at a constant sample size. Detrended Correspondence Analysis (DCA) was performed, with downweighting of rare species by removing pollen types whose representation is 〈5%. Estimates for terrestrial mean annual temperature (MAT), mean annual precipitation (MAP), warmest month mean temperature (WMMT) and coldest month mean temperature (CMMT) were obtained using the NLR approach in conjunction with the Probability Density Function (PDF) method.
    Keywords: Antarctica; Drake Passage; Eocene-Oligocene Transition; palynology
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 6
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    (Figure 3) Dust flux determined from peat core MOHOS in the Eastern Carpathians, Romania (2017)
    PANGAEA
    Details
    Publication Date: 2023-02-07
    Keywords: Calendar age; COMPCORE; Composite Core; Core; DEPTH, sediment/rock; Dust, flux; MOHOS; Mohos, Romania; see reference(s)
    Type: Dataset
    Format: text/tab-separated-values, 312 data points
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    DATA PANGAEA
  • 7
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    Age determination and dust flux of peat core MOHOS (2017)
    PANGAEA
    In:  Supplement to: Longman, Jack; Veres, Daniel; Ersek, Vasile; Salzmann, Ulrich; Hubay, Katalin; Borman, Marc; Wennrich, Volker; Schäbitz, Frank (2017): Periodic input of dust over the Eastern Carpathians during the Holocene linked with Saharan desertification and human impact. Climate of the Past, 13(7), 897-917, https://doi.org/10.5194/cp-13-897-2017
    Details
    Publication Date: 2023-02-23
    Description: Reconstructions of dust flux have been used to produce valuable global records of changes in atmospheric circulation and aridity. These studies have highlighted the importance of atmospheric dust in marine and terrestrial biogeochemistry and nutrient cycling. By investigating a 10800-year-long paleoclimate archive from the Eastern Carpathians (Romania) we present the first peat record of changing dust deposition over the Holocene for the Carpathian-Balkan region. Using qualitative (X-ray fluorescence (XRF) core scanning) and quantitative inductively coupled plasma optical emission spectrometer(ICP-OES) measurements of lithogenic (K, Si, Ti) elements, we identify 10 periods of major dust deposition between 9500-9200, 8400-8100, 7720-7250, 6350-5950, 5450-5050, 4130-3770, 3450-2850, 2000-1450, 800-620, and 60 cal yr BP to present. In addition, we used testate amoeba assemblages preserved within the peat to infer local palaeohydroclimatic conditions. Our record highlights several discrepancies between eastern and western European dust depositional records and the impact of highly complex hydrological regimes in the Carpathian region. Since 6100 cal yr BP, we find that the geochemical indicators of dust flux have become uncoupled from the local hydrology. This coincides with the appearance of millennial-scale cycles in the dust input and changes in geochemical composition of dust. We suggest that this is indicative of a shift in dust provenance from local-regional (likely loess-related) to distal (Saharan) sources, which coincide with the end of the African Humid Period and the onset of Saharan desertification.
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 8
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    (Table 1) Age determination of peat core MOHOS in the Eastern Carpathians, Romania (2017)
    PANGAEA
    Details
    Publication Date: 2023-02-23
    Keywords: Age, 14C AMS; Age, 14C calibrated, IntCal13 (Reimer et al., 2013); Age, dated; Age, dated material; Age, dated standard deviation; Calendar age, maximum/old; Calendar age, minimum/young; COMPCORE; Composite Core; DEPTH, sediment/rock; MOHOS; Mohos, Romania; Sample, optional label/labor no
    Type: Dataset
    Format: text/tab-separated-values, 96 data points
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  • 9
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    Raw pollen and sporen counts from ODP Hole 113-696B (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 113-696B; Acaena spp.; AGE; Alisporites cf. Australis; Antarctica; Araucariacites australis; Arecipites spp.; Baculatisporites comaumensis; Beaupreaidites cf. verrucosus; Beaupreaidites diversiformis; Camarozonosporites sp.; Ceratosporites cf. equalis; Chenopodipollis chenopodiaceoides; Clavatipollenites ascarinoides; Coptospora archangelskyi; Counting, light microscope; Cupanieidites orthoteichus; Cyathidites australis; Cyathidites minor; Cyathidites splendens; Cyathidites subtilis; Dacrydiumites florinii; DEPTH, sediment/rock; Dictyophyllidites arcuatus; Dilwynites granulatus; Drake Passage; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eocene-Oligocene Transition; Ericipites cf. scabratus; Foveotriletes lacunosus; Gleicheniidites spp.; Integricorpus sp.; Ischyosporites gremius; Joides Resolution; Laevigatosporites major; Laevigatosporites ovatus; Lateropora glabra; Leg113; Ligulifloridites sp.; Liliacidites intermedius; Lymingtonia cf. cenozoica; Malvacipollis cf. subtilis; Microalatidites paleogenicus; Microcachryidites antarcticus; Monolites alveolatus; Myricipites harrisii; Myrtaceidites cf. mesonesus; Nothofagidites asperus complex; Nothofagidites brachyspinulosus complex; Nothofagidites emarcidus complex; Nothofagidites flemingii; Nothofagidites lachlaniae complex; Nothofagidites rocaensis complex; Nothofagidites spp.; Osmundacidites cf. wellmanii; palynology; Parsonsidites psilatus; Peninsulapollis gillii; Periporopollenites polyoratus; Peromonolites cf. densus; Phyllocladidites cf. mawsonii; Phyllocladidites mawsonii; Podocarpidites cf. exiguus; Podocarpidites marwickii complex; Podocarpidites rugulatus complex; Podocarpidites spp.; Podosporites cf. brevisaccatus; Podosporites cf. ohikaensis; Podosporites parvus; Pollen and spores; Polycolporopollenites; Polypodiisporites cf. radiatus; Proteacidites adenanthoides; Proteacidites cf. amolosexinus; Proteacidites cf. Lewalanipollis trycheros; Proteacidites cf. Scabratriporites spp.; Proteacidites minimus; Proteacidites obscurus; Proteacidites parvus; Proteacidites reticuloscabratus; Proteacidites scaboratus; Proteacidites sp.; Proteacidites spiniferus; Proteacidites tenuiexinus; Proteacidites tuberculatus; Retitriletes spp.; Rugulatisporites spp.; Sample code/label; Scabramonoletes; Sparganiaceaepollenites barungensis; Stereisporites antiquasporites; Stereisporites regium; Trichotomosulcites subgranulatus; Tricolpites cf. asperamarginis; Tricolpites cf. brevicolpus; Tricolpites cf. delicatulus; Tricolpites fissilis; Tricolpites inargutus; Tricolpites lilliei; Tricolpites reticulatus; Tricolpites sp.; Tricolpites spp.; Tricolporites cf. scabratus; Tricolporites sp.; Triorites sp.; Tripunctisporis maastrichtiensis; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 3535 data points
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    DATA PANGAEA
  • 10
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    Reworked pollen and sporen counts from ODP Hole 113-696B (2021)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: 113-696B; AGE; Antarctica; Biretisporites cf. labruplenus; Brevitriletes bulliensis; Brevitriletes sp.; Calamospora spp.; Cibotiumspora cf. intrastriatus; Cicatricosisporites sp.; Classopollis spp.; Clavatipollenites hughesii; Coptospora striata; Counting, light microscope; Cyatheacidites annulatus; DEPTH, sediment/rock; Dictyophyllidites cf. harrisii; Drake Passage; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Eocene-Oligocene Transition; Granulatisporites trisinus; Joides Resolution; Leg113; Leptolepidites verrucatus; Lycopodiacidites cf. bullerensis; Lycopodiacidites cristatus; Lycopodiumsporites pseudoreticulatus; palynology; Pollen, bisaccate undifferentiated; Pollen and spores; Protohaploxypinus cf. samoilovichii; Protohaploxypinus spp.; Retitriletes cf. eminulus; Retitriletes cf. reticulumsporites; Rugulatisporites cf. trisinus; Sample code/label; Spores, trilete undifferentiated; Tricolpites cf. pachyexinus; Trilites verrucatus; Weddell Sea
    Type: Dataset
    Format: text/tab-separated-values, 945 data points
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    DATA PANGAEA
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