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  • 1
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    Elevated dust depositions in West Asia linked to ocean–atmosphere shifts during North Atlantic cold events (2020)
    National Academy of Sciences
    Details
    Publication Date: 2020-07-20
    Description: Rapid North Atlantic cooling events during the last deglaciation caused atmospheric reorganizations on global and regional scales. Their impact on Asian climate has been investigated for monsoonal domains, but remains largely unknown in westerly wind-dominated semiarid regions. Here we generate a dust record from southeastern Iran spanning the period 19 to 7 cal. ka B.P. We find a direct link between frequent occurrences of dust plumes originating from the Arabian Peninsula and North Africa and rapid southward shifts of the westerlies associated with changes of the winter stationary waves during Heinrich Stadial 1, the Younger Dryas, the Preboreal Oscillation, and the 8.2-ka event. Dust input rises and falls abruptly at the transitions into and out of these cooling events, which we attribute to changes in the ocean circulation strength that are modulated by the North Atlantic winter sea-ice cover. Our findings reveal that waxing and waning of North American ice sheets have a stronger influence than those of European ice sheets on the winter climate over West Asia.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 2
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    Total organic carbon of core Konar Sandal peat bog, SE Iran (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-23
    Keywords: AGE; Atmospheric dust; Carbon, organic, total; CDRILL; Core drilling; DEPTH, sediment/rock; KSB; North Atlantic cooling; Northern Hemisphere Westerlies; sea-ice; Southeastern Iran; West Asia
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
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  • 3
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    X-ray fluorescence (XRF) measurements of core Konar Sandal peat bog, SE Iran (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-23
    Keywords: AGE; Aluminium; Atmospheric dust; CDRILL; Core drilling; DEPTH, sediment/rock; Iron; KSB; North Atlantic cooling; Northern Hemisphere Westerlies; Potassium; sea-ice; Silicon; Southeastern Iran; Titanium; West Asia; X-ray fluorescence core scanner (XRF); Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 3414 data points
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    DATA PANGAEA
  • 4
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    Grain size of core Konar Sandal peat bog, SE Iran (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-23
    Keywords: AGE; Atmospheric dust; CDRILL; Core drilling; DEPTH, sediment/rock; Gravel; KSB; Median, grain size; North Atlantic cooling; Northern Hemisphere Westerlies; Sand; sea-ice; Size fraction 〈 0.002 mm, clay; Size fraction 0.004-0.002 mm, 8.0-9.0 phi, very fine silt; Size fraction 0.008-0.004 mm, 7.0-8.0 phi, fine silt; Size fraction 0.016-0.008 mm, 6.0-7.0 phi, medium silt; Size fraction 0.032-0.016 mm, 5.0-6.0 phi, coarse silt; Size fraction 0.063-0.002 mm, silt, mud; Size fraction 0.063-0.032 mm, 4.0-5.0 phi, very coarse silt; Size fraction 0.125-0.063 mm, 3.0-4.0 phi, very fine sand; Size fraction 0.250-0.125 mm, 2.0-3.0 phi, fine sand; Size fraction 0.500-0.250 mm, 1.0-2.0 phi, medium sand; Size fraction 1.000-0.500 mm, 0.0-1.0 phi, coarse sand; Size fraction 16-8 mm, medium gravel; Size fraction 2.000-1.000 mm, (-1.0)-0.0 phi, very coarse sand; Size fraction 32-16 mm, coarse gravel, pebble; Size fraction 4.0-2.0 mm, very fine gravel, granule; Size fraction 64-32 mm, very coarse gravel, pebble; Size fraction 8.0-4.0 mm, fine gravel; Southeastern Iran; West Asia
    Type: Dataset
    Format: text/tab-separated-values, 600 data points
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  • 5
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    XRD analyses of core Konar Sandal peat bog, SE Iran (2020)
    PANGAEA
    Details
    Publication Date: 2024-02-23
    Keywords: AGE; Albite; Anorthoclase; Atmospheric dust; CDRILL; Chlorite; Clinochlore; Core drilling; DEPTH, sediment/rock; Diopside; Gypsum; Kaolinite; KSB; Minerals, other; Muscovite; North Atlantic cooling; Northern Hemisphere Westerlies; Palygorskite; Quartz; sea-ice; Southeastern Iran; West Asia; X-ray diffraction (XRD)
    Type: Dataset
    Format: text/tab-separated-values, 132 data points
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  • 6
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    Loss-on-ignition in Hashilan Wetland sediment core, western Iran (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-23
    Description: The proxy data reported here are measured from a sediment core collected from the Hashilan Wetland in the Zagros Mountains of western Iran. For Loss-on-Ignition (LOI), samples with 1 cm3 volume were dried overnight at 105 °C and weighed. The dry samples were combusted at 550 °C for 4 hrs and at 950 °C for 2 hrs to determine OM and CaCO3 contents of the samples, respectively. The percentage of non-carbonate mineral matter (NCMM: LOI residue) was calculated using the following formula: 100 – LOI (in %). The analyses were carried out at the Faculty of Geography, University of Tehran.
    Keywords: AGE; Atmospheric dust; Calculated; Combustion at 950°C; DEPTH, sediment/rock; Hashilan wetland; HashW_core; Holocene climate; HW; Ignition loss at 500°C; Ignition residue; loss on ignition; Loss on ignition; PEATC; Peat corer
    Type: Dataset
    Format: text/tab-separated-values, 255 data points
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  • 7
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    X-Ray fluorescence analysis of Hashilan Wetland sediment core, western Iran (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-23
    Description: The proxy data reported here are measured from a sediment core collected from the Hashilan Wetland in the Zagros Mountains of western Iran. For X-Ray Fluorescence (XRF) core scanning, samples were dried, ground and measured individually with an ITRAX XRF core-scanner (Cox Analytics) (Croudace et al., 2006; Croudace et al., 2019) following the approach of Profe and Ohlendorf (2019) for measuring discrete samples. Analyses were carried out with the Molybdenum (Mo) X-ray tube with a voltage of 30 kV, a current of 40 mA, and 100 s exposure time. Analyses were carried out in the GEOPOLAR lab at the University of Bremen.
    Keywords: AGE; Atmospheric dust; Calcium; Chromium; DEPTH, sediment/rock; Hashilan wetland; HashW_core; Holocene climate; HW; Iron; Manganese; Nickel; PEATC; Peat corer; Rubidium; Strontium; Titanium; X-ray fluorescence ITRAX core scanner; XRF; Zinc; Zirconium
    Type: Dataset
    Format: text/tab-separated-values, 760 data points
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    DATA PANGAEA
  • 8
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    Mineralogical analysis by X-Ray diffraction of Hashilan Wetland sediment core, western Iran (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-23
    Description: For mineralogical analysis by X-Ray Diffraction (XRD), samples of ~ 1 gram were dried at 50 °C for 48 hours. The dried samples were ground and homogenized using mortar and pestle. XRD analyses were carried out at the Crystallography and Geomaterials Group, Dept. of Geosciences, University of Bremen. The X-ray diffractograms have been measured on a Philips X'Pert Pro multipurpose diffractometer equipped with a Cu-tube (kα 1.541, 45 kV, 40 mA), a fixed divergence slit of ¼°, a 16 samples changer, a secondary Ni-Filter, and the X'Celerator detector system. Measurements were performed as a continuous scan from 3–65° 2θ, with a calculated step size of 0.016° 2θ (calculated time per step was 100 s). Minerals were identified with the Philips/Panalytical software X'Pert HighScore™, which can also give a semi-quantitative value for each identified mineral on the basis of Relative Intensity Ratio (R.I.R)-values. The R.I.R.-values are calculated as the ratio between the intensity of the most intense reflex of a specific mineral phase and the intensity of the most intense reflex of pure corundum (I/Ic) referring to as the "matrix-flushing method" after Chung (1974).
    Keywords: AGE; Albite; Amesite; Atmospheric dust; Calcite; Clinochlore; DEPTH, sediment/rock; Gypsum; Hashilan wetland; HashW_core; Holocene climate; HW; Labradorite; Minerals, other; Montmorillonite; Palygorskite; PEATC; Peat corer; Quartz; Smectite; X-ray diffraction (Philips X'Pert Pro); XRD
    Type: Dataset
    Format: text/tab-separated-values, 176 data points
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  • 9
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    Magnetic susceptibility in core Hashilan Wetland, western Iran (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-23
    Description: For Magnetic susceptibility (MS), the MS of the core was measured using a Bartington MS2C sensor at the Marine Geology Division of the Iranian National Institute for Oceanography and Atmospheric Science (INIOAS). The down-core scanning was carried out in 1-cm increments.
    Keywords: AGE; Bartington MS2C Core Logging Sensor; DEPTH, sediment/rock; Hashilan wetland; HashW_core; Holocene climate; HW; Magnetic susceptibility; PEATC; Peat corer; Pollen; Vegetation dynamics
    Type: Dataset
    Format: text/tab-separated-values, 306 data points
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  • 10
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    Pollen counts in Hashilan Wetland sediment core, western Iran (2023)
    PANGAEA
    Details
    Publication Date: 2024-02-23
    Description: For pollen analysis, standard analytical techniques (Faegri and Iversen, 1989) were applied for pollen extraction. Samples were treated with 10% KOH, 10% HCl, 37% HF and acetolysis. The pollen grains were extracted from the size fraction between 160 and 10 µm sieves and were mounted in silicone oil (2000 cs). Pollen extraction was carried out at the Faculty of Geography, University of Tehran and Faculty of Geoscience, University of Bremen. The pollen data reported here are count data.
    Keywords: Acantholimon; Acer; Achillea; AGE; Alisma-type; Alnus; Amaranthaceae; Ambrosia; Amygdalus-type; Anisosciadium-type; Anthemis; Apiaceae; Artemisia; Asteraceae; Asteroideae; Astragalus-type; Atmospheric dust; Brassicaceae; Bunium-type; Calligonum; Carduus-type; Carthamus-type; Caryophyllaceae; Caryophyllaceae stellaria; Centaurea; Centaurea cyanus-type; Centaurea solstitialis-type; Cichorioideae; Cirsium/Gundelia; Convolvulus; Counting, palynology; Cousinia; Cyperaceae; Daphne; DEPTH, sediment/rock; Dipsacaceae; Dodonea; Echinops; Ephedra distachya-type; Ephedra fragilis-type; Epilobium; Ericaceae; Eryngium-type; Euphorbia; Fabaceae; Ferula-type; Fraxinus; Galium-type; Grain Size; Hashilan wetland; HashW_core; Helianthus; Holocene climate; HW; Juglans; Juniperus; Lamiaceae; Liliaceae; Lonicera; loss on ignition; Lythrum; magnetic susceptibility; Malva; Matthiola; Myriophyllum; Noaea-type; Olea; PEATC; Peat corer; Pimpinella-type; Pinus; Pistacia; Plantaginaceae; Plantago coronopus-type; Plantago lanceolata; Plumbaginaceae; Poaceae; Pollen; Pollen indeterminata; Polygonum aviculare; Polygonum glabrum; Polygonum plebeium; Polypodiaceae; Quercus; Ranunculaceae; Rheum; Rosaceae; Rumex cyprius-type; Sagittaria; Salix; Sanguisorba minor-type; Scabiosa-type; Senecio/Filago-type; Silene; Sisyrinchium; Sium-type; Thalictrum; Turgenia-type; Typha/Sparganium-type; Typha latifolia; Ulmus/Zelkova; Urtica-type; Vegetation dynamics; Vitis; XRD; XRF
    Type: Dataset
    Format: text/tab-separated-values, 818 data points
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