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  • 2015-2019  (43)
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  • 1
    Online Resource
    Online Resource
    Environment-Climate-Human interactions in Southern Morocco during the past 2000 years; inferences from high-resolution marine records : Schlussbericht nach Nr. 3.2 BNBest-BMBF 98 : ECHo 2016-2019 : ECHo PMARS III 2015/100 (2019)
    [Bremen] : [Universität Bremen]
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (21 Seiten, 8,86 MB) , Diagramme, Illustrationen
    URL: https://doi.org/10.2314/KXP:1767693389
    DOI: 10.2314/KXP:1767693389
    Language: German
    Note: Förderkennzeichen BMBF 01DH16030 , Verfasser dem Berichtsblatt entnommen , Laufzeit des Vorhabens: 01.12.2016 - 30.11.2019; Berichtszeitraum: 01.12.2016 - 30.11.2019 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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  • 2
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    The influence of basaltic islands on the oceanic REE distribution: A case study from the tropical South Pacific (2018)
    Frontiers
    In:  Frontiers in Marine Science, 5 . Art.No.50.
    Details
    Publication Date: 2021-03-19
    Description: The Rare Earth Elements (REEs) have been widely used to investigate marine biogeochemical processes as well as the sources and mixing of water masses. However, there are still important uncertainties about the global aqueous REE cycle with respect to the contributions of highly reactive basaltic minerals originating from volcanic islands and the role of Submarine Groundwater Discharge (SGD). Here we present dissolved REE concentrations obtained from waters at the island-ocean interface (including SGD, river, lagoon and coastal waters) from the island of Tahiti and from three detailed open ocean profiles on the Manihiki Plateau (including neodymium (Nd) isotope compositions), which are located in ocean currents downstream of Tahiti. Tahitian fresh waters have highly variable REE concentrations that likely result from variable water–rock interaction and removal by secondary minerals. In contrast to studies on other islands, the SGD samples do not exhibit elevated REE concentrations but have distinctive REE distributions and Y/Ho ratios. The basaltic Tahitian rocks impart a REE pattern to the waters characterized by a middle REE enrichment, with a peak at europium similar to groundwaters and coastal waters of other volcanic islands in the Pacific. However, the basaltic island REE characteristics (with the exception of elevated Y/Ho ratios) are lost during transport to the Manihiki Plateau within surface waters that also exhibit highly radiogenic Nd isotope signatures. Our new data demonstrate that REE concentrations are enriched in Tahitian coastal water, but without multidimensional sampling, basaltic island Nd flux estimates range over orders of magnitude from relatively small to globally significant. Antarctic Intermediate Water (AAIW) loses its characteristic Nd isotopic signature (-6 to-9) around the Manihiki Plateau as a consequence of mixing with South Equatorial Pacific Intermediate Water (SEqPIW), which shows more positive values (-1 to -2). However, an additional Nd input/exchange along the pathway of AAIW, eventually originating from the volcanic Society, Tuamotu and Tubuai Islands (including Tahiti), is indicated by an offset from the mixing array of AAIW and SEqPIW to more radiogenic Nd isotope compositions.
    Type: Article , PeerReviewed
    Format: text
    Format: image
    DOI: 10.3389/fmars.2018.00050
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Last interglacial temperature seasonality reconstructed from tropical Atlantic corals (2016)
    In:  EPIC3Earth and Planetary Science Letters, 449, pp. 418-429, ISSN: 0012821X
    Details
    Publication Date: 2016-07-22
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
    Format: application/pdf
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    PAPER (OA)
  • 4
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    Last interglacial hydroclimate seasonality reconstructed from tropical Atlantic corals (2018)
    AGU Publications
    In:  EPIC3Paleoceanography and Paleoclimatology, AGU Publications, ISSN: 2572-4525
    Details
    Publication Date: 2018-06-12
    Description: The seasonality of hydroclimate during past periods of warmer than modern global temperatures is a critical component for understanding future climate change scenarios. Although only partially analogous to these scenarios, the last interglacial (LIG, Marine Isotope Stage 5e, ~127–117 ka) is a popular test bed. We present coral δ18O monthly resolved records from multiple Bonaire (southern Caribbean) fossil corals (Diploria strigosa) that date to between 130 and 118 ka. These records represent up to 37 years and cover a total of 105 years, offering insights into the seasonality and characteristics of LIG tropical Atlantic hydroclimate. Our coral δ18O records and available coral Sr/Ca-sea surface temperature (SST) records reveal new insights into the variable relationship between the seasonality of tropical Atlantic seawater δ18O (δ18Oseawater) and SST. Coral δ18O seasonality is found to covary with SST and insolation seasonality throughout the LIG, culminating in significantly higher than modern values at 124 and 126 ka. At 124 ka, we reconstruct a 2 month lead of the coral δ18O versus the Sr/Ca-SST annual cycle and increased δ18Oseawater seasonality. A fully coupled climate model simulates a concomitant increase of southern Caribbean Sea summer precipitation and depletion of summer δ18Oseawater. LIG hydroclimate at Bonaire differed from today's semiarid climate with a minor rainy season during winter. Cumulatively, our coral δ18O, δ18Oseawater, and model findings indicate a mid-LIG northward expansion of the South American Intertropical Convergence Zone into the southern Caribbean Sea, highlighting the importance of regional aspects within model and proxy reconstructions of LIG hydroclimate seasonality.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 5
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    Mild and arid climate in the eastern Sahara‐Arabian Desert during the late Little Ice Age (2018)
    Wiley
    In:  EPIC3Geophysical Research Letters, Wiley, 45, ISSN: 0094-8276
    Details
    Publication Date: 2018-07-30
    Description: The climate of the Sahara and Arabian Deserts during the Little Ice Age is not well known, due to a lack of annually resolved natural and documentary archives. We present an annual reconstruction of temperature and aridity derived from Sr/Ca and oxygen isotopes in a coral of the desert‐surrounded northern Red Sea. Our data indicate that the eastern Sahara and Arabian Deserts did not experience pronounced cooling during the late Little Ice Age (~1750–1850) but suggest an even more arid mean climate than in the following ~150 years. The mild temperatures are broadly in line with predominantly negative phases of the North Atlantic Oscillation during the Little Ice Age. The more arid climate is best explained by meridional advection of dry continental air from Eurasia. We find evidence for an abrupt termination of the more arid climate after 1850, coincident with a reorganization of the atmospheric circulation over Europe.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 6
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    Ras Umm Sidd bimonthly δ¹⁸O and Sr/Ca data and annual d18O, Sr/Ca, reconstructed Sr/Ca temperature and reconstructed d18O seawater data of coral core/colony RUS-95 (2018)
    PANGAEA
    In:  Supplement to: Felis, Thomas; Ionita, Monica; Rimbu, Norel; Lohmann, Gerrit; Kölling, Martin (2018): Mild and Arid Climate in the Eastern Sahara-Arabian Desert During the Late Little Ice Age. Geophysical Research Letters, 45(14), 7112-7119, https://doi.org/10.1029/2018GL078617
    Details
    Publication Date: 2023-03-03
    Description: The climate of the Sahara and Arabian deserts during the Little Ice Age is not well known, due to a lack of annually resolved natural and documentary archives. We present an annual reconstruction of temperature and aridity derived from Sr/Ca and oxygen isotopes in a coral of the desert-surrounded northern Red Sea. Our data indicate that the eastern Sahara and Arabian Desert did not experience pronounced cooling during the late Little Ice Age (~1750-1850), but suggest an even more arid mean climate than in the following ~150 years. The mild temperatures are broadly in line with predominantly negative phases of the North Atlantic Oscillation during the Little Ice Age. The more arid climate is best explained by meridional advection of dry continental air from Eurasia. We find evidence for an abrupt termination of the more arid climate after 1850, coincident with a reorganization of the atmospheric circulation over Europe.
    Keywords: Center for Marine Environmental Sciences; MARUM
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 7
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    Ras Umm Sidd annual δ¹⁸O, Sr/Ca, reconstructed Sr/Ca temperature and reconstructed d18O seawater data of coral core/colony RUS-95 (2018)
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age; AGE; Center for Marine Environmental Sciences; DifferentSites; Drill, hydraulic; DRILLHY; MARUM; Porites sp., Strontium/Calcium ratio; Porites sp., δ18O; RUS-95; Sinai Peninsula, northern Red Sea; Temperature anomaly; δ18O, seawater, reconstructed
    Type: Dataset
    Format: text/tab-separated-values, 1220 data points
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    DATA PANGAEA
  • 8
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    Ras Umm Sidd bimonthly δ¹⁸O and Sr/Ca data of coral core/colony RUS-95 (2018)
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Age; AGE; Center for Marine Environmental Sciences; DifferentSites; Drill, hydraulic; DRILLHY; MARUM; Porites sp., Strontium/Calcium ratio; Porites sp., δ18O; RUS-95; Sinai Peninsula, northern Red Sea
    Type: Dataset
    Format: text/tab-separated-values, 4404 data points
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    DATA PANGAEA
  • 9
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    Provenance of nutrients in fresh water samples from Tahiti and Moorea, French Polynesia (2018)
    PANGAEA
    In:  Supplement to: Haßler, Kathrin; Dähnke, Kirstin; Kölling, Martin; Sichoix, Lydie; Nickl, Anna-Leah; Moosdorf, Nils (2019): Provenance of nutrients in submarine fresh groundwater discharge on Tahiti and Moorea, French Polynesia. Applied Geochemistry, 100, 181-189, https://doi.org/10.1016/j.apgeochem.2018.11.020
    Details
    Publication Date: 2024-03-08
    Description: Physico-chemical parameters, chloride, bromide and sulfate concentrations, nutrient concentrations, oxygen and hydrogen isotopic composition of water as well as oxygen and nitrogen isotopic composition of dissolved nitrate were measured in sea water, fresh submarine groundwater discharge (FSGD), groundwater and stream water samples collected during a field expedition on Tahiti and Moorea, French Polynesia in January and February 2016 .
    Keywords: Alkalinity, total; Ammonium; Ammonium, standard deviation; Bromine; Bromine, standard deviation; Chloride; Chloride, standard deviation; Conductivity, electrolytic; Event label; French_Polynesia-KH01; French_Polynesia-KH02; French_Polynesia-KH03; French_Polynesia-KH04; French_Polynesia-KH05; French_Polynesia-KH06; French_Polynesia-KH07; French_Polynesia-KH08; French_Polynesia-KH09; French_Polynesia-KH10; French_Polynesia-KH11; French_Polynesia-KH12; French_Polynesia-KH13; French_Polynesia-KH14; French_Polynesia-KH15; French_Polynesia-KH16; French_Polynesia-KH17; French_Polynesia-KH18; French_Polynesia-KH19; French_Polynesia-KH20; French_Polynesia-KH21; French_Polynesia-KH22; French_Polynesia-KH23; French_Polynesia-KH24; French_Polynesia-KH25; French_Polynesia-KH26; French_Polynesia-KH27; French_Polynesia-KH28; French_Polynesia-KH29; French_Polynesia-KH30; French_Polynesia-KH31; French_Polynesia-KH32; French_Polynesia-KH33; French_Polynesia-KH34; French_Polynesia-KH35; French_Polynesia-KH36; French_Polynesia-KH37; French_Polynesia-KH38; French_Polynesia-KH39; French_Polynesia-KH42; French_Polynesia-KH43; French_Polynesia-KH44; French_Polynesia-KH45; French_Polynesia-KH46; French_Polynesia-KH47; French_Polynesia-KH48; French_Polynesia-KH49; French_Polynesia-KH50; French_Polynesia-KH51; French_Polynesia-KH52; French_Polynesia-KH53; French_Polynesia-KH54; French_Polynesia-KH55; French_Polynesia-KH56; French_Polynesia-KH57; French_Polynesia-KH58; French_Polynesia-KH59; French_Polynesia-KH60; French_Polynesia-KH61; French_Polynesia-KH62; French_Polynesia-KH63; French_Polynesia-KH64; French_Polynesia-KH65; French_Polynesia-KH66; French_Polynesia-KH67; French_Polynesia-KH68; French_Polynesia-KH69; French_Polynesia-KH70; French_Polynesia-KH72; French_Polynesia-KH73; French_Polynesia-KH74; French_Polynesia-KH75; French_Polynesia-KH76; French_Polynesia-KH77; French_Polynesia-KH78; French_Polynesia-KH79; French_Polynesia-KH81; French_Polynesia-KH82; French_Polynesia-KH83; French_Polynesia-KH84; French_Polynesia-KH85; French_Polynesia-KH86; French_Polynesia-KH87; French_Polynesia-KH88; French Polynesia; Leibniz Centre for Tropical Marine Research; Nitrite; Nitrite, standard deviation; Nitrogen oxide; Nitrogen oxide, standard error; Oxygen; Oxygen saturation; pH; Phosphate; Phosphate, standard deviation; Sample ID; Sample type; Silicon; Silicon, standard deviation; Sulfate; Sulfate, standard deviation; Temperature, water; Water sample; WS; ZMT; δ15N; δ18O; δ18O, standard deviation; δ Deuterium; δ Deuterium, standard deviation
    Type: Dataset
    Format: text/tab-separated-values, 2403 data points
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    DATA PANGAEA
  • 10
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    (Table1) Location, description, hydrological properties and REE concentrations for Tahitian waters obtained at the land-ocean interphase (2018)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Keywords: Alkalinity, total; Category; Cerium, dissolved; Date/Time of event; DEPTH, water; Description; Dysprosium, dissolved; Erbium, dissolved; Europium, dissolved; Event label; Gadolinium, dissolved; HAND; Holmium, dissolved; Lanthanum, dissolved; Latitude of event; Longitude of event; Lutetium, dissolved; Neodymium, dissolved; Praseodymium, dissolved; Salinity; Samarium, dissolved; Sampling by hand; Silicate; Tahiti_t130; Tahiti_t139; Tahiti_t141; Tahiti_t142; Tahiti_t144; Tahiti_t145; Tahiti_t153; Tahiti_t154; Tahiti_t170; Tahiti_t171; Tahiti_t186; Tahiti_t187; Tahiti_t188; Tahiti_t189; Tahiti_t194; Tahiti_t195; Tahiti_t196; Tahiti_t197; Tahiti_t324; Tahiti_t350; Tahiti_t351; Tahiti_t352; Tahiti_t354; Tahiti_t355; Tahiti_t356; Tahiti_t357; Tahiti_t358; Terbium, dissolved; Thulium, dissolved; Ytterbium, dissolved; Yttrium, dissolved
    Type: Dataset
    Format: text/tab-separated-values, 521 data points
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    DATA PANGAEA
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