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  • PANGAEA  (6)
  • 2010-2014  (6)
Publikationsart
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
Jahr
  • 1
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    Stable water isotopes in the coupled atmosphere-land surface model ECHAM5-JSBACH, supplementary data (2013)
    PANGAEA
    In:  EPIC3Bremerhaven, PANGAEA
    Details
    Publikationsdatum: 2019-07-17
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: PANGAEA Documentation , notRev
    Format: application/x-netcdf
    Format: application/x-netcdf
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    Format: application/x-netcdf
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 2
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    Hydrogen isotopic composition of sediment cores from a transect off western Africa (2013)
    PANGAEA
    In:  Supplement to: Collins, James A; Schefuß, Enno; Mulitza, Stefan; Prange, Matthias; Werner, Martin; Tharammal, Thejna; Paul, André; Wefer, Gerold (2013): Estimating the hydrogen isotopic composition of past precipitation using leaf-waxes from western Africa. Quaternary Science Reviews, 65, 88-101, https://doi.org/10.1016/j.quascirev.2013.01.007
    Details
    Publikationsdatum: 2023-03-03
    Beschreibung: The hydrogen isotopic composition of plant leaf-wax n-alkanes (dDwax) is a novel proxy for estimating dD of past precipitation (dDp). However, vegetation life-form and relative humidity exert secondary effects on dDwax, preventing quantitative estimates of past dDp. Here, we present an approach for removing the effect of vegetation-type and relative humidity from dDwax and thus for directly estimating past dDp. We test this approach on modern day (late Holocene; 0-3 ka) sediments from a transect of 9 marine cores spanning 21°N-23°S off the western coast of Africa. We estimate vegetation type (C3 tree versus C4 grass) using d13C of leaf-wax n-alkanes and correct dDwax for vegetation-type with previously-derived apparent fractionation factors for each vegetation type. Late Holocene vegetation-corrected dDwax (dDvc) displays a good fit with modern-day dDp, suggesting that the effects of vegetation type and relative humidity have both been removed and thus that dDvc is a good estimate of dDp. We find that the magnitude of the effect of C3 tree - C4 grass changes on dDwax is small compared to dDp changes. We go on to estimate dDvc for the mid-Holocene (6-8 ka), the Last Glacial Maximum (LGM; 19-23 ka) and Heinrich Stadial 1 (HS1; 16-18.5 ka). In terms of past hydrological changes, our leaf-wax based estimates of dDp mostly reflect changes in wet season intensity, which is complementary to estimates of wet season length based on leaf-wax d13C.
    Schlagwort(e): Center for Marine Environmental Sciences; MARUM
    Materialart: Dataset
    Format: application/zip, 2 datasets
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 3
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    (Table 3) Age model of sediment core MD08-3167 (2013)
    PANGAEA
    Details
    Publikationsdatum: 2023-03-03
    Schlagwort(e): Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated standard deviation; CALYPSO; Calypso Corer; Center for Marine Environmental Sciences; DEPTH, sediment/rock; MARUM; MD08-3167; off West Africa
    Materialart: Dataset
    Format: text/tab-separated-values, 24 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 4
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    Model results of orbital forcing and solar activity during the Holocene in NetCDF format (2013)
    PANGAEA
    In:  Supplement to: Dietrich, Stephan; Werner, Martin; Spangehl, T; Lohmann, Gerrit (2013): Influence of orbital forcing and solar activity on water isotopes in precipitation during the mid- and late Holocene. Climate of the Past, 9(1), 13-26, https://doi.org/10.5194/cp-9-13-2013
    Details
    Publikationsdatum: 2023-03-16
    Beschreibung: In this study we investigate the impact of mid- and late Holocene orbital forcing and solar activity on variations of the oxygen isotopic composition in precipitation. The investigation is motivated by a recently published speleothem d18O record from the well-monitored Bunker Cave in Germany. The record reveals some high variability on multi-centennial to millennial scales that does not linearly correspond to orbital forcing. Our model study is based on a set of novel climate simulations performed with the atmosphere general circulation model ECHAM5-wiso enhanced by explicit water isotope diagnostics. From the performed model experiments, we derive the following major results: (1) the response of both orbital and solar forcing lead to changes in surface temperatures and d18O in precipitation with similar magnitudes during the mid- and late Holocene. (2) Past d18O anomalies correspond to changing temperatures in the orbital driven simulations. This does not hold true if an additional solar forcing is added. (3) Two orbital driven mid-Holocene experiments, simulating the mean climate state approximately 5000 and 6000 yr ago, yield very similar results. However, if an identical additional solar activity-induced forcing is added, the simulated changes of surface temperatures as well as d18O between both periods differ. We conclude from our simulation results that non-linear effects and feedbacks of the orbital and solar activity forcing substantially alter the d18O in precipitation pattern and its relation to temperature change.
    Schlagwort(e): AWI_PaleoClimate; Paleo-climate Dynamics @ AWI
    Materialart: Dataset
    Format: application/zip, 3.1 MBytes
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 5
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    Results of the coupled atmosphere-land surface model ECHAM5-JSBACH in NetCDF format (2013)
    PANGAEA
    In:  Supplement to: Haese, Barbara; Werner, Martin; Lohmann, Gerrit (2013): Stable water isotopes in the coupled atmosphere–land surface model ECHAM5-JSBACH. Geoscientific Model Development, 6(5), 1463-1480, https://doi.org/10.5194/gmd-6-1463-2013
    Details
    Publikationsdatum: 2023-10-28
    Beschreibung: In this study we present first results of a new model development, ECHAM5-JSBACH-wiso, where we have incorporated the stable water isotopes H218O and HDO as tracers in the hydrological cycle of the coupled atmosphere-land surface model ECHAM5-JSBACH. The ECHAM5-JSBACH-wiso model was run under present-day climate conditions at two different resolutions (T31L19, T63L31). A comparison between ECHAM5-JSBACH-wiso and ECHAM5-wiso shows that the coupling has a strong impact on the simulated temperature and soil wetness. Caused by these changes of temperature and the hydrological cycle, the d18O in precipitation also shows variations from -4 permil up to 4 permil. One of the strongest anomalies is shown over northeast Asia where, due to an increase of temperature, the d18O in precipitation increases as well. In order to analyze the sensitivity of the fractionation processes over land, we compare a set of simulations with various implementations of these processes over the land surface. The simulations allow us to distinguish between no fractionation, fractionation included in the evaporation flux (from bare soil) and also fractionation included in both evaporation and transpiration (from water transport through plants) fluxes. While the isotopic composition of the soil water may change for d18O by up to +8 permil:, the simulated d18O in precipitation shows only slight differences on the order of ±1 permil. The simulated isotopic composition of precipitation fits well with the available observations from the GNIP (Global Network of Isotopes in Precipitation) database.
    Schlagwort(e): File name; File size; Integrierte Analyse zwischeneiszeitlicher Klimadynamik; INTERDYNAMIK; Uniform resource locator/link to model result file
    Materialart: Dataset
    Format: text/tab-separated-values, 33 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
  • 6
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    Leaf-wax stable hydrogen isotopic composition (dD) for a sediment core transect off western Africa for the LGM, HS1, mid-Holocene and late Holocene (2013)
    PANGAEA
    Details
    Publikationsdatum: 2024-02-02
    Schlagwort(e): 175-1078C; 293; 311; 320; Age, 14C calibrated; Age model; Angola Basin; Benguela Current, South Atlantic Ocean; CALYPSO; Calypso Corer; Carbon Preference Index, n-Alkanes; Center for Marine Environmental Sciences; Congo Fan; DEPTH, sediment/rock; DRILL; Drilling/drill rig; Event label; GeoB1023-5; GeoB4905-4; GeoB6518-1; GeoB7920-2; GeoB9508-5; GeoB9526-5; GeoB9535-4; Gravity corer (Kiel type); Joides Resolution; Leg175; M41/1; M47/3; M53/1; M6/6; M65/1; MARUM; MD08-3167; Meteor (1986); n-Alkane C31, δD; n-Alkane C31, δD, standard deviation; off Cameroon; off West Africa; SL; Thermo Trace GC - Thermo Fischer MAT 253 (GC/IR-MS); Timeslice
    Materialart: Dataset
    Format: text/tab-separated-values, 581 data points
    Standort Signatur Einschränkungen Verfügbarkeit
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    DATA PANGAEA
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