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  • 1
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    Isotopic data of atmospheric methane from EDML and Vostok ice cores over a full glacial cycle (2013)
    PANGAEA
    In:  Supplement to: Möller, Lars; Sowers, Todd A; Bock, Michael; Spahni, Renato; Behrens, Melanie; Schmitt, Jochen; Miller, Heinz; Fischer, Hubertus (2013): Independent variations of CH4 emissions and isotopic composition over the past 160,000 years. Nature Geoscience, 6, 885-890, https://doi.org/10.1038/ngeo1922
    Details
    Publication Date: 2023-03-16
    Description: The response of natural CH4 sources to climate changes will be an important factor to consider as concentrations of this potent greenhouse gas continue to increase. Polar ice cores provide the means to assess this sensitivity in the past and have shown a close connection between CH4 levels and northern hemisphere temperature variability over the last glacial cycle. However, the contribution of the various CH4 sources and sinks to these changes is still a matter of debate. Contemporaneous stable CH4 isotope records in ice cores provide additional boundary conditions for assessing changes in the CH4 sources and sinks. Here we present new ice core CH4 isotope data covering the last 160,000 years, showing a clear decoupling between CH4 loading and carbon isotopic variations over most of the record. We suggest that d13CH4 variations were not dominated by a change in the source mix but rather by climate- and CO2-related ecosystem control on the isotopic composition of the methane precursor material, especially in seasonally inundated wetlands in the tropics. In contrast, relatively stable d13CH4 intervals occurred during large CH4 loading changes concurrently with past climate changes implying that most CH4 sources (most notably tropical wetlands) responded simultaneously.
    Keywords: EPICA; European Project for Ice Coring in Antarctica
    Type: Dataset
    Format: application/zip, 5 datasets
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  • 2
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    Age model and stable oxygen isotope mean values of ice core SZ99 from Akademii Nauk ice cap on Severnaya Zemlya (2006)
    PANGAEA
    In:  Supplement to: Fritzsche, Diedrich; Schütt, Rainer; Meyer, Hanno; Miller, Heinz; Wilhelms, Frank; Opel, Thomas; Savatyugin, Lev M (2005): A 275 year ice core record from Akademii Nauk ice cap, Severnaya Zemlya, Russian Arctic. Annals of Glaciology, 42, 361-366, https://doi.org/10.3189/172756405781812862
    Details
    Publication Date: 2023-03-07
    Description: Between 1999 and 2001, a 724 m long ice core was drilled on Akademii Nauk, the largest glacier on Severnaya Zemlya, Russian Arctic. The drilling site is located near the summit. The core is characterized by high melt-layer content. The melt layers are caused by melting and even by rain during the summer. We present high-resolution data of density, electrical conductivity (dielectrical profiling), stable water isotopes and melt-layer content for the upper 136 m (120 m w.e.) of the ice core. The dating by isotopic cycles and electrical conductivity peak identification suggests that this core section covers approximately the past 275 years. Singularities of volcanogenic and anthropogenic origin provide well-defined additional time markers. Long-term temperatures inferred from 12 year running mean averages of d18O reach their lowest level in the entire record around 1790. Thereafter the d18O values indicate a continuously increasing mean temperature on the Akademii Nauk ice cap until 1935, interrupted only by minor cooling episodes. The 20th century is found to be the warmest period in this record.
    Keywords: Age; AGE; Age model, layer counting; Akademii Nauk, Severnaya Zemlya, Russian Arctic; AWI_PerDyn; AWI Arctic Land Expedition; Calculated average/mean values; Calculated from density; Calculated moving averages; DEPTH, ice/snow; Depth water equivalent; ICEDRILL; Ice drill; Permafrost Research (Periglacial Dynamics) @ AWI; RU-Land_1999/2001_SevernayaZemly; SZ_1999/2001; SZ99; δ18O; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 676 data points
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  • 3
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    Elevation Models of Antarctica and Greenland derived from CryoSat-2 in the period 2011 to 2013 (2014)
    PANGAEA
    In:  Supplement to: Helm, Veit; Humbert, Angelika; Miller, Heinz (2014): Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2. The Cryosphere, 8(4), 1539-1559, https://doi.org/10.5194/tc-8-1539-2014
    Details
    Publication Date: 2023-01-13
    Description: This study focuses on the present-day surface elevation of the Greenland and Antarctic ice sheets. Based on 3 years of CryoSat-2 data acquisition we derived new elevation models (DEMs) as well as elevation change maps and volume change estimates for both ice sheets. Here we present the new DEMs and their corresponding error maps. The accuracy of the derived DEMs for Greenland and Antarctica is similar to those of previous DEMs obtained by satellite-based laser and radar altimeters. Comparisons with ICESat data show that 80% of the CryoSat-2 DEMs have an uncertainty of less than 3 m ± 15 m. The surface elevation change rates between January 2011 and January 2014 are presented for both ice sheets. We compared our results to elevation change rates obtained from ICESat data covering the time period from 2003 to 2009. The comparison reveals that in West Antarctica the volume loss has increased by a factor of 3. It also shows an anomalous thickening in Dronning Maud Land, East Antarctica which represents a known large-scale accumulation event. This anomaly partly compensates for the observed increased volume loss of the Antarctic Peninsula and West Antarctica. For Greenland we find a volume loss increased by a factor of 2.5 compared to the ICESat period with large negative elevation changes concentrated at the west and southeast coasts. The combined volume change of Greenland and Antarctica for the observation period is estimated to be -503 ± 107 km**3/yr. Greenland contributes nearly 75% to the total volume change with -375 ± 24 km**3/yr.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    Elevation Model of Antarctica derived from CryoSat-2 in the period 2011 to 2013, links to DEM and uncertainty map as GeoTIFF (2014)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Comment; pan-Antarctica; Uniform resource locator/link to raw data file
    Type: Dataset
    Format: text/tab-separated-values, 4 data points
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  • 5
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    Elevation Model of Greenland derived from CryoSat-2 in the period 2011 to 2013, links to DEM and uncertainty map as GeoTIFF (2014)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Comment; Greenland; Uniform resource locator/link to raw data file
    Type: Dataset
    Format: text/tab-separated-values, 4 data points
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  • 6
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    Conductivity and oxygen isotope measured on ice core FRI09C90_13 (B13) from the Filchner-Ronne ice shelf, Antarctica
    PANGAEA
    In:  Supplement to: Oerter, Hans; Kipfstuhl, Sepp; Determann, Jürgen; Miller, Heinz; Wagenbach, Dietmar; Minikin, Andreas; Graf, Wolfgang (1992): Evidence for basal marine ice in the Filchner-Ronne ice shelf. Nature, 358, 399-401, https://doi.org/10.1038/358399a0
    Details
    Publication Date: 2023-06-27
    Description: The Filchner-Ronne ice shelf, which drains most of the marine-based portions of the West Antarctic ice sheet, is the largest ice shelf on Earth by volume. The origin and properties of the ice that constitutes this shelf are poorly understood, because a strong reflecting interface within the ice and the diffuse nature of the ice?ocean interface make seismic and radio echo sounding data difficult to interpret. Ice in the upper part of the shelf is of meteoric origin, but it has been proposed that a basal layer of saline ice accumulates from below. Here we present the results of an analysis of the physical and chemical characteristics of an ice core drilled almost to the bottom of the Ronne ice shelf. We observe a change in ice properties at about 150 m depth, which we ascribe to a change from meteoric ice to basal marine ice. The basal ice is very different from sea ice formed at the ocean surface and we propose a formation mechanism in which ice platelets in the water column accrete to the bottom of the ice shelf.
    Keywords: AWI_Glac; B13 BC90; Conductivity, electrolytic; Depth, bottom/max; DEPTH, ice/snow; Depth, top/min; Electrical conductivity method, ECM (Hammer, 1980); Filchner Ronne Ice Shelf; Filchner-Ronne-Ice-Shelf-Project; FRI09C90_13; FRISP 1992; Glaciology @ AWI; ICEDRILL; Ice drill; Mass spectrometer Finnigan Delta-S; Sampling/drilling ice; δ18O, water
    Type: Dataset
    Format: text/tab-separated-values, 1331 data points
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  • 7
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    Physical properties of firn core DML27C00_04 (2002)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Calculated from density; Conductivity, specific; Conductivity, specific, error; Density, mass density; Density, standard deviation; Density-and-conductivity mixed permittivity (DECOMP); DEPTH, ice/snow; Depth water equivalent; Depth water equivalent, error; Dielectric profiling, DEP (Wilhelms, 2000); DML27C00_04; Dronning Maud Land, Antarctica; EPICA; EPICA_DML5; European Project for Ice Coring in Antarctica; FB9904; FIRN; Firn auger; Gamma-ray attenuation density (Wilhelms, 1996); Kohnen Station; Permittivity, relative; Permittivity, relative, error
    Type: Dataset
    Format: text/tab-separated-values, 17640 data points
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  • 8
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    Age model of firn core DML17C98_33 (B33)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age; Age model; Age model, layer counting; B33; Depth, bottom/max; DEPTH, ice/snow; Depth, top/min; DML17C98_33; Dronning Maud Land, Antarctica; EPICA; EPICA_DML3; European Project for Ice Coring in Antarctica; ICEDRILL; Ice drill; Neumayer Station (WMO89002); see comment
    Type: Dataset
    Format: text/tab-separated-values, 8487 data points
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  • 9
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    Physical properties of firn core DML09C97_00
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Calculated from density; Conductivity, specific; Conductivity, specific, error; Density, mass density; Density, standard deviation; Density-and-conductivity mixed permittivity (DECOMP); DEPTH, ice/snow; Depth water equivalent; Depth water equivalent, error; Dielectric profiling, DEP (Wilhelms, 2000); DML09C97_00; Dronning Maud Land, Antarctica; EPICA; EPICA_DML2; European Project for Ice Coring in Antarctica; FB97DML09; FIRN; Firn auger; Neumayer Station (WMO89002); Permittivity, relative; Permittivity, relative, error
    Type: Dataset
    Format: text/tab-separated-values, 10850 data points
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  • 10
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    Physical properties of firn core DML60C98_02
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Calculated from density; Conductivity, specific; Conductivity, specific, error; Density, mass density; Density, standard deviation; Density-and-conductivity mixed permittivity (DECOMP); DEPTH, ice/snow; Depth water equivalent; Depth water equivalent, error; Dielectric profiling, DEP (Wilhelms, 2000); DML60C98_02; Dronning Maud Land, Antarctica; EPICA; EPICA_DML3; European Project for Ice Coring in Antarctica; FB9802; ICEDRILL; Ice drill; Neumayer Station (WMO89002); Permittivity, relative; Permittivity, relative, error
    Type: Dataset
    Format: text/tab-separated-values, 45372 data points
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