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  • English  (3)
  • German  (1)
  • 1
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    Reconstruction of late Holocene autumn/winter precipitation variability in SW Romania from a high-resolution speleothem trace element record (2018)
    In:  Earth and Planetary Science Letters
    Details
    Publication Date: 2020-02-12
    Description: We present the first high-resolution trace element (Mg/Ca, Sr/Ca, Ba/Ca) record from a stalagmite in southwestern Romania covering the last 3.6 ka, which provides the potential for quantitative climate reconstruction. Precise age control is based on three independent dating methods, in particular for the last 250 yr, where chemical lamina counting is combined with the identification of the 20th century radiocarbon bomb peak and 230Th/U dating. Long-term cave monitoring and model simulations of drip water and speleothem elemental variability indicate that precipitation-related processes are the main drivers of speleothem Mg/Ca ratios. Calibration against instrumental climate data shows a significant anti-correlation of speleothem Mg/Ca ratios with autumn/winter (October to March) precipitation (r = −0.61, p 〈 0.01), which is statistically robust when considering age uncertainties and auto-correlation. This relationship is used to develop a quantitative reconstruction of autumn/winter precipitation. During the late Holocene, our data suggest a heterogeneous pattern of past regional winter hydroclimate in the Carpathian/Balkan realm, along with intermittent weakening of the dominant influence of North Atlantic forcing. In agreement with other regional paleo-hydrological reconstructions, the observed variability reveals periodically occurring strong NW–SE hydro-climate gradients. We hypothesize, that this pattern is caused by shifts of the eastern edge of the area of influence of the NAO across central-eastern Europe due to the confluence of North Atlantic forcing, and other climatic features such as the East Atlantic/Western Russia (EAWR) pattern.
    Language: English
    Type: info:eu-repo/semantics/article
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  • 2
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    Estimating the sea-level contribution from mass loading on the Norwegian shelf using hydrographic in-situ data, satellite altimetry and GRACE (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
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    Publication Date: 2023-06-20
    Description: Future sea-level rise on shallow continental shelves differs in one important aspect from open ocean sea-level rise: the local steric effect, that is the change in the water column height due to changes in sea water density, plays a minor role compared to the much deeper open ocean. Instead, the bulk of oceanic sea-level rise on continental shelves arises from an increase in ocean water mass that is being imported from the open ocean – the so-called shelf mass loading (SML). This redistribution is mainly driven by thermal expansion of water masses below shelf depth and magnifies as the subsurface ocean layers continue to warm.Few studies have tried to detect SML as the signal is only expected to become dominant over decadal to multidecadal periods given the large natural variability in shallow regions. Here, we combine hydrographic data from a section crossing the Norwegian shelf, with observations of total sea-level change from altimetry and estimates of mass changes from GRACE gravity missions to estimate the strength of SML over the past decades. We compare the residual of total sea level (from altimetry) and steric height (from hydrography) with GRACE estimates from three different solutions. Over the common period (2002 -2020), both estimates show a consistently higher trend over the shallow shelf area compared to the deep ocean. We estimate the shelf mass contribution in the order of 0.5 – 1.0 mm/yr, depending on the GRACE solution selected.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 3
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    Detection and attribution of intra-annual mass component of sea-level variations along the Norwegian coast (2023)
    In:  XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
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    Publication Date: 2023-06-28
    Description: Reliable sea-level observations in coastal regions are needed to assess the impact of sea level on coastal communities and ecosystems. This paper evaluates the ability of in-situ and remote sensing instruments to monitor and help explain the mass component of sea level along the coast of Norway. The general agreement between three different GRACE mascon solutions and a combination of coastal satellite altimetry and hydrography gives us confidence to explore the mass component of sea level in coastal areas on intra-annual timescales. At first, the estimates reveal a large spatial-scale coherence of the sea-level mass component on the shelf, which agrees with Ekman theory. Then, they suggest a link between the mass component of sea level and the along-slope winds integrated along the eastern boundary of the North Atlantic, which agrees with the theory of poleward propagating coastal trapped waves. Our results give us confidence in the sea-level mass component from GRACE, satellite altimetry and the hydrographic stations over the Norwegian shelf. Moreover, they indicate that GRACE can be used to monitor and understand the intra-annual variability of the mass component of sea level in the coastal ocean, especially where in-situ measurements are sparse or absent.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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  • 4
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    Untersuchungen zur Chronostratigraphie mariner Terrassen in Mittelitalien—230Th/234U- und ESR-Datierungen an fossilen Mollusken (2011)
    Geozon Science Media
    Details
    Publication Date: 2021-03-29
    Description: Durch die ESR-Altersbestimmungsmethode (Elektronenspin Resonanz) sowie die 230Th/234U-Datierung fossiler Muscheln bei Tarquinia (Latium) konnte die stratigraphische Einordnung tektonisch verstellter thyrrenzeitlicher mariner Terrassen geklärt werden. Zwischen den Flüssen Mignone und Marta liegt die Terrasse des Euthyrren I (100 000—120 000 BP) heute in einer Höhe von 40—45 m ü. M. und die Küstenlinie des Euthyrren II (200 000—220 000 BP) ca. 65m ü. M. Sie liegen damit deutlich höher als alle bisher gefundenen euthyrrenzeitlichen Terrassen in Mittelitalien.
    Description: research
    Keywords: 551.7 ; VAR 000 ; Glazialgeologie ; pleistocene ; pléistocène ; shoreline ; chronostratigraphy ; marine terrace ; sampling ; electron spin resonance ; th 230-u234-isotop ; beachrock ; epeirogeny ; bivales ; fossilerous localities ; latium ; mignoe marta region
    Language: German
    Type: article , publishedVersion
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