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  • 2020-2024  (27)
  • 1
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    Annual flood-layer thickness of sediment core POS362-2_33 (2024)
    PANGAEA
    Details
    Publication Date: 2024-07-03
    Description: The dataset provides a continuous record of layer thickness for sediments deposited during annual floods of the Nile River during the North African Humid Period (ca. 9.5-7.5 ka BP). The study site is located on the Nile deep-sea fan, where marine sediment core POS362_2_33 was collected in 2008. After subsampling the core, sediment blocks were embedded in resin and thin sections were cut. Layer identification, counting and thickness measurement were realised under the microscope. We provide here the raw flood-layer thickness as well as normalised (log-scale), detrended (differentiated) and filtered data on the depth and age scales. Further details can be found in the related manuscripts.
    Keywords: Age model, Bayesian; Calculated; Calendar age, maximum/old; Calendar age, median; Calendar age, minimum/young; Counted; DEPTH, sediment/rock; flood frequency; Flood frequency per 30 years, extreme strong flood; Flood frequency per 30 years, extreme weak flood; Flood highpass filtered, 9 years, logarithm; Flood layer thickness; Flood layer thickness, differentiated; Flood layer thickness, differentiated, logarithm; Flood layer thickness, logarithm; GC; Gravity corer; Green Sahara; Measured; Mediterranean Sea; Nile River; POS362/2; POS362-2_33; Poseidon; Varve
    Type: Dataset
    Format: text/tab-separated-values, 15650 data points
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    DATA PANGAEA
  • 2
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    Changepoints of annual flood-layer from sediment core POS362-2_33 (2024)
    PANGAEA
    Details
    Publication Date: 2024-07-03
    Description: The dataset provides information about changepoints identified in the sediment accumulation rate profile of marine core POS362_2_33. The study site is located on the Nile deep-sea fan and the core was collected in 2008. Using annual layer thickness determination (see doi:10.1594/PANGAEA.967743), sediment accumulation rates were calculated and eight changepoints were detected. We report here the depth and age of each changepoints and the number and average thickness of flood-layers between each changepoint. Further details can be found in the related
    Keywords: Age model, Bayesian; Calculated; Calendar age, maximum/old; Calendar age, minimum/young; Depth, bottom/max; Depth, top/min; flood frequency; Flood layer thickness; Flood layer thickness, standard deviation; GC; Gravity corer; Green Sahara; Identification; Mediterranean Sea; Nile River; Number; POS362/2; POS362-2_33; Poseidon; Sedimentation rate per year; Varve
    Type: Dataset
    Format: text/tab-separated-values, 72 data points
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    DATA PANGAEA
  • 3
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    AMOC modes linked with distinct North Atlantic deep water formation sites (2022)
    In:  EPIC3Climate Dynamics, 59(3-4), pp. 837-849, ISSN: 0930-7575
    Details
    Publication Date: 2023-12-31
    Description: The Atlantic Meridional Overturning Circulation (AMOC) is a tipping component of the climate system, with a quasi-global impact. Several numerical and observational studies emphasized two modes of AMOC variability, characterized by two distinct Atlantic sea surface temperature patterns. One is associated with centennial changes, the Trend Mode, and the other with the Atlantic Multidecadal Oscillation (AMO). The origin of the different manifestations of these modes it is not fully understood. Using observational data and an ocean general circulation model we present evidence that, whereas the Trend Mode is mainly linked with deep water formation in the Nordic Seas and with a North Atlantic AMOC cell centered at 50° N, AMO is related with deep water formation in the Labrador and Irminger Seas and with an overturning cell centered at 20° N. In combination with previous studies, these results imply that a main route of increasing atmospheric CO2 concentration influence on AMOC passes through deep water formation in the Nordic Seas and it is reflected in a subpolar North Atlantic meridional cell.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 4
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    A tree ring-based hydroclimate reconstruction for eastern Europe reveals large-scale teleconnection patterns (2022)
    In:  EPIC3Climate Dynamics, ISSN: 0930-7575
    Details
    Publication Date: 2023-12-31
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 5
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    Large-scale sea ice–Surface temperature variability linked to Atlantic meridional overturning circulation (2023)
    Public Library of Science (PLoS)
    In:  EPIC3PLOS ONE, Public Library of Science (PLoS), 18(8), pp. e0290437-e0290437, ISSN: 1932-6203
    Details
    Publication Date: 2023-08-31
    Description: Due to its involvement in numerous feedbacks, sea ice plays a crucial role not only for polar climate but also at global scale. We analyse state-of-the-art observed, reconstructed, and modelled sea-ice concentration (SIC) together with sea surface temperature (SST) to disentangle the influence of different forcing factors on the variability of these coupled fields. Canonical Correlation Analysis provides distinct pairs of coupled Arctic SIC–Atlantic SST variability which are linked to prominent oceanic and atmospheric modes of variability over the period 1854–2017. The first pair captures the behaviour of the Atlantic meridional overturning circulation (AMOC) while the third and can be associated with the North Atlantic Oscillation (NAO) in a physically consistent manner. The dominant global SIC–Atlantic SST coupled mode highlights the contrast between the responses of Arctic and Antarctic sea ice to changes in AMOC over the 1959–2021 period. Model results indicate that coupled SST–SIC patterns can be associated with changes in ocean circulation. We conclude that a correct representation of AMOC-induced coupled SST–SIC variability in climate models is essential to understand the past, present and future sea-ice evolution.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 6
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    Erwärmung der Meere, Ausdehnung der Tropen und anhaltende Dürren (2021)
    José L. Lozán, Siegmar-W. Breckle, Hartmut Graßl et al.
    In:  EPIC3Warnsignal Klima: Boden & Landnutzung, Warnsignal Klima: Boden & Landnutzung, José L. Lozán, Siegmar-W. Breckle, Hartmut Graßl et al., pp. 278-284, ISBN: 9783982006758
    Details
    Publication Date: 2023-03-13
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
    Format: application/pdf
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  • 7
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    Deconstructing Global Observed and Reanalysis Total Cloud Cover Fields Based on Pacific Climate Modes (2023)
    MDPI
    In:  EPIC3Atmosphere, MDPI, 14(3), pp. 456-456, ISSN: 0004-6973
    Details
    Publication Date: 2023-08-15
    Description: Clouds are notoriously difficult to simulate. Here, we separate and quantify the impact of Pacific climate modes on total cloud cover (TCC) variability, using reliable satellite observations together with state-of-the art reanalysis outputs, over the 1979–2020 period. The two most prominent modes of annual TCC variability show intense loadings over the Pacific basin and explain most of the variance in what could be considered the “signal” in satellite TCC data. Canonical correlation analysis (CCA) provides coupled TCC—sea surface temperature (SST) patterns that are linked to the Eastern Pacific (EP) ElNiño—Southern Oscillation (ENSO) and the Central Pacific (CP) ENSO in a physically consistent manner. The two ENSO modes dominate global coupled SST–TCC variability with the footprint of the CP ENSO explaining roughly half of the variance induced by the EP ENSO among these coupled fields. Both the EP and the CP ENSO exert an influence on Pacific decadal TCC variability. The impact of both ENSO modes on global total cloud cover variability is amplified by two positive feedbacks. These results could be used as a reference for model investigations on future projections of coupled TCC—SST variability responses to the CP and the EP ENSO.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 8
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    The linkage between autumn Barents-Kara sea ice and European cold winter extremes (2024)
    Frontiers
    In:  EPIC3Frontiers in Climate, Frontiers, 6, pp. 1345763-1345763, ISSN: 2624-9553
    Details
    Publication Date: 2024-04-22
    Description: While the Arctic's accelerated warming and sea ice decline have been associated with Eurasian cooling, debates persist between those attributing this to sea ice retreat and those to internal variability. Our study examines the association between autumn sea ice variability over the Barents-Kara Seas and extreme cold winters in Europe. Using the observational data and composite analysis, we explore the interannual variability and the potential linkage between sea ice and atmospheric circulation patterns. It reveals a correlation with shifts toward a negative phase of North Atlantic Oscillation and more frequent episodes of the atmospheric blocking over Greenland and the North Atlantic. Furthermore, the negative phase of the North Atlantic Oscillation and enhanced blocking are closely related and mutually reinforcing, shaping the spatial distribution of cold anomalies over much of the European continent. Our results suggest a link between the unusual decrease in Barents-Kara Sea ice during autumn and the occurrence of intense European weather extremes in subsequent winter months, emphasizing the need for delving deeper into this relationship on monthly time scales to enhance our predictive capabilities for midlatitude extreme events.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 9
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    European Summer Wet-Bulb Temperature: Spatiotemporal Variations and Potential Drivers (2024)
    American Meteorological Society
    In:  EPIC3Journal of Climate, American Meteorological Society, 37(6), pp. 2059-2080, ISSN: 0894-8755
    Details
    Publication Date: 2024-04-22
    Description: Heat stress is projected to intensify with global warming, causing significant socioeconomic impacts and threatening human health. Wet-bulb temperature (WBT), which combines temperature and humidity effects, is a useful indicator for assessing regional and global heat stress variability and trends. However, the variations of European WBT and their underlying mechanisms remain unclear. Using observations and reanalysis datasets, we demonstrate a remarkable warming of summer WBT during the period 1958–2021 over Europe. Specifically, the European summer WBT has increased by over 1.08C in the past 64 years. We find that the increase in European summer WBT is driven by both near-surface warming temperatures and increasing atmospheric moisture content. We identify four dominant modes of European summer WBT variability and investigate their linkage with the large-scale atmospheric circulation and sea surface temperature anomalies. The first two leading modes of the European WBT variability exhibit prominent interdecadal to long-term variations, mainly driven by a circumglobal wave train and concurrent sea surface temperature variations. The last two leading modes of European WBT variability mainly show interannual variations, indicating a direct and rapid response to large-scale atmospheric dynamics and nearby sea surface temperature variations. Further analysis shows the role of global warming and changes in midlatitude circulations in the variations of summer WBT. Our findings can enhance the understanding of plausible drivers of heat stress in Europe and provide valuable insights for regional decision-makers and climate adaptation planning.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 10
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    Hotspots for warm and dry summers in eastern Europe, with a focus on Romania (2021)
    Copernicus
    In:  EPIC3Natural Hazards and Earth System Sciences, Copernicus, 2021, pp. 1-34, ISSN: 1561-8633
    Details
    Publication Date: 2024-04-22
    Description: 〈jats:p〉Abstract. The combined effect of hot and dry extremes can have disastrous consequences for the society, economy, and the environment. While a significant number of studies have been conducted regarding the variability of the individual hot or dry extremes in Romania, the evaluation of the combined effect of these extremes (e.g. compound effect) is still lacking for this region. Thus, in this study we have assessed the spatio-temporal variability and trends of hot and dry summers in the eastern part of Europe, focusing on Romania, between 1950 and 2020 and we have analyzed the relationship between the frequency of hot summers and the prevailing large-scale atmospheric circulation. The length, spatial extent and frequency of HWs in Romania has increased significantly over the last 70 years, while for the drought conditions no significant changes have been observed. The rate of increase in the frequency and spatial extent of HWs has accelerated significantly after the 1990’s, while the smallest number of HWs was observed between 1970 and 1985. The hottest years, in terms of heatwave duration and frequency, were 2007, 2012, 2015, and 2019. One of the key drivers of hot summers, over our analyzed region, is the prevailing large-scale circulation, featuring an anticyclonic circulation over the central and eastern parts of Europe and enhanced atmospheric blocking activity associated with positive temperature anomalies underneath. We conclude that our study can help improve our understanding of the spatio-temporal variability of hot and dry summers, especially at the regional scale, as well as their driving mechanisms which might lead to a better predictability of these extreme events. 〈/jats:p〉
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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