Sönke Dangendorf

Sönke Dangendorf
Tulane University | TU · River-Coastal Science and Engineering

Dr.-Ing.

About

119
Publications
31,149
Reads
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3,253
Citations
Additional affiliations
December 2019 - present
Old Dominion University
Position
  • Professor (Assistant)
November 2016 - December 2019
Universität Siegen
Position
  • Akademischer Rat
September 2014 - October 2015
Universität Siegen
Position
  • Researcher

Publications

Publications (119)
Article
Full-text available
The rate at which global mean sea level (GMSL) rose during the 20th century is uncertain, with little consensus between various reconstructions that indicate rates of rise ranging from 1.3 to 2 mm⋅y−1. Here we present a 20th-century GMSL reconstruction computed using an area-weighting technique for averaging tide gauge records that both incorporate...
Article
Full-text available
Monthly observations are used to study the relationship between the Atlantic meridional overturning circulation (AMOC) at 26° N and sea level (ζ) on the New England coast (northeastern United States) over nonseasonal timescales during 2004–2017. Variability in ζ is anticorrelated with AMOC on intraseasonal and interannual timescales. This anticorre...
Article
Full-text available
Previous studies reconstructed twentieth-century global mean sea level (GMSL) from sparse tide-gauge records to understand whether the recent high rates obtained from satellite altimetry are part of a longer-term acceleration. However, these analyses used techniques that can only accurately capture either the trend or the variability in GMSL, but n...
Article
Full-text available
The rate of global-mean sea-level rise since 1900 has varied over time, but the contributing factors are still poorly understood¹. Previous assessments found that the summed contributions of ice-mass loss, terrestrial water storage and thermal expansion of the ocean could not be reconciled with observed changes in global-mean sea level, implying th...
Article
Full-text available
Understanding historical and projected coastal sea-level change is limited because the impact of large-scale ocean dynamics is not well constrained. Here, we use a global set of tide-gauge records over nine regions to analyse the relationship between coastal sea-level variability and open-ocean steric height, related to density fluctuations. Intera...
Article
Full-text available
We address the challenge, due to sparse observational records, of investigating long-term changes in the storm surge climate globally. We use two centennial and three satellite-era daily storm surge time series from the Global Storm Surge Reconstructions (GSSR) database and assess trends in the magnitude and frequency of extreme storm surge events...
Article
This paper presents the results of the subproject AMSeL_Ostsee A (03KIS0114). The primary goal was the determination of high-quality monthly mean sea level time series (MSL) along the southwestern Baltic Sea coast and the subsequent investigation of long-term changes and variability. As a result, 49 MSL time series with a respective length of more...
Article
The collaborative project AMSeL_Baltic Sea (03KIS0114 & 03KIS0115) was carried out between 2015 and 2018 by the Research Institute for Water and Environment (fwu) at the University of Siegen and the Institute of Hydraulic Engineering at the Technical University Hamburg-Harburg. In particular, the investigation concentrated on the research, acquisit...
Article
Full-text available
Coastal communities across the United States (U.S.) are experiencing an increase in the frequency of high‐tide flooding (HTF). This increase is mainly due to sea‐level rise (SLR), but other factors such as intra‐ to inter‐annual mean sea level variability, tidal anomalies, and non‐tidal residuals also contribute to HTF events. Here we introduce a n...
Article
Full-text available
In this paper we present new proxy‐based sea‐level reconstructions for southern New Zealand spanning the last millennium. These palaeo sea‐level records usefully complement sparse Southern Hemisphere proxy and tide‐gauge sea‐level datasets and, in combination with instrumental observations, can test hypotheses about the drivers of 20th century glob...
Article
A regional numerical ocean model of the Gulf Stream (GS) and the US East Coast was used to conduct sensitivity experiments of the dynamic response to temperature anomalies originated at different Atlantic locations. In a series of experiments, temperature anomalies were injected into the model domain through inflow boundary conditions at either the...
Article
Full-text available
Plain Language Summary ARs drive hydrological hazards over land related to extreme precipitation. As they make landfall, ARs typically bring heavy rains, strong winds, and low pressures to the coast. While these factors can cause storm surge and coastal flooding, little attention has been paid to possible coastal impacts of ARs. We establish relati...
Article
A new approach for analysis of spatiotemporal variability across ocean basins was tested using global 1° × 1° monthly sea level reconstruction (RecSL) for 1900–2015. Each sea level cross section η(x,t) was converted into a single time series that contains both spatial and temporal variabilities by connecting back and forth repeated monthly sections...
Article
We present the results of the sub-project MSL_Absolut-Rek (03KIS116). The primary goal of the project was the spatial and temporal reconstruction of mean sea level (MSL) along the German coastlines since the early 20th century under the consideration of vertical land motion (VLM). A novel hybrid reconstruction approach has been developed, which fir...
Article
Full-text available
Global sea level reconstruction (RecSL) for 1900–2015 was used to estimate the variations in oceanic kinetic energy (OKE) and compare OKE with changes in wind patterns and wind kinetic energy (WKE); the comparison was done for each latitude and for 5 western boundary currents (WBCs). Two contributors to variability in sea level were analyzed: gravi...
Article
Full-text available
Sea level in the South Atlantic Ocean has only been measured at a small number of tide-gauge locations, which causes considerable uncertainty in 20th-century sea-level trend estimates in this basin. To obtain a better-constrained sea-level trend in the South Atlantic Ocean, this study aims to answer two questions. The first question is: can we comb...
Article
Full-text available
Mean and extreme sea-level uncertainties, as well as uncertainty about future flood exposure, hinder the risk-based optimisation of flood protection investments. To deal with these uncertainties, cost-benefit analysis (CBA) and methods for robust decision-making can be combined. This paper sequentially applies CBA, robust optimisation methods and i...
Article
Full-text available
We document an exceptional large‐spatial scale case of changes in tidal range in the North Sea, featuring pronounced trends between ‐2.3 mm/yr at tide gauges in the UK and up to 7 mm/yr in the German Bight between 1958 and 2014. These changes are spatially heterogeneous and driven by a superposition of local and large‐scale processes within the bas...
Article
Full-text available
A new monthly global sea level reconstruction for 1900–2015 was analyzed and compared with various observations to examine regional variability and trends in the ocean dynamics of the western North Atlantic Ocean and the US East Coast. Proxies of the Gulf Stream (GS) strength in the Mid-Atlantic Bight (GS-MAB) and in the South Atlantic Bight (GS-SA...
Poster
Over the 20th century a global mean sea level (GMSL) rise of about 1.3 to 2 mm/yr could be observed and it is projected to further accelerate throughout the 21st century (Church and White 2006, Hay et al., 2015; Dangendorf et al., 2017). However, GMSL rise is neither temporally nor spatially uniform. Because of a number of different factors (e.g. m...
Preprint
Full-text available
Abstract In many places around the world, tide gauges have been measuring substantial non-astronomical changes. Here we document an exceptional large spatial scale case of changes in tidal range in the North Sea, featuring pronounced trends between -2.3 mm/yr in the UK and up to 7 mm/yr in the German Bight between 1958 and 2014. These changes are...
Preprint
Full-text available
Abstract. A new monthly global sea level reconstruction for 1900–2015 was analyzed and compared with various observations to examine regional variability and trends in the ocean dynamics of the western North Atlantic Ocean and the U.S. East Coast. A proxy of the Gulf Stream (GS) strength in the Mid-Atlantic Bight (GS-MAB) and in the South Atlantic...
Article
Full-text available
Scientists and engineers have observed for some time that tidal amplitudes at many locations are shifting considerably due to non-astronomical factors. Here we review comprehensively these important changes in tidal properties, many of which remain poorly understood. Over long geological time-scales, tectonic processes drive variations in basin siz...
Article
Full-text available
The Atlantic coast of North America north of Cape Hatteras has been proposed as a “hotspot” of late 20th century sea‐level rise. Here we test, using salt‐marsh proxy sea‐level records, if this coast experienced enhanced sea‐level rise over earlier multidecadal‐centennial periods. Whilst we find in agreement with previous studies that 20th century r...
Article
Full-text available
Assessments of flood exposure and risk are usually conducted for individual events with a specific peak water level and hydrograph, without considering variations in the temporal evolution (duration and intensity) of storm surges. Here we investigate the influence of temporal variability of storm surge events on flood characteristics in coastal zon...
Poster
Full-text available
In March 2019 cyclone Idai led to a compound flooding event in Mozambique combining high river runoff and storm induced water level extremes and causing damages up to 2 billion USD and more than 1200 fatalities. The co-occurrence of storm surges, wind waves, and flooding through heavy precipitation and runoff increases the risk of flooding and exac...
Article
Full-text available
The nature of mean sea level variation over the global coastal ocean is considered based on 219 historical tide gauge records and three barotropic ocean circulation models forced by reanalysis surface air pressure and wind stress. The consistency of the models and their ability to reproduce the data are considered on nonseasonal timescales (seasona...
Data
A novel high quality monthly mean sea level (MSL) dataset for 63 tide gauge stations at the german Baltic coastline until 2015. The dataset was generated in the AMSeL_Baltic Sea research project from 2015 to 2018. We generated a new monthly mean sea level datasets from high-resolution sea level measurements and combined these with historic datasets...
Poster
Full-text available
Over the last decades, changing tides have been reported for the German North Sea coast, a highly complex and sensitive system, which is subject to ongoing hydro- and morphodynamic changes. While mean sea level trends over the past 150 years have roughly followed the global mean, analyses of the mean tidal high and low water levels indicate signif...
Poster
Full-text available
In this contribution we present a comprehensive analysis of sea level data around the Baltic Sea from 1777 to the present with a focus on the southwestern part, concentrating on quantifying and understanding long-term trends and the influence of inter-annual and decadal variability. Our analysis focuses on a new monthly mean sea level (MSL) dataset...
Article
Full-text available
We analyzed changes in mean sea level (MSL) for the period 1950–2015 using a regional ocean model for the Baltic Sea. Sensitivity experiments allowed us to separate external from local drivers and to investigate individual forcing agents triggering basin-internal spatial variations. The model reveals a basin-average MSL rise (MSLR) of 2.08 ± 0.49 m...
Article
Full-text available
This paper describes a framework in which artificial extreme sea levels (ESLs) can be generated for use in flood risk analyses. Such analyses require large numbers of events to accurately assess the risk associated with certain return water levels and quantify uncertainties surrounding the temporal variability of ESL events. Stochastic models satis...
Article
Full-text available
Regional sea-level rise is characterized by decadal acceleration and deceleration periods that typically stem from oceanic climate variability. Here, we investigate decadal sea-level trends during the altimetry era and pin down the associated ocean circulation changes. We find that decadal subpolar gyre cooling (warming), strengthening (weakening),...
Article
Full-text available
Global mean sea level has risen over the 20th century (Hay et al. 2015; Dangendorf et al. 2017) and under sustained greenhouse gas emissions it is projected to further accelerate throughout the 21st century (Church et al. 2013) with large spatial variations, significantly threatening coastal communities. Locally the effects of geocentric (sometimes...
Article
Storm surges are one of the most dangerous natural hazards in coastal areas and have the ability to cause great damages including fatalities. To be prepared when another storm surge hits the coast, reliable storm surge forecasts are indispensable. Storm surge warnings are routinely provided for selected tide gauge locations along a coastline throug...
Conference Paper
Full-text available
Storm surges are one of the most dangerous natural hazards in coastal areas. To be prepared when another storm surge hits the coast, reliable storm surge forecasts are indispensable. Currently water level forecasts in the German Bight are, however, limited to a certain number of tide gauges along the coast, and the complex coastal geometry does not...
Article
Full-text available
Rising sea levels due to climate change can have severe consequences for coastal populations and ecosystems all around the world. Understanding and projecting sea-level rise is especially important for low-lying countries such as the Netherlands. It is of specific interest for vulnerable ecological and morphodynamic regions, such as the Wadden Sea...
Article
Full-text available
Global mean sea level is an integral of changes occurring in the climate system in response to un-forced climate variability as well as natural and anthropogenic forcing factors. Its temporal evolution allows changes (e.g., acceleration) to be detected in one or more components. Study of the sea-level budget provides constraints on missing or poorl...
Article
Global mean sea level is an integral of changes occurring in the climate system in response to unforced climate variability as well as natural and anthropogenic forcing factors. Its temporal evolution allows changes (e.g., acceleration) to be detected in one or more components. Study of the sea-level budget provides constraints on missing or poorly...
Presentation
Full-text available
Storm surges are one of the most dangerous natural hazards in coastal areas. To be prepared when another storm surge hits the coast, reliable storm surge forecasts are indispensable. The focus of this presentation was on the development of a model chain providing real-time flood risk warnings for any coastal site. Therefore, a new methodology based...
Presentation
Global mean sea level has risen over the 20th century (Hay et al. 2015; Dangendorf et al. 2017) and under sustained greenhouse gas emissions it is projected to further accelerate throughout the 21st century (Church et al. 2013) with large spatial variations, significantly threatening coastal communities. Locally the effects of geocentric (sometimes...
Poster
Full-text available
In this presentation we introduce a novel monthly mean sea level (MSL) dataset from 140 tide gauge records in the Baltic Sea covering a period from 1777 to 2015. The dataset has been produced within the BMBF project “AMSeL Baltic Sea” in which we collected high resolution tide gauge data and digitized historical sea level records of varying tempora...
Article
Full-text available
In December 2015, 195 countries agreed in Paris to hold the increase in global mean surface temperature (GMST) well below 2.0 °C above pre-industrial levels and to pursue efforts to limit the temperature increase to 1.5 °C. Since large financial flows will be needed to keep GMSTs below these targets, it is important to know how GMST has progressed...
Article
Full-text available
Coastal and estuarine regions are particularly vulnerable against the impacts of man-made climate change. Therefore, a systematic analysis of potential changes in tidal dynamics and riverine discharge is a fundamental prerequisite for developing sustainable coastal protection strategies in these regions. Such analyses are noticeably absent for the...
Article
Different sea level reconstructions show a spread in sea level rise over the last six decades and it is not yet certain whether the sum of contributors explains the reconstructed rise. Possible causes for this spread are, among others, vertical land motion at tide-gauge locations and the sparse sampling of the spatially variable ocean. To assess th...
Article
Full-text available
Northern European sea levels show a non-stationary link to the North Atlantic Oscillation (NAO). The location of the centers of the NAO dipole, however, can be affected through the interplay with the East Atlantic (EAP) and the Scandinavian (SCAN) teleconnection patterns. Our results indicate the importance of accounting for the binary combination...
Article
Assessing the vertical land motion (VLM) at tide gauges (TG) is crucial to understanding global and regional mean sea-level changes (SLC) over the last century. However, estimating VLM with accuracy better than a few tenths of a millimeter per year is not a trivial undertaking and many factors, including the reference frame uncertainty, must be con...