scholarly journals SLR Estimation Using CEEMDAN Near the Korean Peninsula

2021 ◽  
Author(s):  
Young Jin Kim ◽  
Okyu Kwon ◽  
Hark-Soo Song ◽  
Jongho Kim ◽  
Hyuk Kang
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Empirical Mode Decomposition ◽  
Southern Oscillation ◽  
Ensemble Empirical Mode Decomposition ◽  
Sea Level Changes ◽  
Intergovernmental Panel ◽  
Sea Levels ◽  
Mode Decomposition ◽  
Rise Rate

Abstract The rise of sea levels due to global warming is a problem of concern at an international scope and the causes are already known relatively clearly. Every year, the Intergovernmental Panel on Climate Change (IPCC) creates a scenario for greenhouse gas emissions and predicts the global average sea-level rise rate accordingly. It is necessary to estimate the rate of sea-level rise to date in creating such a scenario. In particular, since the height of the sea level changes (SLC) continuously, the errors of SLC may occur due to various causes with a fragmental analysis. To estimate the sea-level rise accurately, we applied Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (CEEMDAN) is based on the Empirical Mode Decomposition (EMD) to decompose the tidal level. Through this, we discover that the differences in the local sea-level rise rate occurred even within a small area. To understand each component of tide level decomposed through CEEMDAN, we confirm the component-wise/regional correlation between tidal stations. In addition, we looked at how local sea-level rise correlated with the global meteorological phenomenon, El Niño-Southern Oscillation (ENSO) which is one of the most influential recurring climate patterns Socioeconomically.

Venice lagoon salt marsh vulnerability and halophytic vegetation vertical migration in response to sea level rise

2020 ◽  
Author(s):  
Zhicheng Yang ◽  
Sonia Silvestri ◽  
Marco Marani ◽  
Andrea D’Alpaos
Keyword(s):  
Salt Marsh ◽  
Sea Level Rise ◽  
Sea Level ◽  
Salt Marshes ◽  
Current Knowledge ◽  
Venice Lagoon ◽  
Sea Level Changes ◽  
Human Pressure ◽  
Sea Levels ◽  
Vegetation Species

<p>Salt marshes are biogeomorphic systems that provide important ecosystem services such as carbon sequestration and prevention of coastal erosion. These ecosystems are, however, threatened by increasing sea levels and human pressure. Improving current knowledge of salt-marsh response to changes in the environmental forcing is a key step to understand and predict salt-marsh evolution, especially under accelerated sea level rise scenarios and increasing human pressure. Towards this goal, we have analyzed field observations of marsh topographic changes and halophytic vegetation distribution with elevation collected over 20 years (between 2000 and 2019) in a representative marsh in the Venice lagoon (Italy).</p><p>Our results suggest that: 1) on average, marsh elevation with respect to local mean sea level decreased , (i.e. the surface accretion rate was lower than the rate of sea level rise); 2) elevational frequency distributions are characteristic for different halophytic vegetation species, highlighting different ecological realized niches that change in time; 3) although the preferential elevations at which different species have changed in time, the sequence of vegetation species with increasing soil elevation was preserved and simply shifted upward; 4) we observed different vegetation migration rates for the different species, suggesting that the migration process is species-specific. In particular, vegetation species colonizing marsh edges (Juncus and Inula) migrated faster facing to changes in sea levels than Limonium and Spartina , while Sarcocornia was characterized by delayed migration in response to sea level changes. These results bear significant implications for long-term biogeomorphic evolution of tidal environments.</p>

scholarly journals Low-End Probabilistic Sea-Level Projections

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1507 ◽  
Author(s):  
Gonéri Le Cozannet ◽  
Rémi Thiéblemont ◽  
Jeremy Rohmer ◽  
Déborah Idier ◽  
Jean-Charles Manceau ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Coupled Model ◽  
Climate Mitigation ◽  
Sea Level Changes ◽  
Sea Levels ◽  
Intercomparison Project ◽  
Business As Usual ◽  
Change Mitigation ◽  
Selection Of

In the area of sea-level rise, recent research has focused on assessing either likely or high end future sea levels, but less attention has been given to “low-end” sea-level projections, exploring best-case potential sea-level changes and providing the basis for estimating minimum adaptation needs. Here, we provide global and regional probabilistic sea-level projections using conservative projections of glaciers and ice-sheets melting and a selection of models from the Coupled Model Intercomparison Project phase 5 (CMIP5) delivering moderate thermal expansion. Our low-end sea-level projections are higher than previously estimated because they rely on modeling outcomes only, and do not add any expert judgement, aiming essentially at delivering more realistic upper tails. While there are good reasons to believe that our projections are excessively optimistic, they can be used as low-end sea-level projections in order to inform users with low aversion to uncertainty. Our low-end sea-level projection exceeds 0.5 m along most inhabited coasts by 2100 for business as usual greenhouse gas emissions (RCP8.5), which is relevant for adaptation practitioners as long as efficient climate change mitigation policies are not implemented. This means that without efficient climate mitigation, an acceleration of sea-level rise can hardly be avoided during the 21st century.

Study on climate change impacts of sea level rise on the Saemangeum Sea Dike using the EEMD method

2021 ◽  
Author(s):  
Baeg Lee ◽  
Hyun-Han Kwon
Keyword(s):  
Climate Change ◽  
Sea Level Rise ◽  
Sea Level ◽  
Linear Regression Analysis ◽  
Climate Change Impacts ◽  
Ensemble Empirical Mode Decomposition ◽  
Mode Decomposition ◽  
Eemd Method ◽  
The Impact ◽  
Sea Dike

<p>The Saemangeum Sea Dike, completed in 2011 in South Korea, is the longest sea dike in the world. One of the most pressing issues of today, climate change leads to sea level rise that could increase the risk of sea dike overflow. However, what impact climate change will have on the Saemangeum Sea Dike has not been verified yet. Here, we estimate the impacts of sea level rise on the Saemangeum Sea Dike, using the Linear Regression Analysis method and the Ensemble Empirical Mode Decomposition (EEMD) method. The sea level data of the Saemangeum area of the last 30 years was analysed and the results showed that the maximum rate of sea level rise of the Saemangeum Sea Dike is at 2.51 mm/year when the EEMD method was applied. It means that the impact of sea level rise on the Saemangeum sea dike is reasonably low because the sea level rise will exceed the freeboard after 366 years, so there is currently no clear sign that it poses a problem.</p>

Ensemble Empirical Mode Decomposition on Storm Surge Separation from Sea Level Data

2011 ◽  
Vol 53 (3) ◽  
pp. 223-243 ◽  
Author(s):  
Li-Chung Wu ◽  
Chia Chuen Kao ◽  
Tai-Wen Hsu ◽  
Kuo-Ching Jao ◽  
Yi-Fung Wang
Keyword(s):  
Sea Level ◽  
Empirical Mode Decomposition ◽  
Storm Surge ◽  
Ensemble Empirical Mode Decomposition ◽  
Mode Decomposition ◽  
Level Data

scholarly journals Sea-Level Rise and Shoreline Changes Along an Open Sandy Coast: Case Study of Gulf of Taranto, Italy

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1414 ◽  
Author(s):  
Giovanni Scardino ◽  
François Sabatier ◽  
Giovanni Scicchitano ◽  
Arcangelo Piscitelli ◽  
Maurilio Milella ◽  
...  
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Anthropogenic Factors ◽  
Sea Level Changes ◽  
Intergovernmental Panel ◽  
Coastal System ◽  
Shoreline Evolution ◽  
Sandy Coast ◽  
Climate Change Assessment ◽  
Sedimentary Budget

The dynamics of the sandy coast between Castellaneta and Taranto (Southern Italy) has been influenced by many natural and anthropogenic factors, resulting in significant changes in the coastal system over the last century. The interactions between vertical components of sea-level changes and horizontal components of the sedimentary budget, in combination with anthropogenic impact, have resulted in different erosion and accretion phases in the past years. Local isostatic, eustatic, and vertical tectonic movements, together with sedimentary budget changes, must be considered in order to predict the shoreline evolution and future marine submersion. In this study, all morpho-topographic data available for the Gulf of Taranto, in combination with Vertical Land Movements and sea-level rise trends, were considered by assessing the local evolution of the coastal trend as well as the future marine submersion. Based on the predicted spatial and temporal coastal changes, a new predictive model of submersion was developed to support coastal management in sea-level rise conditions over the next decades. After that, a multi-temporal mathematical model of coastal submersion was implemented in a Matlab environment. Finally, the effects of the relative sea-level rise on the coastal surface prone to submersion, according to the Intergovernmental Panel on Climate Change Assessment Reports (AR) 5 Representative Concentration Pathways (RCP) 2.6 and RCP 8.5 scenarios, were evaluated up to 2100.

scholarly journals Natural Variability and Vertical Land Motion Contributions in the Mediterranean Sea-Level Records over the Last Two Centuries and Projections for 2100

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1480 ◽  
Author(s):  
Vecchio ◽  
Anzidei ◽  
Serpelloni ◽  
Florindo
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Venice Lagoon ◽  
Natural Variability ◽  
Climatic Data ◽  
Sea Levels ◽  
Vertical Land Motion ◽  
Mode Decomposition ◽  
Tidal Data ◽  
Continuous Gps

We analyzed a set of geodetic data to investigate the contribution of local factors, namely the sea level natural variability (SLNV) and the vertical land motion (VLM), to the sea-level trend. The SLNV is analyzed through the Empirical Mode Decomposition (EMD) on tidal data (>60 years of recordings) and results are used to evaluate its effects on sea levels. The VLM is measured at a set of continuous GPS (cGPS) stations (>5 years of recordings), located nearby the tide gauges. By combining VLM and SLNV with IPCC-AR5 regional projections of climatic data (Representative Concentration Pathways (RCP) 2.6 and 8.5), we provide relative sea-level rise projections by 2100. Results show that the combined effects of SLNV and VLM are not negligible, contributing between 15% and 65% to the sea-level variability. Expected sea levels for 2100 in the RCP8.5 scenario are between 475 ± 203 (Bakar) and 818 ± 250 mm (Venice). In the Venice Lagoon, the mean land subsidence at 3.3 ± 0.85 mm a−1 (locally up to 8.45 ± 1.69 mm a−1) is driving the local sea-level rise acceleration.

Relative sea-level rise during the Main Postglacial Transgression in NE Scotland, U.K.

1999 ◽  
Vol 90 (1) ◽  
pp. 1-27 ◽  
Author(s):  
D. E. Smith ◽  
C. R. Firth ◽  
C. L. Brooks ◽  
M. Robinson ◽  
P. E. F. Collins
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Sea Level Changes ◽  
Relative Sea Level ◽  
Sea Levels ◽  
Relative Sea Level Rise ◽  
The Mean ◽  
Run Up ◽  
Storegga Slide

AbstractFlandrian (Holocene) relative sea level changes in the lower Ythan valley, NE Scotland, U.K., are inferred from detailed stratigraphical evidence including microfossil analysis and radiocarbon assay. The principal event recorded is the Main Postglacial Transgression, which was under way in the area by c. 8300 and had culminated before c. 4000 radiocarbon years BP. It is concluded that the rise in relative sea levels during the transgression in the area exceeded 12 m; that the mean rate of rise there was 8·05 mm a−1 between c. 8300 and c. 7100 radiocarbon years BP, or 7·09 mm a−1 based upon calibrated dates for the same period, before declining markedly to 1·75 mm a−1 (radiocarbon) or 1·86 mm a−1 (calibrated) to the culmination of the event. By comparison with other sites, the culmination appears to have been time-transgressive in eastern Scotland. Deposits of the Second Storegga Slide tsunami, which occurred during the Main Postglacial Transgression, are present in the Ythan valley, where the sediment run-up of the event at the sites studied is estimated to have been within the range 2·99–5·19 m.

scholarly journals Rise and fall of sea level in Nauru area over a nodal cycle

2010 ◽  
Vol 28 (1) ◽  
pp. 63
Author(s):  
Muhammad Ali S. Hussein ◽  
Awnesh Singh ◽  
Than Aung
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
South Pacific ◽  
Pacific Island ◽  
Sea Levels ◽  
Level Data ◽  
Rise Rate ◽  
Pacific Island Countries ◽  
Set Up ◽  
Data Length

The sea level rise issue is one of the major topics that have gained global attention. In particular, its impacts on many Pacific island countries have been more prevalent over the last two decades. The tiny island of Nauru, once a wealthy nation, is no exception to the effect of climate change. With its highest point ~61 m above sea level, and the threat of sea level rise evident, Nauru is under pressure to save itself from sea level rise problem. Sea level data from the AusAID funded South Pacific Sea Level and Climate Monitoring Project will be focussed on despite the fact that the length of data is not sufficiently long. The project was set up in response to concerns raised by Pacific island countries over the potential impacts of an enhanced greenhouse effect on climate and sea levels in the South Pacific for 20 years initially. Based upon 17 years of sea level data from the project, the sea level rise rate in Nauru as at July 2010 was 4.4 mm yr–1. This is at least 2–3 times higher than the global average of 1–2 mm yr–1. Sea level in the Nauru area has risen approximately 7.5 cm since the inception of the project 17 years ago (July 1993). Although there is no significant impact on the sea level trends, it is to be noted that the land is quite stable and the rate of land rising is 0.01 mm yr–1. Although the data length is for the last 17 years, the sea level trend values do not fluctuate significantly since 2002. It simply indicates that the rate of sea level rise in the Nauru region is not accelerating as anticipated by the community.

scholarly journals Land–Ocean–Atmosphere Influences on Groundwater Variability in the South Atlantic–Gulf Region

Hydrology ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 71 ◽  
Author(s):  
Neekita Joshi ◽  
Ajay Kalra ◽  
Kenneth W. Lamb
Keyword(s):  
Sea Level ◽  
Southern Oscillation ◽  
Sea Level Changes ◽  
Gulf Region ◽  
Intergovernmental Panel ◽  
Sst Variability ◽  
Terrestrial Water ◽  
Hydrologic Unit Code ◽  
Value Decomposition ◽  
And Sea Level

Climate association between Groundwater Storage (GWS) and sea level changes have been missing from the Intergovernmental Panel on Climate Change, demanding a requisite study of their linkage and responses. Variability in the Hydrologic Unit Code—03 region, i.e., one of the major U.S. watersheds in the southeast caused by Sea Surface Temperature (SST) variability in the Pacific and Atlantic Ocean, was identified. Furthermore, the SST regions were identified to assess its relationship with GWS, sea level, precipitation, and terrestrial water storage. Temporal and spatial variability were obtained utilizing the singular value decomposition statistical method. A gridded GWS anomaly from the Gravity Recovery and Climate Experiment (GRACE) was used to understand the relationship with sea level and SST. The negative pockets of SST were negatively linked with GWS. The identification of teleconnections with groundwater may substantiate temporal patterns of groundwater variability. The results confirmed that the SST regions exhibited El Niño Southern Oscillation patterns, resulting in GWS changes. Moreover, a positive correlation between GWS and sea level was observed on the east coast in contrast to the southwestern United States. The findings highlight the importance of climate-driven changes in groundwater attributing changes in sea level. Therefore, SST could be a good predictor, possibly utilized for prior assessment of variabilities plus groundwater forecasting.

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