Sea Level Rise

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Introduction

Since 1880, global mean sea level (GMSL) has risen by 8-9 inches (21-24 centimeters) [1]. This rise is mainly attributed to two outcomes of global warming: the melting of glaciers and ice sheets, and ocean expansion due to increasing ocean temperatures. The GMSL rise is also accelerating. GMSL from tide gauges and altimetry observations increased from 1.4 mm yr–1 over the period 1901–1990 to 2.1 mm yr–1 over the period 1970–2015 to 3.2 mm yr–1 over the period 1993–2015 to 3.6 mm yr–1 over the period 2006–2015[2].

Rising sea levels threaten personal property and infrastructure of coastal cities and towns as well as coastal ecosystems. It also worsens the devastation of natural disasters like hurricanes and tsunamis, which can reach farther inland. Average sea level rise in the U.S. is projected to be 7.2 feet (2.2 meters) by 2100, and 13 feet (3.9 meters) by 2150 with current global temperature and glacial retreat models[1].

Rising mean and increasingly extreme sea level threaten coastal zones through a range of coastal hazards including (i) the permanent submergence of land by higher mean sea levels or mean high tides; (ii) more frequent or intense coastal flooding; (iii) enhanced coastal erosion; (iv) loss and change of coastal ecosystems; (v) salinisation of soils, ground and surface water; and (vi) impeded drainage. At the century scale and without adaptation, the vast majority of low-lying islands, coasts and communities face substantial risk from these coastal hazards, whether they are urban or rural, continental or island, at any latitude, and irrespective of their level of development[2].

Dataset

Dataset Description Map viewer and/or Data access
ESA CCI gridded sea level data[3] A multi-satellite merged time series of monthly gridded Sea Level Anomalies, with a spatial resolution of 0.25 degrees, from year 1993 to 2015.

ESA also present other sea level related datasets.

View; Access
AVISO global mean sea level data[4] Sea level data derived from satellite altimery. Access and View
NASA's sea level change portal[5] NASA provides a comprehensive portal for sea level change, including historical data, satellite observations, and projections. observations; IPCC AR6 projection; Interagency scenarios
NOAA sea level observation[6] Global and local sea level time series based on measurements from satellite radar altimeters since 1992. Access
NOAA sea level trend data Local trends in sea level rise estimated using the same measurements above, i.e. measurements from satellite radar altimeters since 1992 View; Access
Sea level rise viewer by NOAA[7] The data and maps illustrate potential coastal flooding impact areas and relative depth associated with different scales of sea level rise, as well as potential changes in marsh and other land cover types based on inundation levels. It can be used as a screening-level tool for management decisions. View
NOAA’s Coastal Inundation Dashboard[8] It provides near real-time water level information, as well as storm track and intensity forecast, active coastal flood and storm surge watches and warnings. Storm surge inundation datasets are created using the high tide scenario SLOSH MOM products for all regions. View
Sea level analysis tool[9] The web application enables users to visualize observed sea level data, compare observations to projected sea level change, and estimate when tidal and extreme water levels will intersect with elevation thresholds related to local infrastructure (e.g., roads, power generating facilities, dunes). View
NASA's coastal flooding analysis tool[10] High-tide flooding is becoming more common in U.S. coastal areas. NASA's Flooding Analysis Tool was created to help assess how sea-level rise and other factors will impact high-tide flooding frequency. Users can view sea-level observations and past flooding frequency, explore future flooding changes, and access statistics and key inflection points to aid decision-making. View
Sea level rise analysis by Climate Central[11] Climate Central provides a set of mapping tools for accurate, clear and granular information about sea level rise and coastal flood hazards both locally and globally, today and tomorrow. View
FEMA flood hazard and risk viewer These data show predicted sea level rise expected to occur by 2050. This increase can give users a sense of how much coastal flooding might increase over the same time. View
USGS Coastal Change Hazards Portal[12] This portal provides a comprehensive collection of data related to coastal hazards, including the probability of long-term shoreline change due to sea-level rise. This probability is calculated using information about rates of relative sea-level rise, wave height, tidal range, coastal geomorphology, coastal slope, and historical rate of shoreline change. Coastal vulnerability index to this change is also giving. View
Digital shoreline analysis system by USGS[13] The Digital Shoreline Analysis System (DSAS) calculates shoreline or boundary change over time. It enables a user to calculate rate-of-change statistics from multiple historical shoreline positions. It provides an automated method for establishing measurement transects, performs rate calculations, and provides uncertainties associated with rates of change.

Many local shoreline data can also be found on USGS's data portal.

Access

References

  1. ↑ 1.0 1.1 Lindsey, R. (2022, April 19). Climate change: Global sea level. NOAA Climate.gov. https://www.climate.gov/news-features/understanding-climate/climate-change-global-sea-level
  2. ↑ 2.0 2.1 Oppenheimer, M., B.C. Glavovic , J. Hinkel, R. van de Wal, A.K. Magnan, A. Abd-Elgawad, R. Cai, M. Cifuentes-Jara, R.M. DeConto, T. Ghosh, J. Hay, F. Isla, B. Marzeion, B. Meyssignac, and Z. Sebesvari, 2019: Sea Level Rise and Implications for Low-Lying Islands, Coasts and Communities. In: IPCC Special Report on the Ocean and Cryosphere in a Changing Climate [H.-O. Pörtner, D.C. Roberts, V. Masson-Delmotte, P. Zhai, M. Tignor, E. Poloczanska, K. Mintenbeck, A. Alegría, M. Nicolai, A. Okem, J. Petzold, B. Rama, N.M. Weyer (eds.)]. Cambridge University Press, Cambridge, UK and New York, NY, USA, pp. 321-445. https://doi.org/10.1017/9781009157964.006.
  3. ↑ Ablain, M., Cazenave, A., Larnicol, G., Balmaseda, M., Cipollini, P., Faugère, Y., Fernandes, M. J., Henry, O., Johannessen, J. A., Knudsen, P., Andersen, O., Legeais, J., Meyssignac, B., Picot, N., Roca, M., Rudenko, S., Scharffenberg, M. G., Stammer, D., Timms, G., and Benveniste, J.: Improved sea level record over the satellite altimetry era (1993–2010) from the Climate Change Initiative project, Ocean Sci., 11, 67-82, doi:10.5194/os-11-67-2015, 2015.
  4. ↑ https://www.aviso.altimetry.fr/en/data/products/ocean-indicators-products/mean-sea-level.html
  5. ↑ https://sealevel.nasa.gov/
  6. ↑ https://www.star.nesdis.noaa.gov/socd/lsa/SeaLevelRise/index.php
  7. ↑ https://coast.noaa.gov/digitalcoast/tools/slr.html
  8. ↑ https://oceanservice.noaa.gov/facts/storm-dashboard.html
  9. ↑ https://climate.sec.usace.army.mil/slat/technicaldocumentation/
  10. ↑ https://sealevel.nasa.gov/data_tools/15/
  11. ↑ https://sealevel.climatecentral.org/maps/
  12. ↑ https://www.climateriskwiki.uw.edu/index.php?title=Storm_Surges#cite_note-7
  13. ↑ Himmelstoss, E.A., Henderson, R.E., Farris, A.S., Kratzmann, M.G., Bartlett, M.K., Ergul, A., McAndrews, J., Cibaj, R., Zichichi, J.L., and Thieler, E.R., 2024, Digital Shoreline Analysis System version 6.0: U.S. Geological Survey software release, https://doi.org/10.5066/P13WIZ8M.
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