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Sea level
Geographical reference point

Mean sea level (MSL) is the average level of Earth's coastal bodies of water, serving as a crucial vertical datum used in cartography, marine navigation, and aviation for calibrating altitude based on standard sea level. It is often determined from long-term tide gauge readings at reference locations. Heights measured relative to MSL are called height above mean sea level (AMSL). Earth's shape at sea level defines a flattened spheroid, with the geoid—influenced by gravity anomalies—approximating local MSL, including features like the Indian Ocean geoid depression, which lies up to 106 m below global mean sea level.

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Measurement

Precise determination of a "mean sea level" is difficult because of the many factors that affect sea level.4 Instantaneous sea level varies substantially on several scales of time and space. This is because the sea is in constant motion, affected by the tides, wind, atmospheric pressure, local gravitational differences, temperature, salinity, and so forth. The mean sea level at a particular location may be calculated over an extended time period and used as a datum. For example, hourly measurements may be averaged over a full Metonic 19-year lunar cycle to determine the mean sea level at an official tide gauge.5

Still-water level or still-water sea level (SWL) is the level of the sea with motions such as wind waves averaged out.6 Then MSL implies the SWL further averaged over a period of time such that changes due to, e.g., the tides, also have zero mean. Global MSL refers to a spatial average over the entire ocean area, typically using large sets of tide gauges and/or satellite measurements.7

One often measures the values of MSL with respect to the land; hence a change in relative MSL or (relative sea level) can result from a real change in sea level, or from a change in the height of the land on which the tide gauge operates, or both. In the UK, the ordnance datum (the 0 metres height on UK maps) is the mean sea level measured at Newlyn in Cornwall between 1915 and 1921.8 Before 1921, the vertical datum was MSL at the Victoria Dock, Liverpool. Since the times of the Russian Empire, in Russia and its other former parts, now independent states, the sea level is measured from the zero level of Kronstadt Sea-Gauge. In Hong Kong, "mPD" is a surveying term meaning "metres above Principal Datum" and refers to height of 0.146 m (5.7 in) above chart datum9 and 1.304 m (4 ft 3.3 in) below the average sea level. In France, the Marégraphe in Marseilles measures continuously the sea level since 1883 and offers the longest collated data about the sea level. It is used for a part of continental Europe and the main part of Africa as the official sea level. Spain uses the reference to measure heights below or above sea level at Alicante, while the European Vertical Reference System is calibrated to the Amsterdam Peil elevation, which dates back to the 1690s.

Satellite altimeters have been making precise measurements of sea level since the launch of TOPEX/Poseidon in 1992.10 A joint mission of NASA and CNES, TOPEX/Poseidon was followed by Jason-1 in 2001 and the Ocean Surface Topography Mission on the Jason-2 satellite in 2008.

Height above mean sea level

Main article: Height above mean sea level

Height above mean sea level (AMSL) is the elevation (on the ground) or altitude (in the air) of an object, relative to a reference datum for mean sea level (MSL). It is also used in aviation, where some heights are recorded and reported with respect to mean sea level (contrast with flight level), and in the atmospheric sciences, and in land surveying. An alternative is to base height measurements on a reference ellipsoid approximating the entire Earth, which is what systems such as GPS do. In aviation, the reference ellipsoid known as WGS84 is increasingly used to define heights; however, differences up to 100 metres (328 feet) exist between this ellipsoid height and local mean sea level.11 Another alternative is to use a geoid-based vertical datum such as NAVD88 and the global EGM96 (part of WGS84). Details vary in different countries.

When referring to geographic features such as mountains, on a topographic map variations in elevation are shown by contour lines. A mountain's highest point or summit is typically illustrated with the AMSL height in metres, feet or both. In unusual cases where a land location is below sea level, such as Death Valley, California, the elevation AMSL is negative.

Difficulties in use

It is often necessary to compare the local height of the mean sea surface with a "level" reference surface, or geodetic datum, called the geoid. In the absence of external forces, the local mean sea level would coincide with this geoid surface, being an equipotential surface of the Earth's gravitational field which, in itself, does not conform to a simple sphere or ellipsoid and exhibits gravity anomalies such as those measured by NASA's GRACE satellites. In reality, the geoid surface is not directly observed, even as a long-term average, due to ocean currents, air pressure variations, temperature and salinity variations, etc. The location-dependent but time-persistent separation between local mean sea level and the geoid is referred to as (mean) ocean surface topography. It varies globally in a typical range of ±1 m (3 ft).12

Dry land

Several terms are used to describe the changing relationships between sea level and dry land.

  • "relative" means change relative to a fixed point in the sediment pile.13
  • "eustatic" refers to global changes in sea level relative to a fixed point, such as the centre of the earth, for example as a result of melting ice-caps.14
  • "steric" refers to global changes in sea level due to thermal expansion and salinity variations.15
  • "isostatic" refers to changes in the level of the land relative to a fixed point in the earth, possibly due to thermal buoyancy or tectonic effects, disregarding changes in the volume of water in the oceans.

The melting of glaciers at the end of ice ages results in isostatic post-glacial rebound, when land rises after the weight of ice is removed. Conversely, older volcanic islands experience relative sea level rise, due to isostatic subsidence from the weight of cooling volcanos. The subsidence of land due to the withdrawal of groundwater is another isostatic cause of relative sea level rise.

On planets that lack a liquid ocean, planetologists can calculate a "mean altitude" by averaging the heights of all points on the surface. This altitude, sometimes referred to as a "sea level" or zero-level elevation, serves equivalently as a reference for the height of planetary features.

Change

See also: Past sea level and sea level rise

Local and eustatic

See also: Eustatic sea level

Local mean sea level (LMSL) is defined as the height of the sea with respect to a land benchmark, averaged over a period of time long enough that fluctuations caused by waves and tides are smoothed out, typically a year or more. One must adjust perceived changes in LMSL to account for vertical movements of the land, which can occur at rates similar to sea level changes (millimetres per year).

Some land movements occur because of isostatic adjustment to the melting of ice sheets at the end of the last ice age. The weight of the ice sheet depresses the underlying land, and when the ice melts away the land slowly rebounds. Changes in ground-based ice volume also affect local and regional sea levels by the readjustment of the geoid and true polar wander. Atmospheric pressure, ocean currents and local ocean temperature changes can affect LMSL as well.

Eustatic sea level change (global as opposed to local change) is due to change in either the volume of water in the world's oceans or the volume of the oceanic basins.16 Two major mechanisms are currently causing eustatic sea level rise. First, shrinking land ice, such as mountain glaciers and polar ice sheets, is releasing water into the oceans. Second, as ocean temperatures rise, the warmer water expands.17

Short-term and periodic changes

Many factors can produce short-term changes in sea level, typically within a few metres, in timeframes ranging from minutes to months:

Periodic sea level changes
Diurnal and semidiurnal astronomical tides12–24 h P0.1–10+ m
Long-period tides2-week to 1-year P<0.1 m
Pole tides (Chandler wobble)14-month P5 mm
Meteorological and oceanographic fluctuations
Atmospheric pressureHours to months−0.7 to 1.3 m
Winds (storm surges)1–5 daysUp to 5 m
Evaporation and precipitation (may also follow long-term pattern)Days to weeks<0.1m
Ocean surface topography (changes in water density and currents)Days to weeksUp to 1 m
El Niño/southern oscillation6 mo every 5–10 yrUp to 0.6 m
Seasonal variations
Seasonal water balance among oceans (Atlantic, Pacific, Indian)6 months 
Seasonal variations in slope of water surface6 months 
River runoff/floods2 months1 m
Seasonal water density changes (temperature and salinity)6 months0.2 m
Seiches
Seiches (standing waves)Minutes to hoursUp to 2 m
Earthquakes
Tsunamis (catastrophic long-period waves)Hours0.1–10+ m
Abrupt change in land levelMinutesUp to 10 m

Recent changes

Further information: Ocean heat content and Effects of climate change on oceans

This section is an excerpt from Sea level rise.[edit]

Between 1901 and 2018, the average sea level rose by 15–25 cm (6–10 in), with an increase of 2.3 mm (0.091 in) per year since the 1970s.18: 1216  This was faster than the sea level had ever risen over at least the past 3,000 years.19: 1216  The rate accelerated to 4.62 mm (0.182 in)/yr for the decade 2013–2022.20 Climate change due to human activities is the main cause.21: 5, 8  Between 1993 and 2018, melting ice sheets and glaciers accounted for 44% of sea level rise, with another 42% resulting from thermal expansion of water.22: 1576 

Sea level rise lags behind changes in the Earth's temperature by decades, and sea level rise will therefore continue to accelerate between now and 2050 in response to warming that has already happened.23 What happens after that depends on future human greenhouse gas emissions. If there are very deep cuts in emissions, sea level rise would slow between 2050 and 2100. It could then reach by 2100 between 30 cm (1 ft) and 1.0 m (3+1⁄3 ft) from now and approximately 60 cm (2 ft) to 130 cm (4+1⁄2 ft) from the 19th century. With high emissions it would instead accelerate further, and could rise by 50 cm (1.6 ft) or even by 1.9 m (6.2 ft) by 2100.242526: 1302  In the long run, sea level rise would amount to 2–3 m (7–10 ft) over the next 2000 years if warming stays to its current 1.5 °C (2.7 °F) over the pre-industrial past. It would be 19–22 metres (62–72 ft) if warming peaks at 5 °C (9.0 °F).27: 21 

Rising seas affect every coastal population on Earth.28 This can be through flooding, higher storm surges, king tides, and increased vulnerability to tsunamis. There are many knock-on effects. They lead to loss of coastal ecosystems like mangroves. Crop yields may reduce because of increasing salt levels in irrigation water. Damage to ports disrupts sea trade.2930 The sea level rise projected by 2050 will expose places currently inhabited by tens of millions of people to annual flooding. Without a sharp reduction in greenhouse gas emissions, this may increase to hundreds of millions in the latter decades of the century.31

Local factors like tidal range or land subsidence will greatly affect the severity of impacts. For instance, sea level rise in the United States is likely to be two to three times greater than the global average by the end of the century.3233 Yet, of the 20 countries with the greatest exposure to sea level rise, twelve are in Asia, including Indonesia, Bangladesh and the Philippines.34 The resilience and adaptive capacity of ecosystems and countries also varies, which will result in more or less pronounced impacts.35 The greatest impact on human populations in the near term will occur in low-lying Caribbean and Pacific islands including atolls. Sea level rise will make many of them uninhabitable later this century.36

Societies can adapt to sea level rise in multiple ways. Managed retreat, accommodating coastal change, or protecting against sea level rise through hard-construction practices like seawalls37 are hard approaches. There are also soft approaches such as dune rehabilitation and beach nourishment. Sometimes these adaptation strategies go hand in hand. At other times choices must be made among different strategies.38 Poorer nations may also struggle to implement the same approaches to adapt to sea level rise as richer states.

Aviation

Main article: Altitude in aviation

Pilots can estimate height above sea level with an altimeter set to a defined barometric pressure. Generally, the pressure used to set the altimeter is the barometric pressure that would exist at MSL in the region being flown over. This pressure is referred to as either QNH or "altimeter" and is transmitted to the pilot by radio from air traffic control (ATC) or an automatic terminal information service (ATIS). Since the terrain elevation is also referenced to MSL, the pilot can estimate height above ground by subtracting the terrain altitude from the altimeter reading. Aviation charts are divided into boxes and the maximum terrain altitude from MSL in each box is clearly indicated. Once above the transition altitude, the altimeter is set to the international standard atmosphere (ISA) pressure at MSL which is 1013.25 hPa or 29.92 inHg.39

See also

  • Oceans portal
  • World portal
The Wikibook Historical Geology has a page on the topic of: Sea level variations Wikimedia Commons has media related to Sea level.

References

  1. What is "Mean Sea Level"? Liverpool, UK: National Oceanography Centre. Retrieved 29 January 2024. https://psmsl.org/train_and_info/faqs/#1 ↩

  2. "Earth Radius by Latitude Calculator". Archived from the original on 15 August 2021. Retrieved 22 August 2021. https://rechneronline.de/earth-radius/ ↩

  3. Sreejith, K.M.; Rajesh, S.; Majumdar, T.J.; Rao, G. Srinivasa; Radhakrishna, M.; Krishna, K.S.; Rajawat, A.S. (January 2013). "High-resolution residual geoid and gravity anomaly data of the northern Indian Ocean – An input to geological understanding". Journal of Asian Earth Sciences. 62: 616–626. Bibcode:2013JAESc..62..616S. doi:10.1016/j.jseaes.2012.11.010. /wiki/Bibcode_(identifier) ↩

  4. US National Research Council, Bulletin of the National Research Council 1932 page 270 /wiki/National_Research_Council_(United_States) ↩

  5. Gregory, Jonathan M.; Griffies, Stephen M.; Hughes, Chris W.; Lowe, Jason A.; et al. (29 April 2019). "Concepts and Terminology for Sea Level: Mean, Variability and Change, Both Local and Global". Surveys in Geophysics. 40 (6): 1251–1289. Bibcode:2019SGeo...40.1251G. doi:10.1007/s10712-019-09525-z. https://doi.org/10.1007%2Fs10712-019-09525-z ↩

  6. "Still-water level - AMS Glossary". glossary.ametsoc.org. Archived from the original on 10 December 2018. Retrieved 10 December 2018. http://glossary.ametsoc.org/wiki/Still-water_level ↩

  7. Gregory, Jonathan M.; Griffies, Stephen M.; Hughes, Chris W.; Lowe, Jason A.; et al. (29 April 2019). "Concepts and Terminology for Sea Level: Mean, Variability and Change, Both Local and Global". Surveys in Geophysics. 40 (6): 1251–1289. Bibcode:2019SGeo...40.1251G. doi:10.1007/s10712-019-09525-z. https://doi.org/10.1007%2Fs10712-019-09525-z ↩

  8. "Ordnance Survey Benchmark locator". Archived from the original on 27 December 2021. Retrieved 21 December 2021. https://www.ordnancesurvey.co.uk/benchmarks/ ↩

  9. "Tide: Notes", Hong Kong Observatory. Archived 27 September 2022 at the Wayback Machine. https://www.hko.gov.hk/en/tide/enotes.htm ↩

  10. Glazman, Roman E; Greysukh, Alexander; Zlotnicki, Victor (1994). "Evaluating models of sea state bias in satellite altimetry". Journal of Geophysical Research. 99 (C6): 12581. Bibcode:1994JGR....9912581G. doi:10.1029/94JC00478. /wiki/Roman_Glazman ↩

  11. Sreejith, K.M.; Rajesh, S.; Majumdar, T.J.; Rao, G. Srinivasa; Radhakrishna, M.; Krishna, K.S.; Rajawat, A.S. (January 2013). "High-resolution residual geoid and gravity anomaly data of the northern Indian Ocean – An input to geological understanding". Journal of Asian Earth Sciences. 62: 616–626. Bibcode:2013JAESc..62..616S. doi:10.1016/j.jseaes.2012.11.010. /wiki/Bibcode_(identifier) ↩

  12. "Sea Level 101: What Determines the Level of the Sea?". NASA. 3 June 2020. Retrieved 17 April 2024. https://science.nasa.gov/earth/climate-change/sea-level-101-what-determines-the-level-of-the-sea/#h-waves-in-the-bathtub ↩

  13. Jackson, Julia A., ed. (1997). "Relative rise in sea level". Glossary of geology (4th ed.). Alexandria, Virginia: American Geological Institute. ISBN 0922152349. 0922152349 ↩

  14. Jackson, Julia A., ed. (1997). "Eustatic". Glossary of geology (4th ed.). Alexandria, Virginia: American Geological Institute. ISBN 0922152349. 0922152349 ↩

  15. Jackson, Julia A., ed. (1997). "Steric". Glossary of geology (4th ed.). Alexandria, Virginia: American Geological Institute. ISBN 0922152349. 0922152349 ↩

  16. "Eustatic sea level". Oilfield Glossary. Schlumberger Limited. Archived from the original on 2 November 2011. Retrieved 10 June 2011. http://www.glossary.oilfield.slb.com/Display.cfm?Term=eustatic%20sea%20level ↩

  17. "Global Warming Effects on Sea Level". www.climatehotmap.org. Archived from the original on 20 November 2016. Retrieved 2 December 2016. http://www.climatehotmap.org/global-warming-effects/sea-level.html ↩

  18. Fox-Kemper, B.; Hewitt, Helene T.; Xiao, C.; Aðalgeirsdóttir, G.; Drijfhout, S. S.; Edwards, T. L.; Golledge, N. R.; Hemer, M.; Kopp, R. E.; Krinner, G.; Mix, A. (2021). Masson-Delmotte, V.; Zhai, P.; Pirani, A.; Connors, S. L.; Péan, C.; Berger, S.; Caud, N.; Chen, Y.; Goldfarb, L. (eds.). "Chapter 9: Ocean, Cryosphere and Sea Level Change" (PDF). Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK and New York, US. Archived (PDF) from the original on 24 October 2022. Retrieved 18 October 2022. /wiki/Helene_Hewitt ↩

  19. Fox-Kemper, B.; Hewitt, Helene T.; Xiao, C.; Aðalgeirsdóttir, G.; Drijfhout, S. S.; Edwards, T. L.; Golledge, N. R.; Hemer, M.; Kopp, R. E.; Krinner, G.; Mix, A. (2021). Masson-Delmotte, V.; Zhai, P.; Pirani, A.; Connors, S. L.; Péan, C.; Berger, S.; Caud, N.; Chen, Y.; Goldfarb, L. (eds.). "Chapter 9: Ocean, Cryosphere and Sea Level Change" (PDF). Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK and New York, US. Archived (PDF) from the original on 24 October 2022. Retrieved 18 October 2022. /wiki/Helene_Hewitt ↩

  20. "WMO annual report highlights continuous advance of climate change". World Meteorological Organization. 21 April 2023. Archived from the original on 17 December 2023. Retrieved 18 December 2023. Press Release Number: 21042023. https://wmo.int/news/media-centre/wmo-annual-report-highlights-continuous-advance-of-climate-change ↩

  21. IPCC, 2021: Summary for Policymakers Archived 2021-08-11 at the Wayback Machine. In: Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change Archived 2023-05-26 at the Wayback Machine Masson-Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.). Cambridge University Press, Cambridge, UK and New York, US, pp. 3−32, doi:10.1017/9781009157896.001. https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_SPM.pdf ↩

  22. WCRP Global Sea Level Budget Group (2018). "Global sea-level budget 1993–present". Earth System Science Data. 10 (3): 1551–1590. Bibcode:2018ESSD...10.1551W. doi:10.5194/essd-10-1551-2018. hdl:20.500.11850/287786. This corresponds to a mean sea-level rise of about 7.5 cm over the whole altimetry period. More importantly, the GMSL curve shows a net acceleration, estimated to be at 0.08mm/yr2. https://doi.org/10.5194%2Fessd-10-1551-2018 ↩

  23. National Academies of Sciences, Engineering, and Medicine (2011). "Synopsis". Climate Stabilization Targets: Emissions, Concentrations, and Impacts over Decades to Millennia. Washington, DC: The National Academies Press. p. 5. doi:10.17226/12877. ISBN 978-0-309-15176-4. Archived from the original on 30 June 2023. Retrieved 11 April 2022. Box SYN-1: Sustained warming could lead to severe impacts 978-0-309-15176-4 ↩

  24. Grandey, Benjamin S.; Dauwels, Justin; Koh, Zhi Yang; Horton, Benjamin P.; Chew, Lock Yue (2024). "Fusion of Probabilistic Projections of Sea-Level Rise". Earth's Future. 12 (12): e2024EF005295. doi:10.1029/2024EF005295. hdl:10356/181667. ISSN 2328-4277. https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024EF005295 ↩

  25. IPCC, 2021: Summary for Policymakers Archived 2021-08-11 at the Wayback Machine. In: Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change Archived 2023-05-26 at the Wayback Machine Masson-Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.). Cambridge University Press, Cambridge, UK and New York, US, pp. 3−32, doi:10.1017/9781009157896.001. https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_SPM.pdf ↩

  26. Fox-Kemper, B.; Hewitt, Helene T.; Xiao, C.; Aðalgeirsdóttir, G.; Drijfhout, S. S.; Edwards, T. L.; Golledge, N. R.; Hemer, M.; Kopp, R. E.; Krinner, G.; Mix, A. (2021). Masson-Delmotte, V.; Zhai, P.; Pirani, A.; Connors, S. L.; Péan, C.; Berger, S.; Caud, N.; Chen, Y.; Goldfarb, L. (eds.). "Chapter 9: Ocean, Cryosphere and Sea Level Change" (PDF). Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK and New York, US. Archived (PDF) from the original on 24 October 2022. Retrieved 18 October 2022. /wiki/Helene_Hewitt ↩

  27. IPCC, 2021: Summary for Policymakers Archived 2021-08-11 at the Wayback Machine. In: Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change Archived 2023-05-26 at the Wayback Machine Masson-Delmotte, V., P. Zhai, A. Pirani, S.L. Connors, C. Péan, S. Berger, N. Caud, Y. Chen, L. Goldfarb, M. I. Gomis, M. Huang, K. Leitzell, E. Lonnoy, J. B. R. Matthews, T. K. Maycock, T. Waterfield, O. Yelekçi, R. Yu, and B. Zhou (eds.). Cambridge University Press, Cambridge, UK and New York, US, pp. 3−32, doi:10.1017/9781009157896.001. https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_SPM.pdf ↩

  28. Bindoff, N. L.; Willebrand, J.; Artale, V.; Cazenave, A.; Gregory, J.; Gulev, S.; Hanawa, K.; Le Quéré, C.; Levitus, S.; Nojiri, Y.; Shum, C. K.; Talley, L. D.; Unnikrishnan, A. (2007). "Observations: Ocean Climate Change and Sea Level: §5.5.1: Introductory Remarks". In Solomon, S.; Qin, D.; Manning, M.; Chen, Z.; Marquis, M.; Averyt, K. B.; Tignor, M.; Miller, H. L. (eds.). Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press. ISBN 978-0-521-88009-1. Archived from the original on 20 June 2017. Retrieved 25 January 2017. 978-0-521-88009-1 ↩

  29. TAR Climate Change 2001: The Scientific Basis (PDF) (Report). International Panel on Climate Change, Cambridge University Press. 2001. ISBN 0521-80767-0. Archived (PDF) from the original on 5 December 2021. Retrieved 23 July 2021. 0521-80767-0 ↩

  30. Holder, Josh; Kommenda, Niko; Watts, Jonathan (3 November 2017). "The three-degree world: cities that will be drowned by global warming". The Guardian. Archived from the original on 3 January 2020. Retrieved 28 December 2018. https://www.theguardian.com/cities/ng-interactive/2017/nov/03/three-degree-world-cities-drowned-global-warming ↩

  31. Kulp, Scott A.; Strauss, Benjamin H. (29 October 2019). "New elevation data triple estimates of global vulnerability to sea-level rise and coastal flooding". Nature Communications. 10 (1): 4844. Bibcode:2019NatCo..10.4844K. doi:10.1038/s41467-019-12808-z. PMC 6820795. PMID 31664024. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6820795 ↩

  32. Choi, Charles Q. (27 June 2012). "Sea Levels Rising Fast on U.S. East Coast". National Oceanic and Atmospheric Administration. Archived from the original on 4 May 2021. Retrieved 22 October 2022. https://web.archive.org/web/20210504002931/https://www.nationalgeographic.com/science/article/120625-sea-level-rise-east-coast-us-science-nature-climate-change ↩

  33. "2022 Sea Level Rise Technical Report". oceanservice.noaa.gov. Archived from the original on 29 November 2022. Retrieved 4 July 2022. https://oceanservice.noaa.gov/hazards/sealevelrise/sealevelrise-tech-report.html ↩

  34. Shaw, R., Y. Luo, T. S. Cheong, S. Abdul Halim, S. Chaturvedi, M. Hashizume, G. E. Insarov, Y. Ishikawa, M. Jafari, A. Kitoh, J. Pulhin, C. Singh, K. Vasant, and Z. Zhang, 2022: Chapter 10: Asia Archived 2023-04-12 at the Wayback Machine. In Climate Change 2022: Impacts, Adaptation and Vulnerability Archived 2022-02-28 at the Wayback Machine [H.-O. Pörtner, D. C. Roberts, M. Tignor, E. S. Poloczanska, K. Mintenbeck, A. Alegría, M. Craig, S. Langsdorf, S. Löschke, V. Möller, A. Okem, B. Rama (eds.)]. Cambridge University Press, Cambridge, UK and New York, US, pp. 1457–1579. doi:10.1017/9781009325844.012. https://www.ipcc.ch/report/ar6/wg2/downloads/report/IPCC_AR6_WGII_Chapter10.pdf ↩

  35. Mimura, Nobuo (2013). "Sea-level rise caused by climate change and its implications for society". Proceedings of the Japan Academy. Series B, Physical and Biological Sciences. 89 (7): 281–301. Bibcode:2013PJAB...89..281M. doi:10.2183/pjab.89.281. ISSN 0386-2208. PMC 3758961. PMID 23883609. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3758961 ↩

  36. Mycoo, M., M. Wairiu, D. Campbell, V. Duvat, Y. Golbuu, S. Maharaj, J. Nalau, P. Nunn, J. Pinnegar, and O. Warrick, 2022: Chapter 15: Small islands Archived 2023-06-30 at the Wayback Machine. In Climate Change 2022: Impacts, Adaptation and Vulnerability Archived 2022-02-28 at the Wayback Machine [H.-O. Pörtner, D. C. Roberts, M. Tignor, E. S. Poloczanska, K. Mintenbeck, A. Alegría, M. Craig, S. Langsdorf, S. Löschke, V. Möller, A. Okem, B. Rama (eds.)]. Cambridge University Press, Cambridge, UK and New York, US, pp. 2043–2121. doi:10.1017/9781009325844.017. https://www.ipcc.ch/report/ar6/wg2/downloads/report/IPCC_AR6_WGII_Chapter15.pdf ↩

  37. "IPCC's New Estimates for Increased Sea-Level Rise". Yale University Press. 2013. Archived from the original on 28 March 2020. Retrieved 1 September 2015. http://www.yaleclimateconnections.org/2013/10/ipccs-new-estimates-for-increased-sea-level-rise/ ↩

  38. Thomsen, Dana C.; Smith, Timothy F.; Keys, Noni (2012). "Adaptation or Manipulation? Unpacking Climate Change Response Strategies". Ecology and Society. 17 (3). doi:10.5751/es-04953-170320. hdl:10535/8585. JSTOR 26269087. https://doi.org/10.5751%2Fes-04953-170320 ↩

  39. US Federal Aviation Administration, Code of Federal Regulations Sec. 91.121 Archived 26 April 2009 at the Wayback Machine /wiki/Federal_Aviation_Administration ↩