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Sea level

This marker indicating sea level is situated between Jerusalem and the Dead Sea.

Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead a long-term average of tide gauge readings at a particular reference location.[1]

Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. Current sea level rise is mainly caused by human-induced climate change.[2] When temperatures rise, mountain glaciers and polar ice sheets melt, increasing the amount of water in the oceans, while the existing seawater also expands with heat. Because most of human settlement and infrastructure was built in response to a more-normalized sea level with limited expected change, populations affected by sea level rise will need to invest in climate adaptation to mitigate the worst effects or, when populations are at extreme risk, a process of managed retreat.[3]

The term above sea level generally refers to the height above mean sea level (AMSL). The term APSL means above present sea level, comparing sea levels in the past with the level today.

Earth's radius at sea level is 6,378.137 km (3,963.191 mi) at the equator. It is 6,356.752 km (3,949.903 mi) at the poles and 6,371.001 km (3,958.756 mi) on average.[4] This flattened spheroid, combined with local gravity anomalies, defines the geoid of the Earth, which approximates the local mean sea level for locations in the open ocean. The geoid includes a significant depression in the Indian Ocean, whose surface dips as much as 106 m (348 ft) below the global mean sea level (excluding minor effects such as tides and currents).[5]

Measurement

Sea level measurements from 23 long tide gauge records in geologically stable environments show a rise of around 200 millimetres (7.9 in) during the 20th century (2 mm/year).

Precise determination of a "mean sea level" is difficult because of the many factors that affect sea level.[6] 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.[7]

Still-water level or still-water sea level (SWL) is the level of the sea with motions such as wind waves averaged out.[8] 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.[9] 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 datum[10] 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.[11] 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

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.[5] 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

Sea level sign seen on cliff (circled in red) at Badwater Basin, Death Valley National Park

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

Local and eustatic

Water cycles between ocean, atmosphere and glaciers

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

The Last Glacial Period caused a much lower global sea level.
Warming temperatures and melting glaciers are currently raising the sea level.

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 tides 12–24 h P 0.1–10+ m
Long-period tides 2-week to 1-year P <0.1 m
Pole tides (Chandler wobble) 14-month P 5 mm
Meteorological and oceanographic fluctuations
Atmospheric pressure Hours to months −0.7 to 1.3 m
Winds (storm surges) 1–5 days Up 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 weeks Up to 1 m
El Niño/southern oscillation 6 mo every 5–10 yr Up to 0.6 m
Seasonal variations
Seasonal water balance among oceans (Atlantic, Pacific, Indian) 6 months  
Seasonal variations in slope of water surface 6 months  
River runoff/floods 2 months 1 m
Seasonal water density changes (temperature and salinity) 6 months 0.2 m
Seiches
Seiches (standing waves) Minutes to hours Up to 2 m
Earthquakes
Tsunamis (catastrophic long-period waves) Hours 0.1–10+ m
Abrupt change in land level Minutes Up to 10 m

Recent changes

Between 1901 and 2018, average global sea level rose by 15–25 cm (6–10 in), with an increase of 2.3 mm (0.091 in) per year since the 1970.[18]: 1216  This is faster than it has rose over the past 3,000 years, if not longer.[18]: 1216  The rate accelerated to 4.62 mm (0.182 in)/yr for the decade 2013–2022.[19] Climate change due to human activities is the main cause.[20]: 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.[21]: 1576 

Sea level rise lags behind changes in the Earth's temperature, and sea level rise will therefore continue to accelerate between now and 2050 in response to warming that has already happened.[22] What happens after that depends on human greenhouse gas emissions. Sea level rise would slow between 2050 and 2100 if there are very deep cuts in emissions. It could then reach slightly over 30 cm (1 ft) from now by 2100. With high emissions it would accelerate. It could rise by 1.01 m (3+13 ft) or even 1.6 m (5+13 ft) by then.[20][18]: 1302  In the long run, sea level rise would amount to 2–3 m (7–10 ft) over the next 2000 years if warming amounts to 1.5 °C (2.7 °F). It would be 19–22 metres (62–72 ft) if warming peaks at 5 °C (9.0 °F).[20]: 21 

Rising seas affect every coastal and island population on Earth.[23][24] This can be through flooding, higher storm surges, king tides, and 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.[25][26][27] 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.[28] Areas not directly exposed to rising sea levels could be vulnerable to large-scale migration and economic disruption.

Local factors like tidal range or land subsidence will greatly affect the severity of impacts. There is also the varying resilience and adaptive capacity of ecosystems and countries which will result in more or less pronounced impacts.[29] For instance, sea level rise in the United States (particularly along the US East Coast) is likely to be 2 to 3 times greater than the global average by the end of the century.[30][31] Yet, of the 20 countries with the greatest exposure to sea level rise, 12 are in Asia, including Indonesia, Bangladesh and the Philippines.[32] The greatest impact on human populations in the near term will occur in the low-lying Caribbean and Pacific islands. Sea level rise will make many of them uninhabitable later this century.[33]

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 seawalls[34] 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.[35] A managed retreat strategy is difficult if an area's population is increasing rapidly. This is a particularly acute problem for Africa.[36] Poorer nations may also struggle to implement the same approaches to adapt to sea level rise as richer states. Sea level rise at some locations may be compounded by other environmental issues. One example is subsidence in sinking cities.[37] Coastal ecosystems typically adapt to rising sea levels by moving inland. Natural or artificial barriers may make that impossible.[38]

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

References

  1. ^ What is "Mean Sea Level"? Liverpool, UK: National Oceanography Centre. Retrieved 29 January 2024.
  2. ^ USGCRP (2017). "Climate Science Special Report. Chapter 12: Sea Level Rise. Key finding 1". science2017.globalchange.gov: 1–470. Archived from the original on 8 December 2019. Retrieved 27 December 2018.
  3. ^ Nicholls, Robert J.; Marinova, Natasha; Lowe, Jason A.; Brown, Sally; Vellinga, Pier; Gusmão, Diogo de; Hinkel, Jochen; Tol, Richard S. J. (2011). "Sea-level rise and its possible impacts given a 'beyond 4°C (39.2°F)world' in the twenty-first century". Philosophical Transactions of the Royal Society of London A: Mathematical, Physical and Engineering Sciences. 369 (1934): 161–181. Bibcode:2011RSPTA.369..161N. doi:10.1098/rsta.2010.0291. ISSN 1364-503X. PMID 21115518. S2CID 8238425.
  4. ^ "Earth Radius by Latitude Calculator". Archived from the original on 15 August 2021. Retrieved 22 August 2021.
  5. ^ a b 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.
  6. ^ US National Research Council, Bulletin of the National Research Council 1932 page 270
  7. ^ a b 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.
  8. ^ "Still-water level - AMS Glossary". glossary.ametsoc.org. Archived from the original on 10 December 2018. Retrieved 10 December 2018.
  9. ^ "Ordnance Survey Benchmark locator". Archived from the original on 27 December 2021. Retrieved 21 December 2021.
  10. ^ "Tide: Notes", Hong Kong Observatory. Archived 27 September 2022 at the Wayback Machine.
  11. ^ 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.
  12. ^ "Sea Level 101: What Determines the Level of the Sea?". NASA. 3 June 2020. Retrieved 17 April 2024.
  13. ^ Jackson, Julia A., ed. (1997). "Relative rise in sea level". Glossary of geology (4th ed.). Alexandria, Virginia: American Geological Institute. ISBN 0922152349.
  14. ^ Jackson, Julia A., ed. (1997). "Eustatic". Glossary of geology (4th ed.). Alexandria, Virginia: American Geological Institute. ISBN 0922152349.
  15. ^ Jackson, Julia A., ed. (1997). "Steric". Glossary of geology (4th ed.). Alexandria, Virginia: American Geological Institute. ISBN 0922152349.
  16. ^ "Eustatic sea level". Oilfield Glossary. Schlumberger Limited. Archived from the original on 2 November 2011. Retrieved 10 June 2011.
  17. ^ "Global Warming Effects on Sea Level". www.climatehotmap.org. Archived from the original on 20 November 2016. Retrieved 2 December 2016.
  18. ^ a b c 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, New York, US.
  19. ^ "WMO annual report highlights continuous advance of climate change". World Meteorological Organization. 21 April 2023. Press Release Number: 21042023.
  20. ^ a b c IPCC, 2021: Summary for Policymakers. 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 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, United Kingdom and New York, New York, US, pp. 3−32, doi:10.1017/9781009157896.001.
  21. ^ 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. 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.
  22. ^ 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. Box SYN-1: Sustained warming could lead to severe impacts
  23. ^ McMichael, Celia; Dasgupta, Shouro; Ayeb-Karlsson, Sonja; Kelman, Ilan (27 November 2020). "A review of estimating population exposure to sea-level rise and the relevance for migration". Environmental Research Letters. 15 (12): 123005. Bibcode:2020ERL....15l3005M. doi:10.1088/1748-9326/abb398. ISSN 1748-9326. PMC 8208600. PMID 34149864.
  24. ^ 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.
  25. ^ TAR Climate Change 2001: The Scientific Basis (PDF) (Report). International Panel on Climate Change, Cambridge University Press. 2001. ISBN 0521-80767-0. Retrieved 23 July 2021.
  26. ^ "Sea level to increase risk of deadly tsunamis". United Press International. 2018.
  27. ^ Holder, Josh; Kommenda, Niko; Watts, Jonathan (3 November 2017). "The three-degree world: cities that will be drowned by global warming". The Guardian. Retrieved 28 December 2018.
  28. ^ 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.
  29. ^ 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.
  30. ^ 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.
  31. ^ "2022 Sea Level Rise Technical Report". oceanservice.noaa.gov. Retrieved 4 July 2022.
  32. ^ 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. In Climate Change 2022: Impacts, Adaptation and Vulnerability [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, United Kingdom and New York, New York, US, pp. 1457–1579 |doi=10.1017/9781009325844.012.
  33. ^ 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. In Climate Change 2022: Impacts, Adaptation and Vulnerability [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, United Kingdom and New York, New York, US, pp. 2043–2121 |doi=10.1017/9781009325844.017.
  34. ^ "IPCC's New Estimates for Increased Sea-Level Rise". Yale University Press. 2013.
  35. ^ 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. JSTOR 26269087.
  36. ^ Trisos, C. H., I. O. Adelekan, E. Totin, A. Ayanlade, J. Efitre, A. Gemeda, K. Kalaba, C. Lennard, C. Masao, Y. Mgaya, G. Ngaruiya, D. Olago, N. P. Simpson, and S. Zakieldeen 2022: Chapter 9: Africa. In Climate Change 2022: Impacts, Adaptation and Vulnerability [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, United Kingdom and New York, New York, US, pp. 2043–2121 |doi=10.1017/9781009325844.011.
  37. ^ Nicholls, Robert J.; Marinova, Natasha; Lowe, Jason A.; Brown, Sally; Vellinga, Pier; Gusmão, Diogo de; Hinkel, Jochen; Tol, Richard S. J. (2011). "Sea-level rise and its possible impacts given a 'beyond 4°C (39.2°F)world' in the twenty-first century". Philosophical Transactions of the Royal Society of London A: Mathematical, Physical and Engineering Sciences. 369 (1934): 161–181. Bibcode:2011RSPTA.369..161N. doi:10.1098/rsta.2010.0291. ISSN 1364-503X. PMID 21115518. S2CID 8238425.
  38. ^ "Sea level rise poses a major threat to coastal ecosystems and the biota they support". birdlife.org. Birdlife International. 2015.
  39. ^ US Federal Aviation Administration, Code of Federal Regulations Sec. 91.121 Archived 26 April 2009 at the Wayback Machine

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Voce principale: Wikipedia. Wikipedia è un'enciclopedia online a contenuto libero nata il 15 gennaio 2001. Tra i suoi principi essenziali figurano il punto di vista neutrale[1] e il rispetto del copyright[2]. La pagina principale di Wikipedia il 28 settembre 2002 Jimmy Wales, fondatore di Wikipedia e della Wikimedia Foundation Larry Sanger, caporedattore di Nupedia e cofondatore di Wikipedia Indice 1 Storia 1.1 Nupedia 1.2 Wikipedia.com 1.3 Wikipedia.org e la Enciclopedia Libre …

Artikel ini sebatang kara, artinya tidak ada artikel lain yang memiliki pranala balik ke halaman ini.Bantulah menambah pranala ke artikel ini dari artikel yang berhubungan atau coba peralatan pencari pranala.Tag ini diberikan pada Desember 2022. Artikel ini sebatang kara, artinya tidak ada artikel lain yang memiliki pranala balik ke halaman ini.Bantulah menambah pranala ke artikel ini dari artikel yang berhubungan atau coba peralatan pencari pranala.Tag ini diberikan pada Oktober 2022. Maarten B…

Vijender SinghVijender di penghargaan SaharaStatistikNama asliVijender Singh BeniwalDinilai padaSuper-middleweightTinggi6 kaki 0 inKebangsaanIndiaLahir29 Oktober 1985 (umur 38)Desa Kaluwas, distrik Bhiwani, Haryana, IndiaCatatan tinjuTotal perkelahian7Menang7Menang oleh KO6Kalah0 Rekam medali Tinju amatir putra Mewakili  India Permainan Olimpiade 2008 Beijing Middleweight Kejuaraan Dunia 2009 Milan Middleweight Commonwealth Games 2006 Melbourne Welterweight 2014 Glasgow Middleweight 20…

Ganggang hijau Alga hijau adalah kelompok alga berdasarkan zat warna atau pigmentasinya. Alga hijau memiliki anggota sekitar 7.000 spesies.[1] Alga hijau juga merupakan alga uniseluler maupun multiseluler yang memiliki klorofil yang dominan yang membuat alga berwarna hijau.[2] Dalam taksonomi, semula semua alga yang tampak berwarna hijau dimasukkan sebagai salah satu kelas dalam filum/divisio Thallophyta, yaitu Chlorophyceae. Pengelompokan ini sekarang dianggap tidak valid karena…

Es

Untuk Einstenium (Es), lihat Einsteinium. Gunung es yang timbul akibat air yang membeku Es sungai Es laut Es (Belanda: ijscode: nl is deprecated ) adalah air yang dibekukan menjadi bentuk padat.[1][2] Bergantung pada adanya kotoran seperti partikel tanah atau gelembung udara, dapat terlihat transparan atau warna kebiru-biruan yang kurang lebih buram. Pembekuan ini umumnya terjadi bila air didinginkan di bawah suhu 0 °C (273.15 K, 32 °F) pada tekanan atmosfer stan…

 Nota: Não confundir com São João da Mata (Minas Gerais). Mata de São João   Município do Brasil   Barcos na vila de pescadores da Praia do ForteBarcos na vila de pescadores da Praia do Forte Símbolos Bandeira Brasão de armas Hino Lema A civitate melius et melius, Uma cidade cada vez melhor Gentílico matense Localização Localização de Mata de São João na BahiaLocalização de Mata de São João na Bahia Mata de São JoãoLocalização de Mata de São …

Elise TestoneLahir29 Juli 1983 (umur 40)Kinnelon, New Jersey, Amerika SerikatGenreBlues,[1] rock,[1] soul[1]PekerjaanPenyanyiInstrumenVokal, piano, gitar, drumTahun aktif2005-sekarang Elise Testone (lahir 29 Juli 1983) adalah penyanyi yang berasal dari Mount Pleasant, South Carolina. Ia merupakan salah satu finalis American Idol musim kesebelas. Kehidupan awal Testone lahir pada tanggal 29 Juli 1983, dari pasangan LuAnne dan Victor Testone.[2][3] Refe…

Artikel ini sebatang kara, artinya tidak ada artikel lain yang memiliki pranala balik ke halaman ini.Bantulah menambah pranala ke artikel ini dari artikel yang berhubungan atau coba peralatan pencari pranala.Tag ini diberikan pada November 2022. Senator Pettus beralih ke halaman ini. Untuk kegunaan lain, lihat Senator Pettus (disambiguasi). Edmund Pettus Senator Amerika Serikat dari AlabamaMasa jabatan4 Maret 1897 – 27 Juli 1907 PendahuluJames L. PughPenggantiJoseph F. Johnston Inform…

Halaman ini berisi artikel tentang demografi agama di Republik India. Untuk agama yang berasal dari anak benua India, lihat agama India. Untuk buku, lihat The Religion of India: The Sociology of Hinduism and Buddhism. Patung batu Saraswati (dewi seni rupa dan musik Hindu) di Candi Gangaikonda Cholapuram, Tamil Nadu; sebuah Situs Warisan Dunia UNESCO. Bagian dari seri tentangBudaya India Sejarah Bangsa Bahasa Assam Bengali Bodo Dogri Gujarati Kannada Kashmiri Konkani Maithili Malayalam Manipuri M…

Carlos Delfino PosisiShooting guardSmall forward LigaNBATinggi6 ft 6 in (1,98 m) Berat230 lb (105 kg)KlubDetroit PistonsNegara  ArgentinaLahir29 Agustus, 1982Santa Fe, ArgentinaDraftke-29, 2004 Detroit PistonsKarier pro2004 – sekarang Carlos Francisco Delfino (lahir di Santa Fe, Argentina pada 29 Agustus, 1982) adalah pemain bola basket Argentina yang bermain untuk klub Detroit Pistons dan umumnya bermain di posisi shooting guard dan small forward. Ia bertingg…

2018 soundtrack album by Michael GiacchinoIncredibles 2 (Original Motion Picture Soundtrack)Soundtrack album by Michael GiacchinoReleasedJune 15, 2018Recorded2017–2018GenreFilm soundtrackLength1:14:50LabelWalt DisneyProducerMichael GiacchinoPixar soundtrack chronology Coco(2017) Incredibles 2(2018) Toy Story 4(2019) Michael Giacchino chronology Coco(2017) Incredibles 2(2018) Jurassic World: Fallen Kingdom(2018) Incredibles 2 (Original Motion Picture Soundtrack) is the soundtrack album …

Daddy You, Daughter MeNama lainHangul아빠는 딸 Alih Aksara yang DisempurnakanAbbaneun Ddal SutradaraKim Hyeong-hyeopProduserKim Yoon-sukJeong Yu-dongSkenarioChoi Yoon-miKim Ji-sunJin Na-riJo Sung-wooBerdasarkanPapa to Musume no Nanokakanoleh Takahisa IgarashiPemeranYoon Je-moonJung So-minSinematograferJeong Gi-wonJang Nam-cheolPenyuntingMoon In-daePerusahaanproduksiA Kimchi Movie ProductionDistributorMegabox Plus MTanggal rilis 12 April 2017 (2017-04-12) Durasi115 menitNegaraKorea…

AlaapSutradaraHrishikesh MukherjeeProduserHrishikesh MukherjeeN. C. SippyRomu N. SippyDitulis olehRahi Masoom Raza,Biren Tripathy,Jehan Nayyar (Dialogue)SkenarioBimal DuttaCeritaHrishikesh MukherjeePemeranAmitabh BachchanRekhaAsraniFarida JalalOm PrakashPenata musikJaidevRahi Masoom Raza (Lirik)SinematograferJaywant PatharePenyuntingKhan Zaman KhanDistributorRupam ChitraTanggal rilis1977 (1977)Durasi161 menitNegaraIndiaBahasaHindiAnggaran₹ Alaap adalah sebuah film India 1977 yang di…

Keju krimSumber sususapiTeksturlembutWaktu pematangantidakSertifikasitidak ada Keju krim adalah keju lembut bagaikan mentega, berwarna putih dengan rasa sedikit gurih. Keju krim dibuat dari susu sapi dengan kandungan lemak susu paling sedikit 33% dengan kadar air tidak lebih dari 55%, dan memiliki pH antara 4,4 sampai 4,9.[1] Keju krim biasanya dijual dalam kemasan berbentuk persegi empat seperti keju cheddar atau kemasan tube. Beberapa merek menambahkan perasa seperti bawang putih, dill…

Cerpelai gunung jawa Status konservasi Risiko Rendah (IUCN 3.1)[1] Klasifikasi ilmiah Domain: Eukaryota Kerajaan: Animalia Filum: Chordata Kelas: Mammalia Ordo: Carnivora Famili: Mustelidae Genus: Mustela Spesies: Mustela lutreolinaRobinson & Thomas, 1917 Peta persebaran Cerpelai gunung Jawa (Mustela lutreolina) adalah spesies cerpelai yang hidup di pulau Jawa dan Sumatera di Indonesia pada ketinggian lebih dari 1,000 meter (3 ft 3,4 in). Mereka tinggal di daerah pegun…

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