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Sea Level Changes: Observations vs. IPCC Models

This article presents observational facts on sea level changes, contrasting them with predictions from IPCC models. It discusses the limitations of rapid sea level rise and provides evidence from various locations such as the Maldives, Bangladesh, Tuvalu, Vanuatu, Venice, and northwest Europe.

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Sea Level Changes: Observations vs. IPCC Models

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  1. Havets nåvåförändringarobservationsfakta mot IPCC-modeller Nils-Axel Mörner Paleogeophysics & Geodynamics, Stockholm, Sweden morner@pog.nu President INQUA Com.on Sea Level Changes and Coastal Evolution (1999-2003) Leader of the Maldives Sea Level Project (2000-2009+) Co-ordinator INTAS project on Geomagnetism and Climate (1997-2003) The Golden Condrite of Merit, 2008, Algarve University: “for his contribution to our understanding of sea level change”

  2. Förändringar har Fördelar och Nackdelar • det gäller i högsta grad för Global Warming • Men inget gott kan komma från en snabb stigning av havsytan • Därför ar detta • Det enda Verkliga Hotet • Fast i sanning, Så Helt Fel ! • quod erat demonstrandum

  3. Det är det här det handlar om Observationsfakta eller Modeldata

  4. 1. maximal isavsmältning och global sea level

  5. De glaciärer som finns idag kan aldrig smälta fortare än istidens enorma ismassor Smältningen av istidens glaciärer tog 10,000 år Och havsytan steg då med 10 mm/år (1 m/100 år) Vilket sätter en yttersta gräns för en möjlig havsytestigning idag

  6. The rate of glacial eustatic rise after LGM was ~10 mm/yr and sets the ultimate limit of possible sea level changes in the present century (yellow).

  7. IPCC is coming down with time ! COMPARE: Mörner, 1991 ~0.0 Mörner, 1996 <+10 cm INQUA, 2000 +10 ±10 cm Mörner, 2004 +5 ±15 cm Mörner, 2010 +5–7 ±10 cm

  8. 2. Thermal Expansion

  9. 3. Sea Level Changes

  10. OBSERVATIONAL FACTS Numerous interacting factors control the stability of the shoreline

  11. The combined observational records (in mm/year) for the last 300 years. It shows variations – ups and downs – but no trend. For year 2100, INQUA gives predictions in line with this record, whilst the IPCC scenarios lie far above – way off – observational data

  12. 4. Nature’s own observational records

  13. 5. The Maldives Dömd att översvämmas om 50-100 år

  14. The new sea level curve of the Maldivesrecording a seven oscillations driven by the redistribution of ocean water masses (from Mörner, 2007)

  15. Fen-to-lake records on the island of Goidhoo ~1970 1790 ~1700

  16. Queen’s Bath (4) +0.6 m ~400 BP (3) +20-30 cm >1970 (2) Present HTL (1) Present MTL

  17. At ~1970 Sea Level fell some 20 cm Causing erosion with sand deposition outward, downward Leaving an old fossil shore and an old overgrewing surface of grey weathered corals. The present shore has remained stable for ~30 years The two laked on Goudhoo dried up

  18. Shore on map from 1922 Platform >1970 Platform >1970 Fall ~1970 Platform <1970

  19. Sea level changes in the Maldives from 1500 to 2009 and 2100 No reasons for any alarm. Sea level has been stable for the last 30 years. Maximum future change may be a return to a pre-1970 level

  20. Cabinet under water President in water Past-Present-Future sea level changes no threat at all !

  21. 6. Bangladesh an area cursed by repeated flooding and doomed to experience terrible flooding disasters in the near future

  22. Coastal Erosion ! Sea is Rising ! The IPCCers say

  23. kusterosion – ja men – ingen havsytestigning vilket klart framgår av trädens rötter som sprider sig horisontellt på precis samma nivå som i skogen bakom

  24. The original clay surface was just above the horizontal roots

  25. The wreck is stranded at HTL with a storm beach behind. This suggests a slight lowering with respect to the delta surface

  26. Sea Level Changes in Bangladesh There is no global sea level rise in Bangladesh

  27. INDIA BANGLADESH MALDIVES

  28. 7. Tuvalu and Vanuatu Both island-groups claimed already to be in the process of becoming flooded

  29. Tuvalu – tide gauge record 8 years of slow rise (installation subsidence?) is followed by 22 years of stability – i.e. no sea level rise the 3 low levels represent ENSO-events

  30. The Vanuatu News Port Vila Press Online, December 2005 declaired that ”a small community living on Vanuatu has had to be formally moved out of harms” as an effect of the proposed sea level rise and flooding concept. Vanuatu, another notorious site of ”flooding”, shows, in fact, no sign of any ongoing sea level rise

  31. 8 Venice - a good test site Located in the slowly subsiding Po delta any sea level rise or acceleration would be easily detected

  32. Venice, built on delta deposits, experiences a long-term subsidence (blue line). Sea level (pink) fluctuated around this line from 1870 to 1970. No eustatic sea level rise is seen, and from 1970 there even is a sea level lowering recorded

  33. 9. North-west Europe land subsidence long the North Sea coasts and the periphery of uplift in the Kategatt Sea

  34. Korsör Coxhaven Amsterdam

  35. Eustatic curve 1680-1970 (för NW Europa)

  36. From 1840 t0 1940 sea level rose by 11 cm – blue line the Earth’s rate of rotation (LOD) ≈ 10 cm– green line

  37. COXAHVEN 160 YEARS TIDE-GAUGE RECORD A mean-sinosidal relative sea level rise is composed of a long-term subsidence (red) of ~1.4 mm/year and a sinosoidal eustatic rise up to 1960 followed by a slight lowering

  38. Korsör ligger på nollpunkten för landhöjningen undersenaste 8000 åren. Här skulle sann eustasy råda(that is, if the instrument is stably located, which is not at all certain) Vad ser vi? antingen 7,5 cm stigning 1895-2005 (svart linje) eller en segmenterad utan trend (red) ingem acceleration I sent tid (snarare motsatsen)

  39. 10. Satellite Altimetry A wonderful new tool to measure the ocean level but from where does the tilt come?

  40. In 2000 Satellite altimetry – after all physical corrections – showed NO rising trend Just a variability around a zero level (blue) + a major ENSO event (yellow). This data set was presented on the TOPEX/POSEIDON web-page, in their publications, and used by me in my paper in Global and Planetary Changes, vol. 40, 2004, p. 49-54

  41. In 2003 a totally new record appeared Now there was a trend of 2.3 mm/year. This trend is inferrend – not measured

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