Sea level variations

For 15,000 Years the seas level rose by more than 100 meters.

Blanchon, P., & Shaw, J., 1995: Reef drowning during the last glaciation: evidence for catastrophic sea-level rise and ice sheet collapse. Geology, 23:4-8. Fairbanks, R.G., 1989: A 17,000-year glacio-eustatic sea level record: influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation. Nature, 342:637-642

The Würm de-freezing trend is not yet arrived at his very end as it seems that the climate still continues to change by successive oscillations.

The seas rising average speed since the end of the Würm and until today has been averaged as 0.66 meter per century!

Currently scientific measurement indicates: 0, 20 meter per century as an average speed for the 20th century (Centre National Recherches Scientifiques).

The Mediterranean Paleo-shore level observation indicates successive steps in the water speed rises (see graphic below):

-7 m    >> 4,000 years ago, average speed until today: 0.18 meter per century
-25 m   >> 5 800 years ago, average speed until today: 0.43 meter per century.

Note the speed between -5800 and-4000: 1 meter per century!

-36 m  >> 7,000 years ago - level of the submerged entrance of the Paleolithic Cosquer cave (see below) - averaged speed since this date: 0,51 meter per century.

Note:
The current averaged speed rise of 0,18meter per century -during the 20th century - is similar to those of the past 4000 years.

Tide gauges:

The sea rising water levels were recorded by tide gauges all  along the continents coasts: The tide gages recorded  a rate of 1.8 mm per year corresponds to what is generally observed: 0,18meter for the 20th century, with no detectable acceleration of the water rise!

The great advantage of tide gages is that they give the real situation of water variation at the very place where sea rise may impacts. The tide gage informs you that the sea level increases with fluctuation from time to time.

Satellites:

The University of Colorado who analyze the satellite data (Topex, Poseidon) provided information that shown since 2001 an average sea level rise of 0.19 meter per century.
This value corresponds to:

• The average value of the 20 th centurys
• The average value of last 4,000 years

The recod here below shows that locally the sea rise can show currently a rate as low as 0,11 meter per century

Up to the year 2003 the scientific community believed in the actual temperature recorded directly in the sea to calculate the average sea level change...But now, this method shows a decrease of sea level, then...( Ishii and al , 2006) ... this is no more in line with the dominant speech!

CONCLUSION:

There was no faster average sea level rise during whole the 20th century and even during the last decade of 20 th century ... when the atmospheric CO2 content was increasing regularly!

Continue