We have about 20,000 years
of sea level data, but there was only one mention of that and no charts.
Satellite observations available since the early 1990s provide more accurate
sea level data with nearly global coverage.
Satellite altimetry observations, available since the early 1990s, provide more
accurate sea level data with nearly global coverage and indicate that since 1993 sea level has been rising at a rate of about 3 millimeters per year.
Josh Willis explanation that extra warming was going down in the deep ocean is unsupportable
because sea level data are essentialy coherent with ARGO ocean temperature: no temperature increase for ARGO (that is the most extensive way we are measuring ocean temperature), no sea level increase.
Global
sea level data shows that sea level rise has been increasing since 1880 while future sea level rise predictions are based on physics, not statistics.
Rahmstorf, Foster, and Cazenave (2012) compares the historical sea level tide gauge data from Church and White (2011) and recent satellite
altimetry sea level data (orange and red in Figure 4, respectively) to the 2001 and 2007 IPCC report model projections (blue and green in Figure 4, respectively).
«In our study we
used sea level data measured by various tide gauges throughout the twentieth century to see how extreme sea level during hurricanes has changed with temperature.»
Whereas most studies look to the last 150 years of instrumental data and compare it to projections for the next few centuries, we looked back 20,000 years using recently collected carbon dioxide, global temperature and
sea level data spanning the last ice age.
Scientists use sea level as a means to calculate ocean circulation because satellites circle Earth daily,
acquiring sea level data frequently and accurately.
In the example below, Lamm
combined sea level data and topographical flood maps to estimate how high medium tide waters would rise in Boston's Back Bay area.
In a second step, we apply the method to reconstructing 2 -
D sea level data over 1950 — 2003, combining sparse tide gauge records available since 1950, with EOF spatial patterns from different sources: (1) thermosteric sea level grids over 1955 — 2003, (2) sea level grids from Topex / Poseidon satellite altimetry over 1993 — 2003, and (3) dynamic height grids from the SODA reanalysis over 1958 — 2001.
The South Pacific Sea Level & Climate Monitoring
Project Sea Level Data Summary Report JULY 2008 — JUNE 2009 (1.6 MB pdf)
A group of people
analyzing sea level data points from satellite altimetry, where the errors inherent in the methodology are greater than the absolute trend itself and all sorts of adjustments must be made to get anything out of the raw data, are in much worse shape than the guy making the mark in stone.
Long
running sea level data is available at two sites in the UK, North Shields in the North East, and Newlyn in the South West.
«The
new sea level data confirm once again just how unusual the age of modern global warming, due to our greenhouse gas emissions, is,» Rahmstorf said.
Church and White (2011)
examined sea level data from both tide gauges (TGs), satellite altimeter data (Sat - Alt), and the estimated contribution to the sea level rise from various sources (Figure 4).
Figure 5: Tilted global
sea level data produced by Monckton and Mörner in the SPPI Monthly CO2 Report for January 2011
Obviously this conspiracy theory is utterly absurd, and is easily disproven by simply examining the IPCC Third Assessment Report (TAR) published in 2001, two years before Mörner's accusation of
falsified sea level data, which shows an approximately 10 to 15 mm rise in average global sea level from 1993 to 1998 (Figure 3).
The data - adjusters take misaligned and
incomplete sea level data from tide gauges that show no sea level rise (or even a falling trend).
A research paper by two Australian climate science deniers claimed the Permanent Service for Mean Sea Level (PSMSL), based at the UK's National Oceanography Center, had «arbitrarily»
altered sea level data from Aden, in Yemen.
A review of trend models applied to
sea level data with reference to the «acceleration - deceleration debate» Global sea levels have been rising through the past century and are projected to rise at an accelerated rate throughout the 21st century.