If you thought seas were constant 6,000 years ago…
Microatolls are apparently very accurate proxy for sea levels, giving a higher resolution estimate of sea levels. But the extra data suggests more natural oscillations in seas than the experts used to think. Six thousand years ago, near Indonesia, seas apparently rose and fell twice by as much as 60 centimeters in a 250 year period. A similar pattern happened 2,600km away in SE China. Seas were changing so fast researchers estimate the shift occurred at 13mm per year and comment that these regional changes are “unprecedented in modern times.” (Or unrepeated, perhaps?) At the first peak 6,750 years ago, seas were 1m higher than today. The current rate of sea level change is 1mm a year in hundreds of tide gauges and 3mm in “adjusted” satellite data).
From the paper I gather that sea levels in this region change a lot even now. ENSO and the Indian Ocean dipole slop the oceans back and forward. Meltzner et al don’t know why the seas around asia changed so much in the holocene, nor do they know if this is a global phenomenon. They talk about other studies on the Great [...]
A group called NGIS Australia are helping climate skeptics find cheaper beach-houses. They’ve put up a website called Coastalrisk.com.au and an App to scarify homeowners. There’s a spike coming, it’s accelerating, and we’re talking billions of dollars.
Do I hear tipping point? It’s a tipping point:
At the moment, there are only a few homes impacted by coastal flooding, high tides and storms but Mr Mallon said we needed to brace for a big spike.
“Tens of thousands of homes in Australia — meaning hundreds of millions of dollars in property — are under increasing threat,” he said.
You could say they’ve gone full mental with the fear factor — especially when global sea levels are rising at about 1mm a year (according to a thousand tide gauges). In Sydney, sea levels are streaking up even slower, at 0.6mm a year.
Changes in sea levels in Australia don’t fit the carbon meme too well. Sell up anyway.
Australian-NZ seas were changing as fast or even faster before World War II.
How many Australians? Seriously…
About 80 per cent of Australians who live near the coast could be the target [...]
This is a big deal. Here’s a state government telling people to be more scientific, and not blindly follow the IPCC. This is a win we need to translate to other areas.
The former Labor government in NSW had told councils they had to plan for sea-level rise “according to the IPCC”, but that made sea-side properties unsalable, and was pretty painfully stupid compared to what the tide gauges were actually saying (like in Sydney where the rise is a tiny 6cm a century). The new strategy says councils need to be scientific and look at the conditions on each beach separately.
In this issue, the costs of following the IPCC plan were borne by those living on the coast (and property developers), and that pain motivated them to press the State government to get the IPCC out of the way. This is a reminder that it is worth protesting and sane things do happen.
If we can get citizens of the free west to appreciate the true cost of the IPCC, it would surely be gone by 2020. Now there’s a target..
Rob Stokes announces shake-up of council coastal management
In an interview with The Australian, [...]
Minister Peter Dutton made a joke about Pacific Islander time. The Offendotrons howled and called for him to be sacked. But the real problem here is not the small 1mm rise in sea-levels, it’s the the national media end up discussing global “offense” levels rather than sea levels. The scientific data shows there is no issue. Australian taxpayers pay the ABC, the CSIRO and the BOM to inform the Australian public, yet none of them explained that the real sea level rise recorded in Kiribati is less than 1 mm a year. Why not? The ABC does not clear the fog for Australians, it generates it. Dutton apologized, but he shouldn’t have. It feeds the offendotrons. They didn’t accept it, won’t stop referring to his comment, nor start talking about real problems. Apologizing only extends the time our national conversation is wasted on mindless things.
Yet again, the unfunded bloggers report the scientific data and not the institutes we pay to do that?
Noting that today’s meeting to discuss the resettlement of refugees was running late, Mr Dutton quipped that it was running to “Cape York time”, to which the Prime Minister replied: “We had a bit of [...]
Headlines across Australia yesterday told us the dire news that a new study finds that “Sea level rising faster in past 20 years than in entire 20th century“. A new paper by Watson et al is driving the headlines, but underneath this Nature paper is a swamp of adjustments, an error larger than the signal, and the result disagrees with many other studies and almost all the raw measurements. Paper after paper kept showing that sea levels rates had slowed (e.g Chen showed deceleration from 2004, Cazenave said in the last decade sea-levels had slowed 30% (but argued post hoc adjustments could solve that). Beenstock used 1000 tide gauges and found no acceleration of sea levels over the last 50 years. A different researcher — Phil Watson, found that Australian sea levels rose faster before World War II then slowed down.)
Firstly, hundreds of tide gauges show sea level rising at about a third of the rate than satellites do. Worse, the original satellite raw data showed the same slow rise, until it was suddenly adjusted. The real scandal is that the rapidly rising trend was largely created by adjustments in the first place. These latest corrections just adjust down [...]
Sea levels are part of the scare campaign, but how many journalists ask, and how many scientists admit, that sea levels in the South Pacific are noisy data that changes as the ground moves and the ocean slops back and forward? The Pacific averages 4 km deep. Is it any wonder that slight changes in winds and currents will shift the top 10cm, just 0.0025% , around? Long term sea level changes are difficult to assess. But this is not what we hear much in the media:
“Rising sea levels making island nations such as Vanuatu more vulnerable to storms and amplifies the impact of tropical cyclones” –The Guardian
“Coastal flooding is a sleeping giant,” it says. — The Climate Council (News.com)
The good recent data shows big rises and falls that don’t correlate with CO2
A very neat high-quality network of SeaFrame equipment was installed around South Pacific Islands in 1992 to measure both land and sea movements. This is called the Pacific Sea Level Monitoring Project. It is maintained by the Australian BoM. The geodetic observations are done by Geoscience Australia.
These tide gauges show that sea levels are rising and falling around Vanuatu [...]
Skeptics, and particularly Nils-Axel Mörner have been saying that sea level rise, as recorded by tide gauges has been much slower than widely advertised. They’ve also pointed out how the rates of sea-level rise have either stayed the same or slowed down. There’s been no sign of the acceleration needed for the wildly speculative hypothesis that your SUV, and China’s coal plants are warming the ocean.
This week a new Nature paper (Hay et al) shows the skeptics were right — but did that view make it to any news broadcast?
Watch the sea-level scare mutate
Even in The Australian the spin from the propaganda machine gets a running, and the previous slow rise is used to pump the scare that the modern “acceleration” is even scarier. What the Australian (and selected sea level “experts”) don’t mention is that the tide-gauges don’t show any acceleration, and nor did the raw recordings from satellites. The 3mm rising sea claims apparently come from satellites that were calibrated to one subsiding tide gauge in Hong Kong.
It’s cherry picking par excellence. We might finally accept tide gauges up to 1990, but after that the tide gauges don’t count — bring in the “adjusted” [...]
In The Australian Bob Carter compares the long term tide gauge record in Sydney with projections, and exposes the exorbitant cost of insurance for alarmist sea level forecasts. The good news is that it appears councils are waking up, and “peak-sea-level-panic” is behind us.
Sea-level alarmism has passed high tide and is at last declining. With luck, empirical sanity will soon prevail over modelling.
After years of research it turns out that talking about “global” sea level rise is nearly meaningless to real people who live in one place. The ocean rise varies locally from beach to beach from as little as 5cm per century to as much as 16cm per century. The variations are mostly due to different rates of land subsiding or rising.
More importantly, the rate of rise was either the same or was even faster before World War II when CO2 levels were “safe”.
Figure 5: Comparison of decadal rates of change over historical record. Analysis based on relative 20-y moving average water level time series. | Watson 2011
Fort Denison in Sydney has one of the longest running continuous records, starting in 1886, and finally local councils are realizing that they need [...]
Is the latest sea-level rise unusual? Kurt Lambeck said it was, based on his version of the Holocene seas, calculated with modeled crustal movements (to try to guess the rises and falls of the beaches where the sea levels were changing). Obedient science reporters broadcast his message to the world without asking a single hard question. But when the error bars are 2 meters wide and the dating estimates range over hundreds of years, I thought it beyond silly to think we could estimate 100-year average sea level rises in the time of Moses. Nils-Axel Mörner agrees, and shows data below from 50 years of research which demonstrates that sea levels are always oscillating, and that in Europe, the US, the Indian Ocean past changes are larger than the current ones. Nils has published nearly 600 papers on observations of sea-levels around the world. He calls the Lambeck paper an “insult” to geologists and sea-level researchers. — Jo
An insult to geology and sea level research
by Nils-Axel Mörner
Paleogeophysics & Geodynamics, Stockholm, Sweden, (morner AT pog.nu)
In the 60s, there was a vigorous debate [...]
Kurt Lambeck at ANU scored a Climate Bingo moment in the modern media last week with declarations that the 20cm rise in sea levels last century was “unprecedented” in the last 6,000 years! But sea level is fiendishly difficult to measure thanks to rising and falling bits of land. Present day scientists argue over sea level changes in the last 10 years, yet Lambeck seems to have figured out the sea levels in 4000BC. Tricky, what.
When Nils Axel-Morner tried to figure out which modern spot in Denmark is tectonically stable he looked at 60 years of detailed data, from 40 beaches around Denmark. Lambeck has a model that kinda does all that and more. It works out the mass of the icesheets circa Tutankhamen and calculates the mantle conditions. He sorts out the geoidal bulge with assumptions about mantle viscosity to look at tectonic displacement. Hmm. Could be some uncertainty there?
This is Fig 1 from Lambeck et al 2014. Note the scales. Really. Figure how large the 15-20cm rise of the last century would look on the y axis here which doesn’t just cover 150cm, it covers 150 meters. Who would be brave enough to declare that sea [...]
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