JoNova

A science presenter, writer, speaker & former TV host; author of The Skeptic's Handbook (over 200,000 copies distributed & available in 15 languages).


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Asian sea levels changed rapidly 6,000 years ago — natural sea level rise “unprecedented”

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 [...]

Storm trends in Australia and New Zealand? No evidence that CO2 increases extreme weather

Get ready — for all the fears of extreme weather coming our way — studies of Queensland, Victoria, the whole of SE Australia, New Zealand, and Perth show that either nothing is changing (there have always been bad storms) or possibly, the weather is better now than it used to be. Where is the evidence to support the claims by alarmists that increasing CO2 will make “extreme weather” more common? It’s less windy now across South East Australia than it was in the 1920′s. It’s less stormy on the southern coast of Victoria, and records that go back 7000 years in New Zealand and 5000 years in Queensland show repeated examples of monster storms that — should they hit today, would be described as being “likely” due to coal fired power stations and excessive use of SUV’s.

The Science and Public Policy Institute published  Historical storm trends in Australia and New Zealand in June. This post builds on that publication.

It’s less windy across South East Australia

Alexander et al 2011 looked at locations from Port Lincoln (SA) to Goondiwindi (QLD), to Hobart (Tas) which pretty much covers everything anyone could call South East Australia. They used wind [...]