Rising Sea Levels NZ
February 26th, 2009Rising sea levels are part of our future so we may as well get on with figuring out how to cope with the changes in sea level due to global warming.
Rather than deny it is happening, or hoping it is some kind of conspiracy, or arguing whose fault it is, this post is about estimating when the sea will rise, and to what levels.
Recent research about global warming has come up with these disturbing findings:
1. Global warming is likely to accelerate at a much faster pace and cause more environmental damage than previously predicted.
http://www.abc.net.au/news/stories/2009/02/15/2491942.htm?section=world)
2. Future temperatures will be beyond anything predicted…
In 2001 the United Nations-sponsored Intergovernmental Panel on Climate Change (UN-IPCC) reported that the average temperature is likely to increase by between 1.4 and 5.8 degrees Celsius (2.5 and 10.4 degrees Fahrenheit) by 2100.
By 2007 the UN-IPCC was predicting temperature rises between 1.1C and 6.4C by 2100… but…one of the authors of the report recently admitted that many factors were not taken into account because of political pressure and the 2007 report seriously underestimated the scale of the problem.
http://news.bbc.co.uk/2/hi/science/nature/7890988.stm)
3. New studies are warning of a greenhouse gas time-bomb that could amplify global warming – permafrost in Siberia and Canada releasing huge amounts of methane.
http://www.smh.com.au/environment/global-warming/feedback-could-amplify-climate-change-peril-20090216-891i.html
4. Widespread devastation of plankton, the start of the food chain in Antarctic waters, by 2030.
http://www.news.com.au/couriermail/story/0,23739,24636575-953,00.html
5. Air temperatures on the Greenland ice sheet have increased by about 3.75 degrees Centigrade (7 degrees Fahrenheit) since 1991. Sure it is just one spot on earth, but if the average was a rise of 3.75 degrees every 20 years for all of the planet, then by 2100 temperatures would be 18.75 degrees Centigrade higher than they are now! (Even at a global rate of change of just 9 degrees Centigrade – which is more and more likely, life will cease to exist in many places, and way before 2100.)
6. Then there is the biggie that I find really worrying – the possibility of a massive and catastrophic release of methane from the ocean floor that could wipe out humanity.
http://www.killerinourmidst.com/
My point here – global warming is here to stay for the foreseeable future.
Get over it and start thinking about the solutions rather than being part of the problem so we can figure out how to survive.
So how far and how fast do I think sea levels will rise?
Here is the historical and measured rate of sea level change:
1990 – 2mm
2000 – 4mm
2010 – 8mm
Notice how the rate doubles every ten years.
I am going to stick my neck out here and give you my best estimates:
By 2050
Low – 5m
Expected – 14m
High – 60m
By 2100
Low – 14m
Expected – 60m
High – 100m
All of this within my grandson’s lifetime…
By the way, if you think 100m is ridiculous, check this out:
“…if greenhouse gas emissions carried on as they were, CO2 levels would be high enough to melt the Greenland and Antarctic ice sheets in 100-200 years, making the sea rise about 100m.”
http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=10551751
Things to do:
1. See what New Zealand looks like when the sea has risen 14m (expected by 2050), by checking out the Google Flood Map.
http://flood.firetree.net/?ll=-36.9762,175.4791&z=9&m=14)
2. See what New Zealand looks like with a sea level rise of 60m (expected by 2100)
http://www.globalwarmingart.com/sealevel?lat=-40.664&lng=170.706&zoom=6
I have yet to develop a 100m map showing the effect of rising sea levels.
But think about this…
When the the sea level rises to 100m:
- The only current major airport still workable in the North Island is Rotorua.
- The mouth of the Waikato River is at Arapuni
- Tirau is on the sea shore
- Kinleith near Tokoroa is the only major industrial zone in the North Island
- Greatford, about 6km north of Bulls on State Highway 1, is at sea level
- The mouth of the Clutha River is at Roxburgh
- The West Coast Road starts at Aylesbury and ends near Wainihinihi
- Our climate is similar to Northern Australia right now
And if you think we will have problems, check out the rest of the world…
(More to follow on this subject)
Comments appreciated.





