REAL Green wrote:“Sea-level rise from climate change could exceed the high-end projections, scientists warn”
https://www.fasterthanexpected.com/2020 ... ists-warn/“A big concern of Englander’s for our future is the non-linear behavior of sea-level rise. In recent years the pace of sea-level rise has been accelerating. In the 1990s the oceans rose at about 2 millimeters per year. From 2000 to 2015 the average was 3.2 millimeters per year. But over the past few years the pace has quickened to 4.8 millimeters per year. At the current pace, we can expect at least 15 more inches of sea-level rise by the year 2100. But, as has been the case for the past few decades, the pace of sea-level rise is expected to continue to increase for the foreseeable future. So, 15 inches is not only a lower bound, it is also extremely unlikely. Adding confidence to the paper’s warning that IPCC projections for a strong warming scenario may be too low, is the evidence that sea-level rise has been running on the high end of IPCC projections for decades. Historically speaking, simple math reveals that for every degree Fahrenheit the Earth warms, sea-level eventually rises by an astonishing 24 feet. Considering that Earth has already warmed 2 degrees Fahrenheit since the late 1800s, we know that substantial sea-level rise is already baked in, regardless of whether we stop global warming. Scientists just don’t know exactly how long it will take to see the rise or how fast it will occur. But using proxy records, glaciologists can see that as we emerged from the last Ice Age, sea level rose at remarkable rates — as fast as 15 feet per century at times.”
Historically the deglaciation at the end of the last ice age added in the meltwater pulse periods between 55mm-61mm a year for 400-500 years before returning to a base rate around 2mm/year. In American terms that is 2.2-2.5 inches a year at the very worst rates of rise.
That doesn't sound like a heck of a lot but when it goes on year in and year out it really adds up accumulating up to 80 feet in each major melting event spread over several centuries.
I wouldn't be too surprised if we trip a climate tipping point and melt rates rise so we are getting 50-60mm of sea level rise a year. However even if that did happen a old timer using a walker could still very easily outrun sea level rise. At a few inches a year sure, lots of total land around the world coastline will be lost, but it won't be a great loss in any one location on any given year. Losing a 3 inch width of beach around all the continents adds up to hundreds of square miles/kilometers but for Joe beach house owner it just means the next storm surge will be a few inches higher, not that he has to abandon his beach house this year vs 5 or 10 years down the line. And as dear Joe has to give up his beach house the people owning the strip of land just up slope from him will become beachfront property owners in their turn for a few years or maybe more than a decade depending on rates and extent of the rise.
If that claim that the already baked in 2F temperature increase means a 48 foot total sea level rise over the next few centuries well most of the Meltwater Pulse reconstruction from paleoclimate studies say these events take 400-500 years to run their course. I personally hope to make it to say 85-90 years old so even if this started the day i was born I would only have seen 10-12 feet of the rise by the time old age catches up with me.
Sure a complete global melt down would add 220-240 feet to mean sea level, but here in Toledo I am already at 580 feet so even if it all melted overnight it wouldn't directly impact me, it would be the displaced residents that would upset my applecart so to speak. IIRC Memphis, TN is around 230 feet so maybe if you are a big believer in instant sea level rise you should invest in future beach front around there.