Over the last several decades there has been a fair amount of scientific debate over various aspects of the sea level rise since the last ice age - such as the exact timing of the glacial maximum, how much ice was locked up in the gargantuan land-based ice sheets, and the exact timing of the sea level highstand, but the cessation of land ice melt in the late Holocene is a robust feature of the deglaciation models.
An ongoing sea level rise throughout this period, as argued in Fleming , would yield a serious mismatch with sea level proxy records, even if sea level were rising at only 0.
And a trend as large as 0. Fig 6 - Deglaciation modelling of "relative" sea level rise which includes a "theoretical" addition of meltwater to the oceans over the last years.
The rates of theoretical sea level rise are 0. Image from Peltier As well as the deglaciation modeling, paleo sea level research also precludes any appreciable land ice melt over this year interval - as sea level markers indicate that relative sea level continued to fall during this time.
There are also other lines of scientific evidence that won't be delved into here, but we can be reasonably confident that the current sea level rise of 3.
This conclusion is gradually being strengthened as more paleo sea level records are resolved, as they too indicate that the volume of the global oceans has remained static over the last years Woodroffe .
Further research will no doubt refine the picture and resolve some outstanding conflicts, but the general sea level trend since the last ice age is unlikely to be altered much.
I have a question regarding the change in sea level since the holoscene high stand , years ago, as is referenced in this statement: I question whether siphoning has been the only or major factor, as we have plenty of research indicating that ice sheets and glaciers have grown over the past thousand years - until about years ago: Antarctica - general ice sheet volume increase during holoscene.
I know this NASA research is being contested with regards to current net volume change, but have not seen discussion to dispute that Antarctica ice sheet volume has grown during the holoscene overall: In Greenland the now disintegrated Jacobshavn glacier was estimated to be about 2, years old by DMI, and research in the Alps as well as for southern hemisphere glaciers similarly indicate growth in most recent millenia now changing into retreat.
Therefore, it would seem reasonable to assume that growth in glacier and ice sheet volume since the holoscene high stand has caused a decline in mean sea level, and that also the ocean sea bed should have been lifting in response to the reduced ocean volume.
Has land-based ice volume changes since the holoscene high stand been considered for this model? Both ice sheets have seen an acceleration of ice mass loss since I am not questioning AGW or the present net mass loss situation in Antarctica or elsewhere.
My question was if the glacier and ice sheet growth until about years ago have been considered in the sea level model, or if land ice volume of the period since the holoscene high stand was assumed to be constant?
You question 14 was "whether siphoning has been the only or major factor, as we have plenty of research indicating that ice sheets and glaciers have grown over the past thousand years - until about years ago.
If we are talking "major" factors, there is but one. The highstand is the result of siphoning. The literature is still trying to nail down the timing of the final reductions in ice volumes eg see Bradley et al which are greatly more significant than any increases in ice volume through the late holocene.
Changes in sea level through recent millennia have been found to be very small. See for instance Kopp et al whose Fig1a looks like this: You need to be logged in to post a comment.
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The Physical Science Basis. This Elastic Earth Key Points Melting of the massive land-based ice sheets that formed during the peak of the last ice age approx 20, years ago is still affecting sea level today.
As ice mass drained into the global oceans in the form of glacial meltwater, this exchange of mass created collapsing areas of ocean floor into which the ocean water was slowly siphoned.
This deepening of the ocean basins was effectively disguised until such time glacial meltwater was no longer being added to the oceans.
The reason for this is that the rate of glacial meltwater-driven global sea level rise was much greater than the rate of ocean basin deepening and therefore obscured this process.
Once the natural orbitally-driven warming had ceased, eventually so too did the addition of meltwater to the global oceans. Because the ocean volume was no longer increasing, the siphoning of seawater into the collapsing seafloor regions became the dominant signal, and "relative" sea level for much of the Earth actually declined for most of the last years.
This "relative" sea level fall exposed the "three metre beaches" which are common throughout the equatorial ocean.
With human-caused climate change now underway, the seas are rising and this ocean basin-deepening effect is once again disguised because the rate of current sea level rise is outpacing the rate of ocean basin collapse and siphoning.
Satellites that measure global sea level height add 0. The supposition of warm periods in human history Roman, Minoan or Medieval approaching anything like the global warmth of modern-day is contradicted by paleo sea level research.
Current sea level rise and globally-synchronous ice melt is anomalous. The Earth has not seen its like for at least years, and probably longer.
Comments 1 to Steve Case at Rob Painting at Kevin C at MA Rodger at Latest Posts What are the climate change consequences of the midterm elections?
The Holocene sea level highstand When deglaciation ended around thousand years ago there was less water in the oceans than today.
Ocean siphoning part 2 - continental levering The other aspect of ocean siphoning is due to the collapse of the seafloor close to the continents, by the addition of meltwater.
Current sea level rise is anomalous and, by implication, global ice melt too. In essence, we would like our GMSL time series to be a proxy for ocean water volume changes.
So the satellite reports aren't really reporting sea level, they are reporting ocean volume. That means that applications of satellite sea level reports regarding future coastal inundations will be in error by 0.
I learned a lot. Thanks for your effort. Water level evens out in a bathtub, but not so around the Earth. August 1, Release Date: May 19, Label: Share your thoughts with other customers.
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