Isostatic rebound refers to the process of land rising or sinking to balance out the weight distribution caused by melting of glaciers or removal of heavy loads on the Earth's crust.
Full definition
Take a look first at 1:08:40 which shows a methane emissions chart with high levels of emissions from the Laptev Sea (from earthquakes occurring along the Gekkal Ridge, resulting from increased seismic activity from
isostatic rebound of Greenland from less mass holding it down).
Reference: K. Wallmann, M. Riedel, W.L. Hong, H. Patton., A. Hubbard, T. Pape, C.W. Hsu, C. Schmidt, J.E. Johnson, M.E. Torres, K. Andreassen, C. Berndt, and G. Bohrmann, 2017: Gas Hydrate Dissociation off Svalbard Induced
by Isostatic Rebound rather than Global Warming.
Champagnae, JD; Molnar, P; Anderson, RS; Sue, C; Delacou, B (2007), Quaternary erosion -
induced isostatic rebound in the western Alps.
To construct a global historical record of sea levels, tide gauge records are taken from locations away from plate boundaries and subject to
little isostatic rebound.
However, this may be mitigated if the
present isostatic rebound of the northwest European crust outpaces greenhouse warming induced sea - level rise (Burman & Passe, 2008).
I think Stuart Harmon's (specious) point relates to
possible isostatic rebound (presumably not being accounted for in sea level rise figures!)
Also the error bars went away at some point even though
glacial isostatic rebound is relatively new and would affect tide gauge readings prior to satellite measurement (i.e. how glacial rebound was discovered).
Isostatic rebound in response to glacier retreat (unloading), increase in local salinity (i.e., δ18Osw), have been attributed to increased volcanic activity at the onset of Bølling — Allerød, are associated with the interval of intense volcanic activity, hinting at a interaction between climate and volcanism - enhanced short - term melting of glaciers, possibly via albedo changes from particle fallout on glacier surfaces.
Land height changes, for example due to
isostatic rebound, can also affect local sea levels.
The land experiences changes in altitude due to
isostatic rebound, and tectonic movement, not to mention the fact that the Earth's crust is floating on a molten mantle.
The crust and mantle can bounce back during a large melt, an effect that is called «
isostatic rebound».
Communities located on resistant bedrock or where glacio -
isostatic rebound is occurring are less vulnerable to erosion.
Isostatic rebound is an important factor affecting sea level rise, or what appears to be sea level rise, in those areas where there were glaciers during the last ice age that ended around 12,000 years ago.
Alex, There's a vast amount of evidence of a heavily - glaciated planet at the LGM, including sea level changes,
isostatic rebound, direct geological evidence... really, you are barking up a very silly tree here.
Note that unlike other means of raising sea level, this one does not change the mass of the sea and therefore does not entail
any isostatic rebound of the sort theorized in the 1850s by John Pratt.
Similarly, there's
the isostatic rebound following deglaciation.