Their interim plan, to use any GPS stations within 15 km (I think) is only «better than nothing» and allows at least, in most cases, to correct for continental vertical land movement (VLM), but does not account for vertical movement of the structure to which the Tide Gauge is actually attached, which means that all VLM attributable to
local subsidence looks like SLR at the gauge.
So you've gone through and looked at all the individual tidal gauges, corrected for local effects like post glacial rebound from the last ice age,
local subsidence due to soil compaction or groundwater removal, local soil buildup due to tidal or river silt deposition, discontinuities due to earthquakes, and the like?
In cities such as Jakarta, the rise is aggravated by big
local subsidence.
Not exact matches
Deltas are highly sensitive to increasing risks arising from
local human activities, land
subsidence, regional water management, global sea - level rise, and climate extremes.
Solano - Rojas and his colleagues then correlated their maps of differential
subsidence with the locations of reported track damage and accidents collected from
local newspapers, YouTube, and Twitter.
The
subsidence is causing
local sea levels to rise nearly 100 times faster than the global average.
In Bangladesh,
subsidence can be much higher than GIA — with 10mm / yr being a
local norm, rather than an extreme rate.
In any case, a sudden
local sea level rise via rapid
subsidence is most unlikely and such a rapid change due to proglacial lake release (or whatnot) even less so.
Vertical land movements such as resulting from glacial isostatic adjustment (GIA), tectonics,
subsidence and sedimentation influence
local sea level measurements but do not alter ocean water volume; nonetheless, they affect global mean sea level through their alteration of the shape and hence the volume of the ocean basins containing the water.
However, as we have seen throughout this section, the tidal gauge estimates the IPCC used to estimate global sea level trends are contaminated by
local trends, such as tectonic activity, post-glacial rebound... and the coastal
subsidence that Syvitski et al. identified!
The report said the earlier readings were incomplete or skewed by
local factors such as
subsidence.
In some parts of the world, especially low - lying river deltas,
local land is sinking (known as
subsidence)-- making sea levels that much higher.
e.g. models of eustacy («worldwide change of sea level as contrasted with
local diastrophic uplift or
subsidence of the land») vs isostacy (glacial rebound following glaciation / melting) vs
local sinking / rising from glaciation / interglacial warming, CO2, and / or solar variations, and their causes.
► Relative sea - level rise occurs where there is a
local increase in the level of the ocean relative to the land, which might be due to ocean rise and / or land level
subsidence.
Boutrous pointed out that while global sea levels are rising on average, some evidence shows that sea levels have fallen in specific regions, and coastal flooding in places like the San Francisco Bay Area is also a function of
local conditions like land
subsidence.
In the future, high - end estimates of ice discharge and regional effects, such as
local thermal expansion and coastal
subsidence, place the upper limits of relative sea - level rise for the Netherlands at 0.65 to 1.3 m by 2100, excluding gravitational effects.
In more vulnerable places like Tidewater, VA, or New Orleans, or Miami, such a larger swelling of the world's ocean could translate to 2 - 3 feet due to
local conditions like
subsidence or ocean current change.
We suggest that the resolution of this issue is consistent with our estimate of the approximately +7 m Holsteinian global sea level, and is provided by Raymo & Mitrovica [58], who pointed out the need to make a glacial isostatic adjustment (GIA) correction for post-glacial crustal
subsidence at the places where Hearty and others deduced
local sea - level change.
As coastal communities have become aware of the problems associated with groundwater depletion and coastal
subsidence, the rate of
local sea level rise has slowed, at Galveston at least (Paine et al., 2012, GCAGS Journal 1:13 - 26), so the likely sea level rise is even less than the corrections above would imply.
Note that these trends may include a component of
subsidence / uplift of the islands themselves and so are the numbers most relevant for
local planning (not eustatic sea level change).
The effects of global warming will be
local, and nuisance claims in particular will increase as we see more floods, fires and
subsidence.
Subsidence issues will usually be well known by other
local Beverly business owners and such.
For example, a
local company who offers Hoboken renters insurance will no doubt be very familiar with the different issues that their clients face, such as
subsidence, a tendency to be involved in an earthquake, flood insurance and where the flood plains actually start and end, and other important details.