Rising Seas in the Pacific
Since 1993 the sea around the Pacific Islands has risen by an average of 7mm a year, which is more than double the global average. This means that global heating is already proving an existential threat to the Marshall Islands. 58,413 people live on the five islands and 29 coral atolls which make up the Marshall Islands. Due to the very low elevation of these islands the whole country is threatened by climate change and rising sea levels.
The World Bank's Adapting to rising sea levels in Marshall Islands uses Esri's storymap template to visualize how different levels of rising seas will affect the islands. The storymap looks at the impact that three different sea level rise intervals (0.5 meters, 1m, and 2m) would have on the coastal communities of the Marshall Islands.
A sea level rise of only 1 meter rise will inundate 37% of the building stock in the capital city of Majuro. A 2 meter rise would see all of Majuro's buildings at risk of permanent inundation. The Marshall Islands are already experiencing more frequent flooding than historical averages and more intense cyclonic storms.
The World Bank's storymap explores different adaption pathways which could be taken by the Marshall Islands in response to rising sea levels. These pathways include relatively benign measures such as building sea walls and revetments. However at the extreme level these pathways include relocation and migration to other areas of the world. The World Bank says that out-migration from the Marshall Islands is already occurring - mainly for economic reasons. However climate induced migration could become the adaption pathway of last resort for the islanders.
If you want to know how rising sea levels could affect other locations across the world you can use Climate Central's Coastal Risk Screening Tool.
This interactive map allows you to see which areas around the globe are
most threatened by sea level rise and coastal flooding. The map uses
coastal elevation data with the latest projections for future flood
levels to model how rising seas will impact coastal communities.
Comments
https://oceanservice.noaa.gov/facts/sealevel-global-local.html
Ocean currents might affect it, but I'm having a real hard time imagining how it would because the current should affect the baseline water height before any hypothetical rise and the rise just adds to it.
Variations in land height have nothing to do with the water rising more in a specific location than anywhere else. Either the water is 20cm higher or it's not. All land height can affect is how far inland the rise travels.
The south pacific never had glaciers... I live somewhere that had 2 miles of ice on it 50k years ago and the land is rebounding at a level that is almost impossible to measure because it's so minute.
Fluid mechanics: Two points in the same sea can easily have different levels, even though they are at the same pressure, if the water density varies. Density can vary with temperature of the water column at each point, or the salinity.
Fluid dynamics: If the same two points have the same levels, but different pressures, a current will result. If the two points have different current velocities, even though the density is the same, the level will be different.
Water Properties: Water density varies considerably with temperature. Warm water is less dense and has a larger volume than cool water, hence 1000 lbs of hot water will have a higher level in its container than if it was cooler.
The Earth's atmosphere is subject to the same principles, although currents, pressures and densities of air are much greater for a similar change in temperature.
These can be seen in simple form by studying the Bernoulli Equation.