Global Sea Level Trends
Rising sea levels are often in the headlines these days. Historical analysis indicates sea levels have risen significantly since the last ice age. However, only in the last century has accurate measurement of changes in sea level been possible. If you are interested to see the sea level trends in your area, NOAA provides this excellent tool.
Selecting a location and then “Linear Trend” provides the trendline of the rise, or the fall. Not commonly known is that sea levels are actually falling in some regions, including Alaska and Finland. Measured rises in other areas can be complicated by factors such as natural land subsidence. This phenomenon is often exacerbated by groundwater pumping, or reducing sedimentation in rivers due to construction of dams or flow diversion. These factors are suggestive as to why New Orleans, on the Mississippi River, shows a steeper trend line for rising sea level than other areas. Plate tectonics have been cited as a cause of the sinking of Venice.
Subsidence in New Orleans
Image is from the NOAA tides and currents tool.