Sea-level rise is occurring much faster than scientists expected – exposing millions more Americans to the destructive floods produced by future Sandy-like storms, new research suggests.
Satellite measurements over the last two decades found global sea levels rising 60% faster than the computer projections issued only a few years ago by the United Nations’ Intergovernmental Panel on Climate Change.
The faster sea-level rise means the authorities will have to take even more ambitious measures to protect low-lying population centres – such as New York City, Los Angeles or Jacksonville, Florida – or risk exposing millions more people to a destructive combination of storm surges on top of sea-level rise, scientists said.
Scientists earlier this year found sea-level rise had already doubled the annual risk of historic flooding across a widespread area of the United States.
The latest research, published on Wednesday in Environmental Research Letters, found global sea-levels rising at a rate of 3.2mm a year, compared to the best estimates by the IPCC of 2mm a year, or 60% faster.
Researchers used satellite data to measure sea-level rise from 1993-2011. Satellites are much more accurate than tide gauges, the study said.
The scientists said they had ruled out other non-climatic causes for the rise in […]