August 10, 2021

Online Map Shows How Rising Sea Levels Will Impact Humanity

[Forbes, NASA]

NASA’s Sea Level Change Team has created a sea level projection tool based on the Intergovernmental Panel on Climate Change (IPCC) report that visualizes the impacts of future sea level rise on coastlines and communities.

More than 600 million people (around 10 percent of the world’s population) live in coastal areas that are less than 10 meters (32 feet) above sea level.

Global mean sea levels rose by about 20 centimeters (almost 1 foot) between 1901 and 2018, faster than any time in the last 3,000 years.

Models of future sea level rise generally hover around a meter (3 feet) or so within the next 100 years, but how much ice will melt, the temperature of the oceans, oceanic currents, tidal range and coastal geomorphology will affect the local sea level change.

The online map allows users to click anywhere on the global ocean and coastlines, and pick any decade between 2020 and 2150: The tool then will deliver a detailed report for the location based on the projections in the IPCC’s Sixth Assessment Report, released on August 9, which addresses the most updated physical understanding of the climate system and climate change.

The IPCC has provided global-scale assessments of Earth’s climate every five to seven years since 1988, focusing on changes in temperature, ice cover, greenhouse gas emissions, and sea level across the planet. Their sea level projections are informed by data gathered by satellites and instruments on the ground, as well as analyses and computer simulations.

“What’s new here is a tool that we are providing to the community, to distribute the latest climate knowledge produced by the IPCC and NASA scientists in an accessible and user-friendly way while maintaining scientific integrity,” said Nadya Vinogradova Shiffer, program scientist and manager at NASA, who directs NASA’s Sea Level Change science team.

“As the first data-delivery partnership between the IPCC and a federal agency, NASA’s new sea level projection tool will help pave the way for future activities that facilitate knowledge sharing, open science, and easy access to the state-of-the-art climate science. This information is critical to increase climate resilience of nations with large coastal populations, infrastructure, and economies that will be impacted by sea level rise,” said Vinogradova Shiffer.

Along with providing snapshots of rising sea levels in the decades to come, the tool enables users to focus on the effects of different processes that drive sea level rise. Those processes include the melting of ice sheets and glaciers and the extent to which ocean waters shift their circulation patterns or expand as they warm, which can affect the height of the ocean.

“As communities across the country prepare for the impacts of sea level rise, access to good, clear data is key to helping save lives and livelihoods,” said NASA Administrator Bill Nelson. “NASA’s new sea level projection tool will arm the American people and decision makers with the information needed to make critical decisions about economic and public policy, to protect our communities from the potentially devastating effects of sea level rise.”

The tool can display possible future sea levels under several greenhouse-gas-emission and socioeconomic scenarios. A low-emissions future limiting global warming to 1.5 degrees, a “business as usual” trajectory with emissions on their current track and a projected global warming of 2 to 4 degrees above preindustrial levels by the end of the century, and an “accelerated emissions” scenario with temperatures rising well beyond 4 degrees. A low-emission future, for example, would occur if humanity reduces its greenhouse gas emissions, lessening the effects of climate-driven sea level change. A high-emission projection would lead to the most rapid and significant rise in sea level. Warming of over 2 degrees could be enough for Greenland’s ice sheet to melt, which would cause sea levels to rise globally by more than 2 meters (6 feet), TheScientist website reportsRising sea levels not only will displace an estimated 267 million people worldwide, but increase the risk for floods, cause beach erosion and habitat loss for animals and plants living on or near the shoreline.

“The goal is to deliver the projection data in the IPCC report in a usable form while also providing easy visualization of the future scenarios,” said Ben Hamlington, a research scientist at NASA’s Jet Propulsion Laboratory in Southern California, who leads the agency’s Sea Level Change science team.

The sea level projection tool should help people at all levels of government in countries around the world to forecast future scenarios and to develop coastal resources accordingly. “Making sea level science accessible is our primary goal,” said Carmen Boening, a NASA oceanographer who also heads the agency’s Sea Level Portal, which hosts the projection tool.

Another interactive atlas released by the IPCC shows temperature and precipitation changes on a global scale according to the climate change scenarios used to model the sea levels.

By David Bressan

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