Sea level rise inevitable for Pacific Islands despite future greenhouse gas emissions reduction, NASA finds

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Sea level rise inevitable for Pacific Islands despite future greenhouse gas emissions reduction, NASA finds

时间：2024-09-30 17:36 来源：未知作者：admin 阅读：次

Climate change is the number one concern of island nations such as Tuvalu who are seeing sea levels rise.

In short:

New research from NASA has found sea level rise is inevitable for Pacific Island countries even if greenhouse gas emissions are reduced in the short term.

The analysis projects a significant increase in flooding in low-lying nations like Tuvalu and Kiribati by the 2050s.

What's next?

Experts say they plan to build more high-resolution maps for more Pacific Island countries in the near future to support mitigation efforts.

Pacific Island nations such as Tuvalu, Kiribati and Fiji will experience at least 20 centimetres of sea level rise in the next 30 years regardless of whether greenhouse gas emissions change in the short term, according to new research from NASA.

The analysis found that the number of high-tide flooding days — otherwise known as nuisance flooding or sunny day flooding (a temporary inundation of low-lying areas, especially streets) — in an average year will increase significantly for nearly all Pacific Island nations by the 2050s.

For example, areas of low lying island Tuvalu that currently see less than five high-tide flood days a year could average 25 flood days annually by the 2050s.

In Kiribati, regions that see fewer than five flood days a year today will experience an average of 65 flood days annually by the 2050s, according to the research.

The NASA Earth Science Division's ocean physics program director, Dr Nadya Vinogradova Shiffer, said their findings provided a clearer picture of what "flooding frequency and severity look like" over the coming decades.

New projected flooding maps by NASA show areas of Kiribati that will be vulnerable to high tide flooding in the next 30 years.

"Sea level will continue to rise for centuries, causing more frequent flooding," she said.

The effects of sea level rise differ across the world due to several factors including global and local conditions, the topography of a coastline and how glacial meltwater is distributed in the ocean.

King tides damaged roads near the coast in Funafuti, Tuvalu.

However, Pacific Island nations face more dire circumstances compared to the rest of the world.

"We're always focused on the differences in sea level rise from one region to another, but in the Pacific the numbers are surprisingly consistent," said Ben Hamlington, a sea level researcher at NASA's Jet Propulsion Laboratory in California and the agency's sea level change science team lead.

Airports at risk of regular flooding

NASA's research found that impacts of a 20-centimetre rise in sea level will also vary from country to country in the Pacific Islands.

For instance, some nations might face frequent neighbourhood flooding equivalent to being inundated for nearly half the year.

Others could experience nuisance flooding several times a year at their airport.

Tuvalu along with other Pacific Island nations is expected to experience high tide flooding in certain areas due to rising sea levels, according to latest NASA research.

The agency’s sea level team released high-resolution maps this week showing which areas of different Pacific Island nations will be vulnerable to high-tide flooding.

The maps outline flooding potential in a range of emissions scenarios, from best-case to business-as-usual to worst-case.

Researchers at several universities including the University of Hawaii and Virginia Tech, started with flood maps of Kiribati, Tuvalu, Fiji, Nauru and Niue.

A king tide inundates a home on Funafuti, in Tuvalu, in February.

They plan to build high-resolution maps for other Pacific Island nations in the near future, aimed at supporting mitigation efforts.

Researchers said their aim to combine satellite data on ocean levels with ground-based measurements of sea levels at specific points are hindered.

"There's a real lack of on-the-ground data in these [Pacific Island] countries," Mr Hamlington said.

NASA's research was conducted at the request of several Pacific Island nations, including Tuvalu and Kiribati, and in coordination with the US State Department.

While scientists say rising sea levels will bring significant impacts to Pacific Island nations, some research has shown hundreds of islands in the Pacific are growing in land size due to sediment, corals and other debris being washed ashore.

By：https://www.abc.net.au/news/2024-09-26/sea-levels-will-rise-new-research-nasa/104400114

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