Rising sea levels blamed for the disappearance of five reef islands

he reef islands lost to the sea range in size from one to five hectares.

At least five reef islands in the remote Solomon Islands have been lost completely to sea level rise and coastal erosion, and a further six islands have been severely eroded. Sea level rise, erosion and coastal flooding are some of the greatest challenges facing humanity from climate change. The islands lost to the sea range in size from one to five hectares and supported dense tropical vegetation that was at least 300 years old.

Nuatambu Island — home to 25 families — has lost more than half of its habitable area, with 11 houses washed into the sea since 2011.

This is the first scientific evidence, published in Environmental Research Letters, that confirms the numerous anecdotal accounts from across the Pacific of the dramatic impacts of climate change on coastlines and people.

Previous studies examining the risk of coastal inundation in the Pacific region have found islands can actually keep pace with sea level rise and sometimes even expand.

However, these studies have been conducted in areas of the Pacific with rates of sea level rise of 3-5 millimetres per year — broadly in line with the global average of 3 millimetres per year.

Solomon Islands sea levels rising at three times the average

For the past 20 years, the Solomon Islands have been a hotspot for sea level rise.

Its seas have risen at almost three-times the global average — about 7-10 millimetres per year since 1993. This higher local rate is partly the result of natural climate variability.

These higher rates were in line with what is expected across much of the Pacific in the second half of this century as a result of human-induced sea level rise.

Many areas will experience long-term rates of sea level rise similar to that already experienced in Solomon Islands, but the very lowest emission scenarios.

Natural variations and geological movements will be superimposed on these higher rates of global average sea level rise, resulting in periods when local rates of rise will be substantially larger than that recently observed in Solomon Islands.

The current conditions in Solomon Islands are an insight into the future impacts of accelerated sea level rise.

The coastlines of 33 reef islands were studied using aerial and satellite imagery from 1947 to 2015.

This information was integrated with local traditional knowledge, radiocarbon dating of trees, sea level records, and wave models.

Wave energy appears to play an important role in the dramatic coastal erosion observed in Solomon Islands.

Islands exposed to higher wave energy in addition to sea level rise experienced greatly accelerated loss compared with more sheltered islands.

Twelve islands we studied in a low wave energy area of Solomon Islands experienced little noticeable change in shorelines despite being exposed to similar sea level rise.

But of the 21 islands exposed to higher wave energy, five completely disappeared and a further six islands eroded substantially.

The human story behind rising sea levels

These rapid changes to shorelines observed in Solomon Islands have led to the relocation of several coastal communities that have inhabited these areas for generations.

These are not planned relocations led by governments or supported by international climate funds, but are ad hoc relocations using their own limited resources.

The customary land tenure (native title) system in Solomon Islands has provided a safety net for these displaced communities.

In fact, in some cases entire communities have left coastal villages that were established in the early 1900s by missionaries, and retraced their ancestral movements to resettle old inland village sites used by their forefathers.

In other cases, relocations have been more ad hoc, with individual families resettling small inland hamlets over which they have customary ownership.

In these cases, communities of 100-200 people have fragmented into handfuls of tiny family hamlets. Sirilo Sutaroti, the 94-year-old chief of the Paurata tribe, recently abandoned his village.

“The sea has started to come inland, it forced us to move up to the hilltop and rebuild our village there away from the sea,” he said.

In addition to these village relocations, Taro, the capital of Choiseul Province, is set to become the first provincial capital in the world to relocate residents and services in response to the impact of sea level rise.

The global effort to protect the Pacific

Interactions between sea level rise, waves and the large range of responses observed in Solomon Islands — from total island loss to relative stability — shows the importance of integrating local assessments with traditional knowledge when planning for sea level rise and climate change.

Linking this rich knowledge and inherent resilience in the people with technical assessments and climate funding is critical to guiding adaptation efforts.

Solomon Islands National Disaster Council chair Melchior Mataki this “ultimately called for support from development partners and international financial mechanisms”

“This support should include nationally driven scientific studies to inform adaptation planning to address the impacts of climate change in Solomon Islands,” he said.

Last month the Solomon Islands government joined 11 other small Pacific Island nations in signing the Paris climate agreement in New York. There was a sense of optimism it would signify a turning point in global efforts.

However, it remains to be seen how the hundreds of billions of dollars promised through global funding models such as the Green Climate Fund can support those most at need in remote communities, like those in Solomon Islands.