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New Paper: 54% Of ‘Vulnerable’ SW Pacific Islands Studied Showed Growing Shorelines

by Kenneth Richard
July 26, 2018, 8:34 AM
in News and Opinion
Reading Time: 3 mins read
A A
2

funafuti atoll tuvaluDespite a rapid local sea level rise rate nearly three times the global mean (1.8 mm/yr), 15 of 28 studied atoll islands in the southwest Pacific increased in shoreline area during 2005 to 2015 (Hisabayashi et al., 2018).

For the three islands that experienced extreme shoreline erosion – with one atoll island even “disappearing” – a Category 5 cyclone was identified as the most likely causal factor.

Consequently, the authors conclude that “the dramatic impacts of climate change felt on coastlines and people across the Pacific are still anecdotal.”


Hisabayashi et al., 2018 (full paper)

Quantifying shoreline change in Funafuti Atoll, Tuvalu using
a time series of Quickbird, Worldview and Landsat data

Summary: “Atoll islands are low-lying accumulations of reef-derived sediment that provide the only habitable land in Tuvalu, and are considered vulnerable to the myriad possible impacts of climate change, especially sea-level rise. This study examines the shoreline change of twenty-eight islands in Funafuti Atoll between 2005 and 2015 … Results indicate a 0.13% (0.35 ha) decrease in net island area over the study time period, with 13 islands decreasing in area and 15 islands increasing in area.  Substantial decreases in island area occurred on the islands of Fuagea, Tefala and Vasafua, which coincides with the timing of Cyclone Pam in March, 2015.”

“Funafuti Atoll is located in the southwest Pacific Ocean, which has experienced some of the highest rates of sea-level rise (~5.1 ± 0.7 mm/yr) from 1950 to 2009 due to regional variability and vertical ground motion. The rate is nearly three times the global mean [~1.8 mm/yr], and corresponds with a total increase in sea level of ~0.30 ± 0.04 m (Ballu et al. 2011; Becker et al. 2012).”

“Most of the islands remained stable, experiencing slight accretion or erosion or a combination of both over time. The total net land area of the islands increased by 1.55 ha (0.55%) between 2005 and 2010, and it has decreased by 1.90 ha (0.68%) between 2010 and 2015, resulting in a net decrease by 0.35 ha (0.13%).  Over this 10-year period, 13 of 28 studied islands had a net decrease in area, ranging from −0.04% on Fongafale (−0.06 ha) to −100% on Vasafua (−0.07 ha). The decrease in area adds up to −2.56 ha and the mean reduction in island area for these 13 islands was −0.20 ha (−20.5%). The largest absolute decreases in island area occurred on Fuagea (−0.90 ha, −78.33%), Fualefeke (−0.54 ha, −7.94%), and Tefala (−0.34 ha, −43.86%), and Vasafua experienced the largest percentage decrease (−0.07 ha, −100%). Vasafua’s “disappearance” is discussed below. The remaining 15 of 28 studied islands had a net increase in area, totaling 2.21 ha, with a range from negligible values (Motugie, 0.01%, 0.00002 ha) to a 5.05% growth on Falefatu (0.18 ha). The mean increase in island area for these 15 islands was 0.15 ha (2.41%). The largest absolute increase in island area occurred on Funafala (0.83 ha, 3.56%), Avalau-Teafuafou (0.33 ha, 2.74%), and TeleleMotusanapa (0.33 ha, 3.59%).”

Image Source: Hisabayashi et al., 2018

“The imagery captured in 2015 reveals a significant change in shape and size of the vegetated area for all three islands, and Vasafua’s vegetation is completely missing in the 2015 image. These drastic differences between the 2014 and 2015 imagery are most likely the impacts of Cyclone Pam, which was a Category-5 tropical cyclone that struck the Pacific region on March 9–16 in 2015. Substantial decreases in island area were detected in three small, uninhabited islands all located in the southwestern rim of Funafuti Atoll (Fuagea, Tefota, and Vasafua). … The most drastic changes in these islands occurred between December 2014 and June 2015, which we deduce to be the impact wrought by the Category 5 Cyclone Pamthat passed through the southwest Pacific Ocean in March 2015…. [T]he level of details observed in this study on Vasafua islet that lost all vegetation due to Cyclone Pam would not have been detected if not for the availability of fine spatial resolution data and the short revisit times.”

Image Source: Hisabayashi et al., 2018

“Some studies (Leatherman, Zhang, and Douglas 2000; Romine et al. 2013; Albert et al. 2016) have systematically/rigorously shown the relationship between sea-level rise and shoreline changes, but the dramatic impacts of climate change felt on coastlines and people across the Pacific are still anecdotal and highlights the urgent need for further research.”

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Comments 2

  1. David Lewis says:
    7 years ago

    I don’t know if this applies to the islands in the study, but islands that have volcanoes as the underlining structure are likely to be sinking. That is because the volcanoes are sinking. This can explain why the sea level appears to be rising faster where the islands are. These islands are maintained by material generated by their coral reefs.

    Oceans are doing different things at different places at the same time. On the Oregon coast there many very high islands. These use to be part of the mainland but have been isolated by erosion. I have been in other places in Oregon where the sand extends miles from the shore line. These areas have been built up by the ocean. Both processes have been occurring for hundreds of years at the same time.

    We can expect the same variety of activity on the Pacific Islands. However, when the desire for easy money and political motivation comes into play, then climate change is causing the islands to loose surface area.

    Reply
  2. Spurwing Plover says:
    7 years ago

    And according to the Eco-Nuts the Arctic Ice cap would be gone by now and the shorelines are getting bigger not smaller These modern Eco-Wackos must live on a diet of nuts because its begning to show

    Reply

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