Heterogeneous sea-level rises along coastal zones and small islands  

作　　者：Guoshuai Li Xin Li Tandong Yao Tao Che Hong Yang Mingguo Ma Haipeng Zhao Xiaoduo Pan 

机构地区：[1]Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China [2]Center for Excellence in Tibetan Plateau Earth Sciences,Chinese Academy of Sciences,Beijing 100101,China [3]Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [4]Dapartment of Geography and Environmental Science,University of Reading,Whiteknights,Reading RC6 6AB,UK [5]Research Base of Karst Eco-environments at Nanchuan in Chongqing,Ministry of Natural Resources,School of Geographical Sciences,Southwest University,Chongqing 400715,China [6]Department of Earth and Environmental Systems,Indiana State University,Terre Haute,IN 47809,USA

出　　处：《Science Bulletin》2019年第11期748-755,共8页科学通报（英文版）

基　　金：supported jointly by the Strategic Priority Research Program of Chinese Academy of Sciences(XDA20100104 and XDA20100300);the 13th Five-year Informatization Plan of Chinese Academy of Sciences(XXH13505-06)

摘　　要：Coastal zones and many small islands are highly susceptible to sea-level rise(SLR). Coastal zones have a large exposed population and integrated high-value assets, and islands provide diverse ecosystem services to millions of people worldwide. The coastal zones and small islands affected by SLR are likely to suffer from submergence, flooding and erosion in the future. However, very few studies have addressed the heterogeneity in SLR changes and the potential risk to coastal zones and small islands. Here we used the mean sea level(MSL) derived from satellite altimetry data to analyse the trends and accelerations of SLRs along global coastal zones and small islands. We found that except for the Antarctic coastal zone, the annual MSL within 50 km of the coasts presented an increasing trend of 3.09 ± 0.13 mm a^-1 but a decreasing acceleration of -0.02 ± 0.02 mm a^-2 from 1993 to 2017. The highest coastal MSL trend of3.85 ± 0.60 mm a^-1 appeared in Oceania, and the lowest trend of 2.32 ± 0.37 mm a^-1 occured in North America. Africa, North America and South America showed acceleration trends, and Eurasia, Australia and Oceania had deceleration trends. Further, MSLs around global small islands reflected an increasing trend with a rate of 3.01 ± 0.16 mm a^-1 but a negative acceleration of -0.02 ± 0.02 mm a^-2. Regional heterogeneity in the trends and accelerations of MSLs along the coasts and small islands suggests that stakeholders should take discriminating precautions to cope with future disadvantageous impacts of the SLR.Coastal zones and many small islands are highly susceptible to sea-level rise（SLR）. Coastal zones have a large exposed population and integrated high-value assets, and islands provide diverse ecosystem services to millions of people worldwide. The coastal zones and small islands affected by SLR are likely to suffer from submergence, flooding and erosion in the future. However, very few studies have addressed the heterogeneity in SLR changes and the potential risk to coastal zones and small islands. Here we used the mean sea level（MSL） derived from satellite altimetry data to analyse the trends and accelerations of SLRs along global coastal zones and small islands. We found that except for the Antarctic coastal zone, the annual MSL within 50 km of the coasts presented an increasing trend of 3.09 ± 0.13 mm a-1 but a decreasing acceleration of -0.02 ± 0.02 mm a-2 from 1993 to 2017. The highest coastal MSL trend of3.85 ± 0.60 mm a-1 appeared in Oceania, and the lowest trend of 2.32 ± 0.37 mm a-1 occured in North America. Africa, North America and South America showed acceleration trends, and Eurasia, Australia and Oceania had deceleration trends. Further, MSLs around global small islands reflected an increasing trend with a rate of 3.01 ± 0.16 mm a-1 but a negative acceleration of -0.02 ± 0.02 mm a-2. Regional heterogeneity in the trends and accelerations of MSLs along the coasts and small islands suggests that stakeholders should take discriminating precautions to cope with future disadvantageous impacts of the SLR.

关 键 词：SEA-LEVEL RISE COASTAL ZONES Small ISLANDS HETEROGENEITY 

分 类 号：N[自然科学总论]