Itamaraca_Island_CASSIE_ENSO

This study analyzed the shoreline spatiotemporal variability and its relationship with wave power and global teleconnection indices on sandy beaches located on the insular margin of a southern Atlantic tropical island (Itamaracá Island, Pernambuco, Brazil). Accretion and erosion cycles were recorded through coastline behavior between interannual and multidecadal time scales, and the correlations observed were suggestive of El Niño/La Niña Southern Oscillation (ENSO) events influencing wave power and shoreline variability. The study area was subdivided into: Sector 1 (~W–E orientation) and Sector 2 (S–N orientation). Through the free web tool Coastal Analyst System from Space Imagery Engine (CASSIE), a shoreline sample series (Google Earth Engine's public satellite images database), between 1984 and 2020, was extracted and processed. The correlation analysis between wave power and influence of global teleconnection indices used public data from ERA-5 global reanalysis and the global ocean-atmosphere indices of the National Oceanic and Atmospheric Administration (NOAA) covering a 36-years period. The correlations identified between the analyzed time series were statistically supported by applying correlation coefficient (r), significance test (p), wavelet coherence and phase difference and principal component analysis (PCA).