Periodicity of wave-driven flows and lagoon water renewal for 74 Central Pacific Ocean atolls

French Polynesia atolls are spread on a vast 2300 by 1200 km Central Pacific Ocean area exposed to spatially and temporally dependent wave forcing. They also have a wide range of closed to open morphologies and several have been suitable to develop from black-lipped pearl oysters a substantial pearl farming activity in the past 30 years, representing nowadays the 2nd source of income for French Polynesia. Considering here only the component of lagoon renewal that is driven by waves, we investigate for 74 atolls different lagoon renewal metrics using 20 years of wave model data at 0.05° spatial resolution. Wavelet spectral analyses highlight that atolls, even in close vicinity, can be exposed to different and characteristic periodicities in wave-driven flows and water renewal. These characteristics are discussed in relation to pearl farming atolls, including atolls known to be efficient oyster spat producers, a critical activity for pearl farming sustainability.

Keyword(s)

Tuamotu, Pearl farming, WaveWatch III, Hoa, Residence time, Wavelet transform

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Supplementary Fig. S1. The real part (solid) and imaginary part (dashed) for the Morlet wavelet in the time domain used for the analysis of atoll lagoon water renewal metrics.
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How to cite
Andréfouët Serge, Desclaux Terence, Buttin Julie, Jullien Swen, Aucan Jérôme, Le Gendre Romain, Liao Vetea (2022). Periodicity of wave-driven flows and lagoon water renewal for 74 Central Pacific Ocean atolls. Marine Pollution Bulletin. 179. 113748 (17p.). https://doi.org/10.1016/j.marpolbul.2022.113748, https://archimer.ifremer.fr/doc/00772/88372/

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