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Nan-Wan Bay in Taiwan and the Gulf of Elat in Israel are two differentcoastal environments, and as such, their currents are expected to havedifferent statistical properties. While Nan-Wan Bay is shallow, has threeopen boundaries, and is directly connected to the open ocean, the Gulf ofElat is deep, semi-enclosed, and connected to the Red Sea via the Straits ofTiran. Surface currents have been continuously measured with fine temporal(less than or equal to 1 h) and spatial resolution (less than or equal to1 km) for more than a year in both environments using coastal radars(CODARs) that cover a domain of roughly 10  ×  10 km. Thesemeasurements show that the currents in Nan-Wan Bay are much stronger thanthose in the Gulf of Elat and that the mean current field in Nan-Wan Bayexhibits cyclonic circulation, which is stronger in the summer; in the Gulfof Elat, the mean current field is directed southward and is also strongerduring the summer. We have compared the statistical properties of the currentspeeds in both environments and found that both exhibit large spatial andseasonal variations in the shape parameter of the Weibull distribution.However, we have found fundamental and significant differences when comparingthe temporal asymmetry of the current speed (i.e., the ratio between the timeduring which the current speed increases and the total time). While theNan-Wan Bay currents are significantly asymmetric, those of the Gulf of Elatare not. We then extracted the tidal component of the Nan-Wan Bay currentsand found that it is strongly asymmetric, while the asymmetry of tidallyfiltered currents is much weaker. We thus conclude that the temporalasymmetry of the Nan-Wan Bay currents reported here is due to the strongtides in the region. We show that the asymmetry ratio in Nan-Wan Bay variesspatially and seasonally: (i) the currents increase rapidly and decay slowlyin the northern part of the domain and vice versa in the southern part, and(ii) the asymmetry is stronger during summer

Current temporal asymmetry and the role of tides: Nan-Wan Bay vs. the Gulf of Elat