Articles | Volume 12, issue 3
https://doi.org/10.5194/os-12-733-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/os-12-733-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Current temporal asymmetry and the role of tides: Nan-Wan Bay vs. the Gulf of Elat
Department of Solar Energy and
Environmental Physics, BIDR, Ben-Gurion University, Midreshet
Ben-Gurion, 84990, Israel
Erick Fredj
The Jerusalem College of Technology, Jerusalem, Israel
Hezi Gildor
Institute of Earth
Sciences, The Hebrew University, Edmond J. Safra Campus, Givat Ram,
Jerusalem, 91904, Israel
Gwo-Ching Gong
Institute of Marine Environment and Ecology, National Taiwan Ocean University, Keelung, Taiwan
Hung-Jen Lee
Department of Marine Environmental Informatics, National Taiwan Ocean University, Keelung, Taiwan
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Cited articles
Afargan, H. and Gildor, H.: The role of the wind in the formation of coherent eddies in the Gulf of Eilat/Aqaba, J. Marine Syst., 142, 75–95, 2015.
Ashkenazy, Y. and Gildor, H.: Long-range temporal correlations of ocean surface currents, J. Geophys. Res., 114, C09009, https://doi.org/10.1029/2008JC005235, 2009.
Ashkenazy, Y. and Gildor, H.: On the probability and spatial distribution of ocean surface currents, J. Phys. Oceanogr., 41, 2295–2306, 2011.
Ashkenazy, Y., Feliks, Y., Gildor, H., and Tziperman, E.: Asymmetry of daily temperature records, J. Atmos. Sci., 65, 3327–3336, 2008.
Barrick, D. E., Lipa, B. J., and Crissman, R. D.: Mapping surface currents with CODAR, Sea Technol., 26, 43–48, 1985.
Bartos, I. and Janosi, I. M.: Atmospheric response function over land: Strong asymmetries in daily temperature fluctuations, Geophys. Res. Lett., 32, L23820, https://doi.org/10.1029/2005GL024559, 2005.
Berman, T., Paldor, N., and Brenner, S.: The seasonality of tidal circulation in the Gulf of Elat, Isr. J. Earth. Sci., 52, 11–19, 2003.
Biton, E. and Gildor, H.: The general circulation of the Gulf of Eilat/Aqaba revisited: The interplay between the exchange flow through the Straits of Tiran and surface fluxes, J. Geophys. Res., 116, C08020, https://doi.org/10.1029/2010JC006860, 2011a.
Biton, E. and Gildor, H.: Stepwise seasonal restratification and the evolution of salinity minimum in the Gulf of Eilat/Aqaba, J. Geophys. Res., 116, C08022, https://doi.org/10.1029/2011JC007106, 2011b.
Biton, E., Silverman, J., and Gildor, H.: Observations and Modeling of pulsating density current, Geophys. Res. Lett., 35, L14603, https://doi.org/10.1029/2008GL034123, 2008.
Blanton, J. O., Lin, G., and Elston, S. A.: Tidal current asymmetry in shallow estuaries and tidal creeks, Cont. Shelf Res., 22, 1731–1743, 2002.
Boon, J. D.: Tidal discharge asymmetry in a salt marsh drainage system1, 2, Limnol. Oceanogr., 20, 71–80, 1975.
Carlson, D. F., Fredj, E., Gildor, H., Biton, E., Steinbuck, J. V., Monismith, S. G., and Genin, A.: Observations of tidal currents in the northern Gulf of Eilat/Aqaba (Red Sea), J. Mar. Sys., 102, 14–28, 2012.
Carlson, D. F., Fredj, E., and Gildor, H.: The annual cycle of vertical mixing and restratification in the Northern Gulf of Eilat/Aqaba (Red Sea) based on high temporal and vertical resolution observations, Deep-Sea Res., 84, 1–17, 2014.
Chu, P. C.: Probability distribution function of the upper equatorial Pacific current speeds, Geophys. Res. Lett., 35, L12606, https://doi.org/10.1029/2008GL033669, 2008.
Chu, P. C.: Statistical Characteristics of the Global Surface Current Speeds Obtained From Satellite Altimetry and Scatterometer Data, IEEE J. Sel. Top. Appl., 2, 27–32, 2009.
Friedrichs, C. T. and Aubrey, D. G.: Non-linear Well-mixed Tidal Distortion in Shallow Estuaries: a Synthesis, Estuarine, Coast. Shelf Sci., 27, 521–545, 1988.
Genin, A.: The physical setting of the Gulf of Aqaba: an explanation for a unique occurrence of tropical communities in the subtropics, in: Aqaba-Eilat, the Improbable Gulf environment, biodiversity and preservation, edited by: Por, F. D., Magnes Press, 15–20, 2008.
Genin, A. and Paldor, N.: Changes in the circulation and current spectrum near the tip of the narrow, seasonally mixed Gulf of Elat, Isr. J. Earth. Sci., 47, 87–92, 1998.
Genin, A., Lazar, B., and Brenner, S.: Vertical mixing and coral death in the Red Sea following the eruption of Mount Pinatubo, Nature, 377, 507–510, 1995.
Gildor, H., Fredj, E., Steinbuck, J., and Monismith, S.: Evidence for Submesoscale Barriers to Horizontal Mixing in the Ocean from Current Measurements and Aerial Photographs, J. Phys. Oceanogr., 39, 1975–1983, 2009.
Gildor, H., Fredj, E., and Kostinski, A.: The Gulf of Eilat/Aqaba: a natural driven cavity?, Geophy. Astro. Fluid Dyn., 104, 301–308, 2010.
Gurgel, K. W., Antonischki, G., Essen, H. H., and Schlick, T.: Wellen Radar (WERA): a new ground-wave HF radar for ocean remote sensing, Coast. Engin., 37, 219–234, 1999a.
Gurgel, K. W., Essen, H. H., and Kingsley, S. P.: High-frequency radars: physical limitations and recent developments, Coast. Engin., 37, 201–218, 1999b.
Hodgins, D. O.: Remote sensing of ocean surface currents with the SeaSonde HF radar, Spill Sci. Technol. Bull., 1, 109–129, 1994.
Hoitink, A., Hoekstra, P., and Van Maren, D.: Flow asymmetry associated with astronomical tides: Implications for the residual transport of sediment, J. Geophys. Res.-Ocean., 108, 3315, https://doi.org/10.1029/2002JC001539, 2003.
Lee, H.-J., Chao, S.-Y., Fan, K.-L., Wang, Y.-H., and Liang, N.-K.: Tidally induced upwelling in a semi-enclosed basin: Nan Wan Bay, J. Oceanogr., 53, 467–480, 1997.
Lee, H.-J., Chao, S.-Y., and Fan, K.-L.: Flood–ebb disparity of tidally induced recirculation eddies in a semi-enclosed basin: Nan Wan Bay, Cont. Shelf Res., 19, 871–890, 1999a.
Lee, H.-J., Chao, S.-Y., Fan, K.-L., and Kuo, T.-Y.: Tide-induced eddies and upwelling in a semi-enclosed basin: Nan Wan, Estuarine, Coast. Shelf Sci., 49, 775–787, 1999b.
Lekien, F. and Gildor, H.: Computation and approximation of the length scales of harmonic modes with application to the mapping of surface currents in the Gulf of Eilat, J. Geophys. Res., 114, C06024, https://doi.org/1029/2008JC004742, 2009.
Lekien, F., Coulliette, C., Bank, R., and Marsden, J.: Open-boundary modal analysis: Interpolation, extrapolation, and filtering, J. Geophys. Res., 109, C12004, https://doi.org/10.1029/2004JC002323, 2004.
Manasrah, R. S., Al-horani, F. A., Rasheed, M. Y., Al-rousan, S. A., and Khalaf, M. A.: Patterns of summer vertical and horizontal currents in coastal waters of the northern Gulf of Aqaba, Red Sea, Estuar. Coast. Shelf S., 69, 567–579, 2006.
Monahan, A. H.: The Probability Distribution of Sea Surface Wind Speeds, Part I: Theory and SeaWinds Observations, J. Climate, 19, 497–520, 2006.
Monahan, A. H.: The Probability Distribution of Sea Surface Wind Speeds: Effects of Variable Surface Stratification and Boundary Layer Thickness, J. Climate, 23, 5151–5162, 2010.
Monismith, S. G. and Genin, A.: Tides and sea level in the Gulf of Aqaba (Eilat), J. Geophys. Res., 109, https://doi.org/10.1029/2003JC002069, 2004.
Nidzieko, N. J.: Tidal asymmetry in estuaries with mixed semidiurnal/diurnal tides, J. Geophys. Res.-Ocean., 115, https://doi.org/10.1029/2009JC005864, 2010.
Pawlowicz, R., Beardsley, B., and Lentz, S.: Classical tidal harmonic analysis including error estimates in MATLAB using T_TIDE, Comput. Geosci., 28, 929–937, 2002.
Saaroni, H., Maza, E., and Ziv, B.: Summer sea breeze, under suppressive synoptic forcing, in a hyper-arid city: Eilat, Israel, Clim. Res., 26, 213–220, 2004.
Wang, Z., Jeuken, M., Gerritsen, H., De Vriend, H., and Kornman, B.: Morphology and asymmetry of the vertical tide in the Westerschelde estuary, Cont. Shelf Res., 22, 2599–2609, 2002.
Wolf-Vecht, A., Paldor, N., and Brenner, S.: Hydrographic indications of the advection/ convection effects in the Gulf of Eilat, Deep-Sea Res., 39, 1393–1401, 1992.
Short summary
Nan-Wan Bay in Taiwan and the Gulf of Elat in Israel are two different coastal environments, and as such, their currents are expected to have different statistical properties. We find that in spite of these differences, the statistical properties of the surface currents are similar in both basins. Still, surface currents are temporally asymmetric in Nan-Wan but not in Elat; we attribute this difference to the strong tides that exist in Nan-Wan but not in Elat.
Nan-Wan Bay in Taiwan and the Gulf of Elat in Israel are two different coastal environments, and...