Short-term variabilities of upper ocean current in the warm pool region during TOGA/COARE IOP |
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Authors: | Iwao Ueki Kunio Kutsuwada Hideo Inaba Arata Kaneko |
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Institution: | (1) School of Marine Science and Technology, Tokai University, 3-20-1, Orido, 424-8610 Shimizu, Shizuoka, Japan;(2) Department of Environmental Sciences, Faculty of Engineering, Hiroshima University, 739-0046 Higashi-Hiroshima, Japan |
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Abstract: | Oceanic current data in the warm pool region of the western equatorial Pacific measured by upward-looking moored Acoustic
Doppler Current Profilers at two equatorial sites (147°E and 154°E) and two off-equatorial sites (2°N and 2°S, 156°E) during
TOGA/COARE Intensive Observing Period (IOP) from November 1992 to February 1993 are used to examine short-term variabilities
in the upper layer above 160–240 m. In time series of the zonal and meridional currents in many layers, spectral peaks are
found at periods around 2 days and 4 days in addition to high energies in a period range longer than 10 days. The signal with
the period of about 2 days has significantly high energies at all sites, and its magnitude is higher for the meridional current
than for the zonal one. This signal is especially active in the first half of IOP from November to December in 1992. In this
period, the quasi-2-day signal in the current field is coherent between northern (2°N) and southern (2°S) stations, but it
has no evident relationship with that in the surface wind field around the stations. The quasi-4-day signal with the period
of about 4 days has highest energies in layers above 160 m at the southern station, and is coherent between northern and southern
stations. Besides, the signal at the station of 2°S has a significantly high coherence with that in the wind at the southern
station, suggesting that it is a local phenomenon. |
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Keywords: | Warm-pool variabilities oceanic current TOGA/COARE IOP quasi-2-day signal |
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