Change of multifractal thermal characteristics in the western Philippine sea upper layer during internal wave-soliton propagation |
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| Authors: | Peter C Chu Chung-Ping Hsieh |
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| Institution: | (1) Naval Ocean Analysis and Prediction Laboratory, Naval Postgraduate School, Monterey, CA, 93940, U.S.A. |
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| Abstract: | The upper layer (above 140 m depth) temperature in the western Philippine Sea near Taiwan was sampled using a coastal monitoring
buoy (CMB) with 15 attached thermistors during July 28–August 7, 2005. The data were collected every 10 min at 1, 3, 5, 10,
15, and 20 m using the CMB sensors, and every 15 sec at 15 different depths between 25 m and 140 m. Internal waves and solitons
were identified from the time-depth plot of the temperature field. Without the internal waves and solitons, the power spectra,
structure functions, and singular measures (representing the intermittency) of temperature field satisfy the power law with
multi-scale characteristics at all depths. The internal waves do not change the basic characteristics of the multifractal
structure. However, the internal solitons change the power exponent of the power spectra drastically, especially in the low
wave number domain; they also break down the power law of the structure function and increase the intermittency parameter.
The physical mechanisms causing these different effects need to be explored further. |
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| Keywords: | High-order structure function intermittency internal wave internal soliton multifractal analysis power spectrum stationarity singular measure |
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