Research to the fluctuation of tempreture-normal mode travel time in AEYFI 05

The data acquired from moored sensors and shipboard hydrographic instruments of AEYFI 05(Acoustics Experiment of Yellow Sea Oceanic Front and Internal Waves) are processed.Both of the spa-tial temporal statistical and correlative characteristics to temperature are analyzed,and the sound travel-time statistical character is calculated too.Results indicate that the frequency spectrum of No.1 Normal Mode travel-time fluctuation is qualitatively similar to the one of temperature time sequence near thermocline,and two spectra present ω-β(β≌1.7-1.8) attenuation for f>30cpd,and both include coherent-structures.The mathi-matic relationships between time and sound-speed fluctuation of Normal Mode propagation are given by the Normal Mode perturbation theory which is used to explain the qualitatively relation between two spectra.