Long-term measurement of temperature variabilities off Mindanao Island by the ocean acoustic tomography |
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| Authors: | Gang Yuan Iwao Nakao Hidetoshi Fujimori Arata Kaneko |
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| Institution: | (1) Faculty of Engineering, Hiroshima University, 724 Higashi-Hiroshima, Japan;(2) Japan Marine Science and Technology Center, 237 Yokosuka, Japan |
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| Abstract: | Oceanic variabilities off Mindanao Island, Philippines where the North Equatorial Current branches into the Kuroshio and the Mindanao Current were measurerd for a period from 14 Feb.–1 Jun. 1992 by the oceean acoustic tomography (OAT). From the beginning of April, the travel time of acoustic rays propagating over a horizontal distance of about 250km, through the depth range of 80–4700 m around the underwater sound channel began to decrease, implying a warming of water. This variability was also confirmed with the results of temperature measurement at the sites where a sound source and receiver were located. The TOGA/TAO array data show that the OAT experiment was done when the 1991–1992 El Nino was at a decaying stage and the resulting warming-up of water occurred at the western Pacific. This study provides us a first evidence of ENSO-related variabilities detected by the OAT. |
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