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Volume 36 Issue 9
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Article Navigation >  Haiyang Xuebao  > 2014  >  36(9): 94-102
Zhang Xu, Cheng Chen, Liu Yan. Acoustic propagation effect caused by subtropical mode water of northwestern Pacific[J]. Haiyang Xuebao, 2014, 36(9): 94-102. doi: 10.3969.issn.0253-4193.2014.09.011
Citation: Zhang Xu, Cheng Chen, Liu Yan. Acoustic propagation effect caused by subtropical mode water of northwestern Pacific[J]. Haiyang Xuebao, 2014, 36(9): 94-102. doi: 10.3969.issn.0253-4193.2014.09.011
shu

Acoustic propagation effect caused by subtropical mode water of northwestern Pacific

doi: 10.3969.issn.0253-4193.2014.09.011
  • 1.

    Unit 91550 of People’s Liberation Army of China, Dalian 116023, China;Post-doctoral Scientific Research Work Station in 92493 Unit of People’e Liberation Army,Dalian 116023,China

  • 2.

    Unit 91550 of People’s Liberation Army of China, Dalian 116023, China

  • Received Date: 2013-06-15
  • Rev Recd Date: 2013-12-14
    Abstract
  • Acoustical propagation features caused by subtropical mode water (STMW) of Northwestern Pacific during seasonal transition are analyzed by Argo profile data and acoustic numerical model. The results of sound filed show that the main propagating pattern of STMW formed region is a combination of surface or subsurface duct and convergence zone (CZ). The CZ exists all the year round, but the surface duct appears in a growing mixed-layer environment in autumn and winter, and the subsurface duct appears only in a STMW subduction environment in summer. Two types of duct propagation show an inverse pattern of sound energy distribution, and the difference can be around 10 to 15 dB between the internal and the external of the duct (sound frequency is 1 kHz). Seasonal transition of STMW can also lead to the change of CZ positions. The changes are influenced by the source depth. When the source locates at 20 m, the CZ position reaches its furthest in the summer, remains medium in the spring, and arrives its nearest in the winter, where the maximum difference can be 6.6 km. When the source locates at 150 m, the CZ reduces 3.1 km in summer and shows no distinct changes in other seasons.
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