Effect of ocean interannual variability on acoustic propagation in the Philippine Sea and South China Sea
Yudono, Albert Mahendro
Chu, Peter C.
MetadataShow full item record
Effect of interannual variability of temperature and salinity on acoustic propagation in the Philippine Sea and South China Sea is investigated using the Navy's climatological (T, S) dataset [i.e., Generalized Digital Environmental Model (GDEM)] and the Synoptic Monthly Gridded World Ocean Database (SMG-WOD) data from January 1960 to December 2014, and an open source acoustic model (BELLHOP). The multi-year averaged monthly (T, S) profiles calculated from the SMG-WOD agree quite well with the GDEM with slight difference in upper layers, especially in thermoclines. The interannual variability of the transmission loss (TL) is identified using the BELLHOP model with the sound speed profiles calculated from the SMG-WOD and GDEM. Less TL was found in the convergence paths modelled from the SMG-WOD. Interannual (3-7 years) variabilities were found in each decade. The TL does not show strong interannual variabilities over the convergence paths; however, the interannual variability will affect the TL between the convergence paths, in the formation of surface duct, sound channels and bottom bounce. The SMG-WOD data is more suitable to assess the interannual variability effect on the acoustic propagation.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Inter-annual variability of the acoustic propagation in the Mediterranean Sea identified from a synoptic monthly gridded database as compared with GDEM Kucukosmanoglu, Murat (Monterey, California. Naval Postgraduate School, 2016-12);The primary area of this research is to identify inter-annual variability of acoustic propagation in the Mediterranean Sea through comparison of sound speed profiles obtained from the synoptic monthly gridded World Ocean ...
Brady, Brian James (Monterey, California. Naval Postgraduate School, 1984-09); NPS-68-84-015Horizontal and vertical thermal structures were examined in a region of the Northeastern Pacific Ocean off Northern California. The observations were acquired on three cruises as part of the ONR-sponsored Ocean Prediction ...
Low-Frequency Variability of the Yellow Sea Cold Water Mass Identified from the China Coastal Waters and Adjacent Seas Reanalysis Chu, Peter C.; Li, Xuewei; Wang, Xidong; Zhao, Dongliang (Hindawi Publishing Corporation, 2015);This study uses the China Coastal Waters and Adjacent Seas Reanalysis (CORA) data to investigate the interannual and decadal variability of the Yellow Sea cold water mass (YSCWM) and its relationship to climate indices ...