Long-range Ocean Acoustic Propagation Experiment (LOAPEX)

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The experiment suspended an acoustic source from the R/V Melville at several locations in the eastern Pacific, and utilized the NPAL assets that were installed by APL-UW during the Acoustic Thermometry of Ocean Climate (ATOC) demonstration.

LOAPEX had three primary scientific objectives:
  1. Study the evolution, with distance (range) of the acoustic arrival pattern and in particular the range and frequency dependence of the spatial and temporal coherence
  2. Determine the effects of the ocean bottom near the NPAL acoustic source located near Kauai, HI
  3. Produce a thermal map of the Northeast Pacific Ocean
  LOAPEX Cruise Report, April 2005

  LOAPEX: Preliminary analysis of source motion and tidal signals (M.S. Thesis)

The seven red dots along the black LOAPEX cruise path indicate locations from which a low-frequency acoustic source was suspended at various depths from the R/V Melville. An eighth position was taken near the Kauai acoustic source. The open circles labeled with alphabetical letters represent permanent hydrophone arrays of the NPAL network. The red diamond represents the area of seamounts that were studied during BASSEX. The yellow dot shows the location of two vertical line arrays. The white lines indicate the geodetic paths between source locations and receivers.

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