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The soundscape The ocean soundscape is a continuously changing mosaic of sounds that originate from living organisms communication and foraging , natural processes breaking waves, wind, rain, earthquakes , and human activities shipping, construction, and resource extraction. We record ocean sound using a hydrophone, an underwater microphone. Being a good listener Because acoustic information spans a tremendous range of frequencies, we must record sound across a very broad spectrum. Capturing information at the high-frequency end of this range requires that we sample sound very frequently more than , times each second.
This frequent sampling of sound across a broad spectrum generates a tremendous flow of data. Many isolated marine acoustic recording systems rely on battery power and internal data storage. Such systems are limited in how long they can be deployed and in how long they can record each day. This hydrophone does not have these constraints because it is connected to the MARS cabled observatory , which supplies power from shore and high-speed communication to data storage on shore, thereby enabling the hydrophone to record 24 hours a day for long periods of time.
During the hydrophone deployment, the remotely operated vehicle ROV Ventana carried the hydrophone at the front of its tool sled arrow in picture at left down to the MARS node right at nearly meters depth. The arrow in the picture at right shows the hydrophone protruding from its tripod base. The hydrophone was placed 70 meters from the MARS node and was connected to the node by a seafloor cable. Data analysis This little hydrophone generates big data—about 24 terabytes in one year.
Understanding this voluminous and dense data requires a variety of analysis methods — from automated recognition of vocalizations by marine mammals to long-term statistical description of all sounds recorded. Automated methods that sift through the data to detect and classify vocalizations of different species are being developed and applied.
This will allow examination of variations in the presence of different species in the Monterey Bay area, in relation to variations in the environment. In addition to listening to recordings, we can also visually represent the soundscape using a spectrogram. A spectrogram quantifies sound energy as a function of frequency and time.
Research programs at the Monterey Bay Aquarium Research Institute MBARI encompass the entire ocean, from the surface waters to the deep seafloor, and from the coastal zone to the open sea. The need to understand the ocean in all its complexity and variability drives MBARI's research and development efforts. Ocean Soundscape. October 22, July 9, January 11, January 20, February 23, June 22, October 29, October 21, June 8, November 3, May 28, March 29, September 16, April 24, — Starting this week, anyone can eavesdrop on the sounds of the deep sea via a continuous streaming YouTube video that carries live sound from the depths of Monterey Bay.
Listen to examples of sounds from marine mammals and Earth. To explore the soundscape visually, view animations of spectrograms no sound. Now they can listen to the bay as well, using an ultra-sensitive underwater microphone. Science Upper-ocean systems Midwater research Seafloor processes Areas of study Biology Chemistry Geology Ocean acidification Physical oceanography and climate change Past research Research publications.
Technology Solving challenges Taking the laboratory into the ocean Enabling targeted sampling Advancing a persistent presence Emerging and current tools Technology publications Technology transfer.
Products What is happening in Monterey Bay today? Financial reports Guest information Library Making an impact.
Underwater acoustics - Hydrophones - Calibration in the frequency range 0,01 Hz to 1 MHz