While the ocean is 10 times louder now than it was just 50 years ago, a new propeller design promises to roll the noise back. This will make a huge quality difference for the ocean’s inhabitants.
Now we’re getting somewhere!
Tag: acoustics
NOAA Fisheries 2024 “Acoustical Guidance” review.
Proposed “updates” of federal documents are required every five years to make sure the regulations reflect the ‘best available science.’ Predictably the 2024 “Updates” remain at least a decade behind the “best available science…”
2023 Year End Progress Report
As the New Year approaches, it is common to wonder “where did the year go?” But for OCR, oddly, this previous year was thick enough to give us a sense of continuity in transitions, accomplishments, and events.
The many dimensions of Infrasound
The term “Infrasound” is a bit of an anthropocentric misnomer; it refers to sound frequencies below human ability to auditorily distinguish. This doesn’t mean that humans can’t perceive infrasound, it’s just that distinct sounds below a certain frequency may be sensed as beats or flutters.
Scenes from the Acoustical Society meeting in Chicago
None of these animals are merely “response machines;” rather they all have complex, and generally delightful personalities.
Acoustic Tour of Massachusetts Bay
Enjoy this quick overview of sounds in Massachusetts Bay, courtesy of Cornell Lab of Ornithology.
Munching Data
I spent last week “hiding out” in San Francisco at an Acoustical Society of America (ASA) meeting. I’ve been a member and attending these meetings for about fifteen years and have seen both the society and the inquiry evolve much…
Mapping Cetaceans and Sound
Thanks to a number of folks in this august group we were sent a substantial article from Monday’s NY Times about ocean noise pollution. The initiating work discussed in the article is a NOAA sponsored meta-data framework on mapping marine…
Noise impacts on fish and invertebrates workshop
I spent last week in San Diego attending a workshop sponsored by the Bureau of Ocean Energy Management (BOEM) on the impacts of human generated noise on marine fish and invertebrates. Having watched the field of ocean noise impacts roll…
Tracking walrus’ movement using only one ear
A recent paper was published by marine research firm JASCO on localizing walruses using a single hydrophone. The technique they have refined is detailed in the article and involves assessing “multipath signals” – echoes from the sea surface and seafloor…