25 September 2008

Re-tuning the sphere

[Peter Brewer and colleagues] calculated how much [the drop in ocean pH by 0.12 during the 20th century] would affect the absorption of sound waves at 0.44 kHz – the note "A" used to tune an orchestra. They found that by the early 1990s, sound was being absorbed 15% less than in the late 19th century.

Some studies predict ocean pH could drop by an average of 0.3 before the end of this century...The team calculates that this would cause a 40% decrease in the absorption of sounds below 1 kHz.

No comments: