This will allow the establishment of consistent, scientifically based standards and monitoring programs for
ocean noise levels, Nowacek said.
Yet in recent decades, anthropogenic
ocean noise levels have risen markedly — doubling every decade for the past 50 years, according to research by scientists at Scripps Whale Acoustic Lab.
Not exact matches
Another question is for the
noise - forcing mechanism, whether the high frequency forcing will change or whether the state at which the
ocean becomes sensitive to such forcing will be altered (eg «charging» at a different rate or reaching «charged
level» at a different threshold).
To contend with the ever increasing
level of
noise in the
oceans, North Atlantic right whales have recently learned to yell in louder voices to each other.
Of particular concern are the ever increasing
levels of
ocean noise and toxic contaminants which for the most part remain poorly measured let alone managed.
As Game and
Level Designer for this game about whales and the
ocean I got the chance to do tons of research on humpback whales, their navigation, digestion, and human interference like
noise pollution, whale hunting, and more.
The aim of my post is: with poor resolution data (temporal
noise due to multi-year oscillations, geographical
noise from local
ocean level increases / decreases etc.) any claim of a clear signal is dubious.
Note that this sampling
noise in the tide gauge data most likely comes from the water sloshing around in the
ocean under the influence of winds etc., which looks like sea -
level change if you only have a very limited number of measurement points, although this process can not actually change the true global - mean sea
level.
Another question is for the
noise - forcing mechanism, whether the high frequency forcing will change or whether the state at which the
ocean becomes sensitive to such forcing will be altered (eg «charging» at a different rate or reaching «charged
level» at a different threshold).
that some
level of statistical significance can be achieved for periods shorter than 30 years, but not 15 years because fluctuations in things like solar +
ocean - atmosphere heat exchange make it hard to say with high confidence what's signal and what's
noise.
Lead researcher, Rosalind Rolland, of the New England Aquarium, in Boston, America, says, «We showed whales occupying
oceans with high
levels of ship
noise have a chronic stress response.
However, if a 5 dBA to 8 dBA increase in sound due to the proximity of the
ocean were assumed and an additional + / − 3dBA were included to account for model uncertainties,
noise levels may exceed 45 dBA.
With sounds traveling farther, the
level of
noise in the
ocean will increase, Hester and his colleagues found in their study, detailed in the Oct. 1 issue of the journal Geophysical Research Letters.