Propagation of airgun pulses in Baffin Bay 2012

Danuta Maria Wisniewska, Line Kyhn, Jakob Tougaard, Malene Simon, Ying-Tsong Lin, Woods Oceanogra, Kristian Beedholm, Woods Oceanogra, Peter Teglberg Madsen

Publikation: Bog/rapportRapportForskning

Abstrakt

In 2012 one 2D and three 3D seismic surveys were simultaneously conducted in
Baffin Bay, West Greenland. The surveys were monitored using 21 acoustic
dataloggers deployed in and around the seismic sites and CTD data were collected
throughout the seismic season. These environmental data together with bathymetry
measurements collected by the seismic vessels were fed into an advanced 3D sound
propagation model to investigate the propagation of airgun pulses in Arctic Waters.
Results of the model were verified using the acoustic recordings. They showed that
the propagation conditions in Baffin Bay were highly complex with areas of lower
than expected transmission loss resulting in higher than anticipated noise levels. The
airgun pulses contained energy up to at least 48 kHz. The noise level in between
seismic pulses did not fade to background levels before arrival of the next pulse and
new pulses are emitted every ten seconds for each survey, which resulted in very few
and short breaks without airgun blasts. On a minute by minute basis the background
noise level increased on average 20 dB, but at times up to 70 dB above pre-exposure
level. The implications of these findings for marine mammals in the Baffin area are
discussed.
OriginalsprogEngelsk
ForlagAarhus University, DCE – Danish Centre for Environment and Energy
Vol/bind109
Antal sider150
ISBN (Trykt)978-87-7156-084-8
ISBN (Elektronisk)2245-0203
StatusUdgivet - aug. 2014

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