Increases in deep ocean anibient noise in the northeast pacific west of San Nicolas Island, California
Increases in deep ocean anibient noise in the northeast pacific west of San Nicolas Island, California
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DOI：
10.1121/1.2216565
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发表时间：
2006-08-01
影响因子：
2.4
通讯作者：
Wiggins, Sean M.
中科院分区：
文献类型：
--
作者：
McDonald, Mark A.;Hildebrand, John A.;Wiggins, Sean M.
最近在以前研究过的地点进行的测量表明，过去四十年来，东北太平洋海洋环境噪声增加的幅度。连续测量西部的圣尼古拉斯岛，加州，超过138天，跨越2003-2004年进行比较，在20世纪60年代在同一地点的测量。2003-2004年30-50 Hz的环境噪声水平比1964-1966年高10-12 dB（95% CI=2.6 dB），表明平均噪声增加率为每十年2.5-3 dB。在50 Hz以上，记录周期之间的噪声电平差逐渐减小，在100-300 Hz时仅为1-3 dB。在300赫兹以上，1964-1966年的环境噪声水平高于2003-2004年，这是由于最近的数据中没有昼夜分量。低频（10-50 Hz）海洋环境噪声水平与船舶交通密切相关。1965年至2003年期间，往返于世界各大洋的商业船只数量大约翻了一番，总吨位翻了两番，马力也相应增加。据信，商业航运的增加是观察到的低频环境噪音增加的原因。(c)2006年，美国声学学会。
Recent measurement at a previously studied location illustrates the magnitude of increases in ocean ambient noise in the Northeast Pacific over the past four decades. Continuous measurements west of San Nicolas Island, California, over 138 days, spanning 2003-2004 are compared to measurements made during the 1960s at the same site. Ambient noise levels at 30-50 Hz were 10-12 dB higher (95% CI=2.6 dB) in 2003-2004 than in 1964-1966, suggesting an average noise increase rate of 2.5-3 dB per decade. Above 50 Hz the noise level differences between recording periods gradually diminished to only 1-3 dB at 100-300 Hz. Above 300 Hz the 1964-1966 ambient noise levels were higher than in 2003-2004, owing to a diel component which was absent in the more recent data. Low frequency (10-50 Hz) ocean ambient noise levels are closely related to shipping vessel traffic. The number of commercial vessels plying the world's oceans approximately doubled between 1965 and 2003 and the gross tonnage quadrupled, with a corresponding increase in horsepower. Increases in commercial shipping are believed to account for the observed low-frequency ambient noise increase. (c) 2006 Acoustical Society of America.