Underwater ambient noise on the Chukchi Sea continental slope from 2006-2009.
Underwater ambient noise on the Chukchi Sea continental slope from 2006-2009.
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DOI：
10.1121/1.3664096
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
Ethan H. Roth;J. Hildebrand;S. Wiggins;D. Ross
中科院分区：
文献类型：
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作者：
Ethan H. Roth;J. Hildebrand;S. Wiggins;D. Ross
从2006年9月到2009年6月，在楚科奇海和波弗特海之间235米深的阿拉斯加巴罗北部的大陆斜坡上，一台自动声学记录仪测量了环境噪声。排除脉冲事件后的月平均频谱水平显示，开放水域月份的噪声水平最高（80 ~ 83 dB re: 1 μPa(2)/Hz, 20 ~ 50 Hz），冰雪覆盖月份的噪声水平较低（70 dB, 50 Hz），冰雪覆盖和低风速月份的噪声水平最低（65 dB, 50 Hz）。在冬春冰封期，冰破裂事件产生的瞬态能量在10 ~ 100hz之间。在晚春冰雪覆盖期间，瞬态事件明显减少。对于相对开放的水域（0% ~ 25%冰盖），环境噪声随风速增加约1 dB/m/s，对于几乎完全冰盖（> 75%），环境噪声随风速增加约0.5 dB/m/s。在所有年份的9月和10月初，由于在楚科奇海和波弗特海进行地震调查，平均噪声水平升高了2-8 dB。
From September 2006 to June 2009, an autonomous acoustic recorder measured ambient noise north of Barrow, Alaska on the continental slope at 235 m depth, between the Chukchi and Beaufort Seas. Mean monthly spectrum levels, selected to exclude impulsive events, show that months with open-water had the highest noise levels (80-83 dB re: 1 μPa(2)/Hz at 20-50 Hz), months with ice coverage had lower spectral levels (70 dB at 50 Hz), and months with both ice cover and low wind speeds had the lowest noise levels (65 dB at 50 Hz). During ice covered periods in winter-spring there was significant transient energy between 10 and 100 Hz from ice fracture events. During ice covered periods in late spring there were significantly fewer transient events. Ambient noise increased with wind speed by ~ 1 dB/m/s for relatively open-water (0%-25% ice cover) and by ~ 0.5 dB/m/s for nearly complete ice cover (> 75%). In September and early October for all years, mean noise levels were elevated by 2-8 dB due to the presence of seismic surveys in the Chukchi and Beaufort Seas.