Scripps Institution of Oceanography, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0205, USA.
J Acoust Soc Am. 2012 Jan;131(1):104-103. doi: 10.1121/1.3664096.
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.
从 2006 年 9 月至 2009 年 6 月，一个自主式声记录仪在阿拉斯加巴罗以北的大陆坡上 235 米深处的楚科奇海和波弗特海之间测量了环境噪声。选择排除脉冲事件的月平均频谱水平表明，有开阔水域的月份噪声水平最高（20-50 Hz 处的 1 μPa(2)/Hz 下为 80-83 dB），有冰覆盖的月份频谱水平较低（50 Hz 处为 70 dB），有冰覆盖和低风速的月份噪声水平最低（50 Hz 处为 65 dB）。在冬季和春季的冰盖期间，由于冰破裂事件，10-100 Hz 之间存在显著的瞬态能量。在春季后期的冰盖期间，瞬态事件明显减少。环境噪声随风速增加约 1 dB/m/s（相对开阔水域为 0%-25%冰盖）和约 0.5 dB/m/s（近完全冰盖 > 75%）。在所有年份的 9 月和 10 月初，由于楚科奇海和波弗特海的地震调查，平均噪声水平升高了 2-8 dB。
