The soundscape of the Northeast Pacific Ocean is studied with emphasis on frequencies in the range 63–125 Hz. A 34-year (1964–1998) increase and seasonal fluctuations (1994–2006) are investigated. This is achieved by developing a simple relationship between the total radiated power of all ocean sound sources and the spatially averaged mean-square sound pressure in terms of the average source factor, source depth, and sea surface temperature (SST). The formula so derived is used to predict fluctuations in the sound level in the range 63–125 Hz with an amplitude of 1.2 dB and a period of 1 year associated with seasonal variations in the SST, which controls the amount of sound energy trapped in the sound fixing and ranging (SOFAR) channel. Also investigated is an observed 5 dB increase in the same frequency range in the Northeast Pacific Ocean during the late 20th century [Andrew, Howe, Mercer, and Dzieciuch (2002). ARLO 3, 65–70]. The increase is explained by the increase in the total number of ocean-going ships and their average gross tonnage.

中文翻译：

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温度驱动的季节性平均和长期变化，频率为63–125 Hz，在空间平均的深海环境声音中

对东北太平洋的声景进行了研究，重点是63-125 Hz范围内的频率。调查了34年（1964-1998年）的增长和季节性波动（1994-2006年）。通过建立所有海洋声源的总辐射功率与空间平均均方声压之间的简单关系（就平均源因子，源深度和海面温度（SST）而言），可以实现这一点。这样得出的公式可用于预测63-125 Hz范围内的声级波动，其振幅为1.2 dB，持续时间为1年，与SST的季节性变化有关，从而控制了SST中捕获的声能量。声音固定和测距（SOFAR）通道。2002）。ARLO 3，65-70]。增长的原因是远洋船舶总数及其平均总吨位的增加。