全球气候变化对海洋声吸收系数的影响研究

发布时间：2019-01-06 12:41

【摘要】：基于地球系统模式FIO-ESM(The First Institute of Oceanography-Earth System Model),研究了在最高排放RCP8.5情景下1851—2100年海水温度、盐度和酸度的变化规律,综合考虑三者得到了声吸收系数的变化规律。FIO-ESM模式输出结果表明,1851—2100年间大部分区域的海水温度出现不同程度地上升,海洋酸化现象明显,北极地区附近的海水盐度出现较大程度的下降。利用Francaais-Garriso经验公式计算海洋声吸收系数发现,如果只考虑酸度对声吸收系数的影响,声吸收系数的预报误差将达到40%以上。综合计算结果表明,随着全球气候变化的演进,全球海洋声吸收系数出现不同程度的下降,最大可达70%,即未来的海洋对于声波更加"透明"。
[Abstract]:Based on the Earth system model (FIO-ESM (The First Institute of Oceanography-Earth System Model), the variation of seawater temperature, salinity and acidity in the maximum discharge RCP8.5 scenario from 1851 to 2100 was studied. Considering the three factors, the variation of acoustic absorption coefficient is obtained. The output results of FIO-ESM model show that the seawater temperature in most areas increased in varying degrees during the period from 1851 to 2100, and the ocean acidification phenomenon was obvious. The salinity of sea water near the Arctic region decreased to a large extent. It is found that the prediction error of acoustic absorption coefficient will reach more than 40% if only the influence of acidity on acoustic absorption coefficient is considered by Francaais-Garriso empirical formula. The results show that with the evolution of global climate change, the global acoustic absorption coefficient of the ocean decreases in varying degrees, and the maximum value can reach 70, that is, the future ocean is more "transparent" to sound waves.
【作者单位】：国家海洋局第一海洋研究所;青岛海洋科学与技术国家实验室区域海洋动力学与数值模拟功能实验室;海洋环境科学与数值模拟国家海洋局重点实验室;
【基金】：国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目——海洋环境动力学和数值模拟(U1606405) 中央级公益性科研院所基本科研业务费专项资金资助项目——区域海洋声学预报中不确定性的传递与度量(2015G03)
【分类号】：P733.2

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