| ZHOU Shengqi,QU Ling,ZHAO Xiaozheng,WAN Wei. 2014. Laboratory simulation of the influence of geothermal heating on the interior ocean. Acta Oceanologica Sinica, 33(9):25－31 |
| Laboratory simulation of the influence of geothermal heating on the interior ocean |
| 地热对海洋影响的实验室模拟 |
| Received:April 05, 2013 Revised:January 23, 2014 |
| DOI：10.1007/s13131-014-0512-8 |
| Key words:geothermal heating oceanic circulation turbulent mixing temperature velocity |
| 中文关键词: 地热流 大洋环流 湍流混合 温度 速度 |
| 基金项目:The National Natural Science Foundation (NSF) of China under contract Nos 41176027 and 11072253; the Strategic Priority Research Program of the Chinese Academy of Sciences under contract No. XDA11030302; the State Key Laboratory of Tropical Oceanography (LTO) grant, South China Sea Institute of Oceanography, Chinese Academy of Sciences, under contract No. LTOZZ1304. |
| Author Name | Affiliation | E-mail | | ZHOU Shengqi | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | sqzhou@scsio.ac.cn | | QU Ling | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | ZHAO Xiaozheng | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China | | | WAN Wei | State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
University of Chinese Academy of Sciences, Beijing 100049, China | |
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| Abstract: |
| This study, using laboratory experiments and scaling analysis, evaluates the influence of geothermal heating on global oceanic circulation. Upon a well-developed large-scale convective flow, an additional heat flux perturbation δF/F is employed. The increments of flow and thermal properties, including eddy diffusivity KT, flow velocity V and bottom temperature Tb, are found to be independent of the applied heat flux F. Together with the scaling analysis of convective flow at different configurations, where the flow is thermally driven in the relatively low or extremely high turbulent thermal convections or the horizontal convection, the variances of flow properties, δKT/KT and δV/V, are found to be close to 0.5% and 0.75% at δF/F=2%. This means that the small heat flux perturbation plays a negligible role in the global convective flow. However, δTb/ΔT is found to be 1.5% at δF/F=2%, which would have a significant effect in the local region. The results might provide a clue to understanding the influence of geothermal heating on global oceanic circulation. It is expected that geothermal heating will contribute less than 1% in turbulent mixing and volume flux to global oceanic circulation, so its influence can be negligible in this situation. However, when it comes to the local environment, the influence of geothermal heating cannot be ignored. For example, temperature increases of about 0.5℃ with geothermal heating would have a significant effect on the physical environments within the benthic boundary layer. |
| 中文摘要: |
| 通过室内实验和标度律分析的方法，评估了地热对海洋环流的影响。对实验室内形成的充分发展大尺度环流，在其底部加入小的热通量扰动δF/F，测量环流的流动和热力学参量变化。实验结果表明涡扩散系数，KT环流速度V和底边界温度Tb的变化与所加热通量δF/F无关，但依赖于热通量扰动 的变化。同时在较低和极端高湍流度的湍动热对流和水平对流三种不同流动环境下，分析了环流的传热和流动标度律。室内实验和标度律分析两种方法的结果表明在δF/F=2%的情况下，涡扩散系数δKT和速度δV/V的相对变化量分别接近0.5% 和 0.75%. 这意味着小热通量扰动对整体环流的影响很小。但是在δF/F=2%的情况下，底边界温度δKT/△T的相对变化量接近1.5%，这会对局域环境有很大影响。当本实验的研究规律应用于海洋，可帮助理解海底地热对大洋环流的作用。推测海底地热对大洋环流的影响很小，湍流混合和体积通量的变化小于1%。但是地热对于局部海洋的影响不容忽视。例如，有没有地热，海底温度会有0.5度的变化，这么大的变化会对海底边界层的物理环境有显著的影响。 |
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