潜标观测的马鲁古海海流和输运

发布时间：2022-11-30 【小】 【中】 【大】 文章来源：
 印尼贯穿流在全球海洋环流和气候变化中起着重要作用。目前对印尼贯穿流的研究主要集中在上层温跃层海流。本文利用布放于马鲁古海峡的四套潜标和利法马托拉海峡的一套潜标的多年海流观测数据，研究了马鲁古海上1200米的平均环流和体积输运收支。结果表明，在60-450米深度范围内，平均流向北流向太平洋，平均流量为2.07-2.60 Sv。在450-1200米深度范围内，流经西马鲁古海的西边界流向南和利法马托拉海峡的南向流相连。马鲁古海峡中东部的平均流在此深度范围内向北，表明马鲁古海中层存在西向强化的逆时针环流。半封闭海盆的位涡积分约束可以解释中层环流的动力机制。体积输运收支分析表明，中层南向西边界流的平均流量为1.83-2.25Sv，由三个流量去向平衡：（1）0.62-0.93Sv通过利法马托拉海峡向南输送到塞兰-班达海；（2）0.97-1.01Sv通过马鲁古海峡中东部返回西太平洋；（3）其余部分被认为会上升到上层，汇入上层北向流返回太平洋。由于马鲁古海是南极中层水通过印尼海流入印度洋的重要入口，本文揭示的水交换过程有助于我们更好地理解南极中层水在马鲁古海中的运移，为全球海洋翻转环流以及与之相关的热量和CO2储存提供新的见解。

 

The Indonesian Throughflow plays an important role in the global ocean circulation and climate variations.  Existing studies of the Indonesian Throughflow have focused on the upper thermocline currents.  The mean circulation and volume budgets in the upper 1200 m of the Maluku Sea are studied using multi-year current meter measurements of four moorings in the Maluku Channel and of one synchronous mooring in the Lifamatola Passage.  The measurements show that the mean current in the depth range of 60 m - 450 m is northward towards the Pacific Ocean with a mean transport of 2.07 Sv - 2.60 Sv.  In the depth range of 450 m - 1200 m, a mean western boundary current (WBC) flows southward through the western Maluku Sea and connects with the southward flow in the Lifamatola Passage.  The mean currents in the central-eastern Maluku Channel are found to flow northward at this depth range, suggesting an anti-clockwise western intensified gyre circulation in the middle layer of the Maluku Sea. The dynamics of the intermediate gyre circulation are explained by the potential vorticity (PV) integral constraint of a semi-enclosed basin. Budget analyses suggest that the mean transport of the intermediate WBC is 1.83 Sv - 2.25 Sv, which is balanced by three transports: (1) 0.62 Sv - 0.93 Sv southward transport into the Seram-Banda Seas through the Lifamatola Passage, (2) 0.97 Sv-1.01 Sv returning to the western Pacific Ocean through the central-eastern Maluku Channel, and (3) a residual transport surplus, suggested to upwell to the upper layer joining the northward transport into the Pacific Ocean.  As the Maluku Sea is an important entrance of the AAIW inflow toward the Indian Ocean, the processes of water exchange revealed in this paper help us understand the AAIW movement in the Maluku Sea better, providing new insight for the global ocean overturn and the heat and CO2 storages associated with it. 


图.马鲁古海中层环流示意图。黑色箭头是2000年至2019年OFES模式模拟的912米处的气候态平均流场。紫色箭头表示中层环流构型，垂向的灰色箭头表示从中层到上层的上升流。


Yin X, Yuan D*, et al. Moored observations of the currents and transports of the Maluku Sea. Journal of Physical Oceanography (ISSN:0022-3670): 2022. DOI: 10.1175/JPO-D-22-0027.1

附件下载：