Spatial and temporal structure of the Denmark Strait Overflow revealed by acoustic observations
Spatial and temporal structure of the Denmark Strait Overflow revealed by acoustic observations
复制标题
声学观测揭示丹麦海峡溢流的时空结构
DOI：
10.1007/s10236-007-0101-x
复制
发表时间：
2007
期刊：
影响因子：
2.3
通讯作者：
S. Jónsson
中科院分区：
文献类型：
--
作者：
A. Macrander;R. Käse;U. Send;H. Valdimarsson;S. Jónsson
尽管大西洋子午线翻转环流(AMOC)对全球气候稳定起着基础性作用，但直到最近，还没有关于丹麦海峡溢流的直流量测，以解决长时间在基准处的横流结构。自1999年以来，在基床上部署了一系列底部安装的声学仪器，测量水流速度和从底部到表面的声波传播时间。在此，讨论了基于数值溢出模型的阵列结构优化问题。模拟结果表明，80%以上的浓水输送变率是由2~3个声学流速剖面仪(ADCP)捕捉到的。将结果与1999年至2003年部署的ADCP和反向回声测深仪的时间序列进行了比较，证实了底部安装的仪器可以可靠地测量到密集的溢流羽流，并且溢流在基准处基本上是地转平衡的。
In spite of the fundamental role the Atlantic Meridional Overturning Circulation (AMOC) plays for global climate stability, no direct current measurement of the Denmark Strait Overflow, which is the densest part of the AMOC, has been available until recently that resolve the cross-stream structure at the sill for long periods. Since 1999, an array of bottom-mounted acoustic instruments measuring current velocity and bottom-to-surface acoustic travel times was deployed at the sill. Here, the optimization of the array configuration based on a numerical overflow model is discussed. The simulation proves that more than 80% of the dense water transport variability is captured by two to three acoustic current profilers (ADCPs). The results are compared with time series from ADCPs and Inverted Echo Sounders deployed from 1999 to 2003, confirming that the dense overflow plume can be reliably measured by bottom-mounted instruments and that the overflow is largely geostrophically balanced at the sill.