Upwelling velocity and ventilation in the western South China Sea deduced from CFC-12 and SF6 observations
Upwelling velocity and ventilation in the western South China Sea deduced from CFC-12 and SF6 observations
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根据CFC-12和SF6观测推导出南海西部上升流速度和通风量
DOI：
10.1357/002224021834614434
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发表时间：
2021
影响因子：
0.5
通讯作者：
Hongwei Ke
中科院分区：
文献类型：
--
作者：
Weimin Wang;Peng Huang;Hengxiang Deng;Mian Chen;Minggang Cai;Zhiyou Jing;Shihao Luo;Xuehong Zheng;Chunhui Wang;Hongwei Ke
本文介绍了2015年秋季南海西部海域瞬态示踪剂CFC-12和SF6的观测结果。在南海西部次表层（150 - 200 m）发现了CFC-12的最大值，并可追溯到北部。太平洋热带水域通过时间分布方法被用来估计在该地区的通风时间。使用CFC-12/SF6示踪剂对获得了0.5的约束Δ/Γ比。该比率低于先前使用的经验单位比率1。估算南海西部北部的沃茨比南部的沃茨年轻。沿15 º N线（图中红色虚线矩形标记），与盐度最低值对应的水团的平均年龄为沿着67 ± 16年。沿沿着10度线（图1，蓝色虚线矩形），增加到76 ± 18年。平均年龄偏高，表明中层水来自远离南海的北太平洋。铁路超高的列清单。为31.3 mol Cm-2。利用示踪剂资料计算出的上升流速度可达1.55 × 10 - 5m s-1，表明不受人为扰动影响的无示踪剂水可被上升流带到上层。利用瞬态示踪剂的传播时间分布导出的平均年龄提供了一种可能的方法来确定研究区域的通风时间尺度。
This study presents observations of the transient tracers CFC-12 and SF6 in the western South China Sea during the fall of 2015. A CFC-12 maximum was discovered in the western South China Sea at the subsurface layer (150–200 m), which could be traced back to the North. Pacific Tropical Water. The transit time distribution approach was used to estimate the ventilation time in this area. The constrained Δ /Γ ratio of 0.5 was obtained using CFC-12/SF6 tracer pair. This ratio is lower than the empirical unit ratio of one as used for previous. estimates. Waters in the northern region of the western South China Sea appear younger than waters in the southern region. The water mass corresponding to the salinity minimum has a mean age of ∼67 ± 16 years along the 15º N line (marked by the red dashed rectangle in Fig.. 1), which increases to ∼76 ± 18 years along the 10º N line (blue dashed rectangle, Fig. 1). The higher mean ages indicate that the intermediate water was ventilated from the North Pacific, which is far distant from the South China Sea. The column inventory of Cant. is ∼31.3 mol C m–2. Upwelling velocities of up to ∼55 × 10–5 m s–1 was computed using the tracer data, indicating that tracer-free water as yet not influenced by human perturbation could be carried to the upper layer by upwelling.. Using the transit time distribution derived mean age with transient tracers provides a possible way to determine the ventilation time scale for the study area.