Carbonate-related parameters of subsurface waters in the West Philippine, South China and Sulu Seas
Carbonate-related parameters of subsurface waters in the West Philippine, South China and Sulu Seas
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DOI：
10.1016/j.marchem.2005.05.008
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发表时间：
2006-03
期刊：
影响因子：
3
通讯作者：
C. Chen;W. Hou;T. Gamo;S. Wang
中科院分区：
文献类型：
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作者：
C. Chen;W. Hou;T. Gamo;S. Wang
与东南亚大多数其他深水盆地一样，苏鲁海深水盆地(SS)由于周围的地形与邻近海域隔绝。虽然近地表环流主要受季节性逆转的季风风控制，但在温暖而新鲜的表层以下，可以看到从西菲律宾海经南中国海进入的副热带低层水的核心，在约200m处有明显的盐度极大值。它位于民多罗海峡的基岩深度(420米)之上，因此，它的传播不受地形的阻碍。深部环流是由来自南海的北太平洋中上层水(NPIW)通过Mindoro Str流入的。在1000米以下，它们的物理化学性质非常均匀。与南海相比，SS深水的温度较高，但盐度、氧气和营养物质较低，这表明NPIW在基床深度以上侵入。过量的、人为的二氧化碳穿透了整个水柱，这是因为来自南海的过量的二氧化碳负载水溢出。据报道，相对于南海，SS的底部是富CaCO3的。以前的研究人员将此归因于SS中较高的θ。事实上，文石在南沙低于1400米时才变得不饱和，相比之下，南沙和南海都是600米；方解石在南沙低于3800米时才变得不饱和，而南沙是2500米，南沙约为1600米。但是，温度的影响相对较小。事实上，这些巨大的差异在很大程度上是由于SS中的CO32−浓度高于WPS和南海。悬浮物中CO_2~2-−浓度较高，主要是由于有机碳分解量较少所致。
Like most other deep basins in Southeast Asia, the deep Sulu Sea (SS) basin is isolated from the neighboring seas by surrounding topography. While the near-surface circulation is mainly governed by the seasonally reversing monsoon winds, below the warm and fresh surface layer, the core of the incoming Subtropical Lower Water from the West Philippine Sea (WPS), by way of the South China Sea (SCS), can be seen, at a depth of around 200 m, to have a distinct salinity maximum. It lies well above the sill depth (420 m) in the Mindoro Strait and thus, its spreading is not hampered by topography. The deep circulation is forced by an inflow of upper North Pacific Intermediate Water (NPIW) from the SCS through the Mindoro Str. Below 1000 m, the physico-chemical properties are remarkably homogeneous. The higher temperature, but lower salinity, oxygen and nutrients, of the deep SS waters, compared to those of the SCS, is indicative of the intrusion of NPIW above the sill depth. The excess, anthropogenic CO2penetrates the entire water column, because of the over-spill of the excess CO2-laden water from the SCS. It has been reported that the bottom of the SS is CaCO3rich, relative to the SCS. Previous investigators attribute this to the higher θ in the SS. Indeed, the aragonite does not become undersaturated in the SS until below 1400 m, compared to 600 m in both the WPS and SCS; and the calcite does not become undersaturated until below 3800 m in the SS, compared to 2500 m in the SCS and around 1600 m in the WPS. However, the temperature effect is relatively small. These large differences are, in fact, largely a result of higher CO32−concentrations in the SS, relative to the WPS and SCS. The higher CO32−concentration in the SS, in turn, is mainly caused by the smaller amounts of organic carbon decomposition.