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首页> 外文期刊>Journal of oceanography >Accumulation and Export of Dissolved Organic Carbon in Surface Waters of Subtropical and Tropical Pacific Ocean
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Accumulation and Export of Dissolved Organic Carbon in Surface Waters of Subtropical and Tropical Pacific Ocean

机译：亚热带和热带太平洋地表水中溶解性有机碳的积累和出口

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摘要

Dissolved organic carbon (DOC) concentrations in surface waters of the Pacific Ocean during October–November, 1995, were determined using a high-temperature combustion method. The DOC in the surface mixed-layer was approximately homogeneous with a concentration between 55 and 89 μmol C l?1. This homogeneity indicates that there is a strong control of the vertical distribution of DOC by mixing processes. The DOC concentrations in the mixed-layer in the subtropical region were up to 27 μmol C l?1 higher than in the tropical region. This difference reflects the subtropical accumulation and the tropical export of DOC. There is a significant positive correlation between DOC and chlorophyll a concentrations in the mixed-layer of the North Pacific subtropical region, suggesting that phytoplankton is the primary source of DOC accumulated in this region. Calculations using simple box models suggest that DOC export in the tropical region (0–50 m depth, 10°N-10°S, along 160°W) occurs primarily by poleward advection at a rate of 0.5–3 mmol C m?2day?1. A comparison with estimates of the export rate of particulate organic carbon published in previous studies leads us to conclude that DOC export may contribute less to the carbon budget in the tropical region than has recently been supposed.
机译：使用高温燃烧法测定了1995年10月至11月太平洋海洋表层水中的溶解有机碳（DOC）浓度。表面混合层中的DOC大致均匀，浓度在55至89μmolC l？1之间。这种均质性表明通过混合过程可以很好地控制DOC的垂直分布。亚热带地区混合层的DOC浓度比热带地区高27μmolC l？1。这种差异反映了DOC的亚热带积累和热带出口。在北太平洋亚热带地区的混合层中，DOC与叶绿素a浓度之间存在显着的正相关，这表明浮游植物是该区域中DOC积累的主要来源。使用简单箱形模型进行的计算表明，在热带地区（0–50 m深度，10°N-10°S，沿160°W），DOC的出口主要通过极向平流进行，速率为0.5–3 mmol C m？2day。 1。与先前研究中公布的颗粒状有机碳出口率估算值的比较得出的结论是，DOC出口对热带地区碳预算的贡献可能比最近的预期要少。

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