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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Temporal Change of Export Production at Xisha of the Northern South China Sea
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Temporal Change of Export Production at Xisha of the Northern South China Sea

机译：南海西沙出口产量的时间变化

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Physical-biological interaction within the upper ocean influences fixed organic carbon with various efficiencies leading to spatial and temporal change of carbon export in the ocean, which is important for global biogeochemical dynamics but is inadequately understood in the northern South China Sea (NSCS). Here the temporal variations of primary and export production are investigated using a 1-D physical-biogeochemical coupling model at a pelagic station of Xisha (XS) in the NSCS. At this station, the model reproduces the satellite sea surface observations, the depth-integrated primary production, and the sinking flux of particulate organic carbon at 500m from a moored sediment trap. By synthesizing these results, we investigate the long-term dynamics of the biological pump with the focus on export production. We compared our results at XS with that at A Long-Term Oligotrophic Habitat Assessment (ALOHA) in the North Pacific subtropical gyre. While the surface export at XS is greater than ALOHA, the stronger subsurface remineralization at XS has resulted in a similar week biological pump as ALOHA. The high surface export and subsurface flux attenuation at XS are caused by its physical dynamics that support a stronger upward nitrate flux than ALOHA. We also find a time lag of about 20days between primary production and export production at XS, which has led to the large variability of export ratios in the subsurface layers. Further analyses suggest that the temporal variations of primary and export productions are largely driven by the change of turbulent mixing and Ekman pumping that control the vertical nutrient fluxes into the upper ocean.
机译：上海洋内的物理生物相互作用影响固定有机碳，各种效率导致海洋中碳出口的空间和时间变化，这对于全球生物地球化学动态至关重要，但南海北海（NSCs）是不充分的。在这里，使用NSCS在Xisha（XS）的一站式Pelagic站中的1-D物理生物地球化学耦合模型来研究初级和出口生产的时间变化。在该站，该模型再现卫星海面观察，深度集成的初级生产和颗粒有机碳的下沉通量，从系泊沉积物陷阱处以500米。通过综合这些结果，我们研究了生物泵的长期动态，重点是出口生产。我们将结果与XS的结果进行了比较，在北太平洋亚热带孢子的长期寡营栖息地评估（Aloha）。虽然Xs的表面出口大于Aloha，但XS的较强的地下再矿化导致类似的一周生物泵作为Aloha。 XS的高表面导出和地下通量衰减是由其物理动态引起的，其支持比Aloha更强的向上硝酸盐通量。我们还在XS的主要生产和出口生产之间发现了大约20天的时间滞后，这导致了地下层的出口比率的大幅变化。进一步的分析表明，主要和出口制作的时间变化在很大程度上是通过控制垂直营养素流入上海的湍流混合和ekman泵的变化来驱动。

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