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Spatial and temporal variations of particulate organic carbon in the Yellow-Bohai Sea over 2002–2016

机译:2002-2016年黄渤海颗粒有机碳的时空变化

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The Yellow-Bohai Sea (YBS) is a typical marginal sea in the Northwest Pacific Ocean; however, little is known about the dynamics of particulate organic carbon (POC) and underlying mechanisms. Here, we analyze the spatial and temporal variations of surface POC derived from MODIS-Aqua during 2002–2016. Overall, POC is higher in the Bohai Sea (315–588?mg?m?3) than in the Yellow Sea (181–492?mg?m?3), and higher in the nearshore than in the offshore. Surface POC is highest in spring in the YBS, and lowest in winter (summer) in the Bohai Sea (the Yellow Sea). The spatial and seasonal patterns of POC are due to combined influences of primary productivity, water exchange, sediment resuspension and terrestrial inputs. Surface POC shows an overall decreasing trend prior to 2012 followed by an upward trend until 2015 in the YBS, which is almost opposite to chlorophyll; the decrease (increase) may result from strengthened (weakened) water exchange with the East China Sea through the Yellow Sea Warm Current. Declined terrestrial runoff is also partly responsible for the decrease prior to 2012. Our study suggests that water exchange and sediment resuspension are dominant factors regulating the spatial and temporal variability of POC in the YBS.
机译:黄渤海(YBS)是西北太平洋的典型边缘海;然而,对于颗粒有机碳(POC)的动力学及其潜在机理知之甚少。在这里,我们分析了2002-2016年间从MODIS-Aqua得出的地表POC的时空变化。总体而言,渤海的POC较高(315-588?mg?m?3),高于黄海(181-492?mg?m?3),近岸的也高于近海。 YBS春季的地面POC最高,而渤海(黄海)的冬季(夏季)最低。 POC的空间和季节格局归因于初级生产力,水交换,沉积物重悬和地面投入的综合影响。 YBS的表面POC总体呈下降趋势,YBS呈上升趋势直至2015年,几乎与叶绿素相反。减少(增加)可能是由于通过黄海暖流与东海的水交换增加(减弱)引起的。地表径流的下降也是造成2012年之前下降的部分原因。我们的研究表明,水交换和沉积物再悬浮是调节YBS中POC时空变化的主要因素。

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