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首页> 外文期刊>Atmosphere-ocean >A Model Evaluation of Biological Effects on Seasonal Variation of Air-Sea CO_2 Flux in the Yellow and East China Seas
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A Model Evaluation of Biological Effects on Seasonal Variation of Air-Sea CO_2 Flux in the Yellow and East China Seas

机译：黄海和东海海气CO_2通量季节变化的生物效应模型评价

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摘要

Based on a coupled physical-biogeochemical model of the Yellow and East China Seas (YECS), the influence of biological activity on the seasonal variation of the air-sea CO2 flux is evaluated. The solution of a sensitivity experiment that excludes biological activity is compared with that of a reference experiment that includes the full processes. The comparison reveals that biological activity results in a much stronger seasonal variation of surface dissolved inorganic carbon (DIC) and, hence, the ratio of total alkalinity to DIC in the northern parts of the YECS. The increased ratio resulting from biological DIC consumption contributes to the undersaturated partial pressure of CO2 at the sea surface with respect to the atmosphere, causing the central Yellow Sea in summer and autumn to shift from being a CO2 source to a sink; this same shift also occurs over the Changjiang Bank in summer. In the southern YECS, the biological effect is relatively weak. The comparison further reveals that low water temperature, instead of biological activity, is the dominant factor causing the YECS to become a carbon sink in spring. The biological effect on the variation of DIC (both at the surface and in the water column) differs greatly among the three representative regions of the YECS because of differences in primary production and hydrodynamic conditions. Particle-tracking simulations quantify the regional difference in horizontal advection. In the northern region, weaker horizontal advection causes the longer residence time of low DIC water induced by biological consumption. Over the entire YECS, biological activity contributes to about one-third of the total annual absorption of atmospheric CO2.
机译：基于黄海和东海的物理-生物地球化学耦合模型，评估了生物活性对气-海CO2通量季节变化的影响。将排除生物活性的敏感性实验的解决方案与包括整个过程的参考实验的解决方案进行比较。比较表明，生物活性导致表面溶解的无机碳（DIC）的季节变化更加强烈，因此，在YECS的北部，总碱度与DIC之比。生物DIC消耗导致比率增加，导致海面相对于大气的CO2饱和分压降低，导致夏季和秋季的黄海中部地区从CO2来源转变为汇。夏季，长江银行也会发生同样的变化。在南部的YECS中，生物学作用相对较弱。比较还进一步表明，低水温而不是生物活性是导致YECS成为春季碳汇的主要因素。在YECS的三个代表性区域之间，对DIC（在表面和在水柱中）变化的生物学影响差异很大，这是因为初级生产和流体动力条件不同。粒子跟踪模拟量化了水平对流中的区域差异。在北部地区，水平对流较弱会导致由生物消耗引起的低DIC水的滞留时间更长。在整个YECS中，生物活性占大气CO2年吸收总量的三分之一。

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