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首页> 外文期刊>Tellus, Series B. Chemical and Physical Meteorology >Is there a 'continental shelf pump' for the absorption of atmospheric CO2?
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Is there a 'continental shelf pump' for the absorption of atmospheric CO2?

机译：是否有用于吸收大气中CO2的“大陆架泵”？

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Based on the results obtained in the East China Sea, we propose a new term, Continental Shelf Pump, as a mechanism for the absorption of atmospheric CO2. We investigated the carbonate system of the East China Sea along a single observation line traversing its central part on 5 cruises in various seasons. The directly observed fugacity of CO2 dissolved in the surface water decreased with decreasing salinity and temperature as well as nutrient content. The relation has been expressed as a simple equation of these 3 parameters. Putting the observed data on the parameters in the various parts of the East China Sea in various months into this equation, we have obtained 55 +/- 5 ppm as an annual mean fugacity deficit of CO2 in the surface water of the East China Sea, which nearly equals the directly measured mean fugacity along the observation line. The net absorption flux estimated from the fugacity deficit has agreed with the amount of carbonate transported out of the East China Sea calculated for the distributions of total dissolved carbonate and alkalinity. The distributions of density and total dissolved carbonate reveal the cause of this large deficiency, described as follows. The shallower shelf zone is more cooled than the open sea when heat is lost from the surface. This cooling produces denser water, which together with photosynthetic activity, accelerates the absorption of CO2 in the shelf zone. The absorbed CO2 is transformed to organic carbon and regenerated especially at the shallow bottom. Isopycnal mixing (advection and diffusion) transports the denser coastal water, especially the bottom water enriched in dissolved and particulate carbon, into the subsurface layer of the open oceans. The transport continues in the layer below the pycnocline even in the warm season and maintains the low fugacity of CO2 in the surface water of the shelf zone. This is the continental shelf pump. The pump would account for a net oceanic uptake of CO2 of 1 GtC/yr, if the world continental shelf zone would absorb the atmospheric CO2 at the rate observed in the East China Sea. [References: 39]
机译：根据在东海获得的结果，我们提出了一个新的术语大陆架泵，作为吸收大气中二氧化碳的一种机制。我们在不同季节进行的5次航行中，沿着一条横跨东海中部的观测线对东中国海的碳酸盐系统进行了调查。直接观察到的溶解于地表水中的二氧化碳逸度随盐度和温度以及养分含量的降低而降低。该关系已表达为这三个参数的简单方程式。将东海各地区不同月份的参数观测数据代入该方程式，我们得出东海地表水中CO2的年平均逸度赤字为55 +/- 5 ppm，几乎等于沿观测线直接测量的平均逸度。根据逸度赤字估算的净吸收通量与从东海运出的碳酸盐量一致，该碳酸盐量是根据总溶解碳酸盐和碱度的分布计算得出的。密度和总溶解碳酸盐的分布揭示了这种严重不足的原因，如下所述。当热量从表层散失时，较浅的架子区域比公海更凉爽。这种冷却产生了更浓的水，这些光与光合作用一起促进了货架区CO2的吸收。吸收的CO2转化为有机碳，尤其在浅层底部再生。等渗混合（对流和扩散）将较稠密的沿海水，特别是富含溶解的碳和颗粒碳的底水，输送到大洋的地下层。即使在温暖的季节，这种运输过程也持续在比考克林以下的层中进行，并保持了架子区地表水的低逸度。这是大陆架泵。如果世界大陆架地区将以东海观测到的速率吸收大气中的二氧化碳，那么该泵将导致海洋净二氧化碳吸收量达到1 GtC /年。 [参考：39]

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