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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >A coupled model of the global cycles of carbonyl sulfide and CO _2: A possible new window on the carbon cycle
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A coupled model of the global cycles of carbonyl sulfide and CO _2: A possible new window on the carbon cycle

机译：羰基硫和CO _2全局循环的耦合模型：碳循环的可能新窗口

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Carbonyl sulfide (COS) is an atmospheric trace gas that participates in some key reactions of the carbon cycle and thus holds great promise for studies of carbon cycle processes. Global monitoring networks and atmospheric sampling programs provide concurrent data on COS and CO_2 concentrations in the free troposphere and atmospheric boundary layer over vegetated areas. Here we present a modeling framework for interpreting these data and illustrate what COS measurements might tell us about carbon cycle processes. We implemented mechanistic and empirical descriptions of leaf and soil COS uptake into a global carbon cycle model (SiB 3) to obtain new estimates of the COS land flux. We then introduced these revised boundary conditions to an atmospheric transport model (Parameterized Chemical Transport Model) to simulate the variations in the concentration of COS and CO_2 in the global atmosphere. To balance the threefold increase in the global vegetation sink relative to the previous baseline estimate, we propose a new ocean COS source. Using a simple inversion approach, we optimized the latitudinal distribution of this ocean source and found that it is concentrated in the tropics. The new model is capable of reproducing the seasonal variation in atmospheric concentration at most background atmospheric sites. The model also reproduces the observed large vertical gradients in COS between the boundary layer and free troposphere. Using a simulation experiment, we demonstrate that comparing drawdown of CO _2 with COS could provide additional constraints on differential responses of photosynthesis and respiration to environmental forcing. The separation of these two distinct processes is essential to understand the carbon cycle components for improved prediction of future responses of the terrestrial biosphere to changing environmental conditions. Key PointsCarbonyl sulfide can help falsify carbon cycle modelsCarbonyl sulfide can aid separation of NPP into GPP and RespThe oceanic COS source is probably much larger than currently thought
机译：羰基硫（COS）是一种大气中的微量气体，它参与了碳循环的一些关键反应，因此对碳循环过程的研究具有广阔的前景。全球监测网络和大气采样程序提供了有关植被区自由对流层和大气边界层中COS和CO_2浓度的并发数据。在这里，我们提供了一个用于解释这些数据的建模框架，并说明了COS测量值可以告诉我们有关碳循环过程的信息。我们在全球碳循环模型（SiB 3）中实施了叶片和土壤COS吸收的机理和经验描述，以获得COS土地通量的新估计。然后，我们将这些修正的边界条件引入到大气迁移模型（参数化化学迁移模型）中，以模拟全球大气中COS​​和CO_2浓度的变化。为了平衡全球植被汇相对于之前的基准估计值的三倍增长，我们提出了一个新的海洋COS源。使用简单的反演方法，我们优化了该海洋源的纬度分布，并发现其集中在热带地区。新模型能够再现大多数背景大气点的大气浓度的季节性变化。该模型还重现了边界层和对流层之间在COS中观察到的大垂直梯度。使用模拟实验，我们证明了比较CO _2与COS的压降可以对光合作用和呼吸作用对环境强迫的不同响应提供额外的约束。这两个不同过程的分离对于理解碳循环组成部分至关重要，以便更好地预测地球生物圈对变化的环境条件的未来响应。要点硫化碳可以帮助伪造碳循环模型硫化碳可以帮助将NPP分离为GPP和Resp海洋COS来源可能比目前认为的要大得多

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