Winter weather controls net influx of atmospheric CO2 on the north-west European shelf.
Winter weather controls net influx of atmospheric CO2 on the north-west European shelf.
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冬季天气控制着西北欧大陆架大气中二氧化碳的净流入。
DOI：
10.1038/s41598-019-56363-5
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发表时间：
2019
影响因子：
4.6
通讯作者：
Kitidis V
中科院分区：
文献类型：
--
作者：
Kitidis V
陆架海在全球碳循环中发挥着重要作用，吸收大气中的二氧化碳（CO2），并将碳（C）输出到公海和沉积物中。这些过程的大小受到很差的约束，因为观测通常是在多年内插的。在这里，我们使用了298500个来自一年（2015年）的CO2逸度（fCO2）观测值，以估计开放的西北欧洲大陆架上大气CO2的净流入量为26.2 ± 4.7 Tg C yr− 1。从大气中的CO2流入量占主导地位的流入在冬季作为一个结果的大风，尽管一个较小的，热驱动的，海气fCO2梯度相比，较大的，生物驱动的夏季梯度。为了了解这种气候调节服务，我们构建了一个碳预算，并辅以文献中的数据，其中西北欧洲大陆架被视为一个盒子，碳进入和离开盒子。这一收支表明，净碳埋藏是一个1.3 ± 3.1 Tg C yr−1的小汇，而从河口到大气的CO2排放去除了大部分河流碳输入。相比之下，来自波罗的海的输入可能通过大陆架泵和平流（34.4 ± 6.0 Tg C yr−1）贡献净输出。
Shelf seas play an important role in the global carbon cycle, absorbing atmospheric carbon dioxide (CO2) and exporting carbon (C) to the open ocean and sediments. The magnitude of these processes is poorly constrained, because observations are typically interpolated over multiple years. Here, we used 298500 observations of CO2fugacity (fCO2) from a single year (2015), to estimate the net influx of atmospheric CO2as 26.2 ± 4.7 Tg C yr−1over the open NW European shelf. CO2influx from the atmosphere was dominated by influx during winter as a consequence of high winds, despite a smaller, thermally-driven, air-sea fCO2gradient compared to the larger, biologically-driven summer gradient. In order to understand this climate regulation service, we constructed a carbon-budget supplemented by data from the literature, where the NW European shelf is treated as a box with carbon entering and leaving the box. This budget showed that net C-burial was a small sink of 1.3 ± 3.1 Tg C yr−1, while CO2efflux from estuaries to the atmosphere, removed the majority of river C-inputs. In contrast, the input from the Baltic Sea likely contributes to net export via the continental shelf pump and advection (34.4 ± 6.0 Tg C yr−1).