Spatial Variability and Factors Influencing the Air-Sea N2O Flux in the Bering Sea, Chukchi Sea and Chukchi Abyssal Plain
Spatial Variability and Factors Influencing the Air-Sea N2O Flux in the Bering Sea, Chukchi Sea and Chukchi Abyssal Plain
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DOI：
10.3390/atmos8040065
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发表时间：
2017-03
期刊：
影响因子：
2.9
通讯作者：
Man Wu;Liqi Chen;Liyang Zhan;Jiexia Zhang;Yuhong Li;Jian Liu
中科院分区：
文献类型：
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作者：
Man Wu;Liqi Chen;Liyang Zhan;Jiexia Zhang;Yuhong Li;Jian Liu
对中国第5次北极科学考察期间在亚北极和北冰洋上层300 m海域测定的臭氧消耗温室气体氧化亚氮（N2 O）浓度进行了研究。根据表层水溶解态N2 O的分布，研究区可分为阿留申盆地（52° N ~ 60° N）、大陆架（60° N ~ 73° N）和加拿大盆地（73° N以北）3个区域，表层水N2 O相对于大气分别处于平衡、过饱和和欠饱和状态。讨论了近地层下的物理和化学过程，如涡流扩散和沉积排放的影响。通量估算结果表明，阿留申盆地可能是一个弱的N2 O源，其通量约为0.46 ± 0.1 μmol·m−2·d−1，而大陆架可能是一个强的N2 O源，其通量约为8.2 ± 1.4 μmol·m−2·d−1。相比之下，加拿大海盆的楚科奇深海平原（CAP）至少是一个暂时的N2 O汇，强度约为−10.2 ± 1.4 μmol·m−2·d−1。
The concentrations of the ozone-depleting greenhouse gas nitrous oxide (N2O) in the upper 300 m of the Subarctic and Arctic Oceans determined during the 5th Chinese National Arctic Research Expedition were studied. The surface water samples revealed that the study area could be divided into three regions according to the distribution of dissolved N2O in the surface water, namely, the Aleutian Basin (52° N–60° N), continental shelf (60° N–73° N) and Canadian Basin (north of 73° N), with N2O in the surface water in equilibrium, oversaturated and undersaturated relative to the atmosphere, respectively. The influences of physical and chemical processes, such as eddy diffusion and sedimentary emissions, beneath the surface layer are discussed. The results of a flux evaluation show that the Aleutian Basin may be a weak N2O source of approximately 0.46 ± 0.1 μmol·m−2·d−1, and the continental shelf acts as a strong N2O source of approximately 8.2 ± 1.4 μmol·m−2·d−1. By contrast, the Chukchi Abyssal Plain (CAP) of the Canadian Basin is at least a temporal N2O sink with a strength of approximately −10.2 ± 1.4 μmol·m−2·d−1.