渤海和北黄海溶解N_(2)O浓度与通量的时空分布及其影响因素  

Distributions and Fluxes of Dissolved Nitrous Oxide in the Bohai Sea and the North Yellow Sea and Their Influencing Factors

作　　者：王翎羽 简慧敏[1,2] 王雲仟 罗畅 宋国栋 刘素美[1,2] 张桂玲 Wang Lingyu;Jian Huimin;Wang Yunqian;Luo Chang;Song Guodong;Liu Sumei;Zhang Guiling(Frontiers Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Laboratory for Marine Ecology and Environmental Science,Qingdao Marine Science and Technology Center,Qingdao 266237,China)

机构地区：[1]中国海洋大学深海圈层与地球系统前沿科学中心和海洋化学理论与工程技术教育部重点实验室,山东青岛266100 [2]青岛海洋科技中心海洋生态与环境科学功能实验室,山东青岛266237

出　　处：《中国海洋大学学报（自然科学版）》2024年第12期80-89,共10页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(U1806211,42176044,NORC2021-01)资助。

摘　　要：本文于2021年4、7和10月对渤海和北黄海海域进行调查与样品采集,测定其溶解N_(2)O浓度,并估算了其海气交换通量,分析了其分布及影响因素。结果表明:2021年4、7、10月渤海溶解N_(2)O平均浓度分别为(12.6±0.5)、(9.1±1.0)和(8.9±0.5)nmol/L,北黄海为(12.5±0.6)、(11.5±1.7)和(9.3±0.8)nmol/L,溶解N_(2)O浓度存在明显季节变化,表现为春季高于夏、秋季。N_(2)O浓度高值主要集中在渤海西部和渤海海峡附近。春季和秋季水体垂直混合均匀,底层N_(2)O略高于表层。夏季水体层化导致N_(2)O浓度自表层向底层逐渐升高。温度及陆源输入是影响渤海和北黄海N_(2)O浓度及通量分布的重要因素。2021年黄河向渤海输入N_(2)O总量约为8.07×10^(5)mol。三个航次渤海、北黄海表层N_(2)O总体呈现过饱和状态,夏季饱和度和通量高于春、秋季,4、7、10月渤海N_(2)O海气交换通量分别为(0.6±1.1)、(2.3±2.1)和(0.3±1.8)μmol·m^(-2)·d^(-1),北黄海为(0.3±0.5)、(0.9±1.2)和(0.1±0.2)μmol·m^(-2)·d^(-1)。结合文献报道结果,估算出渤海N_(2)O年释放量为6.5×10^(-4)Tg,占全球海洋N_(2)O年释放量的0.010%,低于渤海在全球海洋面积的占比(0.021%),这对准确评估近海对大气N_(2)O的区域性贡献具有重要意义。Based on the surveys conducted in the Bohai Sea and North Yellow Sea in April,July and October 2021,dissolved N_(2)O concentrations in water column were measured,air-sea fluxes were estimated,and the influencing factors on distribution were recognized.The average concentrations of dissolved N_(2)O in the Bohai Sea were(12.6±0.5)nmol/L in April,(9.1±1.0)nmol/L in July and(8.9±0.5)nmol/L in October,while dissolved N_(2)O concentrations in the North Yellow Sea were(12.5±0.6),(11.5±1.7)and(9.3±0.8)nmol/L,respectively.The concentrations of dissolved N_(2)O in spring were higher than those in summer and autumn.High concentrations of N_(2)O occurred mainly in the western Bohai Sea and near the Bohai Strait.In spring and autumn,the water column was vertically mixed,and N_(2)O in the bottom waters was slightly higher than that in the surface.In summer,the stratification of water column resulted in a general increase of N_(2)O concentration from the surface to the bottom.Temperature and terrestrial input are important factors affecting the distribution and fluxes of dissolved N_(2)O in the Bohai Sea and the North Yellow Sea.The total fluxes of N_(2)O input from the Yellow River to the Bohai Sea was about 8.07×10^(5)mol in 2021.During the three cruises,the surface waters of the Bohai Sea and the North Yellow Sea were oversaturated with respect to atmospheric N_(2)O.The saturations and fluxes of N_(2)O in summer were higher than those in spring and autumn.The air-sea N_(2)O fluxes of the Bohai Sea were(0.6±1.1)μmol·m^(-2)·d^(-1) in April,(2.3±2.1)μmol·m^(-2)·d^(-1) in July,(0.3±1.8)μmol·m^(-2)·d^(-1)in October,while the fluxes in the North Yellow Sea were(0.3±0.5),(0.9±1.2)and(0.1±0.2)μmol·m^(-2)·d^(-1),respectively.Combined with the results from previous research,the annual N_(2)O emission from the Bohai Sea was calculated to be 6.5×10^(-4)Tg,accounting for about 0.010%of the global oceanic emission with an area percentage of 0.021%.This is of great significance for re-evaluating the regional contr

关 键 词：渤海 北黄海 黄河 氧化亚氮 海气交换通量 

分 类 号：P734[天文地球—海洋化学]