Nitrogen in Atmospheric Wet Depositions Over the East Indian Ocean and West Pacific Ocean Spatial Variability, Source Identification, and Potential Influences

doi:10.3389/fmars.2020.600843

IOCAS-IR

	Nitrogen in Atmospheric Wet Depositions Over the East Indian Ocean and West Pacific Ocean Spatial Variability, Source Identification, and Potential Influences
	Jiang, Shan 1; Jin, Jie 1; Jiang, Shuo 1; Wu, Ying 1; Wang, Jianing2 ; Chen, Ju 3; Zhang, Zhenqiu 3; Liu, Sumei 4,5; Chang, Yan 1; Wang, Lingyan 4,5; Zhang, Jing1,6
	2021-01-25
发表期刊	FRONTIERS IN MARINE SCIENCE
卷号	7 页码:16
通讯作者	Jiang, Shan([email protected])
摘要	Atmospheric deposition is the dominant pathway for the loading of exogenous nitrogen (N) to open ocean. Here, rainwater samples were collected from 31 stations in the equatorial East Indian Ocean (EIO) and West Pacific Ocean (WPO) to explore the spatial variability of N species, potential sources, and related ecological influences. Among two oceans, nitrate (NO3-) and ammonium (NH4+) were the main components in the rainwater N inventory. NO3- concentrations varied from 0.19 to 100.5 mu M, whereas NH4+ concentrations ranged from 0.54 to 110.6 mu M. Among all stations, low concentrations of NO3- and NH4+ appeared in the remote ocean, whereas high concentrations were observed at the stations near the Malacca Strait and New Guinea, coupled with an enhancement of non-sea salt major ions, e.g., calcium ions (Ca2+) and sulfate (SO42-), revealing the influence from coastal human activities, such as coal and gasoline combustion. In the remote ocean, delta N-15-NH4+ ranged from -5.7 to-9.3 parts per thousand, whereas it dropped to-15.5 parts per thousand near coasts. A logarithmic decay between delta N-15-NH4+ and NH4+ concentrations in rainwater samples was obtained, suggesting a shift from natural source (seawater emission) in oceanic precipitation events to anthropogenic source (chemical fertilizer volatilization and vehicle exhaust) in coastal rainwaters. delta N-15-NO3- in the remote ocean varied between -1.7 and 0.4 parts per thousand with low levels found in the WPO, likely related to the ascending air flow driven by the Walker Circulation. In coastal oceans, delta N-15-NO3- ranged from 1.5 to 3.5. The linkage between delta N-15-NO3- and NO3- concentrations varied in two oceans, resulting from difference in biological and fossil fuel combustion contributions. Compared with ocean surface water, N in the rainwater was markedly enriched, suggesting that N from atmospheric wet depositions could rapidly enhance the dissolved N availability in ocean surface water. However, the N redundancy according to the Redfield-Brzezinski ratio (N:Si:P = 16:16:1) in the rainwater might benefit from the growth of N-preference phytoplankton species and microbes. As the first study on N concentrations, sources, and stoichiometry balance in rainwater over the equatorial WPO and EIO, the results could be a support to the global N budget estimation and oceanic primary production modeling.
关键词	atmosphere nitrogen Indian Ocean Pacific Ocean precipitation stable isotope
DOI	10.3389/fmars.2020.600843
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41876071]; National Natural Science Foundation of China[41876074]; National Natural Science Foundation of China[41476065]; National Natural Science Foundation of China[41706081]; National Natural Science Foundation of China[41806096]; Scientific Research Foundation of SKLEC[2017RCDW04]
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:000613332900001
出版者	FRONTIERS MEDIA SA
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/169695
专题	中国科学院海洋研究所
通讯作者	Jiang, Shan
作者单位	1.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Qingdao, Peoples R China 3.Chinese Acad Sci, South China Sea Inst Oceanol, Guangzhou, Peoples R China 4.Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Qingdao, Peoples R China 5.Ocean Univ China, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao, Peoples R China 6.Shanghai Jiao Tong Univ, Sch Oceanog, Shanghai, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Shan,Jin, Jie,Jiang, Shuo,et al. Nitrogen in Atmospheric Wet Depositions Over the East Indian Ocean and West Pacific Ocean Spatial Variability, Source Identification, and Potential Influences[J]. FRONTIERS IN MARINE SCIENCE,2021,7:16.
APA	Jiang, Shan.,Jin, Jie.,Jiang, Shuo.,Wu, Ying.,Wang, Jianing.,...&Zhang, Jing.(2021).Nitrogen in Atmospheric Wet Depositions Over the East Indian Ocean and West Pacific Ocean Spatial Variability, Source Identification, and Potential Influences.FRONTIERS IN MARINE SCIENCE,7,16.
MLA	Jiang, Shan,et al."Nitrogen in Atmospheric Wet Depositions Over the East Indian Ocean and West Pacific Ocean Spatial Variability, Source Identification, and Potential Influences".FRONTIERS IN MARINE SCIENCE 7(2021):16.

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