Atmospheric Dry Deposition of Water-Soluble Nitrogen to the Subarctic Western North Pacific Ocean during Summer
Atmospheric Dry Deposition of Water-Soluble Nitrogen to the Subarctic Western North Pacific Ocean during Summer
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DOI：
10.3390/atmos10070351
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发表时间：
2019-06
期刊：
影响因子：
2.9
通讯作者：
Jin-young Jung;Byeol Han;B. Rodríguez;Y. Miyazaki;H. Chung;Kitae Kim;J. Choi;Keyhong Park;II-Nam Kim;Saewung Kim;E. Yang;Sung-Ho Kang
中科院分区：
文献类型：
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作者：
Jin-young Jung;Byeol Han;B. Rodríguez;Y. Miyazaki;H. Chung;Kitae Kim;J. Choi;Keyhong Park;II-Nam Kim;Saewung Kim;E. Yang;Sung-Ho Kang
为了估算大气中水溶性氮 (N)（包括铵 (NH4+)、硝酸盐 (NO3−) 和水溶性有机氮 (WSON)）的干沉降通量，2016 年夏天，韩国破冰船 IBR/V Araon 在北太平洋亚北极地区收集了气溶胶样本。在巡航期间，散装（细+粗）气溶胶中的 NH4+、NO3− 和 WSON 浓度分别为 0.768 至 25.3、0.199 至 5.94 和 0.116 至 14.7 nmol m−3。 NH4+、NO3− 和 WSON 对水溶性总氮的贡献分别为约 74%、约 17% 和约 9%。水溶性氮浓度从东亚大陆到北太平洋亚北极西部呈现出很强的梯度，表明水溶性氮形态主要来自人为或陆地来源。在海雾事件期间，粗模式 NO3− 可能比细模式 NO3− 更有效地被雾滴清除；此外，仅在精细模式下检测到 WSON，这表明海雾可能对 WSON 产生了显着影响，例如 WSON 光化学转化为无机 N。通过使用 Redfield C/N 比，估计北太平洋亚北极西部的水溶性总 N 的平均干沉降通量 (6.3 ± 9.4 µmol m−2 d−1) 支持 42 ± 62 µmol C m−2d−1 的最小碳吸收6.625。
To estimate dry deposition flux of atmospheric water-soluble nitrogen (N), including ammonium (NH4+), nitrate (NO3−), and water-soluble organic nitrogen (WSON), aerosol samples were collected over the subarctic western North Pacific Ocean in the summer of 2016 aboard the Korean icebreaker IBR/V Araon. During the cruise, concentrations of NH4+, NO3−, and WSON in bulk (fine + coarse) aerosols ranged from 0.768 to 25.3, 0.199 to 5.94, and 0.116 to 14.7 nmol m−3, respectively. Contributions of NH4+, NO3−, and WSON to total water-soluble N represented ~74%, ~17%, and ~9%, respectively. Water-soluble N concentrations showed a strong gradient from the East Asian continent to the subarctic western North Pacific Ocean, indicating that water-soluble N species were mainly derived from anthropogenic or terrestrial sources. During sea fog events, coarse mode NO3− was likely to be scavenged more efficiently by fog droplets than fine mode NO3−; besides, WSON was detected only in fine mode, suggesting that there may have been a significant influence of sea fog on WSON, such as the photochemical conversion of WSON into inorganic N. Mean dry deposition flux for water-soluble total N (6.3 ± 9.4 µmol m−2 d−1) over the subarctic western North Pacific Ocean was estimated to support a minimum carbon uptake of 42 ± 62 µmol C m−2d−1 by using the Redfield C/N ratio of 6.625.