School of Earth and Environmental Sciences and Research Institute of Oceanography, Seoul National University, Seoul 151-742, Republic of Korea.
Sci Total Environ. 2010 May 1;408(11):2369-77. doi: 10.1016/j.scitotenv.2010.02.022. Epub 2010 Mar 15.
Atmospheric deposition of different types of aerosols over the southern East Sea has received little attention in terms of seawater biogeochemistry. We investigated the concentrations of water-soluble ions (NO3(-), NH4+ and nss-SO4(2-)) in the aerosols associated with air mass transport patterns arriving at the east coast of Korea, adjacent to the southern East Sea, in order to determine source regions affecting chemical composition of aerosols and to assess the atmospheric pathway as a significant controlling mechanism of the biogeochemistry in this marginal sea. Concentrations of certain elements (Al, Na, Ca, V, Zn and Pb) together with the water-soluble ions were measured in the aerosol samples (n=34) collected during the period March 2002-February 2003. The geometric mean concentrations of the water-soluble ions were NO3(-) 2.98 (0.56-16.22), NH4+ 1.42 (0.37-6.73) and nss-SO4(2-) 2.47 (0.17-17.35) microgm(-3). The backward trajectories revealed that air masses passing slowly over eastern China contributed more to increases in the concentrations of water-soluble ions than those associated with fast-moving northwesterly and maritime winds. Therefore, the correlation between the NH4+ and NO3+ concentrations increased, suggesting that gas-phase NH3 and HNO3 was forming fine-mode NH4NO3. The atmospheric N input accounted for approximately 10% of new production over the southern East Sea on an annual scale, while it accounted for over approximately 25% of new production during the water column stratification seasons (summer and early fall).
在海洋生物地球化学领域，人们对南海东部海域不同类型气溶胶的大气沉降关注甚少。本研究采集了 2002 年 3 月至 2003 年 2 月期间到达韩国东海岸（毗邻南海东部海域）的气团传输模式相关气溶胶样品，分析了其中水溶性离子（NO3(-)、NH4+和 nss-SO4(2-)）的浓度，以确定影响气溶胶化学组成的源区，并评估大气传输途径对该边缘海生物地球化学的重要控制机制。在所采集的 34 个气溶胶样品中，同时测定了某些元素（Al、Na、Ca、V、Zn 和 Pb）和水溶性离子的浓度。水溶性离子的几何平均浓度分别为：NO3(-)2.98（0.56-16.22）μg m(-3)、NH4+1.42（0.37-6.73）μg m(-3)和 nss-SO4(2-)2.47（0.17-17.35）μg m(-3)。后向轨迹表明，在缓慢经过中国东部的气团中，水溶性离子浓度的增加比与快速西北风和海洋风相关的气团中水溶性离子浓度的增加更为显著。因此，NH4+和 NO3+浓度之间的相关性增加，表明气相 NH3 和 HNO3 正在形成细颗粒态 NH4NO3。大气氮输入约占南海东部海域每年新生产力的 10%，而在水柱分层季节（夏季和初秋），大气氮输入约占新生产力的 25%以上。
