|Abstract: ||本研究採集2017年1月至12月期間東海南端(ECS)的基隆(沿海都市)以及彭佳嶼(離島)共117個濕沉降樣本。透過分析樣品中的溶解性總氮(total dissolved nitrogen, TDN) (TDN可分為溶解性無機氮(dissolved inorganic nitrogen, DIN)和溶解性有機氮(dissolved organic nitrogen, DON))、溶解性無機磷(dissolved inorganic phosphorus, DIP)和主要離子，研究在特殊性降雨(梅雨與颱風)及連續性降雨時期雨水中的物種變化。全年降雨時期基隆及彭佳嶼的DON濃度分別占TDN的35 ± 12%和55 ± 15% (基隆的DON日平均濃度為90.5 ± 167 μM；彭佳嶼的DON日平均濃度為53.9 ± 41.9 μM)，連續性降雨時期基隆及彭佳嶼的DON濃度分別占TDN的38 ± 13%和66 ± 9% (基隆的DON日平均濃度為95.3 ± 187 μM；彭佳嶼的DON日平均濃度為48.6 ± 46.3 μM)。通量部分，基隆的DIN和DON分別為277 ± 28.6 mmol m-2 yr-1和129 ± 16.9 mmol m-2 yr-1；彭佳嶼的DIN和DON分別為32.2 ± 2.7 mmol m-2 yr-1和53.2 ± 4.6 mmol m-2 yr-1。颱風期間基隆TDN的76.7%為DIN、23.3%為DON；颱風期間彭佳嶼TDN的18.5%為DIN、81.5%為DON，與全年降雨相比(基隆：65%：35%、彭佳嶼：45%：55%)，影響基隆TDN的DIN以及彭佳嶼TDN的DON有明顯上升的趨勢(尤其是在彭佳嶼)，表示颱風事件有可能會加劇原有的物種行為模式。|
In this study,117 rain water samples were collected from a coastal city (Keelung) and a remote island (Pengjiayu) located on the south of East China Sea (ECS) during the period from January to December 2017. The rainfall samples were analyzed for total dissolved nitrogen (TDN) which includes dissolved inorganic nitrogen (DIN) and dissolved organic nitrogen (DON), dissolved inorganic phosphorus (DIP) and major ions. To understand the influence level of rainfall types, we have classified the types into continuous and special (plum rain and typhoon) rainfall types. The mean concentrations of DIN at Keelung and Pengjiayu were 90.5 ± 167 μM and 53.9 ± 41.9 μM, respectively, which accounted for 35 ± 12% and 55 ± 15% of the TDN, respectively. The mean concentrations of DON at Keelung and Pengjiayu were 95.3 ± 187 μM and 48.6 ± 46.3 μM, respectively, which accounted for 38 ± 13% and 66 ± 9% of the TDN, respectively. Regarding the flux, the DIN and DON were 277 ± 28.6 mmol m-2 yr-1 and 129 ± 16.9 mmol m-2 yr-1 in Keelung, respectively; and were 32.2 ± 2.7 mmol m-2 yr-1 and 53.2 ± 4.6 mmol m-2 yr-1 in Pengjiyu, respectively. The concentrations of DIN and DON were 76.7% and 23.3% of TDN, respectively, at Keelung during typhone rainfall period. During the typhone rainfall period, the concentrations of DIN and DON were 18.5% and 81.5% of TDN at Pengjiyu, respectively. The results show that DIN at Keelung and DON in Pengjiyu play a key role on the nitrogen cycle in the atmosphere.