Are typhoon and marine eutrophication the possible missing sources of high dissolved organic nitrogen in wet deposition?

Abstract

The aim of this study is to elaborate a possible missing source of high-throughput organic nitrogen in rainfall. The authors classified the observed flux data of dissolved organic nitrogen in terms of the attributes of the wet deposition event itself, such as the season, precipitation, air mass backward trajectory, and effect of typhoons. The monitoring results of the ocean eutrophication and the chlorophyll-a map of the surface water were compared with the trajectory of the high-flux deposition events. The results show that approximately one third of the total wet deposition organic nitrogen derived from a confluence of three factors: rain in the wet season, air masses from the ocean, and rainfall over 50 mm. It could be seen that the co-occurrence of intense events such as a typhoon and eutrophic surface sea waters might be an important source of dissolved organic nitrogen in wet deposition.

Keywords

• organic nitrogen deposition
• marine eutrophication
• typhoon