[A-CG42] 海洋表層－大気間の生物地球化学

[ACG42-P02] Influence of Deposition of Atmospheric Inorganic Nitrogen Compounds to Marine Ecosystem at Bay of Bengal

*竹谷 文一¹、相田 真希¹、山地 一代^1,2、関谷 高志¹、池田 恒平³、橋岡 豪人¹、本多 牧生¹、松本 和彦¹、金谷 有剛¹ (1.海洋研究開発機構、2.神戸大学、3.国立環境研究所)

キーワード：沈着、ベンガル湾、海洋生態系、栄養塩

To investigate the influence for the deposition of inorganic nitrogen compounds derived from the continent on the marine ecosystem at Bay of Bengal (BOB) in the North East Indian Ocean, we performed numerical simulations with and without atmospheric deposition of inorganic nitrogen compounds, using a 3-D lower trophic-marine ecosystem model (COCO-NEMURO), coupled with an atmospheric regional chemical transport model (WRF-CMAQ). The monthly mean data of wet and dry deposition of inorganic nitrogen compounds consisted of gases (HNO₃ and NH₃) and aerosol particles (NO₃^- and NH₄⁺) at BOB region in 2009 – 2016 produced by WRF-CMAQ were inputted to the COCO-NEMURO as a new nitrogen nutrient supplying process from the atmosphere. The results indicated that monthly average chlorophyll mass concentration at the surface in BOB was significant increase. This study indicates that the supply of atmospheric inorganic nitrogen compounds from continent to the BOB could lead to a high nutrient impact on the marine ecosystem within the subtropical region.