Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

A (Atmospheric and Hydrospheric Sciences ) » A-CG Complex & General

[A-CG42] Biogeochemical linkages between the surface ocean and atmosphere

Wed. May 29, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Yuzo Miyazaki(Institute of Low Temperature Science, Hokkaido University), Jun Nishioka(Hokkaido University, Institute of low temperature sciences), Koji Suzuki(Hokkaido University), Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University)

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

*Fumikazu Taketani1, Maki Noguchi Aita1, Kazuyo Yamaji1,2, Takashi Sekiya1, Kohei Ikeda3, Taketo Hashioka1, Makio Honda1, Kazuhiko Matsumoto1, Yugo Kanaya1 (1.Japan Agency for Marine-Earth Science and Technology, 2.Kobe University, 3.National Institute for Environmental Studies)

Keywords:Deposition, Bay of Bengal, Marine Ecosystem, nutrient

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.