Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

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

[A-CG41] Biogeochemical linkages between the ocean and the atmosphere during phytoplankton blooms

Tue. May 22, 2018 1:45 PM - 3:15 PM 106 (1F International Conference Hall, Makuhari Messe)

convener:Yuzo Miyazaki(Institute of Low Temperature Science, Hokkaido University), Jun Nishioka(Hokkaido University, Institute of low temperature sciences), Koji Suzuki(北海道大学, 共同), Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University), Chairperson:Miyazaki Yuzo(Institute of low temperature science, Hokkaido University)

2:45 PM - 3:00 PM

[ACG41-05] Impact of atmospheric iron inputs on marine primary productivity and nutrient cycling

*Kazuhiro Misumi1, Daisuke Tsumune1 (1.Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry)

Keywords:Iron, Nutrients, Numerical simulation

A micronutrient iron regulates marine primary productivity roughly one-third of the global ocean. Change in atmospheric iron deposition has been regarded as a factor controlling past climate changes through changing CO2 uptake by the ocean. Current global-scale marine biogeochemical models are using different iron deposition products derived from various atmospheric transport models. The total amounts of bioavailable iron supplied to the ocean vary 1.4–32.7 Gmol yr-1 among the models, being a large uncertainty to project future oceanic CO2 uptake. The variation of the iron supply rates can be attributed to 1) difference in the total iron deposition rate, 2) treatment of atmospheric processing determining the solubility and 3) treatment of consecutive dissolution of iron from sinking particles in the ocean. In this talk, we will address impact of atmospheric iron inputs on marine primary productivity and nutrient cycles by reviewing previous studies and results from some idealized experiments.