Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

A (Atmospheric and Hydrospheric Sciences) » A-OS Ocean Sciences & Ocean Environment

[A-OS09] Marine ecosystems and biogeochemical cycles: theory, observation and modeling

Wed. May 23, 2018 1:45 PM - 3:15 PM 105 (1F International Conference Hall, Makuhari Messe)

convener:Shin-ichi Ito(Atmosphere and Ocean Research Institute, The University of Tokyo), Takafumi Hirata(Faculty of Environmental Earth Science, Hokkaido University), Eileen E Hofmann (共同), Enrique N Curchitser (Rutgers University New Brunswick), Chairperson:Ito Shin-Ichi(The University of Tokyo)

2:00 PM - 2:15 PM

[AOS09-13] A phytoplankton model with dynamic stoichiometry based on a new instant acclimation scheme: good reproduction of the subsurface chlorophyll maximum and primary production

*Yoshio Masuda1, Yasuhiro Yamanaka1, Takafumi Hirata1, Hideyuki Nakano2 (1.Graduate School of Environmental Earth Science, Hokkaido University, 2.Meteorological Research Institute)

Keywords:phytoplankton, acclimation, stoichiometry, chlorophyll, primary production

Oceanic phytoplankton adjust to a change in surrounding environment, where the chlorophyll/carbon and nitrogen/carbon rations are changed. Based on Smith et al. (2015), we introduced new phytoplankton acclimation scheme into a biogeochemical model combined with an OGCM. The scheme is based on the assumption of instant acclimation; that is, phytoplankton stoichiometry (chl:C:N:Fe) is uniquely determined by a surrounding environmental condition. Therefore, it can represent dynamic stoichiometry with low computational costs. The model well reproduces the latitudinal distribution of the subsurface chlorophyll maximum. The simulated net primary production is similar to the observed, and it is underpinned by the good reproduction of chlorophyll distribution and variable nitrogen/carbon ratio.