Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

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

[A-CG35] Projection and detection of global environmental change

Wed. May 29, 2019 3:30 PM - 5:00 PM 303 (3F)

convener:Michio Kawamiya(Japan Agency for Marine-Earth Science and Technology), Hiroaki Tatebe(Japan Agency for Marine-Earth Science and Technology), Kaoru Tachiiri(Japan Agency for Marine-Earth Science and Technology), Chairperson:Kaoru Tachiiri(Japan Agency for Marine-Earth Science and Technology), Michio Kawamiya(JAMSTEC)

4:30 PM - 4:45 PM

[ACG35-11] Progress of MIROC-ES2 simulations in CMIP6 and the analysis of the biogeochemical feedbacks

*Tomohiro Hajima1, Shingo Watanabe1, Michio Kawamiya1, Kaoru Tachiiri1, Hiroaki Tatebe1, Akihiko Ito2, Kumiko TAKATA2, Michio Watanabe1, Maki Noguchi1, Akitomo Yamamoto1, Akinori Ito1, Manabu Abe1, Rumi Ohgaito1, Dai Yamazaki3 (1.Japan Agency for Marine-Earth Science and Technology, 2.National Institute for Environmental Studies, 3.Institute of Industrial Science, the University of Tokyo)

Keywords:Earth system model, Biogeochemistry, CMIP6, Carbon cycle, Feedback

In order to reveal how climate-biogeochemical system responds to anthropogenic forcing, a new Earth system model “MIROC-ES2L” has been developed for CMIP6. The physical core of the model is “MIROC5.2”, and the biogeochemical component are updated from that used for CMIP5: the new model has explicit CN interaction in land ecosystem, and ocean component has been improved to include P, Fe, and O in addition to C and N cycles that were already incorporated into that of CMIP5 ver. In the new model, ocean N cycle is opened to other subsystems: N input via biological fixation, deposition and riverine transport are considered, and denitrification process controls N loss from the ocean. This model is used for CMIP6 runs, by participating in endorsed MIPs such as C4MIP, PMIP, OMIP, LUMIP, CDRMIP, ScenarioMIP, VolMIP, etc.
A provisional historical simulation by MIROC-ES2L with CMIP6 official forcing (v6.2.1) clearly showed a global warming trend from 1970’s, which is consistent with observation (HadCRU4). Carbon stored in land ecosystem decreased by responding to the land-use change forcing, and started to increase around 1960 by responding to CO2 increase and increased N input into land (N deposition and fertilizer), in addition to the response to LUC. Ocean continuously store the anthropogenic CO2: the increase during 1850-2005 is about 150PgC, which is almost similar level to the number reported in Global Carbon Budget 2017. In addition to C cycle, the historical simulation showed drastic changes in global N budget, by directly responding to the anthropogenic forcing (LUC and agriculture), and indirectly affected by climate–carbon cycle change. Agriculture increased both land N2O emission (diagnosed) and N leaching, the latter of which impacted on ocean biogeochemistry near river mouths.