Japan Geoscience Union Meeting 2019

Presentation information

[E] Oral

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

[A-CG32] Global Carbon Cycle Observation and Analysis

Tue. May 28, 2019 1:45 PM - 3:15 PM 301A (3F)

convener:Kazuhito Ichii(Chiba University), Prabir Patra(Research Institute for Global Change, JAMSTEC), Forrest M. Hoffman(Oak Ridge National Laboratory), Makoto Saito(National Institute of Environmental Studies), Chairperson:Kazuhito Ichii

2:15 PM - 2:30 PM

[ACG32-03] Evaluation of MIROC4-ACTM reanalysis of GHGs concentrations using aircraft

*Jagat Bisht1, Prabir Patra1, Naveen Chandra1, Sergey Gromov2, Taku Umezawa3, Andreas Zahn4, cARL A. M. Brenninkmeijer5 (1.Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan, 2.Max Planck Institute for Chemistry, Mainz, Germany, 3.National Institute for Environmental Studies, Tsukuba, Japan, 4.Karlsruhe Institute of Technology (KIT), Institute for Meteorology and Climate Research, Karlsruhe, Germany, 5.Max Planck Institute for Chemistry, Air Chemistry Division, Mainz, Germany)


Using the “Atmospheric Chemistry Transport Model” being part of the “Model for Interdisciplinary Research On Climate Earth System Model, version 4” (MIROC4-ACTM), simulations of several important greenhouse gases, such as CH4, CO2, SF6, and N2O, have been conducted using optimized emissions by inverse modelling of surface measurements for the period 1996-2016 (referred to as “reanalysis data”). Aircraft observations, conducted on board passenger aircraft (projects: CARIBIC and CONTRAIL) over diverse latitude and longitude regions offer independent constraints for evaluating the quality of reanalysis data. MIROC4-ACTM captures the variations in CO2 and SF6 observed by CARIBIC and CONTRAIL very well, with a correlation coefficient of above 0.96 and a slope of 0.92 at all atmospheric conditions. However, for CH4 and N2O the agreement was worse, with correlation coefficients (slopes) between CONTRAIL observations and model simulations of 0.80(0.49)-0.87(0.66) and 0.74(0.55)-0.77(0.75), respectively, at 0-140oE and poleward of 40oN. Further south, that is between 30oS-40oN latitude (for the Tokyo-Australia flights), the correlation coefficients (slopes) was 0.76(0.83)-0.88(0.89) and 0.92(0.87)-0.98(1.05), respectively. Similarly, the agreement with the CARIBIC observations was moderate for CH4 and N2O, with correlation coefficients (slopes) of 0.81(0.55) and 0.88(0.65), respectively.