5:15 PM - 6:30 PM
[AAS12-P02] Evaluation of GOSAT/TANSO-FTS TIR CH4 data using NICAM-TM and aircraft CH4 data
Keywords:GOSAT, CH4, evaluation
From the isentropic analysis, we found that the CONTRAIL/GRENE CH4 concentrations showed a large seasonal variation in the lower stratosphere, while the TIR CH4 data had higher concentrations there than the CONTRAIL/GRENE data and showed a relatively small seasonal variation; the seasonal variation of the NICAM-TM CH4 data were smaller than that of the TIR data. From the profile comparisons over Minamitorishima, we found that the TIR and aircraft CH4 data agreed to each other within 30 ppb at around 6 km in winter and spring, while their differences increased to 30 – 50 ppb in summer. We also investigated the impact of the coincident criteria on the comparisons results. Besides, we analyzed latitudinal distribution of TIR and aircraft CH4 data in the upper troposphere between Atsugi and Minamitorishima.
CONTRAIL/GRENE flask sampling data over Siberia was conducted under the GRENE Arctic Climate Change Research Project. Aircraft measurements between Atsugi and Minamitorishima were conducted by the Japan Meteorological Agency.