@article{oai:nipr.repo.nii.ac.jp:00010044,
 author = {Belikov, D.A. and Bril, A. and Maksyutov, S. and Oshchepkov, S. and Saeki, T. and Takagi, H. and Yoshida, Y. and Ganshin, A. and Zhuravlev, R. and Aoki, S. and Yokota, T. and Belikov, D.A. and Bril, A. and Maksyutov, S. and Oshchepkov, S. and Saeki, T. and Takagi, H. and Yoshida, Y. and Ganshin, A. and Zhuravlev, R. and Aoki, S. and Yokota, T.},
 issue = {2},
 journal = {Polar science, Polar science},
 month = {Jun},
 note = {The distribution of atmospheric carbon dioxide (CO2) in the subarctic was investigated using the National Institute for Environmental Studies (NIES) three-dimensional transport model (TM) and retrievals from the Greenhouse gases Observing SATellite (GOSAT). Column-averaged dry air mole fractions of subarctic atmospheric CO2 (XCO2) from the NIES TM for four flux combinations were analyzed. Two flux datasets were optimized using only surface observations and two others were optimized using both surface and GOSAT Level 2 data. Two inverse modeling approaches using GOSAT data were compared. In the basic approach adopted in the GOSAT Level 4 product, the GOSAT observations are aggregated into monthly means over 5° × 5° grids. In the alternative method, the model-observation misfit is estimated for each observation separately. The XCO2 values simulated with optimized fluxes were validated against Total Carbon Column Observing Network (TCCON) ground-based high-resolution Fourier Transform Spectrometer (FTS) measurements. Optimized fluxes were applied to study XCO2 seasonal variability over the period 2009-2010 in the Arctic and subarctic regions. The impact on CO2 levels of emissions from enhancement of biospheric respiration induced by the high temperature and strong wildfires occurring in the summer of 2010 was analyzed. Use of GOSAT data has a substantial impact on estimates of the level of CO2 interanual variability., 国立環境研究所（NIES）の三次元大気輸送モデル（TM）と温室効果ガス観測技術衛星（GOSAT）のリトリーバル値を用いて、亜北極圏における大気中二酸化炭素（CO2）のカラム平均濃度（XCO2）濃度分布を解析した。インバースモデリングにより最適化された４種類のフラックスを用いてNIES TMにより計算されたXCO2値を、地上設置の高分解能 FTS 観測網TCCONによる観測値を用いて評価した。2009年から2010年の北極域から亜北極域におけるXCO2の季節変動を解析し、2010年夏季の高温による陸域生物圏の呼吸量増加や森林火災がXCO2変動に与える影響を考察した。フラックス最適化の際のGOSATデータの有無は、XCO2年々変動の再現に影響を及ぼすことが分かった。},
 pages = {129--145},
 title = {Column-averaged CO2 concentrations in the subarctic from GOSAT retrievals and NIES transport model simulations},
 volume = {8},
 year = {2014}
}