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Samuel Takele Kenea,Haeyoung Lee,Sangwon Joo,Shanlan Li,Lev D. Labzovskii,Chu-Yong Chung,Yeon-Hee Kim 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10
To comprehend interannual variability of CH₄ and its drivers, we used integrated data from different platforms such as in situ measurements, TROPOMI, and GOSAT retrievals. A pronounced change of annual growth rate was detected at Anmyeondo (AMY), Korea, ranging from -16.8 to 31.3 ppb yr<SUP>−1</SUP> as captured in situ through 2015-2020. High growth rates were discerned in 2016 (31.3 ppb yr<SUP>−1</SUP> and 13.4 ppb yr<SUP>−1</SUP> from in situ and GOSAT, respectively) and 2019 (27.4 ppb yr<SUP>−1</SUP> and 16.4 ppb yr<SUP>−1</SUP> from in situ and GOSAT, respectively). The high growth in 2016 was essentially explained by the strong El Niño event in 2015–2016, whereas the large growth rate in 2019 was not related to ENSO. We suggest that the growth rate that appeared in 2019 was related to soil temperature. The stable isotopic composition of <SUP>13</SUP>C/<SUP>12</SUP>C in CH₄ (δ<SUP>13</SUP>-CH₄) collected by flask-air sampling at AMY during 2014-2019 supported the soil methane hypothesis. The isotopic values in 2019 exhibited the strongest depletion compared to other periods, which suggests even a stronger biogenic signal that was affected by the variations of soil temperature and soil moisture.