Long-term and interannual variations of atmospheric methane observed by the NIES and collaborative observation networks by Taku Umezawa, Yasunori Tohjima, Yukio Terao, Motoki Sasakawa, Astrid Müller, Tazu Saeki, Toshinobu Machida, Shin-Ichiro Nakaoka, Hideki Nara, Shohei Nomura, Masahide Nishihashi, Hitoshi Mukai, Matthias Max Frey, Isamu Morino, Hirofumi Ohyama, Yukio Yoshida, Jiye Zeng, Hibiki Noda, Makoto Saito, Tsuneo Matsunaga, Takafumi Sugita, Hiroshi Tanimoto, Yosuke Niwa, Akihiko Ito, Yousuke Yamashita, Tomoko Shirai, Misa Ishizawa, Kentaro Ishijima, Kazuhiro Tsuboi, Yousuke Sawa, Hidekazu Matsueda

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