Long-term and interannual variations of atmospheric methane observed by the NIES and collaborative observation networks

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

doi:10.1186/s40645-025-00711-9

Fig. 7

From: Long-term and interannual variations of atmospheric methane observed by the NIES and collaborative observation networks

Temporal variations of the daily averaged XCH₄ data and its standard deviation (red dots with vertical bars) retrieved from the ground-based FTS network TCCON in a Rikubetsu, b Burgos, c Tsukuba, and d COCCON network in Tsukuba. The trend curves are shown as blue lines. Data gaps observed during the summer month in Tsukuba are primarily caused by the lack of measurements during the rainy season (June to August) and instrument problems

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