ラルフ・キーリング、今年は全月400ppm超えになると宣言

Note from Ralph Keeling as Keeling Curve reaches its annual low point: https://t.co/Vp1uYABCB3

— Keeling_Curve (@Keeling_curve) 2016年9月23日

The Keeling Curve Note on Reaching the Annual Low Point September 23,2016 Rob Monroe

From this it’s already clear that the monthly value for September will be above 400 ppm, probably around 401 ppm.

Is it possible that October 2016 will yield a lower monthly value than September and dip below 400 ppm? Almost impossible. Over the past two decades, there were four years (2002, 2008, 2009, and 2012) in which the monthly value for October was LOWER than September. But in those years, the decrease from September to October was at most 0.45 ppm – which would not seem to be enough to push October values below 400 ppm this year. The monthly value for October will therefore almost certainly also stay above 400 ppm and probably will be higher than 401 ppm.

という訳で今年は人類史上初めて大気中のCO2濃度が全ての月で400ppmを超えることが確実になった。

it already seems safe to conclude that we won’t be seeing a monthly value below 400 ppm this year – or ever again for the indefinite future.
Ralph Keeling

「今年どころか、無限の未来に渡って月別二酸化炭素濃度が400ppm以下になるのを見ることはないだろう。」
ということは、人類史上最後の400ppm未満の月は2015年10月だったことになる。
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