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地域パターンの変化にもかかわらず,地球全体の気温変動は増加していない
Chris Huntingford1, Philip D Jones, Valerie N Livina
1Centre for Ecology and Hydrology, Wallingford OX10 8BB, UK. chg@ceh.ac.uk
Nature
|July 26, 2013
まとめ
地球温暖化は,全体的な気候の変動性を増加させていないかもしれません. いくつかの地域では,より多くの気温変動が見られるが,地球全体の平均気温異常標準偏差は安定したままであり,一般的な仮定に反している.
科学分野:
- 気候科学 気候科学
- 環境科学 環境科学
背景:
- 社会の気候変動への適応は,変動性の増大と極端な天候によって困難に迫られている.
- 過去の寒い時期は,現在のいくつかの時期よりも高い温度変動を示した.
- 現在の地球温暖化が気候の変動性を増しているかどうかについては,議論が続いている.
研究 の 目的:
- 地球温暖化が現在の地球温暖化変動を増加させているかどうかを調査する.
- 温度変動の地理的および時間的な傾向を分析する.
- 気候変動の変動が増加したとの認識の妥当性を評価する.
主な方法:
- グローバル平均温度異常の時間変化の標準偏差の分析.
- 過去数十年にわたる年間気温変動の地理的変動の調査.
- 標準化と絶対的な温度異常値の比較.
主要な成果:
- 世界平均気温異常標準偏差は安定している.
- 温度変動の重要な地理的変動が観察されました.
- 以前は変動が低かった地域では増加が見られ,変動の認識に寄与しています.
- 絶対温度値を用いた分析は,正常化された異常とは異なり,最小限の変化を示した.
結論:
- 気候変動の変動が増加しているという認識は,地球規模での増加ではなく,地域的な変化に起因するかもしれない.
- 温暖化が自動的に全体的な気候変動の変動を増加させるわけではない.
- この発見は,地球温暖化の上昇が,普遍的に気候変動の変動が高まるという仮定に異議を唱えている.
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