土壌の呼吸によって引き起こされるCO2パルスは,オーストラリアの流れの変動性を支配する
Eva-Marie Metz1, Sanam N Vardag1,2, Sourish Basu3,4
1Institute of Environmental Physics, Heidelberg University, 69120 Heidelberg, Germany.
まとめ
降雨後のオーストラリアの二酸化炭素 (CO2) 脈動は,地球規模の沈殿の変動を促します. 乾季の終わりに衛星で観測されたCO2の排出は オーストラリアの炭素バランスと気候モデルに大きな影響を及ぼします
科学分野:
- 地球システム科学
- 大気化学
- エコロジー
背景:
- オーストラリアの陸上の生態系は,世界の二酸化炭素 (CO2) 沈み込みの変動性に大きく影響している.
- 遠隔地からの局所データが限られているため,CO2流動要因の理解が困難です.
研究 の 目的:
- 衛星観測を用いて,オーストラリアにおけるCO2流動の変動要因を調査する.
- 観測されたCO2パルスのオーストラリアの年間炭素バランスへの影響を定量化するために.
主な方法:
- 2009年から2018年にかけての衛星による大気中のCO2測定の分析
- 衛星による二酸化炭素の流れと,以前の逆転とボトムアップの見積もりとの比較
主要な成果:
- 乾季の終わりに,オーストラリア上空で CO2 の繰り返し発生が確認されました.
- 雨が降る直後に発生するこのパルスは 半乾燥地帯の土壌呼吸の強化によって引き起こされます
- 特定されたパルスは,以前に推定されたものより2〜3倍の季節的なCO2変動を引き起こします.
結論:
- 乾燥期のCO2パルスは,オーストラリアの年間炭素バランスの変動を制御する主要な要因です.
- 大陸規模の二酸化炭素の流れに影響を与える重要なプロセスです.
- この発見は,地球温暖化と炭素循環のフィードバックモデリングに重大な影響を及ぼします.
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