カリフォルニアのメタンのスーパーエミッター
Riley M Duren1,2, Andrew K Thorpe3, Kelsey T Foster3
1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. Riley.M.Duren@jpl.nasa.gov.
Nature
|November 8, 2019
まとめ
カリフォルニア州
科学分野:
- 環境科学
- 大気化学
- リモートセンシング
背景:
- メタンは強力な温室効果ガスで 温室効果ガスの削減は 世界的に優先されています
- ポイントソースメタンエミッターは有意であるが,特徴が不十分である.
- メタンの排出量に関する正確なデータは 効果的な緩和戦略に不可欠です
研究 の 目的:
- カリフォルニアのインフラストラクチャの メタンの排出量を 定量化するために
- 主要なメタンの放出源を空中遠隔検知で特定して位置づけること.
- 州全体のメタン埋蔵量に対する点源の貢献度を評価する.
主な方法:
- 2016年から2018年にかけて,空中画像スペクトロメーターの調査を5回実施した.
- 石油・ガス・肥料・廃棄物部門で27万2千以上のインフラストラクチャをマッピングしました.
- 564の強い点からのメタンの噴出を検知し,地理的に位置づけ,定量化しました.
主要な成果:
- 年間0.618Tgの純メタン排出量で,カリフォルニアの2016年の在庫の34~46%を占めている.
- ポイントソースの10%が,ポイントソースの総排出量の約60%を占めていることが判明した.
- 埋立地,乳業,石油/ガス部門が 主要な排出者であり,埋立地が最も大きい.
結論:
- 空中探知機は,メタン排出量の評価のために高解像度データを提供します.
- メタンの排出量の不均衡な割合は インフラの一部に起因する.
- データ共有は カリフォルニアの異常なメタン排出量の軽減を容易にした.
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