最後の氷河期における西南極の氷床の崩壊に関するゲノム学的証拠
Sally C Y Lau1,2, Nerida G Wilson3,4,5, Nicholas R Golledge6
1Centre for Sustainable Tropical Fisheries and Aquaculture and College of Science and Engineering, James Cook University, Townsville, Qld, Australia.
まとめ
西南極の氷床 (WAIS) は,気候緩和によっても崩壊する可能性があります. 南極のタコの遺伝子解析は 過去のWAIS崩壊と 将来の脆弱性を示しています
科学分野:
- 古代気候学
- 氷河学
- 海洋生物学
背景:
- 西南極の氷床 (WAIS) は,将来の気候変動で崩壊し,潜在的に1.5°Cから2°Cの温暖化の中で臨界点を越える可能性があります.
- 過去の温暖期は,海面がかなり高かったときの WAIS の安定性についての洞察を提供します.
- 過去の氷の損失を理解することは,現在の気候軌道へのWAISの反応を予測するために不可欠です.
研究 の 目的:
- 過去に温暖な気候条件で WAIS が崩壊したかどうかを判断する
- 異なる温暖化シナリオの下でのWAISの転換点に関する経験的証拠を提供すること.
主な方法:
- 環南極のタコの種からゲノム全体の単核型ポリモルフィズム (SNP) を利用した.
- 遺伝データを分析して 遺伝子の流れを記録した
主要な成果:
- ヒトの遺伝子の流動パターンを特定した.
- これらの遺伝信号は WAISの完全な崩壊によって説明できます
結論:
- この研究は厳格な気候緩和目標下でも WAISの臨界点に達できるという最初の経験的証拠を提供します.
- 過去のWAISの崩壊は 章魚の遺伝学によって示され 温暖化に対する重大な脆弱性を示唆しています
- この発見は将来の海面上昇予測と 気候政策に重大な影響を及ぼします
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