南極 の 産卵 減少 は 氷床 の 薄れ ゆく に 匹敵 する
Chad A Greene1, Alex S Gardner2, Nicole-Jeanne Schlegel2
1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA. chad@chadagreene.com.
Nature
|August 10, 2022
まとめ
南極大陸
科学分野:
- 氷河学 と 気候 科学
- 地球 観測 と 遠隔 感知
背景:
- 南極の氷棚は 氷河の海への流れを制御し 世界的な海面上昇に影響を与えます
- 限られたデータにより 氷床の動態と断層の影響を 大規模に監視することが困難でした
研究 の 目的:
- 氷床の海岸線を全体的に記録し,1997年以降の変化を評価する.
- アイスシェルフの薄まりと断層が 裏付けと将来の海面上昇に及ぼす影響を定量化するためです
主な方法:
- マルチセンサーの光学データとレーダー衛星データの統合
- 1997年から2021年の間,空間的に連続した,年間解像度の南極海岸線の生成.
- 氷床の支柱に及ぼす海岸線進化の影響をモデル化する.
主要な成果:
- 1997年から2021年の間に,南極の氷棚面積の36,701 ± 1,465 km2の純損失が発生しました.
- 氷面の退却と氷棚の薄れによる質量損失はほぼ同じで,高さ計だけで測定可能な量のほぼ2倍でした.
- 2007年以降 氷床の補強も減少しています
結論:
- 南極の氷棚地域は 重要な純損失を経験しており 将来の産卵イベントはリスクをもたらします
- 減量と後退による 質量損失の合計は 高度計だけで 推定される量のほぼ2倍です
- 氷床の縮小が進むと 地球の海面が大きく上昇します
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