1900年から2017年の米国東海岸の海面変動の起源
Christopher G Piecuch1, Peter Huybers2, Carling C Hay3
1Woods Hole Oceanographic Institution, Woods Hole, MA, USA. cpiecuch@whoi.edu.
Nature
|December 21, 2018
まとめ
地質学的過程,主に過去の氷河期からの地殻沈没は,米国の東海岸に沿って相対的な海面上昇の主要な要因です. これらの地質学的な要因は 何世紀にもわたって海面に影響を与え続けるでしょう
科学分野:
- 地理学
- 海洋学
- 気候科学
背景:
- 米国東海岸の相対的な海面の傾向は,大きな空間的変動を示しています.
- 以前の研究では,これらの変動は氷河の静止調整,氷と水の再分配,そして海洋循環の変化に起因していた.
研究 の 目的:
- 1900年から2017年の米国東海岸沿いの相対的な海面変動の地域的空間的差異を制御する支配的な要因を特定する.
- 垂直地殻の動きと他の要因が観測された海面の変化に与える影響を評価する.
主な方法:
- 計測データとプロキシ海水位データの分析
- 地殻の動きと海面の動向をモデル化するための確率的方法の適用.
- モデルの出力を観察データと比較する.
主要な成果:
- 垂直地殻の動き,特に氷河前部の緩解による沿岸沈下は,相対的な海面動向の支配的なコントロールであった.
- 北カロライナ州,メリーランド州,バージニア州近くで最も強い沈殿率が観測され,以前より厚い石層を示唆しています.
- 20世紀の氷河と水の再分配による貢献を示しています. 氷河は,氷河が氷河を覆い,氷河は氷河を覆い,氷河は氷河を覆い,氷河は氷河を覆い,氷河は氷河を覆い,氷河は氷河を覆い,氷河は氷河を覆う.
結論:
- 地質学的過程,特に垂直の陸地運動は,米国の東海岸における相対的な海面上昇における大規模な空間的変動のほとんどを説明します.
- これらの地質学的な要因は 何世紀にもわたって持続し,地域の相対的な海平面の動向の長期的安定性を示しています.
- この発見は,地球が脱氷に与える反応の理解を洗練し,沿岸海面に地質学的要因の持続的な影響を強調しています.
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