サブポラー北大西洋の 転覆に関する我々の見解の海の変化
M S Lozier1, F Li1, S Bacon2
1Division of Earth and Ocean Sciences, Duke University, Durham, NC, USA. mslozier@duke.edu feili.li@duke.edu.
まとめ
サブポラー北大西洋プログラム (OSNAP) の転覆は,大西洋南極転覆循環 (MOC) が非常に変動していることを示しています. ラブラドール海だけでなく イルミンガー海とアイスランド海域の深海変換が この変動を誘発しています
科学分野:
- 海洋学
- 気候科学
- 物理海洋学
背景:
- 大西洋の南極反転循環 (MOC) は,地球温暖化と淡水流通に不可欠です.
- 気候変動に関する政府間パネル (IPCC) のモデルは,21世紀のMOCの減速を予測しています.
- MOCの予測を検証するには観測データが必要です.
研究 の 目的:
- IPCC MOC予測のための観測基盤を確立する.
- サブポラー北大西洋MOCの変動と輸送を分析する.
主な方法:
- 2014年夏に北大西洋亜極域プログラム (OSNAP) の観測システムの展開
- 最初の21か月の観測データの分析
主要な成果:
- サブポラー転覆循環は著しい変動を示している.
- この循環は,熱と淡水の大部分を OSNAP 線で輸送します.
- イルミンガーとアイスランド盆地における深水変換は,MOCの変動の主な要因です.
結論:
- この研究は,ラブラドール海の深水形成がMOCの変動を独占しているという見解に異議を唱える.
- イーミンガー流域とアイスランド流域の大西洋水の変換は,亜極域MOCに大きな影響を与える.
- これらの発見は,気候モデルとMOC予測を洗練するために重要な観測データを提供します.
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