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北極海の淡水経路の変化

James Morison1, Ron Kwok, Cecilia Peralta-Ferriz

  • 1Polar Science Center, Applied Physics Laboratory, University of Washington, 1013 Northeast 40th Street, Seattle, Washington 98105, USA. morison@apl.washington.edu

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|January 7, 2012
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まとめ
この要約は機械生成です。

北極海の新鮮化は,2000年代には,ユーラシアの流れのシフトにより強まりました. 北極振動の増加は大気循環を強化し,淡水経路を変え,海洋循環に影響を与えた.

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科学分野:

  • 海洋学 海洋学とは
  • 気候科学 気候科学
  • 北極研究 アークティック研究

背景:

  • 北極海の新鮮化が1990年代から観察され,世界の海洋循環に潜在的に影響を及ぼしている.
  • 以前の説明は,氷の融解の増加とボーフォート高層の強化に焦点を当てていたが,観測は限られていた.
  • 既存のデータは,他の要因が淡水含有量に影響を与えたことを示唆しており,特に弱体化したボーフォート高原の下では特にそうであった.

研究 の 目的:

  • 2005年から2008年の間に北極海の新鮮化要因を調査する.
  • 淡水の含有量の変化における大気循環と海洋経路の役割を決定する.
  • 北極の淡水に対する北極振動とボーフォート渦巻の影響を明らかにするために. 北極の淡水.

主な方法:

  • 海面の高さや海底圧力を含む衛星データを活用した.
  • 総合的な分析のために,状況観察データを組み込みます.
  • カナダとユーラシアの盆地間の淡水含有量の変化を分析した.

主要な成果:

  • 2005年から2008年にかけての記録的な海氷の減少は,カナダ盆地における淡水の増加と,ユーラシア盆地における淡水の減少と一致した.
  • 淡水の再分配は,ユーラシア流出経路のサイクロン的なシフトによって引き起こされた.
  • このシフトは,北半球の大気循環が西から東に強まり,北極振動指数が増加したことで示された.

結論:

  • 流出は北極海の淡水含有量に大きな影響を与えます.
  • 北極振動は,流出の経路とタイミングを調節し,淡水の分配に影響を与えます.
  • 世界的な大気循環パターンは,ボフォート渦巻だけでなく,北極海の淡水ダイナミクスを理解するための鍵です.