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中緯度半球間水文波動は,過去55万年にわたって,
Kyoung-nam Jo1, Kyung Sik Woo2, Sangheon Yi1
1Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, South Korea.
Nature
|April 4, 2014
まとめ
ある研究では,熱帯間の収束地帯 (ITCZ) のシフトによって引き起こされる半球間水文学的揺れが,中緯度地域にまで広がっていることが明らかになった. この現象は,韓国洞窟で観察され,温帯気候システムと地球規模の氷河期サイクルに影響を与えています.
科学分野:
- 古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは,古代気候学 (paleoclimatology) とは
- 気候のダイナミクス
- 地質化学 地質化学
背景:
- 熱帯間の収束地帯 (ITCZ) は,緯度変化によって地域降雨に影響を与えます.
- 半球間水文学的揺れは,半球間の反相降水傾向を記述する.
- 以前の研究では,この揺り玉は熱帯および亜熱帯地域で活動することを示唆していました.
研究 の 目的:
- 半球間水学波の影響がより高い緯度地域と地球規模の気候システムに及ぼす影響を調査する.
- 熱帯で観測される水文学的反相が中緯度まで広がっているかどうかを判断する.
主な方法:
- 朝鮮半島の55万年のスペレオテム成長周波数記録の分析.
- 半球アンチフェーシングを特定するために,韓国のスペレオテムデータと南半球スペレオテム記録の比較.
主要な成果:
- 水力学的な波動の兆候である降雨の半球反相化は,太平洋西部中緯度で特定され,東北アジアまで広がった.
- 半球間水学波の影響は,過去55万年の間に少なくとも中緯度に達しています.
結論:
- 軌道時間スケールのITCZのシフトは,温帯気候システムに著しく影響を与えます.
- 半球間水文学的揺れは,北半球中緯度の水蒸気と植物のフィードバックに影響を与え,四次氷河期のサイクルを潜在的に調節する可能性があります.
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