Enhancement of coccolithophorid blooms in the Bering Sea by recent environmental changes

Naomi Harada, Miyako Sato, Kazumasa Oguri, Kyoko Hagino, Yusuke Okazaki, Kota Katsuki, Yoshinori Tsuji, Kyung Hoon Shin, Osamu Tadai, Sei Ichi Saitoh, Hisashi Narita, Susumu Konno, Richard W. Jordan, Yoshihiro Shiraiwa, Jacqueline Grebmeier

研究成果: Contribution to journalArticle査読

28 被引用数 (Scopus)

抄録

Since 1997, ocean color satellite images have revealed large-scale blooms of the coccolithophorid Emiliania huxleyi in the eastern Bering Sea. The blooms are often sustained over several months and have caused ecosystem changes in the Arctic Ocean, as well as in the Bering Sea. We examined continental shelf sediment profiles of alkenone, a biomarker for E. huxleyi, covering the past ∼70 years. The alkenone records suggest that large E. huxleyi blooms are a novel feature in the Bering Sea as they have occurred only since the late 1970s. Recent changes in alkenone content were closely related to the 1976-77 climatic regime shift in the North Pacific, implying that warming and freshening of Bering Sea waters promoted E. huxleyi blooms. The production rate of diatoms (total valves in sediment samples), the dominant primary producers in the Bering Sea, also increased during the past several decades. However, the ratio of alkenone content to total diatom valves in the sediments increased as E. huxleyi production increased, suggesting that the increase in the E. huxleyi production rate frequently exceeded the increase in the diatom production rate. Overall, our results indicate a possible subarctic region ecosystem shift driven by climate change.

本文言語英語
論文番号GB2036
ジャーナルGlobal Biogeochemical Cycles
26
2
DOI
出版ステータス出版済み - 2012

All Science Journal Classification (ASJC) codes

  • 地球変動および惑星変動
  • 環境化学
  • 環境科学(全般)
  • 大気科学

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