The effect of typhoons on phytoplankton communities and settling particle flux in the western North Pacific subtropical region

Ishida Hiroshi, Furusawa Kazusi, Makino Takashi, Ishizaka Joji, W. Watanabe Yutaka

doi:10.5928/kaiyou.25.2_17

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Other Title

西部北太平洋亜熱帯海域における台風の影響を受けた可能性のある植物プランクトン群集組成と沈降粒子
セイブキタタイヘイヨウアネッタイカイイキニオケルタイフウノエイキョウオウケタカノウセイノアルショクブツプランクトングンシュウソセイトチンコウリュウシ

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<p>Phytoplankton communities and carbon biomass were investigated at 22.5 °N, 131.8 °E in the western North Pacific subtropical region between 2004 and 2006 within 10 days of a typhoon passing within 500 km of the survey point. The typhoons of 2006 were EWINIAR and BILIS. The translation speeds of these typhoons at the nearest area from the survey point were 2.8 and 4 m s^―1, respectively slower than that of 2004ʼs typhoon KOMPUS (6.5 m s^―1) and 2005ʼs typhoon HITANG (7.9 m s^―1). After the 2006 typhoons, the sea surface water temperature decreased, and the chlorophyll-a increased over a wide area, including the investigation point. The number of diatoms in 2006 increased, and the carbon biomass was 5-10 times higher compared with 2004 and 2005. The dominant species of diatom was Planktoniella sol with 4 × 10⁷cells m^―2 which was considerably higher than the cell density 2004 (1 × 10⁵cells m^―2) and 2005 (5 × 10⁴cells m^―2). 2006 carbon biomass of the cyanobacteria and bacteria was twice as high as that of other years. The settling particle flux after a specific typhoon was not increased, in contrast with the hypothesis we derived from the increasing biomass data.</p>

Journal

Oceanography in Japan

Oceanography in Japan 25 (2), 17-41, 2016-03-15

The Oceanographic Society of Japan

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