ADEOS observations of chlorophyll a concentration, sea surface temperature, and wind stress change in the equatorial Pacific during the 1997 El Niño onset

Hiroshi Murakami, Joji Ishizaka, Hiroshi Kawamura

研究成果: Article査読

14 被引用数 (Scopus)

抄録

The atmosphere-ocean system in the equatorial Pacific transited to El Niño conditions from the spring to summer in 1997. The ADEOS comprehensively captured the onset of 1997-1998 El Niño through the combined observations of surface wind stress vector (WS), sea surface temperature (SST), and concentration of the photosynthetic pigment chlorophyll a (CHL). Responses of SST and CHL to WS in the El Niño onset showed regional characteristics in the four areas of the equatorial Pacific. In the western equatorial Pacific, CHL increased and SST decreased intermittently because of vertical mixing and coastal upwelling around the islands caused by local WS bursts. In the central parts, CHL decreased by 40% and SST increased by 2°C corresponding to the zonal movement of warm pool water, which seems to be controlled by the WS field during the El Niño onset. In the eastern parts, WS decreased by about half and SST increased by 4°C; however, CHL decreased only a little because of regulated processes of nutrients. In the eastern coastal area, CHL decreased and SST increased according to deepening of the thermocline. The thermocline depth seemed to be modulated by a dynamic balance with the basin-scale WS field and arrivals of Kelvin waves, which were caused by westerly WS bursts in the western equatorial Pacific and traveled in the thermocline to the eastern coastal area in the El Niño onset.

本文言語English
論文番号2000JC900091
ページ(範囲)19551-19559
ページ数9
ジャーナルJournal of Geophysical Research: Oceans
105
C8
DOI
出版ステータスPublished - 2000 8月 15
外部発表はい

ASJC Scopus subject areas

  • 地球化学および岩石学
  • 地球物理学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 大気科学
  • 天文学と天体物理学
  • 海洋学

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