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Marine Ecology Progress Series

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MEPS 483:19-29 (2013)  -  DOI:

Impact of Typhoon Morakot on chlorophyll a distribution on the inner shelf of the East China Sea

Yunhai Li1,*, Xiang Ye1, Aijun Wang1, Haidong Li1,2, Jian Chen1, Lei Qiao3,4

1Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, PR China
2College of Earth Sciences, Jilin University, Changchun 130061, PR China
3Hydrometeorology and Remote Sensing Laboratory, University of Oklahoma, Norman, Oklahoma 73019, USA
4Atmospheric Radar Research Center, University of Oklahoma, Norman, Oklahoma 73072, USA

ABSTRACT: To study typhoon-induced variations in chlorophyll a (chl a) distribution, 2 surveys were conducted on the inner shelf of the East China Sea, and 3 remote sensing images were selected before and after the passage of Typhoon Morakot. Chl a was predominantly present in coastal waters and the euphotic zone during normal, pre-typhoon conditions at a concentration >0.7 mg m-3. After the passage of the typhoon, the chl a concentration drastically declined to <0.5 mg m-3, except for in the surface layer in coastal areas, where the concentration of chl a was >1.0 mg m-3 due to the abundant fresh water supply from typhoon-induced runoff. Remote sensing data indicated that under normal conditions, the concentration of surface chl a was ~1.0 mg m-3, whereas it increased to >10.0 mg m-3 post-typhoon. A typhoon-initiated chl a increase showed a delay of ~4 to 7 d. A 3-stage conceptual model is proposed to describe the time-evolution of chl a. The first stage is the normal, pre-typhoon condition. The second stage is the typhoon-active period, when chl a generally decreases due to the presence of opposing factors, such as increasing turbidity and cloud cover, while in the coastal surface water layer, chl a is increased due to the fresh water supply. The third stage is the post-typhoon condition, when the opposing factors disappear and an increase in nutrient supply causes an increase in chl a.

KEY WORDS: Typhoons · Morakot · Chlorophyll a · East China Sea · Field observation · Remote sensing

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Cite this article as: Li Y, Ye X, Wang A, Li H, Chen J, Qiao L (2013) Impact of Typhoon Morakot on chlorophyll a distribution on the inner shelf of the East China Sea. Mar Ecol Prog Ser 483:19-29.

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