Oceanography The Official Magazine of
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Volume 24 Issue 04

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Volume 24, No. 4
Pages 42 - 51


Biogeochemical Responses in the Southern East China Sea After Typhoons

By Chin-Chang Hung  and Gwo-Ching Gong 
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Article Abstract

To understand the biogeochemical impact of typhoons in marginal seas, 16 sea-going expeditions were conducted from 2007 to 2009, covering all four seasons and including periods following the passage of several typhoons in the southern East China Sea (SECS). Higher surface nitrate and chlorophyll a (Chl a) concentrations were measured in winter and spring, but surface nitrate (< 0.1 μM) and Chl a (0.47 ± 0.17 mg m–3) concentrations were low in summer under nontyphoon conditions. In comparison, elevated surface nitrate (0.2–2.3 μM) and Chl a concentrations (1.11 ± 0.40 mg m–3) were recorded in the SECS several days after the passage of each of three typhoons in 2008. The results demonstrate that nutrient-rich waters are brought to the surface after the passage of typhoons, after which phytoplankton flourish. Most importantly, elevated particulate organic carbon (POC) fluxes (552 ± 28 mg C m–2 d–1) were observed after Typhoon Jangmi, about a threefold increase from the monthly mean value (184 ± 37 mg m–2 d–1). These field investigations demonstrate that typhoons can have a profound effect on nutrient supply, phytoplankton growth, and POC fluxes in marginal seas.


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