Impact of Typhoon Morakot on chlorophyll a distribution on the inner shelf of the East China Sea
Year: 2013
Type: article
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 typhoonactive 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.
Source: Marine Ecology Progress Series
DOI: 10.3354/meps10223
Language: English
Subfield: Oceanography
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2322965175