Surface Seawater pCO2 Variation after a Typhoon Passage in the Kuroshio off Eastern Taiwan

Water

卷:14

Chun Hoe Chow¹  Wen-Chen Chou²  Gwo-Ching Gong²  Lan-Feng Fan² 

[1] Department of Marine Environment Informatics, National Taiwan Ocean University, Keelung 202301, Taiwan;

[2] Institute of Marine Environment and Ecology, National Taiwan Ocean University, Keelung 202301, Taiwan;

关键词: pCO₂;    typhoon;    Kuroshio;    cyclonic eddy;   

DOI  :  10.3390/w14091326

来源: DOAJ

【 摘 要 】

In this study, two cruises were conducted across the mainstream of the Kuroshio off eastern Taiwan before and after the passage of Typhoon Saola in summer 2012. The continuous underway pCO₂ (i.e., partial pressure of CO₂) measurements revealed that surface seawater pCO₂ (SS pCO₂) displayed spatial variations in response to typhoon passage. The simulated results showed that the mixed-layer deepening after typhoon passage had a minor effect on SS pCO₂ variation because pCO₂ decrease driven by temperature dropdown and enhanced biological production fueled by nutrients input was largely compensated by pCO₂ increase caused by salinity increase and dissolved inorganic carbon input from the subsurface layer. By contrast, the advection pattern showed significant change before and after the typhoon, which could play a major role in controlling the variation of SS pCO₂. In the exit area of the cyclonic eddy, SS pCO₂ decreased, while in the area of its arrival, SS pCO₂ increased. Besides, the discharge of freshwater and the intrusion of the South China Sea subsurface could result in SS pCO₂ increase in the nearshore area. The present study highlights that more advection changes need to be considered to better understand the impact of the typhoon on SS pCO₂, especially in the strong current area, such as the Kuroshio.

【 授权许可】

Unknown