The apparent quantum yields of dissolved organic matter photobleaching and photomineralization in the Changjiang River Estuary

Sun Xin; Song Guisheng; Xie Huixiang

doi:10.3969/j.issn.0253-4193.2016.04.011

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Sun Xin, Song Guisheng, Xie Huixiang. The apparent quantum yields of dissolved organic matter photobleaching and photomineralization in the Changjiang River Estuary[J]. Haiyang Xuebao, 2016, 38(4): 120-129. doi: 10.3969/j.issn.0253-4193.2016.04.011

Citation:

Sun Xin, Song Guisheng, Xie Huixiang. The apparent quantum yields of dissolved organic matter photobleaching and photomineralization in the Changjiang River Estuary[J]. Haiyang Xuebao, 2016, 38(4): 120-129. doi: 10.3969/j.issn.0253-4193.2016.04.011

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The apparent quantum yields of dissolved organic matter photobleaching and photomineralization in the Changjiang River Estuary

doi: 10.3969/j.issn.0253-4193.2016.04.011

1.
College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China
2.
College of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China;Institut des sciences de la mer de Rimouski, Université du Québec  Rimouski, Rimouski, Québec G5L 3A1, Canada

Received Date: 2015-11-03
Rev Recd Date: 2015-12-24

Abstract

Abstract

Exposure of dissolved organic matter (DOM) to irradiation leads to the losses of absorbance (photobleaching) and carbon (photomineralization),thereby impacting the optics and carbon cycle in aquatic environments. In this study,the apparent quantum yields (AQY) of DOM photodegradation in the Changjiang River Estuary and its adjacent sea was investigated to evaluate the variation character of DOM photodegradation in the estuarine and coastal waters. AQY of DOM photodegradation gradually decreases seaward and the photobleaching rate of chromophoric DOM (CDOM) is about ten times that of dissolved organic carbon (DOC) photomineralization along the entire estuary. The significant negative linear correlation between the Φ_ble (solar spectrum-weighted mean apparent quantum yield of CDOM photobleaching, or Φ_min:solar spectrum-weighted mean apparent quantum yield of DOC photomineralization) and salinity in the region seaward from the turbidity maximum zone,as well as the significant positive linear correlations between Φ_ble(or Φ_min) and SUVA₂₅₄ indicated the physical mixing process should be the dominant factor in controlling the photoreactivity of DOM along the Changjiang River Estuary and the photoreactivity of terrestrial DOM was higher than that of marine-derived DOM. AQY of DOM photodegradation in the lower section was much lower than that in the upper section. The action spectra of DOM phodegradation was characterized as a non-Gaussian style,with the peak response located around 330 nm. The wavelength integrated result demonstrated UVA is the main contributor to DOM photodegradation. This study will provide help to improve the carbon flux model in the East China Sea.
- dissolved organic matter,
- photobleaching,
- photomineralization,
- apparent quantum yields (AQY),
- Changjiang River Estuary

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