Variation of nutrients in response to the highly dynamic suspended particulate matter in the Changjiang (Yangtze River) plume |
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| Authors: | Lei Gao Dao-Ji Li Ping-Xing Ding |
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| Institution: | aState Key Laboratory of Estuarine and Coastal Research, East China Normal University, 3663 North Zhongshan Road, Shanghai 200062, PR China;bState Key Laboratory of Marine Geology, Tongji University, 1239 Siping Road, Shanghai 200092, PR China |
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| Abstract: | During four surveys at spring and neap tides in July and November 2005, continuous observations were conducted at four stations adjacent to the Changjiang (Yangtze River) mouth. The observation times lasted for 26 h that covered two consecutive semidiurnal cycles. Resuspension events and subsequently enhancements of suspended particulate matter (SPM) were commonly observed within a tidal cycle. Although nutrients (SiO32−, NO3−, and PO43−) were primarily governed by salinity, their statistically significant correlations with SPM could always be extracted after partial correlation analysis. Three parameter (salinity, SPM, nutrients) regressions generally produced better results of simulating nutrient concentrations than two parameter (salinity and nutrients) regressions, although compared to the latter, the former R2 values were elevated by no more than 13%. The partial correlation between SPM and a specific nutrient could be either positive or negative in different surveys, suggesting SPM influenced the nutrients in different ways under various conditions. The minor (albeit statistically significant) impacts of highly dynamic SPM on nutrients might be ascribed to the short duration time of resuspension events and estuarine mixing process, together with the complex nature of circulation in the Changjiang plume seawater. |
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| Keywords: | Nutrients Suspended particulate matter Semidiurnal tides Resuspension Partial correlation analysis Changjiang Estuary |
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