基于高精度海洋动力模型的珠江口羽状流季节和年际变化规律研究

doi:10.11978/2018098

Abstract

Abstract:

Based on the sea surface salinity data from 1999 to 2010 simulated by the high-resolution Finite-Volume Community Ocean Model (FVCOM), the seasonal and interannual variability of river plume in the Pearl River Estuary was analyzed and the main dynamic factors related to the variability were also discussed in combination with Empirical Orthogonal Function (EOF) analysis in this study. The field observation data during the simulation period were used to verify the simulation results for the 12 years, and the verification results showed that the model had higher accuracy and simulated the extension and variability of the plume fairly well. The simulated results showed that the plume exhibited significant seasonal variability. Affected by the high river discharge and southwesterly wind, the summertime plume exhibited a bidirectional structure with the plume extending westward attaching to the coast and eastward detaching from the coast. The extension area of the summertime plume was the largest. In winter, the river discharge attenuated to a minimum and the wind field changed into strong northeasterly wind. Consequently, the plume was squeezed to the western coast tightly to form a narrow band with the smallest extension area. The spring and autumn periods were transitional seasons, and the plume in these two seasons exhibited westward alongshore spreading. The summertime plume exhibited significant interannual variability with three main patterns, namely, the eastward extension dominated, approximately symmetric extension and westward extension dominated. In spring, the interannual variability of the plume was followed by that in summer and the variability mostly occurred in the western region and river estuary. The interannual variability in autumn and winter was not significant, especially in winter. The first EOF mode could explain 91.2% of the total variance, corresponding to the change in river discharge. The second EOF mode could explain 4.1% of the total variance, corresponding to the change in prevailing wind.

Key words: plume, seasonal variability, interannual variability, EOF analysis, numerical model, Pearl River Estuary

CLC Number:

P731.21

Chuang XU,Yongji XU,Jiatang HU,Shiyu LI,Jintao LIU. Study on the seasonal and interannual variability of river plume in the Pearl River Estuary based on a high-resolution ocean dynamic model[J].Journal of Tropical Oceanography, 2019, 38(3): 43-52.

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Study on the seasonal and interannual variability of river plume in the Pearl River Estuary based on a high-resolution ocean dynamic model

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