伶仃洋夏季叶绿素a时间变化特征及分析

doi:10.11978/2021043

Abstract

Abstract:

We used the continuous in-situ air pressure, temperature, sea-surface wind, sea-surface temperature, salinity, chlorophyll a, current observation data, satellite rainfall data, and moderate resolution imaging spectroradiometer (MODIS) visible band images to analyze the characteristics of sea-surface chlorophyll a in Lingding Bay of the Pearl River Estuary, during the study period of July 5 - 20, 2019. The methods of wavelet analysis and ensemble empirical mode decomposition (EEMD) are used. The results showed that the concentration of chlorophyll a during the observation period varied from 0.44 to 1.75 µg·L^-1, with an average value of 0.80 µg·L^-1. The periods of the signals in the time series of chlorophyll a were 6, 12 and 24 h. It is obvious that there was a phase relationship between chlorophyll a and tidal current, which would be changed by the rainfall over the Pearl River basin. In the study period, chlorophyll a was in an inverse phase relationship with the tidal current, which means that the chlorophyll a concentration reached maximum (minimum) with the maximum flow in the ebb (rising) tide. The difference of chlorophyll a concentration in the ebb and rising tides was about 0.3 µg·L^-1. When rainfall occurred in the Pearl River Basin from July 8 to 13, chlorophyll a concentration increased from 0.02 ~ 0.09 µg·L^-1 to about 0.15 µg·L^-1 at the periods of 6, 12 and 24 h. Furthermore, the chlorophyll a concentration in the Pearl River Estuary increased by about 0.3 µg·L^-1 for 80 h after the rainfall. After the rainfall, the time series of tidal current lagged behind chlorophyll a for about 6 h from July 13 to 20. The concentration of chlorophyll a reached minimum (maximum) with high (low) tide. The results present that rainfall not only increased the chlorophyll a in the estuary, but also induced the transformation of the phase relationship between chlorophyll a and tidal current.

Key words: Pearl River Estuary, Lingding Bay, chlorophyll a, tidal cycle, rainfall

CLC Number:

P735.12

ZENG Dianting, LI Junyi, XIE Lingling, YE Xiaomin, ZHOU Da. Analysis of temporal characteristics of chlorophyll a in Lingding Bay during summer[J].Journal of Tropical Oceanography, 2022, 41(2): 16-25.

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Analysis of temporal characteristics of chlorophyll a in Lingding Bay during summer

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