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The impact of typhoons on the biogeochemistry of dissolved organic matter in eutrophic bays in northwestern South China Sea

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Acta Oceanologica Sinica 2024年第6期43卷 15-31页

作者： Xuan Lu Qibin Lao Fajin Chen Guangzhe Jin Chunqing Chen Qingmei Zhu College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524088China Polar and Marine Research Institute College of Harbor and Coastal EngineeringJimei UniversityXiamen 361021China Key Laboratory for Coastal Ocean Variation and Disaster Prediction Guangdong Ocean UniversityZhanjiang 524088China Key Laboratory of Climate Resources and Environment in Continental Shelf Sea and Deep SeaDepartment of Education of Guangdong ProvinceGuangdong Ocean UniversityZhanjiang 524088China

Highly productive estuaries facilitate intense decomposition of dissolved organic matter(DOM) as a carbon ***,the specific impacts of typhoons on DOM decomposition in eutrophic bays remain *** address this issue,we investigated the spectral characteristics of DOM before and after Typhoon Ewiniar in Zhanjiang B ay,a eutrophic semi-enclosed bay in the northwestern South China *** results revealed that intense microbial decomposition of DOM occurred during the pre-typhoon period because high nutrient inputs facilitated the mobilization of DOM in the ***,the intrusion of external seawater induced by the typhoon diluted the nutrient levels in Zhanjiang B ay,reducing the impact of microbial decomposition on DOM during the post-typhoon perio ***,the net addition of DOM occurred in Zhanjiang Bay during the post-typhoon period,possibly because of the decomposition of particulate organic matter(POM) and desorption of particulate *** addition,an increase in apparent oxygen utilization,a decrease in DO saturation and the reduced level of Chl a indicated that organic matter(OM) decomposition was enhanced and OM decomposition shifted to POM decomposition in Zhanjiang Bay after the ***,our study highlighted the shift in the intense OM decomposition from DOM to POM decomposition before and after typhoons in eutrophic bays,providing new insights into the response of typhoons to biogeo chemistry.

关键词： dissolved organic matter optical analyses decomposition typhoon northwestern South China Sea

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