Long-term trends in summer hypoxia and associated driving factors in the Pearl River Estuary, China

IF 5.3 3区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Marine pollution bulletin Pub Date : 2025-02-01 DOI:10.1016/j.marpolbul.2024.117456

Zhenkun Lin , Jiatang Hu , Leiping Ye , Yongsheng Cui , Jiaxue Wu

{"title":"Long-term trends in summer hypoxia and associated driving factors in the Pearl River Estuary, China","authors":"Zhenkun Lin , Jiatang Hu , Leiping Ye , Yongsheng Cui , Jiaxue Wu","doi":"10.1016/j.marpolbul.2024.117456","DOIUrl":null,"url":null,"abstract":"<div><div>In this study, we collected in situ water quality data during the summer months from 1985 to 2021 and surface sediment organic carbon and stable carbon isotope (δ<sup>13</sup>C) data from 2002 and 2020 in the Pearl River Estuary (PRE), to analyze long-term trends in hypoxia and explore changes in deoxygenation processes and their potential drivers. Our results showed that hypoxic events in the PRE transitioned from episodic in Lingdingyang Bay in the 2000s to periodic in the lower estuary by the late 2010s. During this transition, the dominant deoxygenation processes shifted from being caused by terrestrial and wastewater emissions to eutrophication. Increased wastewater discharge, reduced sediment load, weakened wind mixing and strengthened coastal upwelling are potential factors contributing to the changes in deoxygenation processes and the deterioration of hypoxic conditions. This study provides a scientific basis for formulating policies to mitigate hypoxia in large estuaries deeply affected by human activities.</div></div>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"211 ","pages":"Article 117456"},"PeriodicalIF":5.3000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Marine pollution bulletin","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0025326X24014334","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

In this study, we collected in situ water quality data during the summer months from 1985 to 2021 and surface sediment organic carbon and stable carbon isotope (δ¹³C) data from 2002 and 2020 in the Pearl River Estuary (PRE), to analyze long-term trends in hypoxia and explore changes in deoxygenation processes and their potential drivers. Our results showed that hypoxic events in the PRE transitioned from episodic in Lingdingyang Bay in the 2000s to periodic in the lower estuary by the late 2010s. During this transition, the dominant deoxygenation processes shifted from being caused by terrestrial and wastewater emissions to eutrophication. Increased wastewater discharge, reduced sediment load, weakened wind mixing and strengthened coastal upwelling are potential factors contributing to the changes in deoxygenation processes and the deterioration of hypoxic conditions. This study provides a scientific basis for formulating policies to mitigate hypoxia in large estuaries deeply affected by human activities.

Abstract Image

查看原文本刊更多论文

珠江口夏季缺氧的长期变化趋势及其驱动因素

利用1985 ~ 2021年夏季的原位水质数据和2002 ~ 2020年的表层沉积物有机碳和稳定碳同位素（δ13C）数据，分析了珠江口（PRE）缺氧的长期趋势，探讨了脱氧过程的变化及其潜在驱动因素。研究结果表明，到2010年代末，PRE缺氧事件在陵顶阳湾由2000年代的偶发性事件转变为河口下游的周期性事件。在这一转变过程中，主要的脱氧过程由陆地和废水排放引起转变为富营养化。污水排放增加、泥沙负荷减少、风混合减弱和海岸上升流增强是导致脱氧过程变化和缺氧条件恶化的潜在因素。本研究为制定应对受人类活动影响较大的河口缺氧的对策提供了科学依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Marine pollution bulletin 环境科学-海洋与淡水生物学

CiteScore

10.20

自引率

15.50%

发文量

1077

审稿时长

68 days

期刊介绍： Marine Pollution Bulletin is concerned with the rational use of maritime and marine resources in estuaries, the seas and oceans, as well as with documenting marine pollution and introducing new forms of measurement and analysis. A wide range of topics are discussed as news, comment, reviews and research reports, not only on effluent disposal and pollution control, but also on the management, economic aspects and protection of the marine environment in general.