Articles | Volume 18, issue 18
https://doi.org/10.5194/bg-18-5247-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-18-5247-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
28 Sep 2021
Research article |
| 28 Sep 2021
| 28 Sep 2021
Long-term spatiotemporal variations in and expansion of low-oxygen conditions in the Pearl River estuary: a study synthesizing observations during 1976–2017
Jiatang Hu
CORRESPONDING AUTHOR
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, China
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China
Zhongren Zhang
School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China
Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, B3H 4R2, Canada
Jia Huang
Zhongshan Research Institute of Environmental Protection Science Corporation Limited, Zhongshan, 528400, China
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22 citations as recorded by crossref.
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- Interannual variabilities, long-term trends, and regulating factors of low-oxygen conditions in the coastal waters off Hong Kong Z. Chen et al. 10.5194/bg-19-3469-2022
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- Spatiotemporal variations and influencing factors of river dissolved oxygen in Dongguan section of Dongjiang River, Pearl River Basin X. Chuang et al. 10.18307/2022.0510
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- Dissolved oxygen depletion in Chinese coastal waters W. Zhang et al. 10.1016/j.watres.2024.123004
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- Detection of periodicity, aperiodicity, and corresponding driving factors of river dissolved oxygen based on high-frequency measurements C. Xu et al. 10.1016/j.jhydrol.2022.127711
21 citations as recorded by crossref.
- A microcosm evaluation of metal cycling in an urbanized contaminated estuary varying with oxic-hypoxic-anoxic-reoxic transition: Behavior, fluxes, and mechanism Z. Jia et al. 10.1016/j.scitotenv.2024.172769
- Dissolved Oxygen Concentration Prediction in the Pearl River Estuary with Deep Learning for Driving Factors Identification: Temperature, pH, Conductivity, and Ammonia Nitrogen X. Liang et al. 10.3390/w16213090
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- Evaluating impacts of hydrology and pollution loadings on low dissolved oxygen in an urbanized tidal river network using modeling and monitoring H. Zhang et al. 10.1016/j.jhydrol.2025.133630
- Seasonal variation in the functional structure of demersal fish communities and response to the environmental changes in the Pearl River Estuary, China H. Lai et al. 10.1016/j.ecolind.2022.109525
- Declining particulate organic carbon flux to estuary yet rising oceanic flux over the past 20 years: A case study of the Pearl River Estuary Z. Wang et al. 10.1016/j.watres.2025.123332
- Spatiotemporal Configuration of Hydrographic Variability in Terminos Lagoon: Implications for Fish Distribution C. Paz-Ríos et al. 10.1007/s12237-023-01250-6
- Spatio-temporal analysis of aerosol optical depth and its response to drought and climatic variables in an arid environment: a case study of Saravan County, Iran M. Hemmati Moghadam et al. 10.1080/15324982.2025.2522205
- Evolution of hydrochemical characteristics and the influence of environmental background in the Hailar River basin, China F. Xie et al. 10.1007/s10661-024-13134-8
- Interannual variabilities, long-term trends, and regulating factors of low-oxygen conditions in the coastal waters off Hong Kong Z. Chen et al. 10.5194/bg-19-3469-2022
- Long-term trends in summer hypoxia and associated driving factors in the Pearl River Estuary, China Z. Lin et al. 10.1016/j.marpolbul.2024.117456
- Anthropogenic impact on long-term riverine CODMn, BOD, and nutrient flux variation in the Pearl River Delta S. Zhang & H. Zhang 10.1016/j.scitotenv.2022.160197
- Water quality assessment and pollution source apportionment using multivariate statistical and PMF receptor modeling techniques in a sub-watershed of the upper Yangtze River, Southwest China X. Ren et al. 10.1007/s10653-023-01477-z
- Spatiotemporal variations and influencing factors of river dissolved oxygen in Dongguan section of Dongjiang River, Pearl River Basin X. Chuang et al. 10.18307/2022.0510
- Effects of heatwave events on dissolved oxygen in the Elbe Estuary H. Fan et al. 10.1016/j.watres.2025.124125
- Drivers of Phytoplankton Variability in and Near the Pearl River Estuary, South China Sea During Typhoon Hato (2017): A Numerical Study Y. Feng et al. 10.1029/2022JG006924
- Persistent eutrophication and hypoxia in the coastal ocean M. Dai et al. 10.1017/cft.2023.7
- Spatiotemporal variations and controlling mechanism of low dissolved oxygen in a highly urbanized complex river system R. Ma et al. 10.1016/j.ejrh.2024.101691
- Disentangling the contributions of anthropogenic nutrient input and physical forcing to long-term deoxygenation off the Pearl River Estuary, China Z. Chen et al. 10.1016/j.watres.2024.122258
- Dissolved oxygen depletion in Chinese coastal waters W. Zhang et al. 10.1016/j.watres.2024.123004
- Behaviors of redox-sensitive tungsten and molybdenum in the northern South China Sea: From the Pearl River to the continental slope O. Dellwig et al. 10.1016/j.ecss.2023.108485
Latest update: 16 Jul 2025
Short summary
In situ observations over 42 years were used to explore the long-term changes to low-oxygen conditions in the Pearl River estuary. Apparent expansion of the low-oxygen conditions in summer was identified, primarily due to the combined effects of increased anthropogenic inputs and decreased sediment load. Large areas of severe low-oxygen events were also observed in early autumn and were formed by distinct mechanisms. The estuary seems to be growing into a seasonal, estuary-wide hypoxic zone.
In situ observations over 42 years were used to explore the long-term changes to low-oxygen...
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