A preliminary analysis on the dynamic characteristics of the hypoxic zone adjacent to the Changjiang Estuary in summer

WEI Qin-sheng; YU Zhi-gang; XIA Chang-shui; ZANG Jia-ye; RAN Xiang-bin; ZHANG Xue-lei

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Article Navigation > Haiyang Xuebao > 2011 > 33(6): 100-109

WEI Qin-sheng, YU Zhi-gang, XIA Chang-shui, ZANG Jia-ye, RAN Xiang-bin, ZHANG Xue-lei. A preliminary analysis on the dynamic characteristics of the hypoxic zone adjacent to the Changjiang Estuary in summer[J]. Haiyang Xuebao, 2011, 33(6): 100-109.

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A preliminary analysis on the dynamic characteristics of the hypoxic zone adjacent to the Changjiang Estuary in summer

1.
Key Laboratory of Science and Engineering for Marine Ecological Environment,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China
2.
Key Laboratory of Marine Chemistry Theory and Technology,Ministry of Education,Ocean University of China,Qingdao 266100,China
3.
Key Laboratory of Science and Engineering for Marine Ecological Environment,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China;Key Laboratory of Marine Science and Numerical Modeling,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China
4.
Key Laboratory of Science and Engineering for Marine Ecological Environment,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,China

Received Date: 2010-06-13
Rev Recd Date: 2010-12-29

Abstract

Abstract

The research and analysis on the dynamic characteristics of the hypoxic zone adjacent to the Changjiang Estuary are of greatly scientific and practical significance to the sustainable development of the Changjiang River Delta.Through the analysis on the historical data in typical months of the hypoxic zone and the marine ecological environment evolution off the Changjiang Estuary,the trends that the hypoxic zone moved northward,dissolved oxygen minimum value volatility decreased and the hypoxic area was growing were fully revealed from the time scale,meanwhile,the relationships between the evolution of the hypoxic zone and the eutrophication and the hydrodynamic environment were expounded,besides,the changing process of the hypoxic zone location in different months in summer half year(June-October)of 2006 was also discussed.The results show that the trend that the hypoxic zone moved northward(that is, the hypoxic zone extended to the southwestern area of the southern Huanghai Sea)was dominated by the eutrophication and the hydrological power variation,the enhanced northward expansion trend was a result of the long-term evolution of the ecological environment adjacent to the Changjiang Estuary,the enhancement of the Taiwan Warm Current and the northward moving of the upwelling area associated to it play a crucial role in the decadal variability of the core location of the hypoxic zone;the monthly variation of the currents and the changing of the phytoplankton biomass intensive areas adjacent to the Changjiang estuary affected the hypoxic zone location in summer half year to some extent.
- Changjiang Estuary,
- hypoxic zone,
- dynamic characteristics,
- northward moving,
- eutrophication,
- hydrodynamics

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