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General Session 2: Marine & estuarine biogeochemistry |
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The monthly variations of dissolved oxygen distribution off the Changjiang River Estuary and its adjacent waters
GS2-04-S
Lianbao Chi* , Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences
Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology
University of Chinese Academy of Sciences
Zhiming Yu, Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences
Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology
Xihua Cao, Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences
Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology
Xiuxian Song, Key laboratory of marine ecology and environmental sciences, Chinese Academy of Sciences
Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology
Presenter Email: chilianbaobio@163.com
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| Hypoxia off the Changjiang River Estuary (CRE) and its adjacent waters was a serious problem£¬which attracted much attentions from both academic and public. It was all known that there were great changes of hypoxia in this area seasonally. However, monthly variation of the dissolved oxygen (DO) distribution in this area was few reported. In this research, the monthly cruises were conducted off the CRE and its adjacent waters (122.00-123.60¡£E£¬28.50-33.00¡£N) from February 2015 to January 2016. The result showed that DO values at the bottom waters ranged from 1.92 to 10.59 mg/L during the investigation. DO values was gradually decreased from February to May, with the DO values in the bottom water off the Zhejiang coast declined to less than 5mg/L in May. In addition, the influenced area of low DO (<5mg/L) expanded northward from Zhejiang coast. Hypoxia phenomenon (DO<3mg/L) became most seriously in August which covered an area of 15400 km2, and the minimum value of DO was only 1.92 mg/L. The hypoxic zone off the CRE exhibited the characteristics of discontinuous distribution, and presented a south (Zhejiang coast) and north (CRE) “dual-core” structure. Afterwards, hypoxic zone retreated southward and disappeared in December finally. Furthermore, there were different features in the formation, development and recession of hypoxia in the “dual-core”. Hypoxia in the north region covered a larger area but had a shorter duration compared to the hypoxia in the south region. The role of various factors in the process of formation, development and recession of hypoxia off the CRE and its adjacent waters remains to be further explored. |
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