[张贴报告]Heterogeneity of the sediment oxygen demand and its contribution to the hypoxia off the Changjiang estuary and its adjacent waters

Heterogeneity of the sediment oxygen demand and its contribution to the hypoxia off the Changjiang estuary and its adjacent waters
编号:2978 稿件编号:2551 访问权限:私有 更新:2023-04-12 19:18:10 浏览:134次 张贴报告

报告开始:2023年05月07日 09:17 (Asia/Shanghai)

报告时间:1min

所在会议:[SP] 张贴报告专场 » [SP-6-1] 6、海洋地球科学

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摘要
The severe hypoxia off the Changjiang estuary (CE) has a dual-core structure, and the two hypoxic zones exhibit behavioural, physical and biochemical differences. Currently, few studies have revealed straightforward differences regarding the key biochemical processes between these two hypoxic zones. In this study, the phytoplankton sinking rate (PSR) and sediment oxygen demand (SOD) were measured by field experiments and compared between the two hypoxic regions. PSR and SOD ranged from 0.75–3.34 m day− 1 and 5.67–16.19 mmol m− 2 day− 1 , respectively. Interestingly, PSR and SOD were higher in the southern region than in the northern region, implying stronger pelagic-benthic biogeochemical coupling in the southern region. SOD accounted for approximately 44% and 51% of DO net consumption in the northern and southern regions, respectively, from July to August. The southern hypoxic region appeared to exhibit intense DO consumption and fast DO supplementation, while the northern hypoxic region seemed to exhibit slow DO consumption and supplementation.
关键字
Heterogeneity,Phytoplankton sinking rates,Sediment oxygen demand,Hypoxia,Changjiang estuary
报告人
池连宝
中国科学院海洋研究所

稿件作者
池连宝 中国科学院海洋研究所
宋秀贤 中国科学院海洋研究所
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