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Inter-annual variability of hypoxic conditions in a shallow estuary
Lin, J; Xu, HZ; Cudaback, C; Wang, DX; jlin3@ncsu.edu
2008
发表期刊JOURNAL OF MARINE SYSTEMS
ISSN0924-7963
卷号73期号:40545页码:169-184
摘要Water quality data from two monitoring programs in the Pamlico River Estuary (PRE) were analyzed for dissolved oxygen (DO), salinity, temperature, and nutrient concentrations. Data were collected bi-weekly at 8 stations from 1997 to 2003 by East Carolina University and continuously at three stations from 1999 to 2003 by the U.S. Geological Survey. Hypoxic conditions were observed mostly in the upper to middle estuary, but the frequency of hypoxic events varied between years. During June to October in 1997-1999 (referred to as the oxic summers) bottom water hypoxia (DO <2 mg l(-1)) was found in 8.7% of the observations. By contrast, during June to October in 2001-2003 (referred to as the hypoxic summers), 37.9% of the total measurements had DO concentrations less than 2 mg l(-1). The more frequent and/or prolonged hypoxic conditions during the hypoxic summers were closely associated with stronger salinity stratification and greater loadings of nutrient and particulate matter. Salinity stratification appeared to be governed by patterns of freshwater discharge, and frequency of wind mixing events. The "oxic" summers were characterized by continuous low freshwater inflow (except one extremely high flow event due to hurricanes), stronger northeastward wind, and more frequent wind mixing events. In contrast, the hypoxic summers were characterized by frequent moderate freshwater inflow events, and fewer wind mixing events. The greater loadings of nutrient (nitrate, ammonium, and phosphate) and particulate matter during the hypoxic summers were primarily due to higher river discharges. At the head of the PRE, no significant differences were found in concentrations of nutrient and particulate nitrogen between the oxic and the hypoxic summers. In addition, chlorophyll a concentrations were averaged above 30 mu g l(-1) (maximum 167 mu g l(-1)) during the hypoxic summers, significantly higher than those during the oxic summers (averaged around 15 mu g l(-1)). (C) 2007 Elsevier B.V. All rights reserved.
部门归属[Lin, Jing; Xu, Hongzhou; Cudaback, Cynthia] N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA; [Lin, Jing] E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China; [Xu, Hongzhou; Wang, Dongxiao] Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China; [Xu, Hongzhou] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
关键词Hypoxia Dissolved Oxygen Inter-annual Variability Estuary Pamlico River
学科领域Geosciences, Multidisciplinary ; Marine & Freshwater Biology ; Oceanography
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收录类别sci
WOS记录号WOS:000259130000013
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/5362
专题海洋生物
通讯作者jlin3@ncsu.edu
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Lin, J,Xu, HZ,Cudaback, C,et al. Inter-annual variability of hypoxic conditions in a shallow estuary[J]. JOURNAL OF MARINE SYSTEMS,2008,73(40545):169-184.
APA Lin, J,Xu, HZ,Cudaback, C,Wang, DX,&jlin3@ncsu.edu.(2008).Inter-annual variability of hypoxic conditions in a shallow estuary.JOURNAL OF MARINE SYSTEMS,73(40545),169-184.
MLA Lin, J,et al."Inter-annual variability of hypoxic conditions in a shallow estuary".JOURNAL OF MARINE SYSTEMS 73.40545(2008):169-184.
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