Hypoxia in the East China Sea: One of the largest coastal low-oxygen areas in the world

Chung Chi Chen; Gwo Ching Gong; Fuh Kwo Shiah

doi:10.1016/j.marenvres.2007.01.007

Hypoxia in the East China Sea: One of the largest coastal low-oxygen areas in the world

Chung Chi Chen^*
, Gwo Ching Gong
, Fuh Kwo Shiah

^*Corresponding author for this work

Department of Life Science

Research output: Contribution to journal › Article › peer-review

399 Citations (Scopus)

Abstract

Anoxia and hypoxia have been widely observed in estuarine and coastal regions over the past few decades; however, few reports have focused on the East China Sea (ECS). In June and August 2003, two cruises sampled at stations covering almost the entire shelf of the ECS to examine hypoxic events and their potential causes. In August, DO concentrations <2-3 mg l^-1 covered an area estimated at greater than 12,000 km² (or 432 km³ volume). In contrast, water column DO concentrations exceeded 4 mg l^-1 throughout most of the shelf region. A sharp density gradient was observed under the mixed layer in August, restricting vertical re-aeration across this strong pycnocline. Oxygen depletion events, such as that described here for the ECS shelf, are fueled by decomposition of newly produced marine and river-borne biogenic substances (as well as older residual organic matter) deposited to the bottom waters.

Original language	English
Pages (from-to)	399-408
Number of pages	10
Journal	Marine Environmental Research
Volume	64
Issue number	4
DOIs	https://doi.org/10.1016/j.marenvres.2007.01.007
Publication status	Published - 2007 Oct

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 14 Life Below Water

Keywords

Chlorophyll
Coastal zone
Dissolved oxygen
Hypoxia
Oxygen depletion
The Changjiang (Yangtze) Estuary
The East China Sea

ASJC Scopus subject areas

Oceanography
Aquatic Science
Pollution

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10.1016/j.marenvres.2007.01.007

Cite this

@article{d956872dca024d488f963894bd2ef5ce,

title = "Hypoxia in the East China Sea: One of the largest coastal low-oxygen areas in the world",

abstract = "Anoxia and hypoxia have been widely observed in estuarine and coastal regions over the past few decades; however, few reports have focused on the East China Sea (ECS). In June and August 2003, two cruises sampled at stations covering almost the entire shelf of the ECS to examine hypoxic events and their potential causes. In August, DO concentrations <2-3 mg l-1 covered an area estimated at greater than 12,000 km2 (or 432 km3 volume). In contrast, water column DO concentrations exceeded 4 mg l-1 throughout most of the shelf region. A sharp density gradient was observed under the mixed layer in August, restricting vertical re-aeration across this strong pycnocline. Oxygen depletion events, such as that described here for the ECS shelf, are fueled by decomposition of newly produced marine and river-borne biogenic substances (as well as older residual organic matter) deposited to the bottom waters.",

keywords = "Chlorophyll, Coastal zone, Dissolved oxygen, Hypoxia, Oxygen depletion, The Changjiang (Yangtze) Estuary, The East China Sea",

author = "Chen, \{Chung Chi\} and Gong, \{Gwo Ching\} and Shiah, \{Fuh Kwo\}",

note = "Funding Information: This research was supported by the National Science Council (NSC), Taiwan under Grant Nos. NSC-93-2611-M003-001 and NSC-94-2611-M003-001 to C.-C. Chen. This work done by G.-C. Gong was supported under Grant No. NSC-95-2611-M-019-020-MY3 and by the Center for Marine Bioscience and Biotechnology at NTOU. We would like to thank Miss Y.-F. Tseng, C.-J. Tseng, and Mr. K.-J. Liu for assistance with the analyses of dissolved oxygen, nutrients, and chlorophyll a measurement. The authors are also grateful to Prof. W.M. Kemp and two anonymous reviewers for providing valuable and constructive comments to improve the manuscript. We are also indebted to the officers and crew of the Ocean Researcher I for their assistance. Part of this work done by C.-C. Chen was also supported by the NSC, Taiwan under Grant No. NSC-95-2918-I-003-007 as a visiting scientist at Horn Point Laboratory, University of Maryland Center for Environmental Science. ",

year = "2007",

month = oct,

doi = "10.1016/j.marenvres.2007.01.007",

language = "English",

volume = "64",

pages = "399--408",

journal = "Marine Environmental Research",

issn = "0141-1136",

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T1 - Hypoxia in the East China Sea

T2 - One of the largest coastal low-oxygen areas in the world

AU - Chen, Chung Chi

AU - Gong, Gwo Ching

AU - Shiah, Fuh Kwo

N1 - Funding Information: This research was supported by the National Science Council (NSC), Taiwan under Grant Nos. NSC-93-2611-M003-001 and NSC-94-2611-M003-001 to C.-C. Chen. This work done by G.-C. Gong was supported under Grant No. NSC-95-2611-M-019-020-MY3 and by the Center for Marine Bioscience and Biotechnology at NTOU. We would like to thank Miss Y.-F. Tseng, C.-J. Tseng, and Mr. K.-J. Liu for assistance with the analyses of dissolved oxygen, nutrients, and chlorophyll a measurement. The authors are also grateful to Prof. W.M. Kemp and two anonymous reviewers for providing valuable and constructive comments to improve the manuscript. We are also indebted to the officers and crew of the Ocean Researcher I for their assistance. Part of this work done by C.-C. Chen was also supported by the NSC, Taiwan under Grant No. NSC-95-2918-I-003-007 as a visiting scientist at Horn Point Laboratory, University of Maryland Center for Environmental Science.

PY - 2007/10

Y1 - 2007/10

N2 - Anoxia and hypoxia have been widely observed in estuarine and coastal regions over the past few decades; however, few reports have focused on the East China Sea (ECS). In June and August 2003, two cruises sampled at stations covering almost the entire shelf of the ECS to examine hypoxic events and their potential causes. In August, DO concentrations <2-3 mg l-1 covered an area estimated at greater than 12,000 km2 (or 432 km3 volume). In contrast, water column DO concentrations exceeded 4 mg l-1 throughout most of the shelf region. A sharp density gradient was observed under the mixed layer in August, restricting vertical re-aeration across this strong pycnocline. Oxygen depletion events, such as that described here for the ECS shelf, are fueled by decomposition of newly produced marine and river-borne biogenic substances (as well as older residual organic matter) deposited to the bottom waters.

AB - Anoxia and hypoxia have been widely observed in estuarine and coastal regions over the past few decades; however, few reports have focused on the East China Sea (ECS). In June and August 2003, two cruises sampled at stations covering almost the entire shelf of the ECS to examine hypoxic events and their potential causes. In August, DO concentrations <2-3 mg l-1 covered an area estimated at greater than 12,000 km2 (or 432 km3 volume). In contrast, water column DO concentrations exceeded 4 mg l-1 throughout most of the shelf region. A sharp density gradient was observed under the mixed layer in August, restricting vertical re-aeration across this strong pycnocline. Oxygen depletion events, such as that described here for the ECS shelf, are fueled by decomposition of newly produced marine and river-borne biogenic substances (as well as older residual organic matter) deposited to the bottom waters.

KW - Chlorophyll

KW - Coastal zone

KW - Dissolved oxygen

KW - Hypoxia

KW - Oxygen depletion

KW - The Changjiang (Yangtze) Estuary

KW - The East China Sea

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U2 - 10.1016/j.marenvres.2007.01.007

DO - 10.1016/j.marenvres.2007.01.007

M3 - Article

C2 - 17448532

AN - SCOPUS:34548126183

SN - 0141-1136

VL - 64

SP - 399

EP - 408

JO - Marine Environmental Research

JF - Marine Environmental Research

IS - 4

ER -

Hypoxia in the East China Sea: One of the largest coastal low-oxygen areas in the world

Abstract

UN SDGs

Keywords

ASJC Scopus subject areas

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