Response of chromophoric dissolved organic matter dynamics to tidal oscillations and anthropogenic disturbances in a large subtropical estuary

Yongqiang  Zhou; Yuan Li; Xiaolong Yao; Wenhao Ding; Yibo Zhang; Erik Jeppesen; Yunlin Zhang; David C.  Podgorski; Chunmei Chen; Yi Ding; Huawu Wu; Robert G.M. Spencer

doi:10.1016/j.scitotenv.2019.01.220

Response of chromophoric dissolved organic matter dynamics to tidal oscillations and anthropogenic disturbances in a large subtropical estuary

Yongqiang Zhou, Yuan Li, Xiaolong Yao, Wenhao Ding, Yibo Zhang, Erik Jeppesen, Yunlin Zhang, David C. Podgorski, Chunmei Chen, Yi Ding, Huawu Wu, Robert G.M. Spencer

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43 Citations (Scopus)

Abstract

Estuaries support the livelihood of ~75% of the world's population and maintain high primary production in coastal waters, which are often subjected to strong tides and anthropogenic disturbances. There is a paucity of information on how the optical composition and bioavailability of chromophoric dissolved organic matter (CDOM) are influenced by tidal oscillations in estuaries with highly urbanized surrounding areas. We examined the semi-diurnal Qiantang Bore, one of the Earth's three most predominant tide bores, and found that dissolved organic carbon (DOC), CDOM absorption a(254) and terrestrial humic-like C1, tryptophan-like C2 and C5, fulvic-like C3, and microbial humic-like C4 decreased markedly with increasing salinity. This suggests that physical mixing of riverine freshwater and saltwater can shape the optical composition of CDOM in the estuary. This was supported by the semi-diurnally and hourly observations at Zhijiang (salinity ~0.1‰ upstream of the estuary) that DOC, bioavailable DOC (BDOC), C1–C2, and C4–C5 increased markedly with decreasing tidal level, while DOC and C1–C5 increased notably with increasing salinity. We further found δ ¹⁸ O was enriched with increasing tidal level, while tryptophan-like C2 and C5, and fulvic-like C3 decreased significantly with increasing tidal level at Zhapu (salinity ~7‰ downstream of the estuary). Furthermore, DOC, BDOC, C1, and C4 decreased, while δ ¹⁸ O and C3 increased markedly with increasing salinity. Further evidences come from the notably lower mean first principal component (PC1) scores at Zhijiang and Zhapu, both positively associated with anthropogenic tryptophan-like inputs, were observed during ebb than during flood tides, and PC1 at Zhijiang increased notably with increasing salinity. We conclude that anthropogenic inputs contributed primarily to the CDOM pool in the estuary and are mediated by the physical mixing of riverine freshwater and seawater, and ebb tides are often associated with enhanced anthropogenic CDOM with relatively high bioavailability.

Original language	English
Journal	Science of the Total Environment
Volume	662
Pages (from-to)	769-778
Number of pages	10
ISSN	0048-9697
DOIs	https://doi.org/10.1016/j.scitotenv.2019.01.220
Publication status	Published - 2019

Keywords

Chromophoric dissolved organic matter (CDOM)
Parallel factor analysis (PARAFAC)
Qiantang estuary
Tidal oscillations
Ultrahigh resolution mass spectrometry

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10.1016/j.scitotenv.2019.01.220

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Zhou, Y., Li, Y., Yao, X., Ding, W., Zhang, Y., Jeppesen, E., Zhang, Y., Podgorski, D. C., Chen, C., Ding, Y., Wu, H., & Spencer, R. G. M. (2019). Response of chromophoric dissolved organic matter dynamics to tidal oscillations and anthropogenic disturbances in a large subtropical estuary. Science of the Total Environment, 662, 769-778. https://doi.org/10.1016/j.scitotenv.2019.01.220

@article{50a9b910421e4b97ab8d8f2dc03463e7,

title = "Response of chromophoric dissolved organic matter dynamics to tidal oscillations and anthropogenic disturbances in a large subtropical estuary",

abstract = "Estuaries support the livelihood of ~75% of the world's population and maintain high primary production in coastal waters, which are often subjected to strong tides and anthropogenic disturbances. There is a paucity of information on how the optical composition and bioavailability of chromophoric dissolved organic matter (CDOM) are influenced by tidal oscillations in estuaries with highly urbanized surrounding areas. We examined the semi-diurnal Qiantang Bore, one of the Earth's three most predominant tide bores, and found that dissolved organic carbon (DOC), CDOM absorption a(254) and terrestrial humic-like C1, tryptophan-like C2 and C5, fulvic-like C3, and microbial humic-like C4 decreased markedly with increasing salinity. This suggests that physical mixing of riverine freshwater and saltwater can shape the optical composition of CDOM in the estuary. This was supported by the semi-diurnally and hourly observations at Zhijiang (salinity ~0.1‰ upstream of the estuary) that DOC, bioavailable DOC (BDOC), C1–C2, and C4–C5 increased markedly with decreasing tidal level, while DOC and C1–C5 increased notably with increasing salinity. We further found δ 18 O was enriched with increasing tidal level, while tryptophan-like C2 and C5, and fulvic-like C3 decreased significantly with increasing tidal level at Zhapu (salinity ~7‰ downstream of the estuary). Furthermore, DOC, BDOC, C1, and C4 decreased, while δ 18 O and C3 increased markedly with increasing salinity. Further evidences come from the notably lower mean first principal component (PC1) scores at Zhijiang and Zhapu, both positively associated with anthropogenic tryptophan-like inputs, were observed during ebb than during flood tides, and PC1 at Zhijiang increased notably with increasing salinity. We conclude that anthropogenic inputs contributed primarily to the CDOM pool in the estuary and are mediated by the physical mixing of riverine freshwater and seawater, and ebb tides are often associated with enhanced anthropogenic CDOM with relatively high bioavailability. ",

keywords = "Chromophoric dissolved organic matter (CDOM), Parallel factor analysis (PARAFAC), Qiantang estuary, Tidal oscillations, Ultrahigh resolution mass spectrometry",

author = "Yongqiang Zhou and Yuan Li and Xiaolong Yao and Wenhao Ding and Yibo Zhang and Erik Jeppesen and Yunlin Zhang and Podgorski, {David C.} and Chunmei Chen and Yi Ding and Huawu Wu and Spencer, {Robert G.M.}",

year = "2019",

doi = "10.1016/j.scitotenv.2019.01.220",

language = "English",

volume = "662",

pages = "769--778",

journal = "Science of the Total Environment",

issn = "0048-9697",

publisher = "Elsevier B.V.",

}

Zhou, Y, Li, Y, Yao, X, Ding, W, Zhang, Y, Jeppesen, E, Zhang, Y, Podgorski, DC, Chen, C, Ding, Y, Wu, H & Spencer, RGM 2019, 'Response of chromophoric dissolved organic matter dynamics to tidal oscillations and anthropogenic disturbances in a large subtropical estuary', Science of the Total Environment, vol. 662, pp. 769-778. https://doi.org/10.1016/j.scitotenv.2019.01.220

Response of chromophoric dissolved organic matter dynamics to tidal oscillations and anthropogenic disturbances in a large subtropical estuary. / Zhou, Yongqiang ; Li, Yuan; Yao, Xiaolong et al.
In: Science of the Total Environment, Vol. 662, 2019, p. 769-778.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Response of chromophoric dissolved organic matter dynamics to tidal oscillations and anthropogenic disturbances in a large subtropical estuary

AU - Zhou, Yongqiang

AU - Li, Yuan

AU - Yao, Xiaolong

AU - Ding, Wenhao

AU - Zhang, Yibo

AU - Jeppesen, Erik

AU - Zhang, Yunlin

AU - Podgorski, David C.

AU - Chen, Chunmei

AU - Ding, Yi

AU - Wu, Huawu

AU - Spencer, Robert G.M.

PY - 2019

Y1 - 2019

N2 - Estuaries support the livelihood of ~75% of the world's population and maintain high primary production in coastal waters, which are often subjected to strong tides and anthropogenic disturbances. There is a paucity of information on how the optical composition and bioavailability of chromophoric dissolved organic matter (CDOM) are influenced by tidal oscillations in estuaries with highly urbanized surrounding areas. We examined the semi-diurnal Qiantang Bore, one of the Earth's three most predominant tide bores, and found that dissolved organic carbon (DOC), CDOM absorption a(254) and terrestrial humic-like C1, tryptophan-like C2 and C5, fulvic-like C3, and microbial humic-like C4 decreased markedly with increasing salinity. This suggests that physical mixing of riverine freshwater and saltwater can shape the optical composition of CDOM in the estuary. This was supported by the semi-diurnally and hourly observations at Zhijiang (salinity ~0.1‰ upstream of the estuary) that DOC, bioavailable DOC (BDOC), C1–C2, and C4–C5 increased markedly with decreasing tidal level, while DOC and C1–C5 increased notably with increasing salinity. We further found δ 18 O was enriched with increasing tidal level, while tryptophan-like C2 and C5, and fulvic-like C3 decreased significantly with increasing tidal level at Zhapu (salinity ~7‰ downstream of the estuary). Furthermore, DOC, BDOC, C1, and C4 decreased, while δ 18 O and C3 increased markedly with increasing salinity. Further evidences come from the notably lower mean first principal component (PC1) scores at Zhijiang and Zhapu, both positively associated with anthropogenic tryptophan-like inputs, were observed during ebb than during flood tides, and PC1 at Zhijiang increased notably with increasing salinity. We conclude that anthropogenic inputs contributed primarily to the CDOM pool in the estuary and are mediated by the physical mixing of riverine freshwater and seawater, and ebb tides are often associated with enhanced anthropogenic CDOM with relatively high bioavailability.

AB - Estuaries support the livelihood of ~75% of the world's population and maintain high primary production in coastal waters, which are often subjected to strong tides and anthropogenic disturbances. There is a paucity of information on how the optical composition and bioavailability of chromophoric dissolved organic matter (CDOM) are influenced by tidal oscillations in estuaries with highly urbanized surrounding areas. We examined the semi-diurnal Qiantang Bore, one of the Earth's three most predominant tide bores, and found that dissolved organic carbon (DOC), CDOM absorption a(254) and terrestrial humic-like C1, tryptophan-like C2 and C5, fulvic-like C3, and microbial humic-like C4 decreased markedly with increasing salinity. This suggests that physical mixing of riverine freshwater and saltwater can shape the optical composition of CDOM in the estuary. This was supported by the semi-diurnally and hourly observations at Zhijiang (salinity ~0.1‰ upstream of the estuary) that DOC, bioavailable DOC (BDOC), C1–C2, and C4–C5 increased markedly with decreasing tidal level, while DOC and C1–C5 increased notably with increasing salinity. We further found δ 18 O was enriched with increasing tidal level, while tryptophan-like C2 and C5, and fulvic-like C3 decreased significantly with increasing tidal level at Zhapu (salinity ~7‰ downstream of the estuary). Furthermore, DOC, BDOC, C1, and C4 decreased, while δ 18 O and C3 increased markedly with increasing salinity. Further evidences come from the notably lower mean first principal component (PC1) scores at Zhijiang and Zhapu, both positively associated with anthropogenic tryptophan-like inputs, were observed during ebb than during flood tides, and PC1 at Zhijiang increased notably with increasing salinity. We conclude that anthropogenic inputs contributed primarily to the CDOM pool in the estuary and are mediated by the physical mixing of riverine freshwater and seawater, and ebb tides are often associated with enhanced anthropogenic CDOM with relatively high bioavailability.

KW - Chromophoric dissolved organic matter (CDOM)

KW - Parallel factor analysis (PARAFAC)

KW - Qiantang estuary

KW - Tidal oscillations

KW - Ultrahigh resolution mass spectrometry

UR - http://www.scopus.com/inward/record.url?scp=85060514207&partnerID=8YFLogxK

U2 - 10.1016/j.scitotenv.2019.01.220

DO - 10.1016/j.scitotenv.2019.01.220

M3 - Journal article

C2 - 30708292

SN - 0048-9697

VL - 662

SP - 769

EP - 778

JO - Science of the Total Environment

JF - Science of the Total Environment

ER -

Response of chromophoric dissolved organic matter dynamics to tidal oscillations and anthropogenic disturbances in a large subtropical estuary

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Keywords

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