Response of dissolved organic matter optical properties to net inflow runoff in a large fluvial plain lake and the connecting channels

Yongqiang  Zhou; Xiaolong Yao; Yunlin Zhang; Yibo Zhang; Kun Shi; Xiangming  Tang; Boqiang Qin; David C.  Podgorski; Justin D. Brookes; Erik Jeppesen

doi:10.1016/j.scitotenv.2018.05.180

Response of dissolved organic matter optical properties to net inflow runoff in a large fluvial plain lake and the connecting channels

Yongqiang Zhou, Xiaolong Yao, Yunlin Zhang, Yibo Zhang, Kun Shi, Xiangming Tang, Boqiang Qin, David C. Podgorski, Justin D. Brookes, Erik Jeppesen

Arctic Research Centre - Arctic Research Center, ECOS Water

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

34 Citations (Scopus)

Abstract

Fluvial plain lake watersheds are usually highly urbanized and have high concentrations of chromophoric dissolved organic matter (CDOM). CDOM derived from the connecting urban channels usually share strong terrestrial and anthropogenic signals and net inflow runoff (Q _net) to the lake serves as a proxy of residential household sewage input. We investigate how Q _net controls the optical characteristics of CDOM in fluvial plain Lake Taihu and the connecting channels. CDOM absorption coefficient a(350), dissolved organic carbon (DOC), the fluorescence intensity (F _max) of seven PARAFAC components C1-C7, and δ ¹⁵N-TDN were higher in the northwestern relative to the other lake regions, and a(250)/a(365), spectral slope S _275–295, and δ ¹³C-DOM relative low in the northwestern lake, all indicating strong terrestrial and anthropogenic effects. Conversely, the urban land cover (%Cities), gross domestic product (GDP), and population density were relatively low in the western sub-watersheds and high in the eastern sub-watersheds. This apparent paradox reflects variations in Q _net from different sub-watersheds. Thus, significant positive relationships were found between Q _net and a(350), DOC, chemical oxygen demand (COD), chlorophyll-a (Chl-a), F _max of C1-C3 and C6-C7, and %C2-%C3 in the five hydraulic sub-watersheds. We revealed significant positive relationships between mean a(350), DOC, COD, Chl-a, C1-C3 and C6, %C2-%C3, and the products of Q _net × %Cities, Q _net × GDP, and Q _net × population density. We further found dominant contribution of lignin to the total number of assigned formulas for the samples collected from the channels in the Huxi watershed and the central lake using high resolution mass spectroscopy. We conclude that Q _net is of key importance for the optical properties of CDOM molecules in the various regions of Lake Taihu and the connecting channels.

Original language	English
Journal	Science of the Total Environment
Volume	639
Pages (from-to)	876–887
Number of pages	12
ISSN	0048-9697
DOIs	https://doi.org/10.1016/j.scitotenv.2018.05.180
Publication status	Published - 2018

Keywords

Chromophoric dissolved organic matter (CDOM)
Fluvial plain lake
Net inflow runoff (Q )
Parallel factor analysis (PARAFAC)

Access to Document

10.1016/j.scitotenv.2018.05.180

Cite this

@article{80d5f2e4777b47a885c3d2ccfb2766e5,

title = "Response of dissolved organic matter optical properties to net inflow runoff in a large fluvial plain lake and the connecting channels",

abstract = "Fluvial plain lake watersheds are usually highly urbanized and have high concentrations of chromophoric dissolved organic matter (CDOM). CDOM derived from the connecting urban channels usually share strong terrestrial and anthropogenic signals and net inflow runoff (Q net) to the lake serves as a proxy of residential household sewage input. We investigate how Q net controls the optical characteristics of CDOM in fluvial plain Lake Taihu and the connecting channels. CDOM absorption coefficient a(350), dissolved organic carbon (DOC), the fluorescence intensity (F max) of seven PARAFAC components C1-C7, and δ 15N-TDN were higher in the northwestern relative to the other lake regions, and a(250)/a(365), spectral slope S 275–295, and δ 13C-DOM relative low in the northwestern lake, all indicating strong terrestrial and anthropogenic effects. Conversely, the urban land cover (%Cities), gross domestic product (GDP), and population density were relatively low in the western sub-watersheds and high in the eastern sub-watersheds. This apparent paradox reflects variations in Q net from different sub-watersheds. Thus, significant positive relationships were found between Q net and a(350), DOC, chemical oxygen demand (COD), chlorophyll-a (Chl-a), F max of C1-C3 and C6-C7, and %C2-%C3 in the five hydraulic sub-watersheds. We revealed significant positive relationships between mean a(350), DOC, COD, Chl-a, C1-C3 and C6, %C2-%C3, and the products of Q net × %Cities, Q net × GDP, and Q net × population density. We further found dominant contribution of lignin to the total number of assigned formulas for the samples collected from the channels in the Huxi watershed and the central lake using high resolution mass spectroscopy. We conclude that Q net is of key importance for the optical properties of CDOM molecules in the various regions of Lake Taihu and the connecting channels.",

keywords = "Chromophoric dissolved organic matter (CDOM), Fluvial plain lake, Net inflow runoff (Q ), Parallel factor analysis (PARAFAC)",

author = "Yongqiang Zhou and Xiaolong Yao and Yunlin Zhang and Yibo Zhang and Kun Shi and Xiangming Tang and Boqiang Qin and Podgorski, {David C.} and Brookes, {Justin D.} and Erik Jeppesen",

year = "2018",

doi = "10.1016/j.scitotenv.2018.05.180",

language = "English",

volume = "639 ",

pages = "876–887",

journal = "Science of the Total Environment",

issn = "0048-9697",

publisher = "Elsevier B.V.",

}

Response of dissolved organic matter optical properties to net inflow runoff in a large fluvial plain lake and the connecting channels. / Zhou, Yongqiang ; Yao, Xiaolong; Zhang, Yunlin et al.
In: Science of the Total Environment, Vol. 639 , 2018, p. 876–887.

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

TY - JOUR

T1 - Response of dissolved organic matter optical properties to net inflow runoff in a large fluvial plain lake and the connecting channels

AU - Zhou, Yongqiang

AU - Yao, Xiaolong

AU - Zhang, Yunlin

AU - Zhang, Yibo

AU - Shi, Kun

AU - Tang, Xiangming

AU - Qin, Boqiang

AU - Podgorski, David C.

AU - Brookes, Justin D.

AU - Jeppesen, Erik

PY - 2018

Y1 - 2018

N2 - Fluvial plain lake watersheds are usually highly urbanized and have high concentrations of chromophoric dissolved organic matter (CDOM). CDOM derived from the connecting urban channels usually share strong terrestrial and anthropogenic signals and net inflow runoff (Q net) to the lake serves as a proxy of residential household sewage input. We investigate how Q net controls the optical characteristics of CDOM in fluvial plain Lake Taihu and the connecting channels. CDOM absorption coefficient a(350), dissolved organic carbon (DOC), the fluorescence intensity (F max) of seven PARAFAC components C1-C7, and δ 15N-TDN were higher in the northwestern relative to the other lake regions, and a(250)/a(365), spectral slope S 275–295, and δ 13C-DOM relative low in the northwestern lake, all indicating strong terrestrial and anthropogenic effects. Conversely, the urban land cover (%Cities), gross domestic product (GDP), and population density were relatively low in the western sub-watersheds and high in the eastern sub-watersheds. This apparent paradox reflects variations in Q net from different sub-watersheds. Thus, significant positive relationships were found between Q net and a(350), DOC, chemical oxygen demand (COD), chlorophyll-a (Chl-a), F max of C1-C3 and C6-C7, and %C2-%C3 in the five hydraulic sub-watersheds. We revealed significant positive relationships between mean a(350), DOC, COD, Chl-a, C1-C3 and C6, %C2-%C3, and the products of Q net × %Cities, Q net × GDP, and Q net × population density. We further found dominant contribution of lignin to the total number of assigned formulas for the samples collected from the channels in the Huxi watershed and the central lake using high resolution mass spectroscopy. We conclude that Q net is of key importance for the optical properties of CDOM molecules in the various regions of Lake Taihu and the connecting channels.

AB - Fluvial plain lake watersheds are usually highly urbanized and have high concentrations of chromophoric dissolved organic matter (CDOM). CDOM derived from the connecting urban channels usually share strong terrestrial and anthropogenic signals and net inflow runoff (Q net) to the lake serves as a proxy of residential household sewage input. We investigate how Q net controls the optical characteristics of CDOM in fluvial plain Lake Taihu and the connecting channels. CDOM absorption coefficient a(350), dissolved organic carbon (DOC), the fluorescence intensity (F max) of seven PARAFAC components C1-C7, and δ 15N-TDN were higher in the northwestern relative to the other lake regions, and a(250)/a(365), spectral slope S 275–295, and δ 13C-DOM relative low in the northwestern lake, all indicating strong terrestrial and anthropogenic effects. Conversely, the urban land cover (%Cities), gross domestic product (GDP), and population density were relatively low in the western sub-watersheds and high in the eastern sub-watersheds. This apparent paradox reflects variations in Q net from different sub-watersheds. Thus, significant positive relationships were found between Q net and a(350), DOC, chemical oxygen demand (COD), chlorophyll-a (Chl-a), F max of C1-C3 and C6-C7, and %C2-%C3 in the five hydraulic sub-watersheds. We revealed significant positive relationships between mean a(350), DOC, COD, Chl-a, C1-C3 and C6, %C2-%C3, and the products of Q net × %Cities, Q net × GDP, and Q net × population density. We further found dominant contribution of lignin to the total number of assigned formulas for the samples collected from the channels in the Huxi watershed and the central lake using high resolution mass spectroscopy. We conclude that Q net is of key importance for the optical properties of CDOM molecules in the various regions of Lake Taihu and the connecting channels.

KW - Chromophoric dissolved organic matter (CDOM)

KW - Fluvial plain lake

KW - Net inflow runoff (Q )

KW - Parallel factor analysis (PARAFAC)

UR - http://www.scopus.com/inward/record.url?scp=85047273845&partnerID=8YFLogxK

U2 - 10.1016/j.scitotenv.2018.05.180

DO - 10.1016/j.scitotenv.2018.05.180

M3 - Journal article

C2 - 29929326

SN - 0048-9697

VL - 639

SP - 876

EP - 887

JO - Science of the Total Environment

JF - Science of the Total Environment

ER -

Response of dissolved organic matter optical properties to net inflow runoff in a large fluvial plain lake and the connecting channels

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this