DOI: 10.1029/2017JG004374
Scopus记录号: 2-s2.0-85052540119
论文题名: Relationships Between DOC and CDOM Based on the Total Carbon-Specific Fluorescence Intensities for River Waters Across China
作者: Zhao Y. ; Song K.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 8 起始页码: 2353
结束页码: 2361
语种: 英语
英文关键词: carbon-specific fluorescence
; CDOM
; DOC
; FDOM
; FRI
; river waters
英文摘要: Weak correlations between chromophoric dissolved organic matter (CDOM) absorption coefficient a(440) and dissolved organic carbon (DOC) were observed due to weak absorption for river waters especially in the Qinghai-Tibetan Plateau, and thus, it is impossible to estimate DOC concentrations by CDOM absorption across China. Therefore, it is necessary to estimate DOC concentrations through the fluorescent fraction of CDOM (i.e., FDOM). FDOM was proposed as a new method for estimation of large-scale DOC concentrations in river waters across China. A total of 301 water samples from eight river basins across China were selected to assess FDOM by excitation-emission matrix (EEM) fluorescence. Five fluorescent regions were obtained by EEM coupled with fluorescence regional integration (FRI) (EEM-FRI) method. However, weak correlations between the fluorescence intensities FR(1–5), FSUM, and DOC concentrations were observed for all water samples, respectively. Therefore, the total carbon-specific fluorescence intensities FSUM/DOC were used to establish relationships between DOC and FDOM. All 301 water samples excluding five outliers with FSUM/DOC higher than 8,000 nm/(mg/L)) were divided into four groups based on the threshold values for FSUM/DOC, and strong positive correlations between FSUM and DOC were observed in each group (R2 = 0.843, FSUM/DOC < 1,000 nm/(mg/L); R2 = 0.928, 1,000 < FSUM/DOC < 2,000 nm/(mg/L); R2 = 0.964, 2,000 < FSUM/DOC < 3,000 nm/(mg/L); and R2 = 0.953, 3,000 < FSUM/DOC < 8,000 nm/(mg/L)), respectively. This result indicated that the riverine DOC concentrations on large-scale across China can be estimated directly by FDOM properties. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113465
Appears in Collections: 气候减缓与适应
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作者单位: Northeast Institute of Geography and Agroecology, CAS, Changchun, China; Dalian Maritime University, Navigation College, Dalian, China
Recommended Citation:
Zhao Y.,Song K.. Relationships Between DOC and CDOM Based on the Total Carbon-Specific Fluorescence Intensities for River Waters Across China[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(8)