Absorption coefficient of yellow substance in the Pearl River estuary

Chen, Chuqun; Shi, Ping; Yin, Kedong; Pan, Zhilin; Zhan, Haigang; Hu, Chuanmin

doi:10.1117/12.466859

Cited by 16 publications

(6 citation statements)

References 12 publications

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“…Absorption coefficients for West Falmouth and Chincoteague were comparable to those reported for other estuaries and coastal waters (Chen et al, 2003;Green and Blough, 1994). Absorption coefficients for Barnegat Bay were somewhat higher, but within the range reported by Green and Blough (1994).…”

Section: Absorption Coefficient and Spectral Slope Rangessupporting

confidence: 78%

Colored dissolved organic matter in shallow estuaries: relationships between carbon sources and light attenuation

et al. 2016

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Light availability is of primary importance to the ecological function of shallow estuaries. For example, benthic primary production by submerged aquatic vegetation is contingent upon light penetration to the seabed. A major component that attenuates light in estuaries is colored dissolved organic matter (CDOM). CDOM is often measured via a proxy, fluorescing dissolved organic matter (fDOM), due to the ease of in situ fDOM sensor measurements. Fluorescence must be converted to CDOM absorbance for use in light attenuation calculations. However, this CDOM-fDOM relationship varies among and within estuaries. We quantified the variability in this relationship within three estuaries along the mid-Atlantic margin of the eastern United States: West Falmouth Harbor (MA), Barnegat Bay (NJ), and Chincoteague Bay (MD/VA). Land use surrounding these estuaries ranges from urban to developed, with varying sources of nutrients and organic matter. Measurements of fDOM (excitation and emission wavelengths of 365 nm (±5 nm) and 460 nm (±40 nm), respectively) and CDOM absorbance were taken along a terrestrial-to-marine gradient in all three estuaries. The ratio of the absorption coefficient at 340 nm (m −1 ) to fDOM (QSU) was higher in West Falmouth Harbor (1.22) than in Barnegat Bay (0.22) and Chincoteague Bay (0.17). The CDOM : fDOM absorption ratio was variable between sites within West Falmouth Harbor and Barnegat Bay, but consistent between sites within Chincoteague Bay. Stable carbon isotope analysis for constraining the source of dissolved organic matter (DOM) in West Falmouth Harbor and Barnegat Bay yielded δ 13 C values ranging from −19.7 to −26.1 ‰ and −20.8 to −26.7 ‰, respectively. Concentration and stable carbon isotope mixing models of DOC (dissolved

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Section: Absorption Coefficient and Spectral Slope Rangessupporting

confidence: 78%

Colored dissolved organic matter in shallow estuaries: relationships between carbon sources and light attenuation

et al. 2016

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“…The salinity field showed feature of coastal runoff in the Florida Bay and West Florida Shelf. Chen et al (2003a) found the CDOM decreases with increasing salinity following an apparent nonlinear mixing line in the PRE. We also analyze the relationships between salinity and CDOM absorption coefficients in the dry season and wet season and we find that the CDOM decreases and the CDOM spectral slope increases with the increase of salinity.…”

Section: Resultsmentioning

confidence: 95%

Temporal variability of chromophoric dissolved organic matter in the Pearl River Estuary, China from 2003 to 2009

Liu

Tang

Chen

2014

Aquatic Ecosystem Health &Amp; Management

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The present study aims to investigate the temporal variability of chromophoric dissolved organic matter through remote sensing and to determine its influence factors in the Pearl River Estuary. A medium resolution imaging spectrometer, chromophoric dissolved organic matter product was evaluated with in situ absorption coefficient (R2 = 0.9605, RMS = 0.1672 and MRE = 0.3930). L2 daily products were then averaged into monthly data to analyze variability in the specified area from January 2003 to December 2009. Accumulated anomaly analysis and the wavelet analysis showed that the variability had a significant period of one year from 2003 to 2009, accompanied with 3 and 6 month periods in 2004 and 2008 separately. Cross wavelet transform was used to analyze the relationships between chromophoric dissolved organic matter and its influence factors including rainfall and phytoplankton in time frequency space. Relationships with salinity and light were also analyzed. It was found that photobleaching induces lower dissolved organic matter in summer even though there is greater discharge due to large rainfall intensity during this season. However, the anomalous strong precipitation may cause significantly higher findings in the study area. An example was a heavy flood caused by strong precipitation in 2008 induced higher findings for the period for less than half a year.

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“…Lei et al, 2018) and many did not cover the upper reach of the estuary (e.g. Chen et al, 2003;Chen et al, 2004;Wang et al, 2014;Lei et al, 2018).…”

Section: Overview Of Dommentioning

confidence: 99%

Distribution, seasonality, optical characteristics, and fluxes of dissolved organic matter (DOM) in the Pearl River (Zhujiang) estuary, China

Song

Massicotte

et al. 2018

Preprint

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Abstract. Dissolved organic carbon concentration in the Pearl River estuary (PRE) of China was measured in May, August, and October 2015 and January 2016. Chromophoric and fluorescent dissolved organic matter (CDOM and FDOM) in the latter three seasons were characterized by absorption and fluorescence spectroscopy. Parallel factor analysis of the fluorescence spectra identified two protein-like, two humic-like, and one oxidized quinone-like FDOM components. The seasonality of average DOM abundance varied as follows: DOC: May (156&#8201;&#956;mol&#8201;L&#8722;1)&#8201;>&#8201;January (114&#8201;&#956;mol&#8201;L&#8722;1)&#8201;&#8776;&#8201;August (112&#8201;&#956;mol&#8201;L&#8722;1)&#8201;>&#8201;November (86&#8201;&#956;mol&#8201;L&#8722;1); CDOM absorption at 330&#8201;nm: August (1.76&#8201;m&#8722;1)&#8201;>&#8201;November (1.39&#8201;m&#8722;1)&#8201;&#8776;&#8201;January (1.30&#8201;m&#8722;1); FDOM expressed as the sum of the maximum fluorescence intensities of all FDOM components: November (1.77&#8201;R.U.)&#8201;>&#8201;August (1.54&#8201;R.U.)&#8201;&#8776;&#8201;January (1.49&#8201;R.U.). Average DOM abundance in surface water was higher than in bottom water, their difference being marginal (0.1&#8211;10&#8201;%) for DOC in all seasons and for CDOM and FDOM in November and January, and moderate (16&#8211;21&#8201;%) for CDOM and FDOM in August. DOC showed little cross-estuary variations in all seasons while CDOM and FDOM in January were higher on the west side of the estuary than in the middle and on the east side. All three variables exhibited large variations and/or rapid drawdowns at the head of the estuary (salinity&#8201;<&#8201;5) due to multiple freshwater endmembers and/or biotic losses. In the saltier zone, they declined linearly with salinity except relatively constant DOC in May and November. The decrease in FDOM was 5&#8211;35&#8201;% faster than that in CDOM, which in turn was 2&#8211;3 times faster than that in DOC. Salinity and CDOM absorption coefficients can serve as indicators of DOC in August and January. Absorbance- and fluorescence-based indices demonstrate that freshwater endmembers in all seasons mainly contained fresh, protein-rich DOM of microbial origin, though the proportion of humic-like components was somewhat higher in August. Protein-like materials were preferentially consumed in the low-salinity section but the dominance of the microbial signature was maintained throughout the saltier zone. Exports of DOC and CDOM (in terms of a330) into the South China Sea were estimated as 195&#8201;&#215;&#8201;109&#8201;g and 266&#8201;&#215;&#8201;109&#8201;m2 for the PRE, and 362&#8201;&#215;&#8201;109&#8201;g and 493&#8201;&#215;&#8201;109&#8201;m2 for the entire Pearl River Delta. Compared to other world major estuaries, the PRE presents the lowest concentrations and export fluxes of DOC and CDOM. Nonetheless, DOM delivered by the PRE is protein-rich and thus may significantly impact the local ecosystem.

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Absorption coefficient of yellow substance in the Pearl River estuary

Cited by 16 publications

References 12 publications

Colored dissolved organic matter in shallow estuaries: relationships between carbon sources and light attenuation

Colored dissolved organic matter in shallow estuaries: relationships between carbon sources and light attenuation

Temporal variability of chromophoric dissolved organic matter in the Pearl River Estuary, China from 2003 to 2009

Distribution, seasonality, optical characteristics, and fluxes of dissolved organic matter (DOM) in the Pearl River (Zhujiang) estuary, China

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