Distribution of dissolved organic matter in estuaries of the southern Iberian Atlantic Basin: Sources, behavior and export to the coastal zone

Abstract

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Distribution, spectral characteristics, and seasonal variation of dissolved organic matter in the northern Beibu Gulf, South China Sea

“…In region I, the conservative mixing behavior of bulk DOC, CDOM, and humic-like FDOM occurs over four seasons (Figures 8A-P), which may reflect the fewer changes in these variables along the estuaries. Similar behavior during estuarine mixing was reported in other estuarine and coastal systems (Jaffe et al, 2004;Guo et al, 2007;Guo et al, 2011;Li et al, 2019;Yang et al, 2019;Amaral et al, 2020). Such mixing patterns indicate that the physical mixing of fresh river water and coastal water dominates the distributions of DOC, CDOM, and humic-like FDOM in estuaries and coastal ecosystems.…”

Contrasting Estuarine Processing of Dissolved Organic Matter Derived From Natural and Human‐Impacted Landscapes

“…It is known that DOC concentration can differ between depths, with higher concentrations in bottom layers as a result of resuspension of DOC from the sediments (Cauwet & Mackenzie, 1993). Furthermore, results from studies in tropical and temperate estuaries have shown semidiurnal variability in DOC and fluorescence DOM related to tides (Amaral et al., 2020; Regnier et al., 2013). High frequency DOC and online fluorescence DOM monitoring would provide further information on the transport and cycling of DOC in estuaries, but costs will be excessively high for a large‐scale geographical study such as this (Croghan et al., 2021; Khamis et al., 2020).…”

Physiological and transcriptomic responses of Chlorella sorokiniana to ciprofloxacin reveal molecular mechanisms for antibiotic removal

“…Three components of DOM were identified based on the PARAFAC model using OpenFluor database, as described in Figure 3 . Component C1 (emission maximum 419 nm with 330 and 265 nm excitation maxima) was considered to be a fulvic acid-type component, which is reported as a ubiquitous matter found in almost all environments ( Amaral et al., 2020 ; Yamashita et al., 2011 ). Another humic-like component C3 had an emission maximum at 478 nm and two excitation maxima (260 and 355–365 nm), possibly corresponding to the microbial humic-like components on the basis of the results of Yamashita et al.…”