[PDF] Top 20 Chemodiversity of dissolved organic matter in the Amazon Basin

... the Amazon Basin have been asso- ciated with specific biogeochemical processes, but a de- tailed chemical classification of the abundant and ubiquitous dissolved organic matter (DOM), ... See full document

... the Amazon Basin have been asso- ciated with specific biogeochemical processes, but a de- tailed chemical classification of the abundant and ubiquitous dissolved organic matter (DOM), ... See full document

... DOM chemodiversity as it en- hances upward movement of ferrous ions and DOM mol- ecules from deep soils, and influences the influx of selective DOM from the surface ... See full document

... DOM chemodiversity as it en- hances upward movement of ferrous ions and DOM mol- ecules from deep soils, and influences the influx of selective DOM from the surface ... See full document

... 426 Previous research regarding linkages between DOM and BCC has only focused 427 on the effects of the content of soil carbon 12 , the appreciation of their relationships with 428 each other is strikingly limited on the ... See full document

... 4.1.2. DON and DOP [ 23 ] DON levels in the upper 250 m of the Cariaco Basin were similar to those measured in other marine settings [Carlson et al., 1994; Guo et al., 1994, 1995; Hansell et al., 1997; Hansell and ... See full document

... precursor material can help in establishment of effective monitoring programs. DOM sources and concentrations were evaluated in this study using optical analyses (absorbance and fluorescence) and biomarkers (lignin and ... See full document

... crenarchaeol (µg g −1 OC ) 7.8 ± 6.0 26.0 1.2 27 grasses/leaves) or wetland soils might explain the elevated S : V ratio of the SOM. Further information with respect to sources of SOM can be obtained from the GDGT ... See full document

... %BDOC recorded by Fellman et al. [19] in three watersheds in Alaska ranged between 7 and 38%. The present study demonstrated that DOC and BDOC concentrations varied depending on season. This was due to both accelerated ... See full document

... 457 nm) ranged from 0.5 to 3.1 Fl.U. (Figure 7) and showed a maximum between 40 and 200 m water depth (Figures 4 – 7). In transect C, the CDOM maximum was found on the shelf break, whereas in transects A and B in the ... See full document

... 3. Results 3.1. Seasonality of DOM, climate and hydrology DOM in the Malse River during 1969–2000 ˇ showed a distinct seasonal pattern with the lowest concentrations (COD ;4 mg l ) during winter y1 periods of freezing ... See full document

... Melling and Lewis, 1982] and interactions with bottom sediments on the shelves [Moore et al., 1983]. The lower halocline layer (lower HL) is found beneath the upper HL and mainly originates from the Atlantic. Mixtures ... See full document

... agree with the in situ fluorescence in Figure 2. Sea ice formation and DOM rejection on shelves is the most likely process explaining the differing estimates of the riverine contribution to freshwater in the Canada ... See full document

... River basin (n = 104), Lago Janauacá (a central Amazon floodplain lake, n = 17), the Niger River (n = 19) and the Okavango Delta (n = 17) were added to the dataset to increase the variability in DOM ... See full document

... study, organic acids with low pK a values would be expected to be primarily dissociated and therefore less available to protonate potential Lewis acid sites on the goethite sur- ... See full document

... Sedimentary organic matter is a possible source of the older component in the deep DOC. Bauer and Druffel (1998) found elevated DOC concentrations with a more 14 C-depleted, “older”, signature in the ... See full document

... represented by a single elemental formula in the FT-ICR mass spectra is probably not as high as expected for natural organic matter. 3.2 East Atlantic Ocean DOM degradation state The linear correlation ... See full document

... The organic frac- tion of this fl ux may be buried, remineralized or ultimately stored in the deep ...restrial organic carbon can pass through the coastal and estuarine filter, a process of unknown ... See full document

... 2012), and DOM in pore water from these soils is highly aromatic (Wickland et al. 2007). Further support for the contribution of DOM from a shallow flowpath during freshet comes from the greater proportion of Component 5 ... See full document

... In all cultures, humic-like and protein-like substances increased during the course of the incubations. Because bacteria were absent, it implies that the increases in DOC and FDOM were exclusively due to phytoplankton ... See full document