Distinct Non-conservative Behavior of Dissolved Organic Matter after Mixing Solimões/Negro and Amazon/Tapajós River Waters.

In both ESI[−] and ESI[+] MS-based PCA ( Figure 4 ), PC1 showed a clear trend: Amazon < Tapajós < 1d-incubated A + T < 5d-incubated A + T, due to increased abundance in compounds with a lower O/C ratio, a lower m / z , and a modified aromaticity index (AI mod ) 37 less than 0.5.

also in 7,418 other papers

82 Pronounced changes in DOM composition during incubation suggest substantial diagenetic modification of organic matter, even if the complete mineralization of DOM may not be significant. 83 , 84 Nevertheless, continuous oxidation of the residual DOM molecules is likely to generate oxygen-rich CO 2 and H 2 O molecules in the river confluence and subsequent river channels, contributing to a nominal reduction of leftover DOM molecules even in the case of oxidative processing. 84 Rivers provide a direct link between terrestrial and marine carbon cycles.

also in 1,077 other papers