Fluorescent matter in the eastern Atlantic Ocean. Part 2: vertical profiles and relation to water masses

Determann, S.; Reuter, R.; Willkomm, R.

doi:10.1016/0967-0637(96)00008-8

Cited by 66 publications

(29 citation statements)

References 19 publications

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“…As with the humic substances, tryptophanlike material is thought to be incorporated during cloud formation due to the presence of proteinaceous and biogenic matter in cloud waters (Muller et al 2008). Atmospheric sources include bacteria, yeast, (Milne and Zika 1993;Determann et al 1996;Muller et al 2008). The presence of tryptophan-like material, along with relatively high BIX values (\0.8), has previously been used to infer a significant microbial-origin for atmospheric components within the rainfall (Salve et al 2012;Zhang et al 2014).…”

Section: Rainfallmentioning

confidence: 99%

Dissolved organic carbon transformations and microbial community response to variations in recharge waters in a shallow carbonate aquifer

et al. 2016

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In carbonate aquifers, dissolved organic carbon from the surface drives heterotrophic metabolism, generating CO 2 in the subsurface. Although this has been a proposed mechanism for enhanced dissolution at the water table, respiration rates and their controlling factors have not been widely evaluated. This study investigates the composition and concentration of dissolved organic carbon (DOC) reaching the water table from different recharge pathways on a subtropical carbonate island using a combination of DOC concentration measurements, fluorescence and absorption characterisation. In addition, direct measurements of the microbial response to the differing water types were made. Interactions of rainfall with the vegetation, via throughfall and stemflow, increase the concentration of DOC. The highest DOC concentrations are associated with stemflow, overland recharge and dissolution hole waters which interact with bark lignin and exhibit strong terrestrial-derived characteristics. The groundwater samples exhibit the lowest concentrations of DOC and are comprised of refractory humic-like organic matter. The heterotrophic response seems to be controlled by the concentration of DOC in the sample. The terrestrially sourced humic-like matter in the stemflow and dissolution hole samples was highly labile, thus increasing the amount of biologically produced CO 2 to drive dissolution. Based on the calculated respiration rates, microbial activity could enhance carbonate dissolution, increasing porosity generation by a maximum of 1 % kyr -1 at the top of the freshwater lens.

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Section: Rainfallmentioning

confidence: 99%

Dissolved organic carbon transformations and microbial community response to variations in recharge waters in a shallow carbonate aquifer

et al. 2016

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“…In the open ocean, meanwhile, relatively limited measurements of the fluorescence intensity of humic substances have been carried out so far. Although vertical profiles [Chen and Bada, 1992;Mopper and Schultz, 1993;Hayase and Shinozuka, 1995;Yamashita et al, 2007] and spatial variation [Chen and Bada, 1992;Determann et al, 1996;Yamashita and Tanoue, 2008] have been determined, the observations are rather fragmentary and little systematic study has been conducted to date covering spatial and temporal changes in the fluorescence intensity.…”

Section: Introductionmentioning

confidence: 99%

Relationship between the seasonal change in fluorescent dissolved organic matter and mixed layer depth in the subtropical western North Pacific

Omori

Hama

Ishii³

et al. 2010

J. Geophys. Res.

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[1] Spatial and temporal distributions of marine humic-like fluorescent dissolved organic matter (FDOM M ) were determined in the subtropical western North Pacific to evaluate the controlling factors of FDOM M behaviors. The observations were conducted at 4 stations (15-30°N) along 137°E in a subtropical area between January 2006 and April 2007. The florescence intensity of FDOM M was low (0.14-0.25 quinine sulfate units (QSU)) in the surface layer probably due to photodegradation, and increased with depth (0.90-1.10 QSU at 1000 m), irrespective of season and station. In the surface layer, the thickness of the water mass with low fluorescence intensity (<0.3 QSU) showed the seasonal change by being deeper in winter and shallower in summer, depending on the mixed layer depth (MLD). The average fluorescence intensity within the mixed layer also varied seasonally at midlatitudes; the intensity in summer was 40.8-53.8% of that in winter. Since the MLD was very much shallower in summer than in winter, FDOM M in the mixed layer would be kept within a shallow depth during the summer where intensive photodegradation could occur. The concentration of total organic carbon (TOC) was at its maximum at the water surface and decreased with depth, being adverse to FDOM M . Thus, the ratio of fluorescence intensity to TOC concentration was lowest (0.002-0.003) in surface water, which implies that FDOM M is not quantitatively important to the dissolved organic carbon pool. However, considering the possible difference in the stabilities of FDOM M against photochemical and microbial degradation, it is conceivable that photobleached FDOM M is one of the important organic groups constituting marine dissolved organic matter.Citation: Omori, Y., T. Hama, M. Ishii, and S. Saito (2010), Relationship between the seasonal change in fluorescent dissolved organic matter and mixed layer depth in the subtropical western North Pacific,

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“…Coble et al (1990) were pioneers in the use of excitation/emission matrices (EEMs) to study DOM fluorescence. EEMs helped to allocate the 2 main fluorophores of natural DOM: (1) the humiclike fluorophores, which have been studied since the 1960s, and (2) the protein-like fluorophores, which are due to aromatic amino acids (Mopper & Schultz 1993, Determann et al 1996, 1998, Coble et al 1998.…”

Section: Introductionmentioning

confidence: 99%

DOM fluorescence, a tracer for biogeochemical processes in a coastal upwelling system (NW Iberian Peninsula)

Nieto‐Cid¹,

Álvarez‐Salgado²,

Gago³

et al. 2005

Mar. Ecol. Prog. Ser.

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Fluorescent matter in the eastern Atlantic Ocean. Part 2: vertical profiles and relation to water masses

Cited by 66 publications

References 19 publications

Dissolved organic carbon transformations and microbial community response to variations in recharge waters in a shallow carbonate aquifer

Dissolved organic carbon transformations and microbial community response to variations in recharge waters in a shallow carbonate aquifer

Relationship between the seasonal change in fluorescent dissolved organic matter and mixed layer depth in the subtropical western North Pacific

DOM fluorescence, a tracer for biogeochemical processes in a coastal upwelling system (NW Iberian Peninsula)

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