Absorption and fluorescence characteristics of rainwater CDOM and contribution to Lake Taihu, China

Zhang, Yunlin; Gao, Guang; Shi, Kun; Niu, Cheng; Zhou, Yongqiang; Qin, Boqiang; Liu, Xiaohan

doi:10.1016/j.atmosenv.2014.09.038

Cited by 58 publications

(25 citation statements)

References 47 publications

(115 reference statements)

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“…8). The C peak is thought to reflect scavenging, both within and below the clouds, of aerosols from anthropogenic, biomass burning, marine and secondary organic sources (Muller et al 2008;Zhang et al 2014). However, the absorption data suggests a markedly low molecular weight and aromaticity, as previously noted by Graber and Rudich (2006).…”

Section: Rainfallmentioning

confidence: 69%

“…Previous fluorescence studies of rain DOC composition indicate the ubiquitous presence and common dominance of tryptophan-like fluorescence (Muller et al 2008;Salve et al 2012;Santos et al 2012;Zhang et al 2014). 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).…”

Section: Rainfallmentioning

confidence: 99%

“…Tryptophan-like material is not reported to be influenced by climatic factors (Muller et al 2008), however, the humic-like material can reflect the source and type of rainfall event which therefore affects the relative magnitude of C and T peaks (Cottrell et al 2013;Zhang et al 2014). Muller et al (2008) noted that high content of humic material is associated with tropical continental convective storms and localised thunderstorms, such as those which contribute most of the rainfall on North Andros.…”

Section: Rainfallmentioning

confidence: 99%

“…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%

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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: 69%

Section: Rainfallmentioning

confidence: 99%

Section: Rainfallmentioning

confidence: 99%

Section: Rainfallmentioning

confidence: 99%

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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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“…Data fit to γ-distribution ingest small particles and excrete them into the sediment, thus increasing the proportion of FPOM in the system (Figueiredo-Barros et al, 2009;Zhang et al, 2014). These worms TA B L E 2 Generalised linear mixed model, comparing the effects of litter N:P ratio (natural versus high) and shifts in rainfall (current versus + 40%) on decomposition process.…”

Section: Source Of Variationmentioning

confidence: 99%

Changes in rainfall level and litter stoichiometry affect aquatic community and ecosystem processes in bromeliad phytotelmata

et al. 2019

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Both N deposition and changes in precipitation amount are important components of global change and affect aquatic ecosystem functioning by altering the detrital quality and detrital processing rates by macroinvertebrates and microorganisms. Changes in precipitation pattern can also modify the physical structure of the ecosystem, determining habitat availability for aquatic organisms. Although these drivers can individually affect ecosystem structure and functioning, their interactive effects are poorly understood. To better understand the combined effects of detritus quality and precipitation regime on the structure and function of aquatic ecosystems we manipulated litter quality, by modifying N:P stoichiometry and rainfall amount on tropical natural aquatic microcosms (water‐holding epiphytic bromeliads). We performed an orthogonal manipulation of litter N:P ratio (natural N:P and high N:P) and rainfall levels (current level and predicted 40% increase for south‐eastern Brazil) Changes in litter quality affected the abundance of the aquatic organisms inhabiting bromeliads, including algae and bacteria. However, changes in litter quality combined with changes in precipitation levels affected only one group of macroinvertebrates, the Naididae worms (Oligochaeta) an important group of detritivores in the bromeliad systems. These combined drivers also affected the decomposition of organic matter by changing coloured organic matter concentrations, fine particulate matter biomass, and NH4+ concentrations in bromeliad tanks. The NH4+ concentration in bromeliad water was positively related with Naididae abundance, suggesting that these worms can act as ecosystem engineers by boosting N cycling. In both N:P treatments we observed a 50% decrease in N flux from litter to bromeliad leaves due to increases in nutrient leaching from the tanks caused by rainfall. The combined effects of litter quality and changes in precipitation regimes altered the decomposition process and nutrient cycling in tank bromeliads, probably through changes in the abundance of some keystone species (e.g. Naididae). Aquatic macroinvertebrate community structure remained similar after manipulating precipitation, despite changes in the abundance of some species. Although some microorganisms were washed out of the system, their abundance inside the bromeliads remained stable. We conclude that the abundance of individuals belonging to aquatic communities in bromeliad phytotelmata are generally stable and resistant to changes in rainfall levels, but are sensitive to changes in litter quality. This experiment showed that the interactive effects of increased precipitation and N concentrations differed from the effects of either factor alone. As responses to changes in these factors were complex rather than additive, caution is required in predicting the outcomes of changes in both factors in freshwater ecosystems.

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Spatial and temporal variability in water transparency in Yunnan Plateau lakes, China

et al. 2019

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Absorption and fluorescence characteristics of rainwater CDOM and contribution to Lake Taihu, China

Cited by 58 publications

References 47 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

Changes in rainfall level and litter stoichiometry affect aquatic community and ecosystem processes in bromeliad phytotelmata

Spatial and temporal variability in water transparency in Yunnan Plateau lakes, China

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