Dissolved organic carbon in summer precipitation and its wet deposition flux in the Mt. Yulong region, southeastern Tibetan Plateau

Niu, Hewen; Kang, Shichang; Shi, Xiaofei; Zhang, Guotao; Wang, Shijin; Pu, Tao

doi:10.1007/s10874-019-9385-8

Cited by 26 publications

(14 citation statements)

References 83 publications

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“…Results suggest that organic acids contributed a relatively small percentage to the acidity in the Zagreb precipitation [15]. The air mass sources and rainfall amount can affect rainwater DOC concentrations [18,20]. At our location, a weak and significant negative correlation (r = −0.39: p < 0.05) between concentrations of DOC and rainfall amount was found, similar to what has been observed in our previous study [22].…”

Section: Organic Carbonsupporting

confidence: 89%

“…According to Kieber et al [15], this result may reflect the possibility that some components of DOC are formed in the atmospheric aqueous phase continuously during rain events. However, this lack of correlation also may be due to the photolysis of DOC [20] No significant correlation (p > 0.05) was observed between DOC concentrations and pH values (Table S2 in Supplementary Materials). Results suggest that organic acids contributed a relatively small percentage to the acidity in the Zagreb precipitation [15].…”

Section: Organic Carbonmentioning

confidence: 98%

“…The DOC content found in this study was much lower than the concentrations reported for other urban and polluted areas [17][18][19]56]. For example, in the industrialized and urbanized region of Poznań (Poland), the average DOC concentration (5.10 mgC L −1 ) was about three times higher than values in Zagreb [17]; in Mexico City DOC (up to 19.5 mgC L −1 ) is five times higher [19], while in the southeastern Tibetan Plateau, DOC ranges from 0.74 to 1.31 mgC L −1 [20]. This difference can be partly attributed to the various origins of DOC in precipitation.…”

Section: Organic Carbonmentioning

confidence: 99%

“…This process is crucial for the evaluation of the global carbon cycle [5,15]. The climate change in recent decades has led to increased interest in the study of DOC in atmospheric precipitation [16][17][18][19][20] and surface waters [14] (and references therein).Surface-active substances (SAS) make up a portion of rainwater DOC [21-23] (and references therein) and the water-soluble organic carbon (WSOC) fraction of atmospheric aerosols [24] (and references therein). These compounds are the most reactive part of DOC [25] because they tend to adsorb on the natural phase boundaries (air-water, water-sediment/suspended particles) and, in this way, significantly affect the transfer of mass and energy.…”

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confidence: 99%

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confidence: 99%

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Physico-Chemical Characterization of an Urban Rainwater (Zagreb, Croatia)

et al. 2020

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The characterization of organic matter (OM) and trace elements (TEs) was conducted in bulk precipitation samples collected in an urban area of Croatia (Zagreb center), from January 2009 to October 2011 (N = 31). Characterization of OM was performed by measurement of dissolved (DOC) and particulate forms of organic carbon (POC), as well as surface-active substances, copper complexing capacity and reduced sulfur species which were determined electrochemically. Concentrations of TEs (Al, Fe, Zn, Cr, Ba, Mn, Cu, Sr, Ti, Pb, V, Ni, Rb, Sb, As, Sn, Se, Co, Cd, Mo) were analyzed by HR ICP-MS. The most important outcome of this study is confirmed relatively low concentrations of DOC (0.69–4.86 mgC L−1) and TEs. Daily fluxes of Zn, Pb, Ni, As, and Cd were two to three times lower than that of those reported for an urban industrial site in Europe. Additionally, this study shows that the value and reactivity of rainwater DOC has not considerably changed if compared with the results from the 1998–1999 study (0.78–4.39 mgC L−1). High traffic density and thermal power plants are assumed to be the main local sources of pollutants in Zagreb. Using Al as a reference element, it was found that Cd, Sb, and Cu were associated with anthropogenic sources. The solubility of Sr, Zn, Cd, Ni, Cr, As, and Rb was higher than 70%. Another critical characteristic of precipitation composition is episodic variation in POC concentration because of Saharan dust transport. Obtained data can be valuable for environmental quality assessment, as well as for insight into atmospheric deposition processes.

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Section: Organic Carbonsupporting

confidence: 89%

Section: Organic Carbonmentioning

confidence: 98%

Section: Organic Carbonmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Physico-Chemical Characterization of an Urban Rainwater (Zagreb, Croatia)

et al. 2020

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Dissolved organic carbon transport in the Qilian mountainous areas of China

Zhu

Wan

Yong

et al. 2020

Hydrological Processes

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The Dissolved Organic Carbon (DOC) content of rivers is the most significant part of the carbon cycle migration in the basin under consideration, and it is the basis for a comprehensive understanding of the regional carbon cycle. In this study, we periodically collected samples from four monitoring stations in the Xiying River Basin of the Qilian Mountains in the northern Qinghai-Tibet Plateau. We calculated the fluxes of organic carbon in the rivers within the study area and have discussed the influencing factors of DOC concentration in these rivers. The results showed that: (a) The DOC concentration and transport flux of the Xiying river showed significant seasonal changes. The DOC concentration during summer and autumn was higher than that in winter and spring, and the output flux in summer and autumn accounted for approximately 88.3% of the total annual output. (b) Precipitation runoff has a higher DOC concentration than meltwater runoff. Climate factors, river-water chemical characteristics, and seasonal frozen-soil changes in the river basin have significant effects on the river DOC concentration and transport flux. (c) Larger runoff causes higher DOC concentrations in rivers. Runoff is the primary means of carbon migration in the inland river basin. Carbon migration is significant from the upstream to the middle and downstream sections of the inland river basin.

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