Occurrence, sources and seasonal variation of PM2.5 carbonaceous aerosols in a water level fluctuation zone in the Three Gorges Reservoir, China

Wang, Xi; Wang, Fengwen; Feng, Tian; Zhang, Siyuan; Guo, Zhigang; Lu, Peili; Liu, Li; Yang, Fumo; Liu, Jiaxin

doi:10.1016/j.apr.2020.04.014

Cited by 8 publications

(1 citation statement)

References 66 publications

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“…Thus, the cooling effect of water impoundment within this distance range can be justified by evaporative cooling theory. Xiangjiaba and Xiluodu hydropower plants are characterized by high water leve operation during the dry season, and low water level operation during the wet season [50]. This suggests the water area and volume of reservoirs are higher in the dry season than in the wet season.…”

Section: Impacts Of Reservoir Impoundment On Air Temperaturementioning

confidence: 99%

Quantifying Water Impoundment-Driven Air Temperature Changes in the Dammed Jinsha River, Southwest China

Li,

Zhou,

Huang

et al. 2023

Remote Sensing

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A number of previous studies have contributed to a better understanding of the thermal impacts of dam-related reservoirs on stream temperature, but very few studies have focused on air temperature, especially at the catchment scale. In addition, due to the lack of quantitative analysis, the identification of the effects of water impoundment on regional air temperature is still lacking. We investigated the impacts of reservoirs on the regional air temperature changes before and after two large dam constructions in the lower Jinsha River located in southwest China, by using a 40 year record of reanalysis data at 90 m resolutions. Furthermore, the long short-term memory (LSTM) model was also employed to construct an impoundment effect on the temperature (IET) index. Research results indicate that compared to the pre-impoundment period (1980–2012), the variations in the air temperature at the catchment scale were reduced during the post-impoundment period (2013–2019). The annual maximum air temperature decreased by 0.4 °C relative to the natural regimes. In contrast, the cumulative effects of dam-related reservoirs increased the annual mean and minimum air temperature by 0.1 °C and 1.0 °C, respectively. Warming effects prevailed during the dry season and in the regions with high elevations, while cooling effects dominated within a 4 km buffer of the reservoirs. Therefore, this study offers important insights about the impacts of anthropogenic impoundments on air temperature changes, which could be useful for policymakers to have a more informed and profound understanding of local climate changes in dammed areas.

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Section: Impacts Of Reservoir Impoundment On Air Temperaturementioning

confidence: 99%

Quantifying Water Impoundment-Driven Air Temperature Changes in the Dammed Jinsha River, Southwest China

Li,

Zhou,

Huang

et al. 2023

Remote Sensing

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Assessment of the exposure to PM2.5 in different Lebanese microenvironments at different temporal scales

Faour

Abboud

Germanos

et al. 2022

Environ Monit Assess

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The weak potential of using the sole outdoor concentrations to represent personal exposure to PM 2.5 is confirmed by the literature; therefore, it is important to account for a person’s movements over time when estimating the short-term personal air pollution exposure within different microenvironments (MEs). This study is an example of applying an assessment method of the exposure to PM 2.5 in different microenvironments at different temporal scales. A low-cost particle counter (the Dylos 1700) was used; its performance was validated in comparison with equivalent instruments such the SidePak AM520 Personal Aerosol Monitor (R 2 = 0.89). This validation also provided a function to convert measured particle number concentrations (PNCs) into calculated particle mass concentrations. The 150 profiles that was collected on a minute-by-minute basis regarding PM 2.5 concentration from December 2018 to May 2021 highlight the influence of individual activities and contextual factors on the air quality, so that Lebanon’s annual PM 2.5 mean (24.2 µg⁄m 3 ) is 142% higher than the World Health Organization (WHO) annual mean guideline (10 µg⁄m 3 ). Winter is the most polluted period due to the increased application of space heating devices. Additionally, the occurrence of dusty winds during the spring period leads to the elevated levels of dispersed PM 2.5 . Simultaneously, the rural zones are more polluted than urban ones due to the usage of more traditional heating equipment, in addition to the usage of chemical products like pesticides and fertilizers in agricultural activities in such areas. Furthermore, the (outdoor–indoor–transport) MEs indicate that the transport and indoor MEs have similar levels of suspended fine particulates, while outdoor MEs are less polluted. Studies based on the personal exposure to PM 2.5 were generally applied on specific and limited places such as schools, workplaces, or residences. The study aims to shed light on the modern method in an attempt to estimate the personal exposure to PM 2.5 and to inspire similar studies to achieve the maximum efficiency. Supplementary Information The online version contains supplementary material available at 10.1007/s10661-022-10607-6.

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Assessment of carbonaceous fractions in ambient aerosols at high altitude and lowland urban locations of Kumaon Province, Indian Himalaya

Kumar

Singh

Kumar³

et al. 2021

SN Appl. Sci.

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The present study investigates the characteristics of carbonaceous species like organic carbon (OC) and elemental carbon (EC) in ambient total suspended particulates (TSP) at Bhimtal (high altitude urban, 1413 m asl) and Pantnagar (lowland urban, 224 m asl) sites of Kumaon province in Uttarakhand, Indian Himalayan region during winter and summer 2017–2018. Ambient TSP samples were taken on quartz filters with high volume sampler followed by OC and EC quantification using IMPROVE_thermal optical reflectance protocol. Results showed that distinct seasonal differences in carbonaceous species levels were observed at both sites, while day- and night-time concentrations did not show notable variations. Further, total carbonaceous aerosols (TCA) at Pantnagar were approximately 3.0 and 1.3 times higher than Bhimtal for winter and summer, respectively, where estimated TCA accounted for ~ 30% to total TSP at both sites. Among quantified eight carbon fractions, OC2 and OC3 at Bhimtal while EC1 and EC2 at Pantnagar were the most abundant components. The char-EC and soot-EC concentrations showed a similar seasonal pattern where char contributed significantly as 89–90% to total EC at both sites. The observed OC/EC ratios suggested the formation of secondary organic carbon and char-EC/soot-EC ratios implied biomass burning as major sources for carbonaceous aerosols. Pearson correlation analysis indicated that char-EC showed significant higher correlations with OC and EC than soot-EC which infers different formation mechanisms of char and soot. Most of the carbonaceous parameters exhibited contrasting positive and negative correlations with the boundary layer height, temperature, and solar radiation at Bhimtal and Pantnagar, respectively.

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Occurrence, sources and seasonal variation of PM2.5 carbonaceous aerosols in a water level fluctuation zone in the Three Gorges Reservoir, China

Cited by 8 publications

References 66 publications

Quantifying Water Impoundment-Driven Air Temperature Changes in the Dammed Jinsha River, Southwest China

Quantifying Water Impoundment-Driven Air Temperature Changes in the Dammed Jinsha River, Southwest China

Assessment of the exposure to PM2.5 in different Lebanese microenvironments at different temporal scales

Assessment of carbonaceous fractions in ambient aerosols at high altitude and lowland urban locations of Kumaon Province, Indian Himalaya

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