The relative and joint effect of rivers and urban area on a squall line in the Central Amazonia

Sátyro, Zayra Christine; Farias, Carla; Cândido, Luiz Antônio; Veiga, José Augusto Paixão

doi:10.1016/j.scitotenv.2020.142178

Cited by 4 publications

(1 citation statement)

References 57 publications

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“…Using gates, dams, pumping stations, and other projects, natural rivers are connected in series to each other to form river‐type urban landscape (RTUL) lakes. The construction of RTUL lakes greatly increases the urban water surface area, accumulates a large number of water resources, and improves the local ecological landscape of the city (Zayra et al, 2020; Nel et al, 2018). However, as the urban water system is substantially affected by anthropogenic factors, the water quantity and level are not only affected by nature but also closely related to human regulation.…”

Section: Introductionmentioning

confidence: 99%

Analyzing factors driving of eutrophication of river‐type urban landscape lakes

Jia

Dou

Bi³

et al. 2023

Water Environment Research

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The eutrophication of river-type urban landscape (RTUL) lakes is different from that of natural lakes. In this study, Xiaofu Lake, a typical RTUL lake with high anthropogenic interference, was used as the study area. Monitoring data from 2018 to 2020 were used to analyze the temporal and spatial distribution characteristics of chlorophyll a (Chl-a) concentrations with meteorological, hydrodynamic, and nutrient factors. Correlation and regression analyses were used to identify the relationship between the factors influencing eutrophication and the Chl-a. The MIKE21 model is used to simulate changes in water quality indicators. The study determined the relationship between river water quality and environmental factors and explored the causes of eutrophication in the water bodies of Xiaofu Lake. The results showed that from 2018 to 2020, the water quality showed seasonal variation and differences in spatial distribution. Except for total nitrogen, which remained at a high level (average 8.23 mg/L), other water qualities remained between classes II and IV. The proportions of mild, moderate, and severe eutrophication in the study area were 25%, 69%, and 6%, respectively. Indicators that were highly correlated with water eutrophication were turbidity, water temperature, total phosphorus, and permanganate index. The contribution of water temperature, ammonia nitrogen, and permanganate index to eutrophication was 30.5%, 22.6%, and 20.9%, respectively. The high proportion of sewage in the source of recharge water is one of the reasons for the deterioration of water quality. In addition, the change in water eutrophication was closely related to the gate operation in the region. Practitioner Points• There are differences between river-type urban landscape (RTUL) lakes and natural lakes, and the conditions that cause eutrophication are different.• RTUL are subject to strong human interference and rely on water transfer and gate scheduling to maintain water quantity.

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Section: Introductionmentioning

confidence: 99%

Analyzing factors driving of eutrophication of river‐type urban landscape lakes

Jia

Dou

Bi³

et al. 2023

Water Environment Research

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Urban sprawl can inhibit convection and decrease rainfall over an Amazonian city during a squall line type phenomenon

Sátyro¹,

Farias²,

Cândido³

et al. 2021

Urban Climate

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Aerosols from anthropogenic and biogenic sources and their interactions – modeling aerosol formation, optical properties, and impacts over the central Amazon basin

Nascimento

Béla

Meller³

et al. 2021

Atmos. Chem. Phys.

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Abstract. The Green Ocean Amazon experiment – GoAmazon 2014–2015 – explored the interactions between natural biogenic forest emissions from central Amazonia and urban air pollution from Manaus. Previous GoAmazon 2014–2015 studies showed that nitrogen oxide (NOx = NO + NO2) and sulfur oxide (SOx) emissions from Manaus strongly interact with biogenic volatile organic compounds (BVOCs), affecting secondary organic aerosol (SOA) formation. In previous studies, ground-based and aircraft measurements provided evidence of SOA formation and strong changes in aerosol composition and properties. Aerosol optical properties also evolve, and their impacts on the Amazonian ecosystem can be significant. As particles age, some processes, such as SOA production, black carbon (BC) deposition, particle growth and the BC lensing effect change the aerosol optical properties, affecting the solar radiation flux at the surface. This study analyzes data and models SOA formation using the Weather Research and Forecasting with Chemistry (WRF-Chem) model to assess the spatial variability in aerosol optical properties as the Manaus plumes interact with the natural atmosphere. The following aerosol optical properties are investigated: single scattering albedo (SSA), asymmetry parameter (gaer), absorption Ångström exponent (AAE) and scattering Ångström exponent (SAE). These simulations were validated using ground-based measurements at three experimental sites, namely the Amazon Tall Tower Observatory – ATTO (T0a), downtown Manaus (T1), Tiwa Hotel (T2) and Manacapuru (T3), as well as the U.S. Department of Energy (DOE) Gulfstream 1 (G-1) aircraft flights. WRF-Chem simulations were performed over 7 d during March 2014. Results show a mean biogenic SOA (BSOA) mass enrichment of 512 % at the T1 site, 450 % in regions downwind of Manaus, such as the T3 site, and 850 % in areas north of the T3 site in simulations with anthropogenic emissions. The SOA formation is rather fast, with about 80 % of the SOA mass produced in 3–4 h. Comparing the plume from simulations with and without anthropogenic emissions, SSA shows a downwind reduction of approximately 10 %, 11 % and 6 % at the T1, T2 and T3 sites, respectively. Other regions, such as those further downwind of the T3 site, are also affected. The gaer values increased from 0.62 to 0.74 at the T1 site and from 0.67 to 0.72 at the T3 site when anthropogenic emissions are active. During the Manaus plume-aging process, a plume tracking analysis shows an increase in SSA from 0.91 close to Manaus to 0.98 160 km downwind of Manaus as a result of SOA production and BC deposition.

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The relative and joint effect of rivers and urban area on a squall line in the Central Amazonia

Cited by 4 publications

References 57 publications

Analyzing factors driving of eutrophication of river‐type urban landscape lakes

Analyzing factors driving of eutrophication of river‐type urban landscape lakes

Urban sprawl can inhibit convection and decrease rainfall over an Amazonian city during a squall line type phenomenon

Aerosols from anthropogenic and biogenic sources and their interactions – modeling aerosol formation, optical properties, and impacts over the central Amazon basin

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