Physicochemical factors and their potential sources inferred from long-term rainfall measurements at an urban and a remote rural site in tropical areas

Khan, Firoz; Maulud, Khairul Nizam Abdul; Latif, Mohd Talib; Chung, Jing Xiang; Amil, Norhaniza; Alias, Azwani; Nadzir, Mohd Shahrul Mohd; Sahani, Maneesh; Mohammad, Maznorizan; Jahaya, Mohd Firdaus; Hassan, Hanashriah; Jeba, Farah; Tahir, Norhayati Md; Abdullah, Sharifah Mastura Syed

doi:10.1016/j.scitotenv.2017.08.025

Cited by 31 publications

(18 citation statements)

References 69 publications

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“…for multiple user-driven applications. For example, some dissolved components are markers of soil erosion while in tropical areas (e.g., Khan et al 2018); inorganic particulate matter concentration can be used as an indicator of regional (deforestation) and global (climate) changes (e.g., Lal 2003); particulate matter and CDOM may be used as tracers of nutrients or pollutants (e.g., Ylöstalo et al 2016); CDOM might play a significant role in the global carbon cycle (e.g., Tranvik et al 2009). Hyperspectral measurements are particularly relevant to assess phytoplankton pigments that provide information for assessing the trophic status, evaluating the ecosystem's functioning and for distinguishing (potentially toxic) harmful algal blooms.…”

Section: Water Quality Monitoring and Assessment Of Biophysical Parammentioning

confidence: 99%

Imaging Spectrometry of Inland and Coastal Waters: State of the Art, Achievements and Perspectives

et al. 2018

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Imaging spectrometry of non-oceanic aquatic ecosystems has been in development since the late 1980s when the first airborne hyperspectral sensors were deployed over lakes. Most water quality management applications were, however, developed using multispectral mid-spatial resolution satellites or coarse spatial resolution ocean colour satellites till now. This situation is about to change with a suite of upcoming imaging spectrometers being deployed from experimental satellites or from the International Space Station. We review the science of developing applications for inland and coastal aquatic ecosystems * C. Giardino

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Section: Water Quality Monitoring and Assessment Of Biophysical Parammentioning

confidence: 99%

Imaging Spectrometry of Inland and Coastal Waters: State of the Art, Achievements and Perspectives

et al. 2018

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“…Regarding the crustal tracer, there is no specific rule for the choice of a crustal reference element, except that it must not be affected by anthropogenic factors. Ca 2+ is widely used as a reference for continental emissions or terrestrial crust (Calvo et al, 2012;Khan et al, 2018;Martins et al, 2019;Zhang et al, 2007), as its composition in the soil is hardly changed. The abundance of Ca 2+ in the Earth's crust was taken from Taylor (1964) and Zhang et al (2007).…”

Section: Calculationsmentioning

confidence: 99%

Chemical composition of rainwater under two events of aerosol transport: A Saharan dust outbreak and wildfires

Oduber

Calvo

Castro

et al. 2020

Science of The Total Environment

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Rainwater composition is affected by both local and long-range transport aerosols.• The emissions of organic species by biomass burning act by acidifying the water • The entry of crustal elements into the atmosphere helps neutralize rainwater. • The amount and intensity of precipitation influence the composition of rainwater.• The rainwater composition is also linked to the physical properties of raindrops.

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“…Industrialization, traffic development, and population concentration in urban areas have caused severe air pollution problems and affected the health and environmental quality of residents who live in cities and nearby areas. Air pollution, atmospheric aerosols, and precipitation acidification are common phenomena that are interrelated [1]. Air pollutants are accumulated or removed through atmospheric dry and wet deposition.…”

Section: Introductionmentioning

confidence: 99%

“…Continental wet deposition has a higher concentration of man-made ions than neutral marine rain, particularly when it comes to acidic material in urban and rural atmospheric precipitation. Thus, acid rain has become a global environmental problem [1]. Changes in the ion concentration in wet deposition are notably related to the source of the air mass, particularly when the air mass source contains other non-sea-salt sources (such as sand dust, biomass burning, and fossil fuel combustion).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Components and Sources of Acid Deposition in Northeast Asia: A Case Study of the Coastal and Metropolitan Cities in Northern Taiwan

et al. 2020

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In this study, temporal variations, major ion reference indexes, correlation analysis, and statistical data were used to investigate the chemical characteristics of the atmospheric pollutants in wet deposition and reasons for their formation, and further insight into the impact of local and regional atmospheric pollutant distributions on urban and coastal area environments. From November 2014 to October 2015, 158 rainwater samples were collected in coastal Wanli and urban Banqiao of southern Northeast Asia (northern Taiwan). The mean pH of the coastal and urban was 4.63 and 4.58, respectively, lower than the mean (5.31) of 10 East Asia regions during the year of 2015. This was possibly because the concentration of the combined SO42− and NO3− in the study area were greater than the mean of the 10 East Asian regions. This is verified by the calculation of sea-salt fraction (SSF) and non-SSF fraction (NSSF) in study areas, which indicated that Na+ and Cl− accounted for over 85% of the SSF, without Na+ in Banqiao, were mainly due to marine sources. For the NSSF, in addition to SO42− in Wanli, nearly 90% of wet disposition was from SO42− and NO3−, which were emitted from human activities. Furthermore, the analysis of fractional acidity (FA), neutralization factors (NF), neutralization potential (NP), and acidification potential (AP) revealed that acidified precipitation was caused by a lack of neutralizing compounds, which resulted in less neutralization of acidic precipitation. Finally, the results of correlation and principal component analysis (PCA) indicated that because coastal area were geographically closer to the ocean, wet deposition mainly comes from marine sources. However, in urban with a high population density and high traffic quantity, the ions in wet deposition primarily come from anthropogenic activities, such as industrial combustion and vehicle emissions.

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Physicochemical factors and their potential sources inferred from long-term rainfall measurements at an urban and a remote rural site in tropical areas

Cited by 31 publications

References 69 publications

Imaging Spectrometry of Inland and Coastal Waters: State of the Art, Achievements and Perspectives

Imaging Spectrometry of Inland and Coastal Waters: State of the Art, Achievements and Perspectives

Chemical composition of rainwater under two events of aerosol transport: A Saharan dust outbreak and wildfires

Assessment of the Components and Sources of Acid Deposition in Northeast Asia: A Case Study of the Coastal and Metropolitan Cities in Northern Taiwan

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