Mass Deposition Fluxes of Asian Dust to the Bohai Sea and Yellow Sea from Geostationary Satellite MTSAT: A Case Study

Tu, Qianguang; Hao, Zengzhou; Pan, Delu

doi:10.3390/atmos6111771

Cited by 8 publications

(3 citation statements)

References 32 publications

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“…Windblown dusts play an important role in marine ecosystems once the dusts are deposited and dissolved (Tu et al, ). Approximately 63.9% of sand and dust events likely affect seas in China (Zhang et al, ), and the deposition fluxes of particulate phosphorus during the dust storm events associated with precipitation were approximately 500–1,000 times greater than the daily average flux during nondust days in the Yellow Sea (Shi et al, ).…”

Section: Discussionmentioning

confidence: 99%

Long‐Term Nutrient Variations in the Bohai Sea Over the Past 40 Years

et al. 2019

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As China's only continental sea, the Bohai Sea is a relatively closed environment and is vulnerable to natural changes and human activities. In this paper, the long-term variations in nutrients in the Bohai Sea and the potential influencing factors were analyzed based on historical summer and winter data from 1978 to 2016. The results showed that the concentrations of dissolved inorganic nitrogen (DIN) in the Bohai Sea continuously increased from 1990 and rapidly increased after 2002, the phosphate (PO 4 -P) concentration exhibited a decreasing trend, and the silicate (SiO 3 -Si) concentration decreased from 1978 to 1987 and increased from 1987 to 2008. The nutrient concentrations were lower in summer than in winter, and the bottom concentrations were higher than the surface concentrations in summer, whereas the vertical differences were insignificant in winter. The dominant factor determining the long-term variations in DIN were atmospheric deposition and nonpoint sources due to various human activities; the primary factors affecting PO 4 -P were riverine inputs and nonpoint sources related to natural changes and human activities; the primary factors afftecting SiO 3 -Si were riverine inputs. The N/P ratio followed the DIN variation, the Si/P ratio followed the SiO 3 -Si variation, and the Si/N ratio decreased. The nutrient ratios were lower at the bottom than at the surface and were lower in winter than in summer. The nutrient limitation changed from nitrogen limitation to phosphorus and silicon limitations. The long-term nutrient variations in the Bohai Sea have potential ecological impacts on the local red tide features.Plain Language Summary Nutrients are important to primary productivity and thus important to marine ecosystems. Nutrient variations in coastal oceans may potentially impact the occurrence of ecological disasters. As the only continental sea in China, the Bohai Sea is a relatively closed environment and is vulnerable to natural and anthropogenic impacts. We found that the concentration of dissolved inorganic nitrogen in the Bohai Sea increased from 1990 to 2006; the phosphate concentration decreased from 1978 to 2016, and the silicate concentration decreased before 1987 and increased after 1987. We also found that N/P increased and Si/N decreased. The nutrient concentrations were higher, whereas the nutrient ratios were lower in winter than in summer. In summer, the bottom nutrient concentrations were higher than the surface concentrations, whereas the bottom ratios were lower than the surface ratios; in winter, the vertical differences were insignificant. The primary factors driving the silicate variations were riverine inputs related to natural changes and human activities; the primary factors in the phosphate variations could be riverine inputs and nonpoint sources related to natural changes and human activities; the dominant factor in the dissolved inorganic nitrogen variations could be atmospheric deposition and nonpoint sources due to various human activities. The red tide features in the...

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Section: Discussionmentioning

confidence: 99%

Long‐Term Nutrient Variations in the Bohai Sea Over the Past 40 Years

et al. 2019

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“…It is vital that improvements to the methodology are developed to enhance accuracy. The current accuracy of the regression method (AOD to GLCs) is estimated to be twenty percent and the uncertainty of the aerosol model (wavelength signal intensity to AOD) is estimated to be thirty percent (Basha et al, 2015;Tu et al, 2015). However, researchers caution that the regression coefficients are not transferable to other regions and the true uncertainty could be an order of magnitude higher if assumptions in the aerosol model are not taken into consideration (Basha et al, 2015;Tu et al, 2015).…”

Section: Validation/accuracymentioning

confidence: 99%

“…The current accuracy of the regression method (AOD to GLCs) is estimated to be twenty percent and the uncertainty of the aerosol model (wavelength signal intensity to AOD) is estimated to be thirty percent (Basha et al, 2015;Tu et al, 2015). However, researchers caution that the regression coefficients are not transferable to other regions and the true uncertainty could be an order of magnitude higher if assumptions in the aerosol model are not taken into consideration (Basha et al, 2015;Tu et al, 2015). This has been clearly demonstrated in validation studies that have compared multiple satellite products across an area and significant disagreements between them were ascribed to uncertainties in the aerosol retrieval properties of mass, size, and composition (Reid et al, 2013).…”

Section: Validation/accuracymentioning

confidence: 99%

Working with the enemy? Social work education and men who use intimate partner violence

Jury

Boxall

2018

Social Work Education

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The accurate measurements of natural and anthropogenic aerosol particulate matter (PM) is important in managing both environmental and health risks; however, limited monitoring in regional areas hinders accurate quantification. This article provides an overview of the ability of recently launched geostationary earth orbit (GEO) satellites, such as GOES-R (North America) and HIMAWARI (Asia and Oceania), to provide near real-time ground-level PM concentrations (GLCs). The review examines the literature relating to the spatial and temporal resolution required by air quality studies, the removal of cloud and surface effects, the aerosol inversion problem, and the computation of ground-level concentrations rather than columnar aerosol optical depth (AOD). Determining surface PM concentrations using remote sensing is complicated by differentiating intrinsic aerosol properties (size, shape, composition, and quantity) from extrinsic signal intensities, particularly as the number of unknown intrinsic parameters exceeds the number of known extrinsic measurements. The review confirms that development of GEO satellite products has led to improvements in the use of coupled products such as GEOS-CHEM, aerosol types have consolidated on model species rather than prior descriptive classifications, and forward radiative transfer models have led to a better understanding of predictive spectra interdependencies across different aerosol types, despite fewer wavelength bands. However, it is apparent that the aerosol inversion problem remains challenging because there are limited wavelength bands for characterising localised mineralogy. The review finds that the frequency of GEO satellite data exceeds the temporal resolution required for air quality studies, but the spatial resolution is too coarse for localised air quality studies. Continual monitoring necessitates using the less sensitive thermal infra-red bands, which also reduce surface absorption effects. However, given the challenges of the aerosol inversion problem and difficulties in converting columnar AOD to surface concentrations, the review identifies coupled GEO-neural networks as potentially the most viable option for improving quantification.

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