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Spatio-temporal comparison of neustonic microplastic density in Hong Kong waters under the influence of the Pearl River Estuary
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Spatial and temporal surveys of microplastic density in Hong Kong surface waters found elevated concentrations near the Pearl River Estuary and seasonal variation linked to river discharge. The study provides empirical evidence that river outflow from China's Pearl River is a significant driver of coastal microplastic distribution in Hong Kong waters.
Rivers are recognised as an important source of plastic debris in the open sea. The Pearl River in China is estimated to transport 0.1milliontonnes of plastic waste to the open sea annually. However, no empirical study has been conducted to assess the plastic contamination levels in the Pearl River Estuary. Hong Kong is situated in the east of the Pearl River Estuary; its western waters are strongly influenced by river discharge, whereas the eastern waters are unaffected by the freshwater plume. In this study, we quantified the neustonic plastic debris density in the western and eastern waters of Hong Kong. The mean microplastic (0.355-4.749mm) and large plastic debris (≥4.75mm) densities in the western side were 3.627 and 0.758n/m, respectively. Seasonal comparisons indicated that both size classes of plastic debris were significantly more abundant by number in the rainy season than the dry season (p<0.001). However, the influence of rivers on plastic density at the sea surface may be highly restricted to the estuarine delta, as no significant spatial difference was found between the western and eastern waters.
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Spatial and temporal variabilities of the microplastic pollution in Hong Kong coastline
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A multi-year study of microplastic contamination in Hong Kong coastal waters identified significant temporal variability linked to seasonal factors, particularly monsoon rainfall and ocean currents from the Pearl River. Microplastic concentrations were highest during and after typhoon season when river discharge and storm runoff peak. The findings suggest that seasonal and meteorological factors must be accounted for when interpreting microplastic monitoring data in coastal Asian cities.
Microplastics in Hong Kong's marine waters: Impact of rainfall and Pearl River discharge
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Researchers systematically tracked microplastic levels in Hong Kong's coastal waters from 2019 to 2021 and found that seasonal rainfall was a much bigger driver of contamination than pandemic-related factors like mask use. Microplastic abundance was significantly higher during the wet season, with surface runoff from rain carrying land-based pollution into the ocean. Sites closer to the Pearl River Delta had the highest levels, indicating that river discharge is a major source of marine microplastic contamination in the region.
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Researchers found that microplastic abundance in the Pearl River Estuary coastal region was 1.85-fold higher during the rainy season than the dry season, with concentrations decreasing from river to estuary to open sea. Fibers and fragments dominated, with gray, white, and green particles most common across sampling sites.
Hong Kong at the Pearl River Estuary: A hotspot of microplastic pollution
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Beach surveys around Hong Kong found microplastic densities averaging over 5,500 items per square meter, higher than many other reported coastal areas, with expanded polystyrene dominating. The high contamination reflects Hong Kong's position at the heavily polluted Pearl River Estuary and underscores the regional plastic pollution problem.
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Seasonal surveys of surface water and sediments across four coastal locations in Hong Kong found microplastics at all sites, with the highest concentrations in the most urbanized harbor areas. This first comprehensive study of Hong Kong coastal waters reveals that even heavily trafficked port environments accumulate large quantities of microplastic pollution.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.