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Two drifting paths of Sargassum bloom in the Yellow Sea and East China Sea during 2019-2020

Acta Oceanologica Sinica 2022年第6期41卷 78-87页

作者： Chao Yuan Jie Xiao Xuelei Zhang Mingzhu Fu Zongling Wang The MNR Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory of Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China National Engineering Laboratory for Integrated Aero-Space-Ground-Ocean Big Data Application Technology Xi'an 710129China

The macroalgal blooms of floating brown algae Sargassum horneri are increasing in the Yellow Sea and East China Sea during the past few years.However,the annual pattern of Sargassum bloom is not well characterized.To study the developing pattern and explore the impacts from hydro-meteorologic environment,high resolution satellite imageries were used to monitor the distribution,coverage and drifting of the pelagic Sargassum rafts in the Yellow Sea and East China Sea from September 2019 to August 2020.Sargassum blooms were detected from October 2019 to June 2020 and presented two successive drifting paths that both initiated from around 37°N.The first path spanned smaller spatial scale and shorter period,starting with a bloom of 3 km^(2) distribution area near the eastern tip of Shandong Peninsula in late October 2019 and drifted southwards,hit the Pyropia aquaculture area in early January 2020,then vanished in the northwest of East China Sea(ca.32°N)around end of January.The second path began with a large distribution area of 23000 km^(2) east of 123°E in late January 2020,firstly moved southwards in the central Yellow Sea and northern East China Sea(north of 29°N)till late April,then turned northwards with monsoon wind and vanished from late June to August.The mean sea surface temperature of 8℃ to 20℃ in the Sargassum bloom areas corresponded to in situ observed temperature range for vegetative growth and floating of S.horneri.There was no observed floating Sargassum blooms during July through September in the Yellow Sea and East China Sea.The results indicate that floating S.horneri is unable to complete life cycle in the Yellow Sea and East China Sea,and provide insights to the future management of Sargassum blooms.Further studies are needed to validate the pattern and source of annual Sargassum bloom in the Yellow Sea and East China Sea.

关键词： Sargassum horneri macroalgal bloom high resolution remote sensing wind directions sea surface temperature Yellow Sea and East China Sea

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Enhancement of Thermo-Flow Performances by windbreakers for Two-Tower Indirect Dry Cooling System

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Journal of Thermal Science 2020年第3期29卷 676-686页

作者： YAN Jingbo WANG Weijia CHEN Lei YANG Lijun DU Xiaoze School of Energy Power and Mechanical Engineering North China Electric Power UniversityBejjing 102206China

The winds will greatly weaken the cooling performance of indirect dry cooling system with twin towers.The exterior windbreakers are recommended to restrain the wind adverse effects in this paper.The macro heat exchanger model was adopted to simulate the heat exchange between circulating water and ambient air.The performances of natural draft dry cooling system(NDDCS)with and without exterior windbreakers were numerically studied.The pressure,velocity and temperature distribution of cooling air in wind angles of 0°,45°and 90°was obtained and presented.The results show that in all wind directions,the performances for lateral sector of towers with windbreakers are significantly improved,but the low-pressure zone appears unexpectedly for the rear sectors,which reduces the air flow rate.The cooling performances of the twin towers with or without windbreakers decrease at first but then recover with the wind velocity increasing.Besides,the optimal flow and heat transfer performances appear in the wind angle of 0°.The cooling performances can be significantly improved in all three wind directions due to windbreaker configuration.

关键词： indirect dry cooling system twin towers windbreakers wind directions flow and heat transfer performances

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Study of Total Quantity Control of Air Pollutants in Planning Industrial District

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Biomedical and Environmental Sciences 2000年第4期13卷 300-306页

作者： HONGYAN－FENG LIUFAN 等 InstituteofEnvironmentalHealthandSanitaryEngineering ChineseAcademyofPreventiveedicineBejing100050China InstituteofEnvironmentalHealthandSanitaryEngineering ChineseAcademyofPrev

The total quantity control of pollutant emissions for an industrial district is determined by coefficient (A) method (Qian, 1990). It is suggested that average daily concentrations of air pollutants should be estimated in relation with metrological parameters, such as wind directions, wind speed and atmospheric stability in the period of monitoring by Gaussian model (SEPB, 1991), and that the sources of pollution should be redistributed on the basis of the result of monitoring with a view improving local atmosphere environment.

关键词： atmospheric stability pollutant emissions quantity control wind directions Gaussian model

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