Firstly,the occurrence characteristics of cyanobacterial bloom in Hulun Lake were analyzed.Then,based on the data of daily average temperature and wind speed in Manzhouli and New Barag Right Banner from 2020 to 2025,t...Firstly,the occurrence characteristics of cyanobacterial bloom in Hulun Lake were analyzed.Then,based on the data of daily average temperature and wind speed in Manzhouli and New Barag Right Banner from 2020 to 2025,the meteorological conditions suitable for the outbreak of cyanobacterial bloom were analyzed,and the temporal and spatial distribution characteristics of cyanobacterial bloom in Hulun Lake under remote sensing monitoring were further verified.Finally,measures for controlling cyanobacterial bloom were proposed.展开更多
Two rectangular-shaped lakes,Lake Hulun and Lake Buir,located at the boundary between China and Mongolia,only c.75 km apart and therefore experiencing similar wind fields,have been studied based on satellite images an...Two rectangular-shaped lakes,Lake Hulun and Lake Buir,located at the boundary between China and Mongolia,only c.75 km apart and therefore experiencing similar wind fields,have been studied based on satellite images and field surveys in order to compare their geomorphological and sedimentological characteristics.The wind-driven hydrodynamics,which have a significant effect on the development of littoral landforms and on sediment distribution,have been discussed for the two similar lakes that experienced a prevailing wind perpendicular to their long axis.A conceptual model related to wind-driven water bodies and sediment distribution is proposed.Wave-influenced to wave-dominated deltas,beaches,spits,and eolian dune deposits develop around these two lakes,with a strikingly similar distribution pattern.These features locally inform the longshore drift and help reconstruct the water circulation induced by wind forcing.Under the NW prevailing wind regime,the spits developed on the SW coast with a NW—SE extension,which was influenced by the NW—SE longshore currents.The same influence was observed in the delta extension in the NE area.The differences lie in the presence of fan deltas in the NW region of Lake Hulun,but not in Lake Buir.Additionally,the width of the beach and eolian deposits on the downwind coast of Lake Hulun is three times greater than that of Lake Buir which were caused by the differences in sediment supply and wind fetch between the two lakes.Lake Hulun and Lake Buir provide two reliable examples to understand the relationship among the wind field,provenance,hydrodynamics,landforms,and asymmetrical distribution of clastics in elongated lakes.They also represent relevant modern analogs,which may also be of guiding significance to wind-driven sand body prediction in lacustrine basins.展开更多
The changes of magnetic susceptibility(κ) are correlated with those of corresponding sedimentological, geochemical, mineralogical and biological results, which verifies thatκ can be taken as one of the environmental...The changes of magnetic susceptibility(κ) are correlated with those of corresponding sedimentological, geochemical, mineralogical and biological results, which verifies thatκ can be taken as one of the environmental proxies. However, usually the exact origin of magnetic signal is poorly understood, and is difficult to relate with the environmental evolution. Magnetic properties of material derived from the catchment and sedimentary environment may affect the accumulation, preservation, or authigenesis and diagenesis of magnetic minerals. In the Lake Hulun region in Inner Mongolia, it is found that muddy sediments, deposited during high water level period (corresponding to humid climate), have comparatively highκ values. In contrast, the sandy sediments, deposited during low water level period (corresponding to arid climate), have lowκ values. Detailed rock magnetic investigation confirms that detrital magnetite derived from volcanic rocks in the catchment exists in both muddy and sandy sediments. During high water level period, secondary ferrimagnetic iron sulphide was produced in muddy sediments under relatively reductive conditions. Ferrimagnetic iron sulphide, coexisting with detrital magnetite, predominates the magnetic properties of muddy sediments, resulting in increasingκ. This paper reveals the significance of authigenic ferrimagnetic iron sulphide produced after sediment deposition.展开更多
Heat flux is important for studying interactions between atmosphere and lake.The heat exchange between air-water interfaces is one of the important ways to govern the temperature of the water surface.Heat exchange bet...Heat flux is important for studying interactions between atmosphere and lake.The heat exchange between air-water interfaces is one of the important ways to govern the temperature of the water surface.Heat exchange between the air-water interfaces and the surrounding environment is completed by solar radiation,conduction,and evaporation,and all these processes mainly occur at the air-water interface.Hulun Lake was the biggest lake which is also an important link and an indispensable part of the water cycle in Northeast China.This study mapped surface energy budget to better understand spatial and temporal variations in Hulun Lake in China from 2001 to 2018.Descriptive statistics were computed to build a historical time series of mean monthly heat flux at daytime and nighttime from June to September during 2001–2018.Remote sensing estimation methods we used was suitable for Hulun Lake(R2=0.81).At month scale,shortwave radiation and latent heat flux were decrease from June to September.However,the maximum sensible heat flux appeared in September.Net longwave radiation was the largest in August.The effective heat budget showed that Hulun Lake gained heat in the frost-free season with highest value in June(686.31 W/m2),and then steadily decreased to September(439.76 W/m2).At annual scale,net longwave radiation,sensible heat flux and latent heat flux all show significant growth trend from 2001 to 2018(P<0.01).Wind speed had the well correlation on sensible heat flux and latent heat flux.Water surface temperature showed the highest coefficient in sensitivity analysis.展开更多
Many per-and poly-fluoroalkyl substances(PFAS)studies in environmental media have been conducted in heavily industrialized and densely populated areas.However,there has been limited research on legacy and emerging PFA...Many per-and poly-fluoroalkyl substances(PFAS)studies in environmental media have been conducted in heavily industrialized and densely populated areas.However,there has been limited research on legacy and emerging PFAS contamination in cold and arid regions.In the present study,we investigated the concentrations of 30 PFAS compounds in the surface water and sediment of Hulun Lake and its inflowing rivers.The main components in water were short chain perfluoroalkyl carboxylic acids(PFCAs)in both Hulun Lake(33.57%)and its inflowing rivers(30.47%).However,long chain perfluoroalkane sulfonates(PFSAs)and long chain PFCAs accounted for more than half of the total PFAS content in sediment.Total PFAS concentrations(∑_(30)PFAS)ranged from 3.67 to 8.84 ng/L in water,and 0.97-1.73 mg/kg in sediment.Significant spatial differences were apparent between Hulun Lake and its inflowing rivers in both water and sediment samples.Source apportionment revealed that wastewater,aqueous film forming foams,textiles and paper-based food packaging,and paper products and cosmetics were the primary sources of PFAS.The partitioning coefficients of PFCAs were dependent on the carbon chain length.Temperature,conductivity,pH,salinity,chemical oxygen demand,total phosphorus(TP),total nitrogen(TN),As,and oxidation-reduction potential were the main influencing factors in water.Heavy metals(Co,Pb,Cu,Ni,Hg,Cd,and As),TP,salinity,and pH were positively correlated with the PFAS concentration in sediment.Furthermore,Hailar River contributed the majority(99.74%,~15.05 kg/year)of the PFAS mass flux.This is the first study showing PFAS contamination in Hulun Lake and the results suggest that long term monitoring is needed for the effective control of PFAS pollution in this typical cold and arid region of China.展开更多
基金Supported by the Project of Estimation of Future Changes in Water Resources in Hulun Lake under Climate Change Based on CMIP6(hlbeqx202507).
文摘Firstly,the occurrence characteristics of cyanobacterial bloom in Hulun Lake were analyzed.Then,based on the data of daily average temperature and wind speed in Manzhouli and New Barag Right Banner from 2020 to 2025,the meteorological conditions suitable for the outbreak of cyanobacterial bloom were analyzed,and the temporal and spatial distribution characteristics of cyanobacterial bloom in Hulun Lake under remote sensing monitoring were further verified.Finally,measures for controlling cyanobacterial bloom were proposed.
基金supported by the National Science and Technology Special Project(No.2017ZX05009-002)the Fundamental Research Funds for the Central Universitiessupported by CNES through the funding of his postdoctoral fellowship。
文摘Two rectangular-shaped lakes,Lake Hulun and Lake Buir,located at the boundary between China and Mongolia,only c.75 km apart and therefore experiencing similar wind fields,have been studied based on satellite images and field surveys in order to compare their geomorphological and sedimentological characteristics.The wind-driven hydrodynamics,which have a significant effect on the development of littoral landforms and on sediment distribution,have been discussed for the two similar lakes that experienced a prevailing wind perpendicular to their long axis.A conceptual model related to wind-driven water bodies and sediment distribution is proposed.Wave-influenced to wave-dominated deltas,beaches,spits,and eolian dune deposits develop around these two lakes,with a strikingly similar distribution pattern.These features locally inform the longshore drift and help reconstruct the water circulation induced by wind forcing.Under the NW prevailing wind regime,the spits developed on the SW coast with a NW—SE extension,which was influenced by the NW—SE longshore currents.The same influence was observed in the delta extension in the NE area.The differences lie in the presence of fan deltas in the NW region of Lake Hulun,but not in Lake Buir.Additionally,the width of the beach and eolian deposits on the downwind coast of Lake Hulun is three times greater than that of Lake Buir which were caused by the differences in sediment supply and wind fetch between the two lakes.Lake Hulun and Lake Buir provide two reliable examples to understand the relationship among the wind field,provenance,hydrodynamics,landforms,and asymmetrical distribution of clastics in elongated lakes.They also represent relevant modern analogs,which may also be of guiding significance to wind-driven sand body prediction in lacustrine basins.
文摘The changes of magnetic susceptibility(κ) are correlated with those of corresponding sedimentological, geochemical, mineralogical and biological results, which verifies thatκ can be taken as one of the environmental proxies. However, usually the exact origin of magnetic signal is poorly understood, and is difficult to relate with the environmental evolution. Magnetic properties of material derived from the catchment and sedimentary environment may affect the accumulation, preservation, or authigenesis and diagenesis of magnetic minerals. In the Lake Hulun region in Inner Mongolia, it is found that muddy sediments, deposited during high water level period (corresponding to humid climate), have comparatively highκ values. In contrast, the sandy sediments, deposited during low water level period (corresponding to arid climate), have lowκ values. Detailed rock magnetic investigation confirms that detrital magnetite derived from volcanic rocks in the catchment exists in both muddy and sandy sediments. During high water level period, secondary ferrimagnetic iron sulphide was produced in muddy sediments under relatively reductive conditions. Ferrimagnetic iron sulphide, coexisting with detrital magnetite, predominates the magnetic properties of muddy sediments, resulting in increasingκ. This paper reveals the significance of authigenic ferrimagnetic iron sulphide produced after sediment deposition.
基金Under the auspices of National Key Research and Development Program of China(No.2016YFA0602301,2016YFB0501502)Strategic Planning Project of the Northeast Institute of Geography and Agroecology(IGA),Chinese Academy of Sciences(No.Y6H2091001)National Forestry Science and Technology Demonstration Promotion Project(No.JLT2018-03)。
文摘Heat flux is important for studying interactions between atmosphere and lake.The heat exchange between air-water interfaces is one of the important ways to govern the temperature of the water surface.Heat exchange between the air-water interfaces and the surrounding environment is completed by solar radiation,conduction,and evaporation,and all these processes mainly occur at the air-water interface.Hulun Lake was the biggest lake which is also an important link and an indispensable part of the water cycle in Northeast China.This study mapped surface energy budget to better understand spatial and temporal variations in Hulun Lake in China from 2001 to 2018.Descriptive statistics were computed to build a historical time series of mean monthly heat flux at daytime and nighttime from June to September during 2001–2018.Remote sensing estimation methods we used was suitable for Hulun Lake(R2=0.81).At month scale,shortwave radiation and latent heat flux were decrease from June to September.However,the maximum sensible heat flux appeared in September.Net longwave radiation was the largest in August.The effective heat budget showed that Hulun Lake gained heat in the frost-free season with highest value in June(686.31 W/m2),and then steadily decreased to September(439.76 W/m2).At annual scale,net longwave radiation,sensible heat flux and latent heat flux all show significant growth trend from 2001 to 2018(P<0.01).Wind speed had the well correlation on sensible heat flux and latent heat flux.Water surface temperature showed the highest coefficient in sensitivity analysis.
基金supported by the National Science Fund for Distinguished Young Scholars(No.52125901)the Natural Science Foundation of Shandong(Grant No.ZR2023QE199).
文摘Many per-and poly-fluoroalkyl substances(PFAS)studies in environmental media have been conducted in heavily industrialized and densely populated areas.However,there has been limited research on legacy and emerging PFAS contamination in cold and arid regions.In the present study,we investigated the concentrations of 30 PFAS compounds in the surface water and sediment of Hulun Lake and its inflowing rivers.The main components in water were short chain perfluoroalkyl carboxylic acids(PFCAs)in both Hulun Lake(33.57%)and its inflowing rivers(30.47%).However,long chain perfluoroalkane sulfonates(PFSAs)and long chain PFCAs accounted for more than half of the total PFAS content in sediment.Total PFAS concentrations(∑_(30)PFAS)ranged from 3.67 to 8.84 ng/L in water,and 0.97-1.73 mg/kg in sediment.Significant spatial differences were apparent between Hulun Lake and its inflowing rivers in both water and sediment samples.Source apportionment revealed that wastewater,aqueous film forming foams,textiles and paper-based food packaging,and paper products and cosmetics were the primary sources of PFAS.The partitioning coefficients of PFCAs were dependent on the carbon chain length.Temperature,conductivity,pH,salinity,chemical oxygen demand,total phosphorus(TP),total nitrogen(TN),As,and oxidation-reduction potential were the main influencing factors in water.Heavy metals(Co,Pb,Cu,Ni,Hg,Cd,and As),TP,salinity,and pH were positively correlated with the PFAS concentration in sediment.Furthermore,Hailar River contributed the majority(99.74%,~15.05 kg/year)of the PFAS mass flux.This is the first study showing PFAS contamination in Hulun Lake and the results suggest that long term monitoring is needed for the effective control of PFAS pollution in this typical cold and arid region of China.
