为了低碳高效地资源化利用工程渣土,采用碱激发材料来固化工程渣土,研究不同碱激发剂激活矿渣/粉煤灰对所得固化土的工作性能、抗压强度、表观密度和线收缩的影响,采用XRD和SEM分析固化土的矿物相和微观形貌,最后分析不同配方固化土的...为了低碳高效地资源化利用工程渣土,采用碱激发材料来固化工程渣土,研究不同碱激发剂激活矿渣/粉煤灰对所得固化土的工作性能、抗压强度、表观密度和线收缩的影响,采用XRD和SEM分析固化土的矿物相和微观形貌,最后分析不同配方固化土的碳排放和碳强比.结果表明:利用碱激发材料固化渣土可得到强度大于10 MPa、密度约1700 kg/m^(3)、线收缩小于1%的建筑材料,固化土的反应产物主要为C-A-S-H、C-S-H和碳酸钙.矿渣的固化效果强于粉煤灰,且碳排放和碳强比更低(约2.2-4.8 kg CO_(2)e/(t·MPa)).标准养护条件下,相较于水玻璃和氢氧化钠,使用硅灰替代水玻璃,会使固化土的流动性降低4%»5%、抗压强度降低41.9%、碳排放降低41%-43%,但碳强比基本不变;使用生石灰作为激发剂,会使固化土的流动性降低18%»19%、抗压强度降低23.9%、碳排放降低64%-66%,并降低碳强比,但需要养护来保证生石灰的激发效果.展开更多
At present,the identification of tropical cyclone remote precipitation(TRP)requires subjective participation,leading to inconsistent results among different researchers despite adopting the same identification standar...At present,the identification of tropical cyclone remote precipitation(TRP)requires subjective participation,leading to inconsistent results among different researchers despite adopting the same identification standard.Thus,establishing an objective identification method is greatly important.In this study,an objective synoptic analysis technique for TRP(OSAT_TRP)is proposed to identify TRP using daily precipitation datasets,historical tropical cyclone(TC)track data,and the ERA5 reanalysis data.This method includes three steps:first,independent rain belts are separated,and those that might relate to TCs'remote effects are distinguished according to their distance from the TCs.Second,the strong water vapor transport belt from the TC is identified using integrated horizontal water vapor transport(IVT).Third,TRP is distinguished by connecting the first two steps.The TRP obtained through this method can satisfy three criteria,as follows:1)the precipitation occurs outside the circulation of TCs,2)the precipitation is affected by TCs,and 3)a gap exists between the TRP and TC rain belt.Case diagnosis analysis,compared with subjective TRP results and backward trajectory analyses using HYSPLIT,indicates that OSAT_TRP can distinguish TRP even when multiple TCs in the Northwest Pacific are involved.Then,we applied the OSAT_TRP to select typical TRPs and obtained the synoptic-scale environments of the TRP through composite analysis.展开更多
In this study,the characteristics and preliminary causes of tropical cyclone remote precipitation(TRP)over China during the period from 1979 to 2020 are investigated.Results indicated that approximately 72.42%of tropi...In this study,the characteristics and preliminary causes of tropical cyclone remote precipitation(TRP)over China during the period from 1979 to 2020 are investigated.Results indicated that approximately 72.42%of tropical cyclones(TCs)in the Western Pacific produce TRP over China.The peak months for TRP are July and August.The four key regions of TRP are the adjacent areas between the Sichuan and Shaanxi Provinces,the northern coast of the Bohai Sea,the coast of the Yellow Sea,and the southern coast area.The typical distance between the station with TRP and the TC center ranges from 1500 to 2500 km.Most of these stations are situated north to 60°west of north of the TC.The south–west water vapor transportation on the west side of the TC is crucial to TRP.TRP has a decreasing trend because of the decrease in the number of TCs that generate TRP.From the perspective of large-scale environmental conditions,a decrease in the integrated horizontal water vapor transport in China' Mainland,the weakening of upward motion at approximately 25°–35°N,which is inconducive to convection,and an increase in low-level vertical wind shear,which is unfavorable for the development of TC in areas with high frequencies of TRP-related TCs,are the factors that result in the decreasing trend of TRP.展开更多
文摘为了低碳高效地资源化利用工程渣土,采用碱激发材料来固化工程渣土,研究不同碱激发剂激活矿渣/粉煤灰对所得固化土的工作性能、抗压强度、表观密度和线收缩的影响,采用XRD和SEM分析固化土的矿物相和微观形貌,最后分析不同配方固化土的碳排放和碳强比.结果表明:利用碱激发材料固化渣土可得到强度大于10 MPa、密度约1700 kg/m^(3)、线收缩小于1%的建筑材料,固化土的反应产物主要为C-A-S-H、C-S-H和碳酸钙.矿渣的固化效果强于粉煤灰,且碳排放和碳强比更低(约2.2-4.8 kg CO_(2)e/(t·MPa)).标准养护条件下,相较于水玻璃和氢氧化钠,使用硅灰替代水玻璃,会使固化土的流动性降低4%»5%、抗压强度降低41.9%、碳排放降低41%-43%,但碳强比基本不变;使用生石灰作为激发剂,会使固化土的流动性降低18%»19%、抗压强度降低23.9%、碳排放降低64%-66%,并降低碳强比,但需要养护来保证生石灰的激发效果.
基金supported by the Postgraduate Research&Practice Innovation Program of Jiangsu Province(No.KYCX22_1136)the National Natural Scientific Foundation of China(No.42275037)+2 种基金the Basic Research Fund of CAMS(No.2023Z016)the Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province(No.SCSF202202)supported by the Jiangsu Collaborative Innovation Center for Climate Change。
文摘At present,the identification of tropical cyclone remote precipitation(TRP)requires subjective participation,leading to inconsistent results among different researchers despite adopting the same identification standard.Thus,establishing an objective identification method is greatly important.In this study,an objective synoptic analysis technique for TRP(OSAT_TRP)is proposed to identify TRP using daily precipitation datasets,historical tropical cyclone(TC)track data,and the ERA5 reanalysis data.This method includes three steps:first,independent rain belts are separated,and those that might relate to TCs'remote effects are distinguished according to their distance from the TCs.Second,the strong water vapor transport belt from the TC is identified using integrated horizontal water vapor transport(IVT).Third,TRP is distinguished by connecting the first two steps.The TRP obtained through this method can satisfy three criteria,as follows:1)the precipitation occurs outside the circulation of TCs,2)the precipitation is affected by TCs,and 3)a gap exists between the TRP and TC rain belt.Case diagnosis analysis,compared with subjective TRP results and backward trajectory analyses using HYSPLIT,indicates that OSAT_TRP can distinguish TRP even when multiple TCs in the Northwest Pacific are involved.Then,we applied the OSAT_TRP to select typical TRPs and obtained the synoptic-scale environments of the TRP through composite analysis.
基金supported by the Postgraduate Research&Practice Innovation Program of Jiangsu Province (No.KYCX22_1136)the National Natural Scientific Foundation of China (No.42275037)+2 种基金the Basic Research Fund of CAMS (No.2023Z016)the Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province (No.SCSF202202)supported by the Jiangsu Collaborative Innovation Center for Climate Change。
文摘In this study,the characteristics and preliminary causes of tropical cyclone remote precipitation(TRP)over China during the period from 1979 to 2020 are investigated.Results indicated that approximately 72.42%of tropical cyclones(TCs)in the Western Pacific produce TRP over China.The peak months for TRP are July and August.The four key regions of TRP are the adjacent areas between the Sichuan and Shaanxi Provinces,the northern coast of the Bohai Sea,the coast of the Yellow Sea,and the southern coast area.The typical distance between the station with TRP and the TC center ranges from 1500 to 2500 km.Most of these stations are situated north to 60°west of north of the TC.The south–west water vapor transportation on the west side of the TC is crucial to TRP.TRP has a decreasing trend because of the decrease in the number of TCs that generate TRP.From the perspective of large-scale environmental conditions,a decrease in the integrated horizontal water vapor transport in China' Mainland,the weakening of upward motion at approximately 25°–35°N,which is inconducive to convection,and an increase in low-level vertical wind shear,which is unfavorable for the development of TC in areas with high frequencies of TRP-related TCs,are the factors that result in the decreasing trend of TRP.
