Based on the China Meteorological Administration’s Tropical Regional Atmosphere Model for the South China Sea(CMA-TRAMS),the authors conducted a collaborative assimilation forecasting experiment utilizing both Beidou...Based on the China Meteorological Administration’s Tropical Regional Atmosphere Model for the South China Sea(CMA-TRAMS),the authors conducted a collaborative assimilation forecasting experiment utilizing both Beidou radiosonde and drone-dropped(HAIYAN-I)radiosonde data in September 2023.Three assimilation experimental groups were designed as follows:Beidou radiosonde assimilation,drone-dropped radiosonde assimilation,and collaborative assimilation of Beidou and drone-dropped radiosonde data(hereinafter referred to as“Beidoudrop”).Additionally,a control group of operational forecasts without these data assimilations was set up.The results indicate that the operational forecast path in the control group deviated northward from the actual path.Besides,the Beidou-drop group showed the most significant improvement in terms of forecasting the typhoon path at 60 to 90 h lead times.Specifically,the 72 h and 90 h path errors were reduced by 66.8 and 82.4 km,respectively,resulting in a much more accurate forecast of Typhoon Haikui’s landing point,at the coastal junction of Fujian and Guangdong.Furthermore,the collaborative assimilation revealed a notable impact on improving the forecast of wind and rain associated with Haikui’s landfall,aligning more closely with the real case.A marked rise was also seen in the precipitation score of the Beidou-drop group,where the 50 mm TS(threat score)of the 72 h lead time increased from 0.33 in the control experiment to 0.75,and the 100 mm TS rose from 0.18 to 0.39.展开更多
Highly efficient isomerization of glucose to fructose is essential for valorizing cellulose fraction of biomass to valueadded chemicals.This work provided an innovative method for preparing Mg-biochar and Mg-K-biochar...Highly efficient isomerization of glucose to fructose is essential for valorizing cellulose fraction of biomass to valueadded chemicals.This work provided an innovative method for preparing Mg-biochar and Mg-K-biochar catalysts by impregnating either MgCl_(2) alone or in combination with different K compounds(Ding et al.in Bioresour Technol 341:125835,2021,https://doi.org/10.1016/j.biort ech.2021.125835 and KHCO_(3))on cellulose-derived biochar,followed by hydrothermal carbonization and pyrolysis.Single active substance MgO existing in the _(10)Mg-C could give better catalytic effect on glucose isomerization than the synergy of MgO and KCl crystalline material present in _(10)Mg-KCl-C.But the catalytic effect of _(10)Mg-C was decreased when the basic site of MgO was overloaded.Compared to other carbon-based metal catalysts,_(10)Mg-KHCO_(3)-C with 10 wt%MgCl_(2) loading had excellent catalytic performance,which gave a higher fructose yield(36.7%)and selectivity(74.54%),and catalyzed excellent glucose conversion(53.99%)at 100℃ in 30 min.Scanning electron microscope-energy dispersive spectrometer and X-Ray diffraction revealed that the distribution of Mg^(Mg^(2+))and K^(+)in _(10)Mg-KHCO_(3)-C was uniform and the catalytic active substances(MgO,KCl and K_(2)CO_(3))were more than _(10)Mg-C(only MgO).The synergy effects of MgO and K_(2)CO_(3) active sites enhanced the pH of reaction system and induced H2O ionization to form considerable OH−ions,thus easily realizing a deprotonation of glucose and effectively catalyzing the isomerization of glucose.In this study,we developed a highly efficient Mg-K-biochar bimetallic catalyst for glucose isomerization and provided an efficient method for cellulose valorization.展开更多
文摘Based on the China Meteorological Administration’s Tropical Regional Atmosphere Model for the South China Sea(CMA-TRAMS),the authors conducted a collaborative assimilation forecasting experiment utilizing both Beidou radiosonde and drone-dropped(HAIYAN-I)radiosonde data in September 2023.Three assimilation experimental groups were designed as follows:Beidou radiosonde assimilation,drone-dropped radiosonde assimilation,and collaborative assimilation of Beidou and drone-dropped radiosonde data(hereinafter referred to as“Beidoudrop”).Additionally,a control group of operational forecasts without these data assimilations was set up.The results indicate that the operational forecast path in the control group deviated northward from the actual path.Besides,the Beidou-drop group showed the most significant improvement in terms of forecasting the typhoon path at 60 to 90 h lead times.Specifically,the 72 h and 90 h path errors were reduced by 66.8 and 82.4 km,respectively,resulting in a much more accurate forecast of Typhoon Haikui’s landing point,at the coastal junction of Fujian and Guangdong.Furthermore,the collaborative assimilation revealed a notable impact on improving the forecast of wind and rain associated with Haikui’s landfall,aligning more closely with the real case.A marked rise was also seen in the precipitation score of the Beidou-drop group,where the 50 mm TS(threat score)of the 72 h lead time increased from 0.33 in the control experiment to 0.75,and the 100 mm TS rose from 0.18 to 0.39.
基金National Natural Science Foundation of China(Grant No.22268007)Natural Science Foundation of Guangxi Province,China(Grant No.2021GXNSFDA196006)+3 种基金Guangxi Science and Technology Major Pro-gram(Guike AA22117013)National Key Research and Development Program of China(Grant No.2021YFE0114400)Innovation Project of Guangxi Graduate Education(Grant No.YCBZ2023020)Foundation of Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control,College of Light Industry and Food Engineering,Guangxi University(Grant No.2021KF20).AJR efforts were supported University of Tennessee,Knoxville.
文摘Highly efficient isomerization of glucose to fructose is essential for valorizing cellulose fraction of biomass to valueadded chemicals.This work provided an innovative method for preparing Mg-biochar and Mg-K-biochar catalysts by impregnating either MgCl_(2) alone or in combination with different K compounds(Ding et al.in Bioresour Technol 341:125835,2021,https://doi.org/10.1016/j.biort ech.2021.125835 and KHCO_(3))on cellulose-derived biochar,followed by hydrothermal carbonization and pyrolysis.Single active substance MgO existing in the _(10)Mg-C could give better catalytic effect on glucose isomerization than the synergy of MgO and KCl crystalline material present in _(10)Mg-KCl-C.But the catalytic effect of _(10)Mg-C was decreased when the basic site of MgO was overloaded.Compared to other carbon-based metal catalysts,_(10)Mg-KHCO_(3)-C with 10 wt%MgCl_(2) loading had excellent catalytic performance,which gave a higher fructose yield(36.7%)and selectivity(74.54%),and catalyzed excellent glucose conversion(53.99%)at 100℃ in 30 min.Scanning electron microscope-energy dispersive spectrometer and X-Ray diffraction revealed that the distribution of Mg^(Mg^(2+))and K^(+)in _(10)Mg-KHCO_(3)-C was uniform and the catalytic active substances(MgO,KCl and K_(2)CO_(3))were more than _(10)Mg-C(only MgO).The synergy effects of MgO and K_(2)CO_(3) active sites enhanced the pH of reaction system and induced H2O ionization to form considerable OH−ions,thus easily realizing a deprotonation of glucose and effectively catalyzing the isomerization of glucose.In this study,we developed a highly efficient Mg-K-biochar bimetallic catalyst for glucose isomerization and provided an efficient method for cellulose valorization.
