The environmental impact of aerosols is currently a hot issue that has received worldwide attention. Lacking simultaneous observations of aerosols and carbon flux, the understanding of the aerosol radiative effect of ...The environmental impact of aerosols is currently a hot issue that has received worldwide attention. Lacking simultaneous observations of aerosols and carbon flux, the understanding of the aerosol radiative effect of urban agglomeration on the net ecosystem carbon exchange(NEE) is restricted. In 2009-2010, an observation of the aerosol optical property and CO_(2) flux was carried out at the Dongguan Meteorological Bureau Station(DMBS) using a sun photometer and eddy covariance systems. The different components of photosynthetically active radiation(PAR),including global PAR(GPAR), direct PAR(DPAR), and scattered PAR(FPAR), were calculated using the Santa Barbara DISORT Atmospheric Radiative Transfer(SBDART) model. The effects of PAR on the NEE between land-atmosphere systems were investigated. The results demonstrated that during the study period the aerosol optical depth(AOD)reduced the DPAR by 519.28±232.89 μmol photons · m^(-2)s^(-1), but increased the FPAR by 324.93±169.85μmol photons ·m^(-2)s^(-1),ultimately leading to 194.34±92.62 μmol photons · m^(-2)s^(-1);decrease in the GPAR. All the PARs(including GPAR,DPAR, and FPAR) resulted in increases in the NEE(improved carbon absorption), but the FPAR has the strongest effect with the light use efficiency(LUE) being 1.12 times the values for the DPAR. The absorption of DPAR by the vegetation exhibited photo-inhibition in the radiation intensity > 600 photons · m^(-2)s^(-1);in contrast, the absorptions of FPAR did not exhibit apparent photo-inhibition. Compared with the FPAR caused by aerosols, the DPAR was not the primary factor affecting the NEE. On the contrary, the increase in AOD significantly increased the FPAR, enhancing the LUE of vegetation ecosystems and finally promoting the photosynthetic CO_(2) absorption.展开更多
Background The intravascular ultrasound(IVUS)-guided percutaneous coronary intervention(PCI)can benefit the treatment of coronary artery disease(CAD).However,the beneficial effect of IVUS-guided PCI in patients with a...Background The intravascular ultrasound(IVUS)-guided percutaneous coronary intervention(PCI)can benefit the treatment of coronary artery disease(CAD).However,the beneficial effect of IVUS-guided PCI in patients with acute myocardial infarction(AMI)remains controversial.Methods A total of 537 AMI patients were included in this study,divided into two groups:the angiography-guided group(n=289)and the IVUS-guided group(n=248)according to whether the IVUS was applied.The primary outcome was a composite of major adverse cardiovascular events(MACEs),including cardiovascular death,recurrent myocardial infarction(MI),and target lesion revascularization(TLR).The secondary outcome was procedural radiation exposure time.Results The IVUS-guided group was associated with a reduced incidence of MACEs(12.8%vs.8.5%,P=0.032).The results were consistent after adjusting for confounders in the multivariable Cox analysis,which showed that the absence of IVUS(HR 1.194,95%CI 1.061-1.323,P=0.011)was an independent predictor of MACEs.Additionally,the IVUS-guided group experienced significantly lower float time(893.3±265.2 min vs.623.2±137.3 min,P<0.001).Conclusions The use of IVUS was associated with better long-term cardiovascular outcomes.The use of IVUS in PCI should be considered for patients with AMI to optimize procedural outcomes and enhance long-term prognosis.展开更多
基金National Key R&D Program of China(2019YFC0214605)Key-Area R&D Program of Guangdong Province (2020B1111360003)+4 种基金Provincial Natural Science Foundation of Guangdong (2021A1515011494)Science and Technology Innovation Team Plan of Guangdong Meteorological Bureau (GRMCTD202003)Open Project of the Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology (KDW 1803)Scientific and Technological Innovation Team Project of Guangzhou Joint Research Center of Atmospheric Sciences,China Meteorological Administration (201704)Science and Technology Research Project of Guangdong Meteorological Bureau (GRMC2018M01)。
文摘The environmental impact of aerosols is currently a hot issue that has received worldwide attention. Lacking simultaneous observations of aerosols and carbon flux, the understanding of the aerosol radiative effect of urban agglomeration on the net ecosystem carbon exchange(NEE) is restricted. In 2009-2010, an observation of the aerosol optical property and CO_(2) flux was carried out at the Dongguan Meteorological Bureau Station(DMBS) using a sun photometer and eddy covariance systems. The different components of photosynthetically active radiation(PAR),including global PAR(GPAR), direct PAR(DPAR), and scattered PAR(FPAR), were calculated using the Santa Barbara DISORT Atmospheric Radiative Transfer(SBDART) model. The effects of PAR on the NEE between land-atmosphere systems were investigated. The results demonstrated that during the study period the aerosol optical depth(AOD)reduced the DPAR by 519.28±232.89 μmol photons · m^(-2)s^(-1), but increased the FPAR by 324.93±169.85μmol photons ·m^(-2)s^(-1),ultimately leading to 194.34±92.62 μmol photons · m^(-2)s^(-1);decrease in the GPAR. All the PARs(including GPAR,DPAR, and FPAR) resulted in increases in the NEE(improved carbon absorption), but the FPAR has the strongest effect with the light use efficiency(LUE) being 1.12 times the values for the DPAR. The absorption of DPAR by the vegetation exhibited photo-inhibition in the radiation intensity > 600 photons · m^(-2)s^(-1);in contrast, the absorptions of FPAR did not exhibit apparent photo-inhibition. Compared with the FPAR caused by aerosols, the DPAR was not the primary factor affecting the NEE. On the contrary, the increase in AOD significantly increased the FPAR, enhancing the LUE of vegetation ecosystems and finally promoting the photosynthetic CO_(2) absorption.
基金supported by the Zhaoqing City Science and Technology Innovation Guidance Project(No.2023010309025)。
文摘Background The intravascular ultrasound(IVUS)-guided percutaneous coronary intervention(PCI)can benefit the treatment of coronary artery disease(CAD).However,the beneficial effect of IVUS-guided PCI in patients with acute myocardial infarction(AMI)remains controversial.Methods A total of 537 AMI patients were included in this study,divided into two groups:the angiography-guided group(n=289)and the IVUS-guided group(n=248)according to whether the IVUS was applied.The primary outcome was a composite of major adverse cardiovascular events(MACEs),including cardiovascular death,recurrent myocardial infarction(MI),and target lesion revascularization(TLR).The secondary outcome was procedural radiation exposure time.Results The IVUS-guided group was associated with a reduced incidence of MACEs(12.8%vs.8.5%,P=0.032).The results were consistent after adjusting for confounders in the multivariable Cox analysis,which showed that the absence of IVUS(HR 1.194,95%CI 1.061-1.323,P=0.011)was an independent predictor of MACEs.Additionally,the IVUS-guided group experienced significantly lower float time(893.3±265.2 min vs.623.2±137.3 min,P<0.001).Conclusions The use of IVUS was associated with better long-term cardiovascular outcomes.The use of IVUS in PCI should be considered for patients with AMI to optimize procedural outcomes and enhance long-term prognosis.
