Characteristics of Haze Weather and Its Meteorological In-fluencing Factors in Hangzhou

Based on the observation data of the annual number of haze days,rainy days,fog days and gale days,sunshine hours,relative humidity and maximum wind speed at Hangzhou station from 1960 to 2021,the variation characteristics of haze days and meteorological influencing factors were studied by mathematical statistical methods such as Mann-Kendall nonparametric test,sliding T test,wavelet analysis and Pearson correlation two-tailed test.The results show that the annual number of haze days generally showed an upward trend,and the climate tendency rate was 20 d/a;there was a sudden change around 2001,and it changed from stable to rapid growth;the number of haze days was the largest in spring and winter,followed by autumn,while it was the smallest in summer.The annual number of haze days had a strongly significant period of 40 a and a mesoscale variation period of 13 a.The number of haze days was negatively correlated with the number of rainy days,fog days and gale days,sunshine hours,relative humidity and maximum wind speed,which passed the 0.05 significance test.In recent 60 years,the number of rainy days and gale days,relative humidity,and maximum wind speed in Hangzhou have decreased,resulting in the weakening of atmospheric wet deposition capacity and power transmission conditions,which provided favorable meteorological conditions for the increase of haze weather.

The structure of Crimean-Congo hemorrhagic fever virus Gc is revealed;many more still need an answer

Crimean-Congo hemorrhagic fever virus(CCHFV)is regarded as one of the most deadly viruses,with mortality of up to 40%.Currently,no licensed vaccine with validated efficacy against CCHFV is available.CCHFV uses Gn and Gc glycoproteins to bind and penetrate the cell,like other bunyaviruses(Hulswit et al.,2021).Thus,the desired vaccines are needed,to elicit a potent neutralizing antibody(NAb)response to counteract this process.