THE MEASUREMENT AND ANALYSIS OF ICE-NUCLEUSCON CENTRATION AT PEKING DURING THE PERIOD FROM MARCH 18TH TO APRIL 30TH IN 1963

The concentration of ice-nuclei active at temperatures of -15°,-20°,-25°,-25℃ and -25℃ was measured with an mixing cloud chamber,during the period from March 18th to April 30th in 1963 at Peking.The average concentration and daily varitions at four temperatures of ice-nucleus concentration counts are given.The results are discussed with reference to the conditions of wind and pollution.