INVESTIGADORES
AVILA Eldo Edgardo
congresos y reuniones científicas
Título:
Relation between natural deposition ice nuclei concentration and precipitation at an urban site
Autor/es:
LOPEZ M.L.; AVILA E. E.
Lugar:
Praga
Reunión:
Conferencia; 26th IUGG General Assembly of the International Union of Geodesy and Geophysics; 2015
Resumen:
Ice nucleation in the atmosphere is of practical and fundamental importance since ice crystals influence the release of snow, rain and hail. Some aerosols serve to nucleate ice in clouds. They are called ice nuclei (IN) and they are generally solid particles, insoluble in water. Temperature (T) and the supersaturation ratio with respect to ice (SS) are the two main parameters which determine ice nucleation. In this work we use an experimental device designed to measure the concentration of natural deposition ice nuclei under controlled T and SS [1]. Ice nuclei concentrations were measured in a cloud chamber placed in a cold room. The measurements were performed in an urban site at Cordoba City during a time period between July and December 2014, at a temperature around -25 C and SS around 15%. It was observed that IN concentrations were enhanced during rain events, with concentrations increasing by a factor of 10 or even more during rain in good agreement with results previously reported by other authors [2]. The results show that variations in the number of deposition ice nuclei are correlated with changes in the relative humidity (RH) of the air injected into the cloud chamber used in the experiments. A fitting function which depends on RH is proposed to parameterize the results obtained in the present work.