Semestral Journal of Centro Argentino de Meteorólogos, which is published  since 1970 and serves on the Core of Argentine Scientific Journals since 2005. Meteorologica publishes original papers in the field of atmospheric sciences and oceanography.

Registration number of intellectual property: RL-2018-42420861-APN-DNDA#MJ

ISSN 1850-468X

Volume 41 – N° 1 MORE NOTES FROM THIS ISSUE

MONTHLY TOTAL AMOUNT OF CONVECTIVE AND STRATIFORM RAINFALL IN BUENOS AIRES: A MORE PRECISE APPROACH TO ITS DISCRIMINATION

Rubén Horacio Sarochar

Facultad de Ciencias Astronómicas y Geofísicas – Universidad Nacional de La Plata

Manuscript received on 6th September 2015, in final form on 3rd November 2015

ABSTRACT

The present work analyzes the monthly precipitation data at Buenos Aires Station – Central Observatory Station. The hypothesis is that rainfall is compound by two classes of contributions: precipitation coming from convective cloudiness on the one hand and non-showery or stratus clouds on the other. Occasionally they can be together, and others one of them can appear alone. The main objective is to separate these two different rainfall classes of the rainfall using the hourly rainfall information obtained from pluviograph registers and the hourly present time reports, corresponding to January 2002 – December 2012 by the mentioned station. In order to establish the category “convective precipitation amount”, the hourly present time records asociated with convective phenomena (according to SYNOP code) was estracted from the hourly present time data. The hourly rainfall was determined by direct reading of the pluviographic bands. Then, the hourly present time reports were linked with the days and the hours of the rainfall data. That way when one given hour had rainfall record and had a convective hourly time present report too, this accumulated hourly rainfall was classified as convective precipitation. Therefore, the remaining rainfall reports were classified as stratiform precipitation. Hence, the analysis shows a bigger contribution to the convective precipitation from the month of October to March, which has a bigger variability.