Open AccessMid‐troposphere variables and their association with daily local precipitation
Author(s) -
Ruiz N E,
Vargas W M,
Ciappesoni H H
Publication year - 1999
Publication title -
meteorological applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 59
eISSN - 1469-8080
pISSN - 1350-4827
DOI - 10.1017/s1350482799001279
Subject(s) - geostrophic wind , geopotential height , vorticity , climatology , anticyclone , geopotential , advection , precipitation , troposphere , environmental science , zonal and meridional , atmospheric sciences , potential vorticity , positive vorticity advection , geology , meteorology , geography , physics , vortex , thermodynamics
This paper describes the meteorological variables directly affecting precipitation in the southern region of South America. Results show the relationships between daily precipitation at Ezeiza, Buenos Aires, and 500 mb dynamic variables (e. g. geopotential heights, relative geostrophic vorticity and its advection, vorticity tendency and zonal and meridional geostrophic wind components) using regional synoptic analyses from the Servicio Meteorológico Nacional of Argentina for 1986. The distribution of significant biserial correlation coefficients reveals the preferred positions for the anomalous wind components which favour the occurrence of rainfall at Ezeiza. In the same way, spatial distributions and temporal lag relations of 500 mb relative vorticity anomalies in relation to precipitation show the positions and relative movement of centres of anomalously cyclonic and anticyclonic vorticity which increase the probability of precipitation at Buenos Aires. Vorticity advection does not yield higher correlations, at least in a daily temporal scale. The geographical distribution of temporal means and standard deviations of geopotential heights and zonal and meridional wind components at the 500 mb level are also shown. Copyright © 1999 Royal Meteorological Society