Relationship between values and trends of two circulation indices and temperature and rainfall in Argentina

Extreme values of two circulation indices are examined for the time series covering the period 1960-2006. The influence of circulation on surface temperature and rainfall in Argentina is analysed using a zonal index Z and a meridional index R at the 1000 and 500 hPa levels. Seasonal means for all th...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autor principal: Alessandro, Adelia Perla
Publicado: 2012
Materias:
Circulation
Indices
Precipitation
Temperature
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13504827_v19_n4_p427_Alessandro
http://hdl.handle.net/20.500.12110/paper_13504827_v19_n4_p427_Alessandro
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_13504827_v19_n4_p427_Alessandro
record_format dspace
spelling paper:paper_13504827_v19_n4_p427_Alessandro2023-06-08T16:10:52Z Relationship between values and trends of two circulation indices and temperature and rainfall in Argentina Alessandro, Adelia Perla Circulation Indices Precipitation Temperature Extreme values of two circulation indices are examined for the time series covering the period 1960-2006. The influence of circulation on surface temperature and rainfall in Argentina is analysed using a zonal index Z and a meridional index R at the 1000 and 500 hPa levels. Seasonal means for all the years representing extreme negative values of R(Z) at 1000 and/or 500 hPa, determine mainly positive (negative) temperature anomalies with increased rainfall in both indices. These characteristics revert for extreme positive values of R(Z). At 1000 hPa, seasonal anomaly trends of R are negative and significant. Trends of Z are all positive and significant, except for winter when they are not significant. Signs of trends at 500 hPa are the same as at 1000 hPa, except for Z in winter and R in summer, whose values are not significant. Annual and seasonal trends of the anomalies of Z differences between 500 and 1000 hPa, are mostly negative, which implies a decrease in baroclinicity in southernmost South America. Analysis of the statistical values obtained for both variables generated by extreme values of R and Z, and of the signs and significance of index trends at 1000 hPa indicates that both circulation indices might contribute to surface temperature warming during the last years of the period 1960/2006. The increase in R, whose influence is greater than that of Z, might contribute to greater rainfall. © 2011 Royal Meteorological Society. Fil:Alessandro, A.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13504827_v19_n4_p427_Alessandro http://hdl.handle.net/20.500.12110/paper_13504827_v19_n4_p427_Alessandro
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Circulation
Indices
Precipitation
Temperature
spellingShingle Circulation
Indices
Precipitation
Temperature
Alessandro, Adelia Perla
Relationship between values and trends of two circulation indices and temperature and rainfall in Argentina
topic_facet Circulation
Indices
Precipitation
Temperature
description Extreme values of two circulation indices are examined for the time series covering the period 1960-2006. The influence of circulation on surface temperature and rainfall in Argentina is analysed using a zonal index Z and a meridional index R at the 1000 and 500 hPa levels. Seasonal means for all the years representing extreme negative values of R(Z) at 1000 and/or 500 hPa, determine mainly positive (negative) temperature anomalies with increased rainfall in both indices. These characteristics revert for extreme positive values of R(Z). At 1000 hPa, seasonal anomaly trends of R are negative and significant. Trends of Z are all positive and significant, except for winter when they are not significant. Signs of trends at 500 hPa are the same as at 1000 hPa, except for Z in winter and R in summer, whose values are not significant. Annual and seasonal trends of the anomalies of Z differences between 500 and 1000 hPa, are mostly negative, which implies a decrease in baroclinicity in southernmost South America. Analysis of the statistical values obtained for both variables generated by extreme values of R and Z, and of the signs and significance of index trends at 1000 hPa indicates that both circulation indices might contribute to surface temperature warming during the last years of the period 1960/2006. The increase in R, whose influence is greater than that of Z, might contribute to greater rainfall. © 2011 Royal Meteorological Society.
author Alessandro, Adelia Perla
author_facet Alessandro, Adelia Perla
author_sort Alessandro, Adelia Perla
title Relationship between values and trends of two circulation indices and temperature and rainfall in Argentina
title_short Relationship between values and trends of two circulation indices and temperature and rainfall in Argentina
title_full Relationship between values and trends of two circulation indices and temperature and rainfall in Argentina
title_fullStr Relationship between values and trends of two circulation indices and temperature and rainfall in Argentina
title_full_unstemmed Relationship between values and trends of two circulation indices and temperature and rainfall in Argentina
title_sort relationship between values and trends of two circulation indices and temperature and rainfall in argentina
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13504827_v19_n4_p427_Alessandro
http://hdl.handle.net/20.500.12110/paper_13504827_v19_n4_p427_Alessandro
work_keys_str_mv AT alessandroadeliaperla relationshipbetweenvaluesandtrendsoftwocirculationindicesandtemperatureandrainfallinargentina
_version_ 1768541810998640640

Ejemplares similares