Latitudinal positioning of the subtropical anticyclone along the Chilean coast
| Autor: | Consejo Nacional de Ciencia, Walter M. Vargas, Juan Leonidas Minetti, Arnobio Germán Poblete, Eduardo A. Mendoza |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Australian Meteorological and Oceanographic Journal. 58:107-117 |
| ISSN: | 1836-716X 1901-2004 |
| DOI: | 10.22499/2.5802.003 |
| Popis: | In the past various authors have investigated climatic change (CC) by using the latitude of the subtropical ridge in the mean sea-level pressure (MSLP) for a range of geographic regions. In this paper the index L is defined as the latitudinal position of the subtropical anticyclone along the Chilean coast. This L index on the South American coast of the South Pacific is analysed using an instrumental record, covering the 1901-2004 period. An objective methodology is proposed for estimating L, and the physical consistency is assessed with the SOI and pressure at sea level in Valdivia, Chile. The analysis of a shorter period is compared with other authors’ results. The L variable can be useful in CC studies or in the analysis of low-frequency fluctuations in climate variability, and it is analysed as a dependent and independent time series. L was displaced towards the south over the last century but not to a statistically significant extent. Natural fluctuations of 50 years and another, shorter, of 16-22 years were also observed. In this paper, the greatest persistence and distant associations between anomalies of monthly L are shown; these associations can be useful for climate forecasting. |
| Databáze: | OpenAIRE |
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