Association between Tucuman temperature anomaly and the solar cycle length

NIEVES ORTIZ DE ADLER; ANA G. ELIAS

Santiago de Chile

Congreso; 6th ICSHMO, International Conference on Southern Hemisphere Meteorology and Oceanography; 2000

AMS, American Meteorological Society

One of the longest time series records of temperature in Argentina has been used, covering the period 1889-1998. These data belong to San Miguel de Tucuman, which is located 26°S 65°W, and 481 m above sea level. In this work, Tucuman temperature anomaly (TTA), that is the deviation from the mean, has been considered. The solar cycle length (SCL) varies with solar activity in such a way that high activity implies short solar cycles while long solar cycles correspond to low activity levels. SCL is a parameter of a long-term variation which has a periodicity of approximately 88 years. In order to determine the association between TTA and SCL, the mean TTA value for each solar cycle has been estimated. A good agreement between SCL and TTA is observed. There is a close association between these curves even in the important decrease from 1945 to 1970, where it should be expected a temperature increase responding to an increase in greenhouse effect, due to anthropogenic reasons. Instead, TTA closely follows SCL variation in its downward trend.