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Seasonal influence of the north Atlantic atmospheric circulation patterns over Iberian lakes

AuthorsHernández, Armand ; Trigo, Ricardo M.; Pla-Rabes, S.; Valero-Garcés, Blas L. ; Jerez, S.; Rico-Herrero, M.; Vega, J. C.; Jambrina-Enríquez, Margarita; Giralt, Santiago
KeywordsIberian Peninsula
North Atlantic
atmospheric circulation patterns
Issue Date11-Mar-2015
CitationInternational Symposium CLIMATE-ES 2015 , Tortosa, Tarragona, Spain, 11-13 March 2015.
AbstractA large fraction of the Iberian Peninsula climate is controlled by the North Atlantic Oscillation (NAO) circulation pattern. However, besides the NAO mode, the East Atlantic (EA) and Scandinavian (SCAND) patterns also play significant roles. The conjunction of these atmospheric circulation patterns (ACPs) exerts a strong effect on air temperatures, precipitation and wind patterns over the south-western Europe during the boreal winter, but the effects of these ACPs are not restricted to the winter. Summer conditions do not follow a simple pattern and, particularly in Mediterranean regions, other ACPs besides the NAO may better explain the climate variability. It is well-known that lake dynamics on the Iberian Peninsula is greatly controlled by climatic parameters, but the relationships between these various ACPs and lake dynamics have not yet been investigated in detail. We have analyzed seasonal averaged instrumental meteorological and limnological long term datasets from two lakes in northern and central Iberian Peninsula (Lakes Sanabria and Las Madres) to unveil the seasonal influence of the NAO, EA and SCAND circulation patterns over these freshwater systems. The limnological variability within Lakes Sanabria and Las Madres is primarily controlled by fluctuations in precipitation, wind and to lesser extent, by temperature. The primary ACPs associated with the winter limnological processes on Lake Sanabria are the NAO and the SCAND modes, whereas only the EA mode appears to weakly influence during the summer. In contrast, the ACPs influence on Lake Las Madres is less evident. The results obtained from both lakes indicate that the impact of the ACPs over the lake dynamics can be higher than that owing to single local meteorological variables. However, certain local features, such as the altitude, orientation, relief, lake morphology and anthropic influence, are crucial to properly record the signals of these ACPs.
Appears in Collections:(Geo3Bcn) Comunicaciones congresos
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