Trend analysis of multidecadal datasets of air and sea surface temperatures within the southeastern bay of Biscay.
- Almudena Fontán
- Angel Borja
- Andrea del Campo
- Ganix Esnaola
- Luis Ferrer
- Nerea Goikoetxea Bilbao
- Julien Mader
- Adolfo Uriarte
- González, Manuel
- Fontán Gómez, Almudena
- Borja Yerro, Ángel
- Esnaola Aldanondo, Ganix
ISSN: 0212-5919
Año de publicación: 2010
Volumen: 26
Número: 2
Páginas: 23-31
Tipo: Artículo
Otras publicaciones en: Thalassas: An international journal of marine sciences
Resumen
The results of the trend analysis of air and sea surface temperatures measured in Donostia-San Sebastián, southeastern Bay of Biscay, are described within this contribution. The air temperature data series belongs to the Meteorological Observatory of Igeldo (AEMET) (43° 18’ N, 02° 02’ W; at 252 m above the mean sea level). The time series extends from 1928 to 2008, representing 81 years of daily maximum and minimum air temperatures. The sea surface temperature (SST) dataset, measured in a nearly daily basis at 10 a.m. at the Aquarium of Donostia-San Sebastian (43° 19’ N, 02° 00’ W), extends from 1947 to 2008; representing 62 years of data. In order to remove fluctuations due to time-scales of less than a year (such as seasonal variability), an annual moving average has been calculated. Subsequently, a trend analysis has been performed with the annual air and sea surface temperature data, by linear regression fitting and by minimising absolute deviation. Globally, a slightly decreasing trend (-0.003 °C·year-1) can be observed, for the whole of the SST time series (1947-2008). In contrast, a warming trend of 0.008 and 0.011 °C·year-1 is detected for the minimum and maximum air temperature series (1928-2008), respectively. However, the analysis of both time series, in a decadal basis, shows a remarkable warming trend since the mid 1980s. Such increase is of 0.019 and 0.026 °C·year-1 for the annual averaged minimum and maximum air temperatures; whilst it is of 0.019 °C·year-1, for the annual averaged SST.