The spatial organization of daily rainfall over Mallorca, Spain

Abstract

Daily rainfall affinity areas are derived for the island of Mallorca using four years of data, and a 9 6 x 9 6 intersite correlation matrix. An initial visual impression of the nature of rainfall organization is afforded by the mapping of correlation links between sites. The Serra de Tramontana form a climatological as well as topographic barrier, producing a marked alignment in spatial rainfall occurrence in that part of the island. Elsewhere 'core' sites are identified, about which rainfall correlation is high for distances of up to 15 km. These centre on higher elevation locations in the Serra de Llevant and in the central area, and also the Palma and Campos coastal embayments. Use of rotated principal components and cluster analyses applied to the correlation matrices permits the division of the island into seven major rainfall areas. The uplands of the north-west and east of the island provide clear units in terms of both exposure and altitude, and their general exposure to prevailing rain-bearing winds appears important, whilst an urban effect due to Palma and clear sea-breeze convergence effects near the centre of the island are also implied.

Respuesta hidro-sedimentaria en dos cuencas mediterráneas representativas afectadas por el cambio global

“…Las dos áreas de estudio presentan marcadas diferencias en sus características climatológi-cas debido a su ubicación en distintas áreas de afinidad de precipitación diaria en la isla de Mallorca (Sumner et al, 1993), condicionadas básicamente por los efectos del relieve. De esta manera, aplicando el método de Emberger (Guijarro, 1986), el clima de Sa Font de la Vila se clasifica como mediterráneo templado sub-húmedo en la zona de cabecera y mediterráneo cálido subhúmedo en la parte baja.…”

Variation in leaf longevity of Pistacia lentiscus and its relationship to sex and drought stress inferred from leaf δ13C

“…The sampling took place between 14 and 27 November 1994 within nine sites in geographical areas with known differences in annual precipitation on Mallorca (Sumner, Ramis & Guijarro 1993), ranging from more than 1000 mm in the mountains along the windward north-west coast to about 350 mm at the southern coast (Table 1, Fig. 1).…”

Evaluation of extreme precipitation indices using daily records (1910–2000) from India

“…in precipitation is Principal Components Analysis (PCA) applied in several previous studies across different parts of the world, including Hastenrath andRosen (1983), Drosdowsky, (1993) and Sumner et al (1993). PCA is used to compress variance, reduce redundancy, and identify information content in a dataset.…”