Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/nhess-2016-330
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
11 Nov 2016
Review status
A revision of this discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
PREGRIDBAL 1.0: towards a high resolution rainfall atlas for the Balearic Islands (1950–2009)
Toni López Mayol1, Víctor Homar1, Climent Ramis1, and José Antonio Guijarro2 1Grup de Meteorologia. Departament de Física. Universitat de les Illes Balears. 07122 Palma (Mallorca)
2Delegació Territorial en Illes Balears. Agencia Estatal de Meteorologia. Moll de Porto Pí, s/n. 07015 Palma (Mallorca)
Abstract. This work presents a catalog of daily precipitation in the Balearic Islands created with data from AEMET assistant observers, including registers since 1912. The original digital daily data file has been interpolated onto a regular 100 m resolution grid (namely PREGRIDBAL), defined with the aim of becoming a valid standard for future methodological improvements and catalog upgrades. Daily precipitation amounts on each grid-point are calculated using an analysis method based on ordinary Kriging, using the daily anomaly with respect to the annual mean for all available observations each day. Due to quality concerns, the time span for products derived from the catalogue is limited to the 1950–2009 period. Therefore, from the elementary daily maps, monthly-, annual-, quinquennial-, and decadal-accumulations are produced. Similarly, the catalog allowed for quantification of climate trends in rainfall amounts in the Balearic Islands, with the significant advantage of minimising the biases originated from heterogeneities in the spatial distribution of stations across the archipelago.

Results show a general decrease in precipitation during the 1950–2009 period. From 1950 to 1979, the average annual precipitation across the islands was 624,3 mm, while from 1980 to 2009 diminished to 555,36 mm. Changes in precipitation patterns, which vary among the different areas, are also detected. Most significant reductions (over 80 % significance on the trend) are found in the north half of the archipelago and especially in Mallorca, where the Tramuntana mountain range stands out. All seasonal trends show a decrease, with values ranging between 1 and 3 mm per decade, with the exception of autumn, which reaches up to 7 mm per decade. October shows the most dramatic decrease (−10,34 mm per decade) and, conversely, September and November show an increase in precipitation (3,28 and 1,82 mm per decade, respectively) with a statistical significance above 85 % in almost all the archipelago, and even exceeding 95 % in the Pitiüses.


Citation: López Mayol, T., Homar, V., Ramis, C., and Guijarro, J. A.: PREGRIDBAL 1.0: towards a high resolution rainfall atlas for the Balearic Islands (1950–2009), Nat. Hazards Earth Syst. Sci. Discuss., doi:10.5194/nhess-2016-330, in review, 2016.
Toni López Mayol et al.
Toni López Mayol et al.
Toni López Mayol et al.

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Short summary
This paper presents a very high resolution atlas of daily precipitations across the Balearic Islands territory. The generation of this dataset allows not only to set the grounds for future updates ingesting a myriad of observation sources but also aims at providing support to local and network-topology independent studies of precipitation-senstive systems such as ecosystems, water resources and energy systems. As an example, a better understanding of the negative precipitation trends is found.
This paper presents a very high resolution atlas of daily precipitations across the Balearic...
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