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A. El Kenawy  - - - 
Top co-authors See all
Juan I. López-Moreno

22 shared publications

Instituto Pirenaico de Ecología, Spanish National Research Council (CSIC)

Marta Angulo-Martínez

16 shared publications

Estación Experimental de Aula Dei, Spanish National Research Council (CSIC)

Martin BENISTON

14 shared publications

University of Geneva

Cesar Azorin-Molina

9 shared publications

Instituto Pirenaico de Ecología, Spanish National Research Council (CSIC)

Jorge Lorenzo-Lacruz

4 shared publications

Instituto Pirenaico de Ecología, Spanish National Research Council (CSIC)

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Distribution of Articles published per year 

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Publications
Article 0 Reads 12 Citations An assessment of the role of homogenization protocol in the performance of daily temperature series and trends: applicat... A. El Kenawy, J. I. López-Moreno, P. Štěpánek, S. M. Vicente... Published: 21 November 2011
International Journal of Climatology, doi: 10.1002/joc.3410
DOI See at publisher website
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This paper gives the complete details of the protocols applied for developing a spatially and temporarily high‐resolution dataset of temperature for northeastern Spain. Our methodologies used data from a large number of observatories (1583) spanning some portions of the period between 1900 and 2006. The raw dataset was first tested for internal and external consistency to check data quality. To improve data completeness, a linear regression model was then utilized to infill gaps in the daily temperature series using the best correlated data from nearby sites. Discontinuities in the reconstructed series were determined by combining the results of three homogeneity‐relative tests: the Standard Normal Homogeneity Test (SNHT), the Eastrerling and Peterson two‐phased regression method and the Vincent test. To assess the possible impact of data homogenisation on trends and statistical properties of the final series, a set of tests (e.g. semivariance models and L‐moment statistics) was applied to the series before and after correction. Semivariance models suggest a significant improvement in the spatial dependence of the corrected dataset on both seasonal and annual timescales. Also, L‐moments gave no evidence of significant changes in the probability distribution of daily temperature series after correction. Taken together, the newly compiled dataset seems to be more robust and reveals more coherent spatial and temporal patterns of temperature compared with the original dataset. From the temporal and spatial perspectives, the new dataset comprises the most complete register of temperature in northeast Spain (1900–2006), with a reasonably spatial coverage. Accordingly, this database can provide a more reliable base for studying temperature changes and variability in the region. This dataset can also be of particular relevance to a number of meteorological, ecological, hydrological and agricultural applications on local, regional and continental scales. Copyright © 2011 Royal Meteorological Society
BOOK-CHAPTER 0 Reads 5 Citations The NAO Impact on Droughts in the Mediterranean Region Juan I. López-Moreno, Jorge Lorenzo-Lacruz, Ahmed El Kenawy,... Published: 01 January 2011
Advances in Global Change Research, doi: 10.1007/978-94-007-1372-7_3
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This chapter shows the influence of the North Atlantic Oscillation (NAO) on droughts in the entire Mediterranean region between 1901 and 2006. The analysis has been based on identification of positive and negative NAO winters and also detection of the anomalies of drought severity by means of the Standardized Precipitation Evapotranspiration Index (SPEI). The analysis is focussed on the winter NAO. Nevertheless, given that the SPEI drought indicator can be obtained at different time-scales, the study shows how the effects of the winter NAO on droughts are propagated for the following months when long time scales are considered. In general, during the positive phases, the negative SPEI averages are recorded in Southern Europe (the Iberian Peninsula, Italy and the Balkans), areas of Turkey and northwest Africa. On the contrary, the SPEI averages are found positive in northeast Africa. The opposite configuration, but with some differences in the spatial patterns and the magnitude of the SPEI averages, is found during the negative NAO years. The findings of this study should be of great applicability in terms of developing early warning systems. The established relationships between NAO phases and drought indices seem appropriate for drought prediction over large areas of the Mediterranean basin.
BOOK-CHAPTER 0 Reads 2 Citations Influence of Winter North Atlantic Oscillation Index (NAO) on Climate and Snow Accumulation in the Mediterranean Mountai... Juan I. López-Moreno, Enrique Morán-Tejeda, Jorge Lorenzo-La... Published: 01 January 2011
Advances in Global Change Research, doi: 10.1007/978-94-007-1372-7_6
DOI See at publisher website
Article 0 Reads 13 Citations Temperature trends in Libya over the second half of the 20th century Ahmed M. Kenawy, Juan I. López-Moreno, Mohammed S. Mekld, Ah... Published: 06 January 2009
Theoretical and Applied Climatology, doi: 10.1007/s00704-008-0089-2
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This paper investigates spatial variability of temperature trends over Libya in the second half of the 20th century. The study is based on complete and homogeneous time series of minimum, maximum, and mean temperature for ten observatories. During the investigated period (1951–1999), temperature trend analyses have experienced a downward trend in the maximum surface temperature (about –0.06°C decade–1) and an upward trend in the minimum surface temperature (about 0.23°C decade–1). Cooling tendency in maximum temperature is spatially more pronounced in inland stations compared to coastal stations. At the seasonal scale, maximum temperature cooling is more obvious in winter and spring, meanwhile minimum temperature warming is more pronounced in summer and fall. In accordance with global trends, the surface mean temperature has moderately risen at an average rate of 0.09°C decade–1. However, this trend has shown considerable temporal variability considering a more pronounced upward trend in summer and fall. In conjunction with other regional and global investigations, clear trends towards smaller diurnal range are presented (–0.28°C decade–1).