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Titel |
Recent trends in daily temperature extremes over northeastern Spain (1960–2006) |
VerfasserIn |
A. Kenawy, J. I. López-Moreno, S. M. Vicente-Serrano |
Medientyp |
Artikel
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Sprache |
Englisch
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ISSN |
1561-8633
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Digitales Dokument |
URL |
Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 9 ; Nr. 11, no. 9 (2011-09-27), S.2583-2603 |
Datensatznummer |
250009680
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Publikation (Nr.) |
copernicus.org/nhess-11-2583-2011.pdf |
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Zusammenfassung |
Spatial and temporal characteristics of extreme temperature events in
northeastern Spain have been investigated. The analysis is based on long-term,
high-quality, and homogenous daily maximum and minimum temperature of 128
observatories spanning the period from 1960 to 2006. A total of 21 indices
were used to assess changes in both the cold and hot tails of the daily
temperature distributions. The presence of trends in temperature extremes
was assessed by means of the Mann-Kendall test. However, the autocorrelation
function (ACF) and a bootstrap methodology were used to account for the
influence of serial correlation and cross-correlation on the trend
assessment. In general, the observed changes are more prevalent in hot
extremes than in cold extremes. This finding can largely be linked to the
increase found in the mean maximum temperature during the last few decades.
The results indicate a significant increase in the frequency and intensity
of most of the hot temperature extremes. An increase in warm nights (TN90p:
3.3 days decade−1), warm days (TX90p: 2.7 days decade−1), tropical nights (TR20:
0.6 days decade−1) and the annual high maximum temperature (TXx:
0.27 °C decade−1) was detected in the 47-yr period. In contrast, most of
the indices related to cold temperature extremes (e.g. cold days (TX10p),
cold nights (TN10p), very cold days (TN1p), and frost days (FD0))
demonstrated a decreasing but statistically insignificant trend. Although
there is no evidence of a long-term trend in cold extremes, significant
interdecadal variations were noted. Almost no significant trends in
temperature variability indices (e.g. diurnal temperature range (DTR) and
growing season length (GSL)) are detected. Spatially, the coastal areas
along the Mediterranean Sea and the Cantabrian Sea experienced stronger
warming compared with mainland areas. Given that only few earlier studies
analyzed observed changes in temperature extremes at fine spatial resolution
across the Iberian Peninsula, the results of this work can improve our
understanding of climatology of temperature extremes. Also, these findings
can have different hydrological, ecological and agricultural implications
(e.g. crop yields, energy consumption, land use planning and water resources
management). |
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