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| Titel |
Investigating uncertainties in global gridded datasets of climate extremes |
| VerfasserIn |
R. J. H. Dunn, M. G. Donat, L. V. Alexander |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 6 ; Nr. 10, no. 6 (2014-12-12), S.2171-2199 |
| Datensatznummer |
250117085
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| Publikation (Nr.) |
 copernicus.org/cp-10-2171-2014.pdf |
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| Zusammenfassung |
| We assess the effects of different methodological choices made during the
construction of gridded data sets of climate extremes, focusing primarily on
HadEX2. Using global land-surface time series of the indices and their
coverage, as well as uncertainty maps, we show that the choices which have
the greatest effect are those relating to the station network used or that
drastically change the values for individual grid boxes. The latter are most
affected by the number of stations required in or around a grid box and the
gridding method used. Most parametric changes have a small impact, on global
and on grid box scales, whereas structural changes to the methods or input
station networks may have large effects. On grid box scales, trends in
temperature indices are very robust to most choices, especially in areas
which have high station density (e.g. North America, Europe and Asia). The
precipitation indices, being less spatially correlated, can be more
susceptible to methodological choices, but coherent changes are still clear
in regions of high station density. Regional trends from all indices derived
from areas with few stations should be treated with care. On a global scale,
the linear trends over 1951–2010 from almost all choices fall within the
5–95th percentile range of trends from HadEX2. This demonstrates the robust
nature of HadEX2 and related data sets to choices in the creation method. |
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