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| Titel |
Pairwise homogeneity assessment of HadISD |
| VerfasserIn |
R. J. H. Dunn, K. M. Willett, C. P. Morice, D. E. Parker |
| 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. 4 ; Nr. 10, no. 4 (2014-08-20), S.1501-1522 |
| Datensatznummer |
250117025
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| Publikation (Nr.) |
 copernicus.org/cp-10-1501-2014.pdf |
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| Zusammenfassung |
| We report on preliminary steps in the homogenisation of HadISD, a
sub-daily, station-based data set covering 1973–2013. Using
temperature, dew point temperature, sea-level pressure and wind speeds,
change points are detected using the Pairwise Homogenisation
Algorithm from Menne and Williams Jr. (2009). Monthly-mean values and monthly-mean diurnal
ranges (temperature and dew point temperature) or monthly-maximum
values (wind speeds) are processed using the full network
of 6103 stations in HadISD. Where multiple change points are detected
within 1 year, they are combined and the average date is used. Under the assumption that the underlying
true population of inhomogeneity magnitudes is Gaussian, inhomogeneity
magnitudes as small as around
0.5 °C, 0.5 hPa or 0.5 m s−1 have been successfully detected. The change point dates and
inhomogeneity magnitudes for each of the calculation methods will be provided
alongside the data set to allow users to select stations which have
different levels of homogeneity. We give an example application of
this change point information in calculating global temperature values
from HadISD and comparing these to CRUTEM4. Removing the most
inhomogeneous stations results in a better match between HadISD and
CRUTEM4 when matched to the same coverage. However, further removals
of stations with smaller and fewer inhomogeneities worsen the match. |
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