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Precipitation data in a mountainous catchment in Honduras: quality assessment and spatiotemporal characteristics

Författare och institution:
I Westerberg (-); Alexander Walther (Institutionen för geovetenskaper); J.-L. Guerrero (-); Z Coello (-); S. Halldin (-); C.-Y. Xu (-); Deliang Chen (Institutionen för geovetenskaper); L.-C. Lundin (-)
Publicerad i:
Theoretical and Applied Climatology, 101 ( 3-4 ) s. 381-396
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
An accurate description of temporal and spatial precipitation variability in Central America is important for local farming, water supply and flood management. Data quality problems and lack of consistent precipitation data impede hydrometeorological analysis in the 7,500 km2 Choluteca River basin in central Honduras, encompassing the capital Tegucigalpa. We used precipitation data from 60 daily and 13 monthly stations in 1913–2006 from five local authorities and NOAA's Global Historical Climatology Network. Quality control routines were developed to tackle the specific data quality problems. The quality-controlled data were characterised spatially and temporally, and compared with regional and larger-scale studies. Two gapfilling methods for daily data and three interpolation methods for monthly and mean annual precipitation were compared. The coefficient-of-correlation-weighting method provided the best results for gap-filling and the universal kriging method for spatial interpolation. In-homogeneity in the time series was the main quality problem, and 22% of the daily precipitation data were too poor to be used. Spatial autocorrelation for monthly precipitation was low during the dry season, and correlation increased markedly when data were temporally aggregated from a daily time scale to 4–5 days. The analysis manifested the high spatial and temporal variability caused by the diverse precipitationgenerating mechanisms and the need for an improved monitoring network.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Geovetenskap och miljövetenskap ->
Geovetenskap och miljövetenskap ->
Meteorologi och atmosfärforskning
Geovetenskap och miljövetenskap ->
Oceanografi, hydrologi, vattenresurser ->
precipitation, interpolation, gap-filling, South America
Ytterligare information:
Published online: 24 October 2009 ©Springer-Verlag 2009
Postens nummer:
Posten skapad:
2009-11-15 16:40
Posten ändrad:
2011-12-08 13:40

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