DOI: 10.5194/tc-8-471-2014
Scopus记录号: 2-s2.0-84896607027
论文题名: Homogenisation of a gridded snow water equivalent climatology for Alpine terrain: Methodology and applications
作者: Jörg-Hess S ; , Fundel F ; , Jonas T ; , Zappa M
刊名: Cryosphere
ISSN: 19940416
出版年: 2014
卷: 8, 期: 2 起始页码: 471
结束页码: 485
语种: 英语
英文关键词: alpine environment
; data set
; homogeneity
; land surface
; snow water equivalent
; spatiotemporal analysis
; terrain
; water resource
; calibration
; catchment
; climatology
; cryosphere
; data set
; error analysis
; homogeneity
; hydrological modeling
; map
; runoff
; snow water equivalent
; terrain
; Alps
英文摘要: Gridded snow water equivalent (SWE) data sets are valuable for estimating the snow water resources and verify different model systems, e.g. hydrological, land surface or atmospheric models. However, changing data availability represents a considerable challenge when trying to derive consistent time series for SWE products. In an attempt to improve the product consistency, we first evaluated the differences between two climatologies of SWE grids that were calculated on the basis of data from 110 and 203 stations, respectively. The "shorter" climatology (2001-2009) was produced using 203 stations (map203) and the "longer" one (1971-2009) 110 stations (map110). Relative to map203, map110 underestimated SWE, especially at higher elevations and at the end of the winter season. We tested the potential of quantile mapping to compensate for mapping errors in map110 relative to map203. During a 9 yr calibration period from 2001 to 2009, for which both map203 and map110 were available, the method could successfully refine the spatial and temporal SWE representation in map110 by making seasonal, regional and altitude-related distinctions. Expanding the calibration to the full 39 yr showed that the general underestimation of map110 with respect to map203 could be removed for the whole winter. The calibrated SWE maps fitted the reference (map203) well when averaged over regions and time periods, where the mean error is approximately zero. However, deviations between the calibrated maps and map203 were observed at single grid cells and years. When we looked at three different regions in more detail, we found that the calibration had the largest effect in the region with the highest proportion of catchment areas above 2000ma.s.l. and that the general underestimation of map110 compared to map203 could be removed for the entire snow season. The added value of the calibrated SWE climatology is illustrated with practical examples: the verification of a hydrological model, the estimation of snow resource anomalies and the predictability of runoff through SWE. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/74875
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Zürcherstr. 111, 8903 Birmensdorf, Switzerland; WSL Institute for Snow and Avalanche Research, SLF, Flüelastr. 11, 7260 Davos, Switzerland; Deutscher Wetterdienst (DWD), Frankfurter Straße 135, 63067 Offenbach, Germany
Recommended Citation:
Jörg-Hess S,, Fundel F,, Jonas T,et al. Homogenisation of a gridded snow water equivalent climatology for Alpine terrain: Methodology and applications[J]. Cryosphere,2014-01-01,8(2)