DOI: 10.1002/joc.6005
Scopus记录号: 2-s2.0-85061407186
论文题名: Assessments of downscaled climate data with a high-resolution weather station network reveal consistent but predictable bias
作者: Roberts D.R. ; Wood W.H. ; Marshall S.J.
刊名: International Journal of Climatology
ISSN: 8998418
出版年: 2019
语种: 英语
英文关键词: bias correction
; lapse rate
; mesonet
; Rocky Mountains
; topography
; validation
Scopus关键词: Ecology
; Landforms
; Large dataset
; Topography
; Weather information services
; Bias correction
; Lapse rate
; mesonet
; Rocky Mountains
; validation
; Climate change
英文摘要: Ecological analyses often incorporate high-resolution environmental data to capture species-environment relationships in modelling applications, and downscaled climate data are increasingly being used for such analyses. While such data products provide high precision, the accuracy of these data is seldom directly tested. Consequently, introduced bias from downscaling algorithms may propagate through analyses that incorporate these data products. Here, we utilize data from the Foothills Climate Array (FCA), a mesoscale grid of 232 weather stations in the prairies and eastern slopes of the Rocky Mountains in southern Alberta, Canada, to evaluate several publicly available downscaled climate products. We consider daily, monthly, and annual records for a suite of temperature and humidity variables. The FCA data are ideal to evaluate climate downscaling because they contain multi-year observations and cover a range of topographic conditions, from flat prairie grass- and croplands to mountainous terrain. We find that the downscaling algorithms improve the accuracy of climate variables over simple interpolations of low-resolution data, but errors are often large at validation locations (e.g., several °C for temperature variables), and downscaled datasets show notable elevational and seasonal bias for all variables. A bias adjustment analysis demonstrates that such bias can be greatly reduced with relatively simple regression-based models, even when only a small subset of observational data are used, provided they cover a relatively large spread of elevations. We discuss our findings in the context of climate change and ecological modelling and make general recommendations for consumers of downscaled climate data products. © 2019 Royal Meteorological Society Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/116632
Appears in Collections: 全球变化的国际研究计划
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作者单位: Arctic Institute of North America, University of Calgary, Calgary, AB, Canada; Department of Geography, University of Calgary, Calgary, AB, Canada
Recommended Citation:
Roberts D.R.,Wood W.H.,Marshall S.J.. Assessments of downscaled climate data with a high-resolution weather station network reveal consistent but predictable bias[J]. International Journal of Climatology,2019-01-01