DOI: 10.1007/s00382-010-0949-1
Scopus记录号: 2-s2.0-84855256922
论文题名: High-resolution precipitation and temperature downscaling for glacier models
作者: Jarosch A.H. ; Anslow F.S. ; Clarke G.K.C.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-01-02 起始页码: 391
结束页码: 409
语种: 英语
英文关键词: British Columbia
; Glacier modelling
; High resolution downscaling
; Precipitation
; Temperature
英文摘要: The spatial resolution gap between global or regional climate models and the requirements for local impact studies motivates the need for climate downscaling. For impact studies that involve glacier modelling, the sparsity or complete absence of climate monitoring activities within the regions of interest presents a substantial additional challenge. Downscaling methods for this application must be independent of climate observations and cannot rely on tuning to station data. We present new, computationally-efficient methods for downscaling precipitation and temperature to the high spatial resolutions required to force mountain glacier models. Our precipitation downscaling is based on an existing linear theory for orographic precipitation, which we modify for large study regions by including moist air tracking. Temperature is downscaled using an interpolation scheme that reconstructs the vertical temperature structure to estimate surface temperatures from upper air data. Both methods are able to produce output on km to sub-km spatial resolution, yet do not require tuning to station measurements. By comparing our downscaled precipitation (1 km resolution) and temperature (200 m resolution) fields to station measurements in southern British Columbia, we evaluate their performance regionally and through the annual cycle. Precipitation is improved by as much as 30% (median relative error) over the input reanalysis data and temperature is reconstructed with a mean bias of 0.5°C at locations with high vertical relief. Both methods perform best in mountainous terrain, where glaciers tend to be concentrated. © 2010 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55416
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Ocean Sciences, The University of British Columbia, 6339 Stores Road, V6T 1Z4 Vancouver, BC, Canada
Recommended Citation:
Jarosch A.H.,Anslow F.S.,Clarke G.K.C.. High-resolution precipitation and temperature downscaling for glacier models[J]. Climate Dynamics,2012-01-01,38(2017-01-02)