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DOI | 10.1002/joc.6300 |
Representation of the rain shadow effect in Patagonia using an orographic-derived regional climate model | |
Damseaux, Adrien1,2; Fettweis, Xavier1; Lambert, Marius1,3; Cornet, Yves1 | |
2019-09-18 | |
发表期刊 | INTERNATIONAL JOURNAL OF CLIMATOLOGY
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ISSN | 0899-8418 |
EISSN | 1097-0088 |
出版年 | 2019 |
文章类型 | Article;Early Access |
语种 | 英语 |
国家 | Belgium; Canada; Norway |
英文摘要 | This study focuses on Patagonia, where Foehn events observed in the lee of the Andes mountains are not yet well simulated by state-of-the-art climate models. It has been agreed that one source of this shortcoming is related to the poor relief representation in models. To resolve this need, a common method used is to enhance the spatial resolution of the model to retrieve a more complex surface elevation, at the expense of calculation time or surface area covered. This paper tackles the problem from a different angle by addressing the Digital Elevation Model (DEM) generalization, that is, the altitudes generalization from a high-resolution DEM to a coarser resolution grid model. Most current climate models use DEM generalization methods that smooth the relief, a key controlling factor in Foehn events modelling. The aim of this study is to compare three original methods of DEM generalization (percentile 90 [P90], envelope maximum [EM], and thalweg and crests [TC]) and to evaluate their impact on simulated precipitation and temperature fields on the eastern part of Patagonia, where warm and dry air masses are expected. Thanks to MAR, a Regional Climate Model, we validate the models at 10 and 5 km resolutions against the Climate Research Unit and perform three sensitivity experiments involving a change in the DEM generalization. Our results show that (a) a finer spatial resolution can slightly improve the temperature biases, however, it cannot resolve the precipitation biases and (b) a more appropriate use of DEM generalization induces a significant decrease in precipitation for the P90 and EM methods and an increase in mean temperature for all three methods in the study area. This study serves as a recommendation for a better use of DEM generalization in climate models performing in Patagonia, but also regions sharing the same orographic features as the Patagonian relief. |
英文关键词 | digital elevation model Foehn events orography spatial aggregation spatial generalization |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000486815400001 |
WOS关键词 | SURFACE MASS-BALANCE ; EASTERN PATAGONIA ; KATABATIC WINDS ; PRECIPITATION ; SIMULATION ; RESOLUTION ; AGGREGATION ; TEMPERATURE ; CIRCULATION ; SENSITIVITY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/187113 |
专题 | 气候变化 |
作者单位 | 1.Univ Liege, Dept Geog, Liege, Belgium; 2.Simon Fraser Univ, Dept Geog, Vancouver, BC, Canada; 3.Univ Oslo, Dept Geosci, Oslo, Norway |
推荐引用方式 GB/T 7714 | Damseaux, Adrien,Fettweis, Xavier,Lambert, Marius,et al. Representation of the rain shadow effect in Patagonia using an orographic-derived regional climate model[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2019. |
APA | Damseaux, Adrien,Fettweis, Xavier,Lambert, Marius,&Cornet, Yves.(2019).Representation of the rain shadow effect in Patagonia using an orographic-derived regional climate model.INTERNATIONAL JOURNAL OF CLIMATOLOGY. |
MLA | Damseaux, Adrien,et al."Representation of the rain shadow effect in Patagonia using an orographic-derived regional climate model".INTERNATIONAL JOURNAL OF CLIMATOLOGY (2019). |
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