Arid
DOI10.1016/j.rse.2010.08.011
Downscaling MODIS-derived maps using GIS and boosted regression trees: The case of frost occurrence over the arid Andean highlands of Bolivia
Pouteau, Robin1,2; Rambal, Serge2; Ratte, Jean-Pierre2; Goge, Fabien2; Joffre, Richard1,2; Winkel, Thierry1
通讯作者Winkel, Thierry
来源期刊REMOTE SENSING OF ENVIRONMENT
ISSN0034-4257
EISSN1879-0704
出版年2011
卷号115期号:1页码:117-129
英文摘要

Frost risk assessment is of critical importance in tropical highlands like the Andes where human activities thrives at altitudes up to 4200 m, and night frost may occur all the year round. In these semi-arid and cold regions with sparse meteorological networks, remote sensing and topographic modeling are of potential interest for understanding how physiography influences the local climate regime. After integrating night land surface temperature from the MODIS satellite, and physiographic descriptors derived from a digital elevation model, we explored how regional and landscape-scale features influence frost occurrence in the southern altiplano of Bolivia. Based on the high correlation between night land surface temperature and minimum air temperature, frost occurrence in early-, middle- and late-summer periods were calculated from satellite observations and mapped at a 1-km resolution over a 45,000 km(2) area. Physiographic modeling of frost occurrence was then conducted comparing multiple regression (MR) and boosted regression trees (BRT). Physiographic predictors were latitude, elevation, distance from salt lakes, slope steepness, potential insolation, and topographic convergence. Insolation influence on night frost was tested assuming that ground surface warming in the daytime reduces frost occurrence in the next night. Depending on the time period and the calibration domain. BRT models explained 74% to 90% of frost occurrence variation, outperforming the MR method. Inverted BRT models allowed the downscaling of frost occurrence maps at 100-m resolution, illustrating local processes like cold air drainage. Minimum temperature lapse rates showed seasonal variation and mean values higher than those reported for temperate mountains. When applied at regional and subregional scales successively, BRT models revealed prominent effects of elevation, latitude and distance to salt lakes at large scales, whereas slope, topographic convergence and insolation gained influence at local scales. Our results highlight the role of daytime insolation on night frost occurrence at local scale, particularly in the early- and mid-summer periods when solar astronomic forcing is maximum. Seasonal variations and interactions in physiographic effects are also shown. Nested effects of physiographic factors across scales are discussed, as well as potential applications of physiographic modeling to downscale ecological processes in complex terrains. (C) 2010 Elsevier Inc. All rights reserved.


英文关键词Altiplano Andes Bolivia Boosted regression trees DEM Downscaling Frost risk mapping MODIS Physiography Temperature lapse rate Topoclimate model Satellite land surface temperature Seasonal variation Spatial variation
类型Article
语种英语
国家France
收录类别SCI-E
WOS记录号WOS:000284663500011
WOS关键词CHENOPODIUM-QUINOA WILLD. ; TEMPERATURE LAPSE RATES ; COLD-AIR DRAINAGE ; MOUNTAINOUS TERRAIN ; LANDSCAPE-SCALE ; COMPLEX TERRAIN ; TROPICAL ANDES ; CLIMATE-CHANGE ; ALTIPLANO ; SURFACE
WOS类目Environmental Sciences ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向Environmental Sciences & Ecology ; Remote Sensing ; Imaging Science & Photographic Technology
来源机构French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/170310
作者单位1.CEFE CNRS, IRD, F-34293 Montpellier 5, France;
2.CEFE CNRS, UMR 5175, F-34293 Montpellier 5, France
推荐引用方式
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Pouteau, Robin,Rambal, Serge,Ratte, Jean-Pierre,et al. Downscaling MODIS-derived maps using GIS and boosted regression trees: The case of frost occurrence over the arid Andean highlands of Bolivia[J]. French National Research Institute for Sustainable Development,2011,115(1):117-129.
APA Pouteau, Robin,Rambal, Serge,Ratte, Jean-Pierre,Goge, Fabien,Joffre, Richard,&Winkel, Thierry.(2011).Downscaling MODIS-derived maps using GIS and boosted regression trees: The case of frost occurrence over the arid Andean highlands of Bolivia.REMOTE SENSING OF ENVIRONMENT,115(1),117-129.
MLA Pouteau, Robin,et al."Downscaling MODIS-derived maps using GIS and boosted regression trees: The case of frost occurrence over the arid Andean highlands of Bolivia".REMOTE SENSING OF ENVIRONMENT 115.1(2011):117-129.
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