globalchange  > 影响、适应和脆弱性
DOI: 10.5194/tc-12-1027-2018
Scopus ID: 2-s2.0-85044409220
Changes in Andes snow cover from MODIS data, 2000-2016
Author: Saavedra F; A; , Kampf S; K; , Fassnacht S; R; , Sibold J; S
Source Publication: Cryosphere
ISSN: 19940416
Publishing Year: 2018
Volume: 12, Issue:3
pages begin: 1027
pages end: 1046
Language: 英语
English Abstract: The Andes span a length of 7000 km and are important for sustaining regional water supplies. Snow variability across this region has not been studied in detail due to sparse and unevenly distributed instrumental climate data. We calculated snow persistence (SP) as the fraction of time with snow cover for each year between 2000 and 2016 from Moderate Resolution Imaging Spectroradiometer (MODIS) satellite sensors (500 m, 8-day maximum snow cover extent). This analysis is conducted between 8 and 36- S due to high frequency of cloud (>30% of the time) south and north of this range. We ran Mann-Kendall and Theil-Sens analyses to identify areas with significant changes in SP and snowline (the line at lower elevation where SPD20 %). We evaluated how these trends relate to temperature and precipitation from Modern-Era Retrospective Analysis for Research and Applications-2 (MERRA2) and University of Delaware datasets and climate indices as El Niño-Southern Oscillation (ENSO), Southern Annular Mode (SAM), and Pacific Decadal Oscillation (PDO). Areas north of 29° S have limited snow cover, and few trends in snow persistence were detected. A large area (34 370 km2) with persistent snow cover between 29 and 36- S experienced a significant loss of snow cover (2-5 fewer days of snow year-1). Snow loss was more pronounced (62% of the area with significant trends) on the east side of the Andes.We also found a significant increase in the elevation of the snowline at 10-30myear1 south of 29- 30° S. Decreasing SP correlates with decreasing precipitation and increasing temperature, and the magnitudes of these correlations vary with latitude and elevation. ENSO climate indices better predicted SP conditions north of 31° S, whereas the SAM better predicted SP south of 31° S. © 2018 Author(s) 2018.
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被引频次[WOS]:23   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:影响、适应和脆弱性

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Affiliation: Departamento de Ciencias Geográficas, Facultad de Ciencias Naturales y Exactas, Universidad de Playa Ancha, Leopoldo Carvallo 270, Playa Ancha, Valparaíso, Chile; Centro de Estudios Avanzados, Universidad de Playa Ancha, Traslaviña 450, Viña del Mar, Chile; Department of Ecosystem Science and Sustainability, Colorado State University, Fort CollinsCO, United States; Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, United States; Natural Resources Ecology Laboratory, Colorado State University, Fort Collins, CO, United States; Geographisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany; Department of Anthropology, Colorado State University, Fort Collins, CO, United States

Recommended Citation:
Saavedra F,A,, Kampf S,et al. Changes in Andes snow cover from MODIS data, 2000-2016[J]. Cryosphere,2018-01-01,12(3)
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