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Torbern Tagesson

Forskare

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Snow cover and snow albedo changes in the central Andes of Chile and Argentina from daily MODIS observations (2000–2016)

Författare

  • Jeppe K. Malmros
  • Sebastian H. Mernild
  • Ryan Wilson
  • Torbern Tagesson
  • Rasmus Fensholt

Summary, in English

The variables of snow cover extent (SCE), snow cover duration (SCD), and snow albedo (SAL) are primary factors determining the surface energy balance and hydrological response of the cryosphere, influencing snow pack and glacier mass-balance, melt, and runoff conditions. This study examines spatiotemporal patterns and trends in SCE, SCD, and SAL (2000–2016; 16 years) for central Chilean and Argentinean Andes using the MODIS MOD10A1 C6 daily snow product. Observed changes in these variables are analyzed in relation to climatic variability by using ground truth observations (meteorological data from the El Yeso Embalse and Valle Nevado weather stations) and the Multivariate El Niño index (MEI) data. We identified significant downward trends in both SCE and SAL, especially during the onset and offset of snow seasons. SCE and SAL showed high inter-annual variability which correlate significantly with MEI applied with a one-month time-lag. SCE and SCD decreased by an average of ~13 ± 2% and 43 ± 20 days respectively, over the study period. Analysis of spatial pattern of SCE indicates a slightly greater reduction on the eastern side (~14 ± 2%) of the Andes Cordillera compared to the western side (~12 ± 3%). The downward SCE, SAL, and SCD trends identified in this study are likely to have adverse impacts on downstream water resource availability to agricultural and densely populated regions in central Chile and Argentina.

Avdelning/ar

  • BECC: Biodiversity and Ecosystem services in a Changing Climate

Publiceringsår

2018-05-01

Språk

Engelska

Sidor

240-252

Publikation/Tidskrift/Serie

Remote Sensing of Environment

Volym

209

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Physical Geography

Nyckelord

  • Andes
  • Argentina
  • Chile
  • Climate change
  • ENSO
  • MOD10A1
  • MODIS
  • Snow albedo
  • Snow cover extent
  • Time series analysis

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0034-4257