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Article Dans Une Revue The Cryosphere Année : 2022

Review article: Global monitoring of snow water equivalent using high-frequency radar remote sensing

Leung Tsang
Michael Durand
  • Fonction : Auteur
Chris Derksen
  • Fonction : Auteur
Ana Barros
  • Fonction : Auteur
Do-Hyuk Kang
  • Fonction : Auteur
Hans Lievens
  • Fonction : Auteur
Hans-Peter Marshall
  • Fonction : Auteur
Jiyue Zhu
  • Fonction : Auteur
Joel Johnson
  • Fonction : Auteur
Joshua King
  • Fonction : Auteur
Juha Lemmetyinen
Melody Sandells
Nick Rutter
Paul Siqueira
  • Fonction : Auteur
Anne Nolin
  • Fonction : Auteur
Batu Osmanoglu
  • Fonction : Auteur
Carrie Vuyovich
  • Fonction : Auteur
Edward Kim
  • Fonction : Auteur
Drew Taylor
Ioanna Merkouriadi
  • Fonction : Auteur
Ludovic Brucker
Mahdi Navari
Marie Dumont
Richard Kelly
  • Fonction : Auteur
Rhae Sung Kim
Tien-Hao Liao
  • Fonction : Auteur
Firoz Borah
  • Fonction : Auteur
Xiaolan Xu

Résumé

Abstract. Seasonal snow cover is the largest single component of the cryosphere in areal extent, covering an average of 46 × 106 km2 of Earth's surface (31 % of the land area) each year, and is thus an important expression and driver of the Earth's climate. In recent years, Northern Hemisphere spring snow cover has been declining at about the same rate (∼ −13 % per decade) as Arctic summer sea ice. More than one-sixth of the world's population relies on seasonal snowpack and glaciers for a water supply that is likely to decrease this century. Snow is also a critical component of Earth's cold regions' ecosystems, in which wildlife, vegetation, and snow are strongly interconnected. Snow water equivalent (SWE) describes the quantity of water stored as snow on the land surface and is of fundamental importance to water, energy, and geochemical cycles. Quality global SWE estimates are lacking. Given the vast seasonal extent combined with the spatially variable nature of snow distribution at regional and local scales, surface observations are not able to provide sufficient SWE information. Satellite observations presently cannot provide SWE information at the spatial and temporal resolutions required to address science and high-socio-economic-value applications such as water resource management and streamflow forecasting. In this paper, we review the potential contribution of X- and Ku-band synthetic aperture radar (SAR) for global monitoring of SWE. SAR can image the surface during both day and night regardless of cloud cover, allowing high-frequency revisit at high spatial resolution as demonstrated by missions such as Sentinel-1. The physical basis for estimating SWE from X- and Ku-band radar measurements at local scales is volume scattering by millimeter-scale snow grains. Inference of global snow properties from SAR requires an interdisciplinary approach based on field observations of snow microstructure, physical snow modeling, electromagnetic theory, and retrieval strategies over a range of scales. New field measurement capabilities have enabled significant advances in understanding snow microstructure such as grain size, density, and layering. We describe radar interactions with snow-covered landscapes, the small but rapidly growing number of field datasets used to evaluate retrieval algorithms, the characterization of snowpack properties using radar measurements, and the refinement of retrieval algorithms via synergy with other microwave remote sensing approaches. This review serves to inform the broader snow research, monitoring, and application communities on progress made in recent decades and sets the stage for a new era in SWE remote sensing from SAR measurements.
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hal-03768795 , version 1 (05-09-2022)

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Leung Tsang, Michael Durand, Chris Derksen, Ana Barros, Do-Hyuk Kang, et al.. Review article: Global monitoring of snow water equivalent using high-frequency radar remote sensing. The Cryosphere, 2022, 16 (9), pp.3531-3573. ⟨10.5194/tc-16-3531-2022⟩. ⟨hal-03768795⟩
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