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Estimation de l'équilibre de masse poly-temporel des glaciers dans la partie occidentale du massif Qilian par InSAR bistatique et DEM WorldView

  • role： First author第一作者
  • Affiliation：

    State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China

    School of Earth and Planetary, University of Chinese Academy of Sciences, Beijing 100049, China

  • Email：ch10lichao@163.com
  • Introduction：李超，研究方向为冰川物质平衡大地测量研究。E-mail：ch10lichao@163.com
LI Chao12,  
  • role： Corresponding author通信作者
  • Affiliation：

    State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China

    School of Earth and Planetary, University of Chinese Academy of Sciences, Beijing 100049, China

  • Email：jlm@apm.ac.cn
  • Introduction：江利明，研究方向为影像大地测量理论、方法及应用。E-mail：jlm@apm.ac.cn
JIANG Liming12*,  
  • Affiliation：

    State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China

    MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China

LIU Lin13,  
  • Affiliation：

    State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China

    School of Earth and Planetary, University of Chinese Academy of Sciences, Beijing 100049, China

LI Tao12,  
  • Affiliation：

    State Key Laboratory of Geodesy and Earth’s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China

    School of Geography and Information Engineering, China University of Geosciences, Wuhan 430074, China

CHEN Yuanyuan14

résumé

L'équilibre de masse des glaciers, en tant qu'indicateur sensible du changement climatique, revêt une importance majeure pour la gestion des ressources en eau régionale, la prévention des risques liés aux glaciers et la prévision des variations du niveau marin mondial. Avec l'aggravation du réchauffement climatique, la fonte des glaciers dans la partie occidentale du massif du Qilian s'est accélérée depuis 2000. Cependant, ces dernières années, les variations interannuelles de l'équilibre de masse dans cette région, en particulier pour le glacier n°12 de la vallée du Tigre, restent peu connues. Cet article utilise des données DEM multi-sources générées par la photogrammétrie stéréoscopique optique WorldView, SRTM et l’InSAR bistatique TanDEM-X. La méthode de différence de DEM a été employée pour obtenir les taux de variation interannuelle de l’épaisseur de glace pour 2013-2014 et 2014-2015 ainsi que le taux de variation moyen de 2000 à 2015 dans la partie occidentale du massif Qilian, tout en obtenant les résultats correspondants d’équilibre de masse glaciaire pour ces périodes. Sur cette base, en prenant le glacier n°12 de la vallée du Tigre comme exemple, les taux de variation de l’équilibre de masse glaciaire pour les périodes 2013-2014, 2014-2015 et 2000-2015 ont été estimés, et l’impact des précipitations et des températures sur ces variations a été analysé. Les résultats indiquent que les taux de variation d’épaisseur de glace dans la partie occidentale du massif Qilian pour 2013-2014 et 2014-2015 étaient respectivement -0,35±0,034 m et -0,028±0,004 m, et les taux de variation de l’équilibre de masse étaient respectivement -0,27±0,014 m équivalent eau/an et -0,024±0,084 m équivalent eau/an. De 2000 à 2015, l’équilibre de masse moyen du glacier n°12 de la vallée du Tigre était de -0,013±0,02 m équivalent eau/an, indiquant un état de fonte. Le taux de perte de glace a ralenti de -0,33±0,04 m équivalent eau/an en 2013-2014 à -0,036±0,09 m équivalent eau/an en 2014-2015, principalement lié à une augmentation des précipitations en 2015. Cet article valide la faisabilité d’utiliser des données DEM stéréoscopiques optiques satellites de haute qualité pour estimer l’équilibre de masse interannuel des glaciers de montagne.

mots-clés

télédétection; DEM WorldView; DEM TanDEM-X; glacier n°12 de la vallée du Tigre; équilibre de masse; InSAR; Qilian

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