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Schätzung der mehrperiodischen Massenbilanz von Gletschern im westlichen Abschnitt des Qilian-Gebirges mittels Dual-Station-InSAR und WorldView-DEM

  • 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

Resümee

Die Massenbilanz von Gletschern als empfindlicher Indikator für den Klimawandel ist von großer Bedeutung für das regionale Wassermanagement, die Verhinderung von Gletscherkatastrophen und die Vorhersage globaler Meeresspiegeländerungen. Mit der zunehmenden globalen Erwärmung beschleunigte sich seit 2000 das Abschmelzen der Gletscher im westlichen Abschnitt des Qilian-Gebirges. Dennoch sind die interannuelle Veränderung der Massenbilanz in dieser Region, insbesondere des Gletschers Nr. 12 im Laohugou-Tal, in den letzten Jahren nur wenig bekannt. Diese Studie verwendet mehrquellige DEM-Daten, die aus optischer WorldView-Stereo-Fotogrammetrie, SRTM und TanDEM-X Dual-Station-InSAR generiert wurden. Mit der DEM-Differenzmethode wurden die interannuelle Änderung der Eisdicke für die Perioden 2013–2014 und 2014–2015 sowie die durchschnittliche Änderung der Eisdicke von 2000 bis 2015 im westlichen Abschnitt des Qilian-Gebirges ermittelt und gleichzeitig die entsprechenden Ergebnisse der Gletschermassenbilanz für diese Zeiträume erhalten. Auf dieser Grundlage wurde am Beispiel des Gletschers Nr. 12 im Laohugou-Tal die Änderung der Gletschermassenbilanzraten für die Zeiträume 2013–2014, 2014–2015 und 2000–2015 geschätzt und der Einfluss von Niederschlags- und Temperaturänderungen auf die Massenbilanzanalyse untersucht. Die Ergebnisse zeigen, dass die Änderung der Eisdicke im westlichen Abschnitt des Qilian-Gebirges in den Jahren 2013–2014 und 2014–2015 -0,35±0,034 m bzw. -0,028±0,004 m betrug, die Änderung der Massenbilanzraten betrug -0,27±0,014 m Wasseräquivalent/Jahr bzw. -0,024±0,084 m Wasseräquivalent/Jahr. Im Zeitraum 2000–2015 betrug die durchschnittliche Massenbilanz des Gletschers Nr. 12 im Laohugou-Tal -0,013±0,02 m Wasseräquivalent/Jahr, der Gletscher befand sich im Abschmelzzustand. Die Eisverlustgeschwindigkeit verlangsamt sich von -0,33±0,04 m Wasseräquivalent/Jahr in 2013–2014 auf -0,036±0,09 m Wasseräquivalent/Jahr in 2014–2015, was hauptsächlich mit dem erhöhten Niederschlag im Jahr 2015 zusammenhängt. Diese Studie bestätigt die Machbarkeit der Verwendung hochwertiger optischer Stereo-DEM-Satellitendaten zur Berechnung der interannuelle Massenbilanz von Gebirgsgletschern.

Schlüsselwort

Fernerkundung; WorldView-DEM; TanDEM-X-DEM; Gletscher Nr. 12 im Laohugou-Tal; Massenbilanz; InSAR; Qilian

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