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Snowfall decrease in recent years undermines glacier health and meltwater resources in the Northwestern Pamirs.

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Area of Science:

  • Glaciology and Climate Science
  • Hydrology
  • Remote Sensing

Background:

  • Central Asia's mountain glaciers are critical for water resources.
  • The stability of these glaciers and factors influencing them remain poorly understood.
  • Glacier melt is a primary water source for downstream regions.

Purpose of the Study:

  • To reconstruct glacier changes in Tajikistan over the past two decades (1999-2023).
  • To identify the drivers behind recent declines in glacier health.
  • To assess the impact of changing snow conditions on glacier mass balance and runoff.

Main Methods:

  • Utilized in-situ observations, climate reanalysis, and remote sensing data.
  • Forced a land-surface model to simulate glacier dynamics.
  • Analyzed changes in snowfall, snow depth, and glacier mass balance.

Main Results:

  • Significant decrease in snowfall and snow depth observed since 2018.
  • Consequent decline in glacier health and reduced runoff generation.
  • Widespread snow depletion across the Northwestern Pamirs confirmed by remote sensing.

Conclusions:

  • Reduced snowfall is a primary driver of recent glacier mass loss in the region.
  • The findings explain the observed decline in Central Asian glacier health.
  • Further research into precipitation variability is essential for water resource management.