Accelerated multiphase water transformation in global mountain regions since 1990
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GRAPHICAL ABSTRACT
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PUBLIC SUMMARY
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Accelerated warming and lengthening ablation period since 1990s strengthened multiphase water transformation (MWT).
Warming and ablation period indices were higher in 1991–2017 than in 1960–1990.
Warming trends were greater in high-altitude regions than low-altitude regions.
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ABSTRACT
Mountains are sensitive to climate change, and while amplified warming at high elevations is widely observed and fairly well understood, changes in the water cycles of mountain regions remain poorly quantified. Due to low temperatures at higher elevations, these changes involve multiphase water transformation (MWT). Through analyzing extensive data from global mountain regions, we determined that under the accelerating warming and lengthening ablation period since the 1990s, the strengthening solid–liquid transformation can be confirmed for 45 glacier basins or single glaciers. This is marked by an increase of 21.5 km2/10a in glacier area retreat rate, 387.65 mm for average negative glacier mass balance, and 60 m/10a for average glacier length retreat rate (of 414 glaciers) from the study period before the 1990s until the period after the 1990s. The accelerating liquid–solid transformation was indicated by an increase of 31.2 d/10a for the delaying trend of complete freeze time, an increase of 4.3 d/10a for the advancing trend of complete melting time, and an increase of 3.9 d/10a for the decreasing trend of ice cover duration for 22 lakes from the period before the 1990s until the period after the 1990s. The accelerating liquid–gas transformation can be confirmed by an increase of 1 and 0.69 mm/d/10a in the variation trend of actual evaporation and bare-soil evaporation from 1980–1990 to 1990–2017, respectively. Snow sublimation decreased by 0.69 mm/d/10a during 1980–1990, followed by a statistically significant increase of 1.66 mm/d/10a during 1990–2017, further confirming the accelerating solid–gas transformation. The accelerating gas–solid transformation can be reflected by an increase of 0.3 d/10a for the decreasing trend of frost days from 1960–1990 to 1990–2017. The moisture recycling ratio decreased by –0.042 %/10a during 1980–1990 and then increased by 0.443 %/10a during 1990–2017, with the corresponding average values of 12.3% and 13.6%, respectively, which indicates an accelerating gas–liquid transformation. Approximately 59 rivers displayed an increase of 108.60 m3/s/10a for the runoff variation trend from the period before the 1990s until the period after the 1990s. In addition, the trends for lake number and lake area in the Tibetan Plateau increased 3.86 and 5.75 times, respectively, from 1976–1995 to 1995–2019. This acceleration can significantly change the spatiotemporal pattern of water resources and increase the frequency and intensity of disaster events, such as glacial lake outbursts, flooding, and waterlogging. Consequently, most mountain regions will require strong adaptation efforts to sustain water, food, and ecological security. -
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Li Z., Feng Q., Wang X., et al., (2023). Accelerated multiphase water transformation in global mountain regions since 1990. The Innovation Geoscience 1(3), 100033. https://doi.org/10.59717/j.xinn-geo.2023.100033
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Li Z., Feng Q., Wang X., et al., (2023). Accelerated multiphase water transformation in global mountain regions since 1990. The Innovation Geoscience 1(3), 100033. https://doi.org/10.59717/j.xinn-geo.2023.100033
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Figure 1.
Global mountainous region:
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Figure 2.
The times for variation rate of MWT after 1990 of that before 1990 in the global mountainous region:
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Figure 3.
The anomaly change rate of annual average temperature (TAVG) during 1960–1990 (oC/10a)
