Snow formation relies primarily on transported moisture rather than local sources
Is it true that snow formation relies primarily on transported moisture rather than local sources?
Partly. Whether precipitation and snow formation rely more heavily on transported moisture or local sources varies significantly by geography and season, making broad generalizations contested.
Verdict: CONTESTED · 4 sources for, 2 against · Last checked
The claim addresses whether snow and precipitation formation relies primarily on transported moisture versus local sources. Several studies on precipitation and extreme events (e.g., in Greenland, Sichuan, and general atmospheric rivers) emphasize distant moisture transport and remote evaporation sources. However, regional studies like those in Xinjiang and the Tianshan Mountains show that local and regional continental evaporation can contribute the majority of moisture during certain seasons (such as summer). Since the relative importance of transported versus local moisture is highly dependent on geographic location, climatological regime, and season, the evidence points to a CONTESTED balance rather than a universal rule.
The evidence we hold leans leans supported
How this was weighed
official record 3x · fact-check 2x · hedged 1x · crowd & reference 1x
- Interannual variability of Greenland winter precipitation so · peer-reviewed · supports · weight 2 · 2008
- Moisture Origin and Meridional Transport in Atmospheric Rive · peer-reviewed · supports · weight 1.6 · 2013
- Moisture sources of an extreme precipitation event in Sichua · peer-reviewed · supports · weight 1.6 · 2015
- Lagrangian simulations of moisture sources for Chinese Xinji · peer-reviewed · supports · weight 1.3 · 2020
- Lagrangian simulations of moisture sources for Chinese Xinji · peer-reviewed · refutes · weight 1.3 · 2020
- Lagrangian Analysis of Moisture Sources of Precipitation in · peer-reviewed · refutes · weight 1.05 · 2022
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Sodemann, H., Schwierz, C., & Wernli, H. (2008). Interannual variability of Greenland winter precipitation sources: Lagrangian moisture diagnostic and North Atlantic Oscillation influence. doi.org. https://doi.org/10.1029/2007jd008503
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Yao, S., Jiang, D., & Zhang, Z. (2020). Lagrangian simulations of moisture sources for Chinese Xinjiang precipitation during 1979–2018. doi.org. https://doi.org/10.1002/joc.6679
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Sodemann, H. & Stohl, A. (2013). Moisture Origin and Meridional Transport in Atmospheric Rivers and Their Association with Multiple Cyclones*. doi.org. https://doi.org/10.1175/mwr-d-12-00256.1
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Huang, Y. & Cui, X. (2015). Moisture sources of an extreme precipitation event in Sichuan, China, based on the Lagrangian method. doi.org. https://doi.org/10.1002/asl2.562
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Yao, S., Jiang, D., & Zhang, Z. (2020). Lagrangian simulations of moisture sources for Chinese Xinjiang precipitation during 1979–2018. doi.org. https://doi.org/10.1002/joc.6679
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Guan, X., Langhamer, L., & Schneider, C. (2022). Lagrangian Analysis of Moisture Sources of Precipitation in the Tianshan Mountains, Central Asia. doi.org. https://doi.org/10.1029/2022ea002318
What does the evidence say?
The claim addresses whether snow and precipitation formation relies primarily on transported moisture versus local sources. Several studies on precipitation and extreme events (e.g., in Greenland, Sichuan, and general atmospheric rivers) emphasize distant moisture transport and remote evaporation sources. However, regional studies like those in Xinjiang and the Tianshan Mountains show that local and regional continental evaporation can contribute the majority of moisture during certain seasons (such as summer). Since the relative importance of transported versus local moisture is highly dependent on geographic location, climatological regime, and season, the evidence points to a CONTESTED balance rather than a universal rule.
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