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Accelerated land surface greening caused by earlier permafrost thawing
Hao Hua1,2, Jian Wang1,2, Constantin M Zohner3
1The Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.
Nature Communications
|December 16, 2025
Summary
Spring permafrost thawing is increasingly driving vegetation greenness in Arctic regions. This study reveals that earlier thawing due to warming significantly enhances plant growth, a trend current models fail to capture.
Area of Science:
- Earth System Science
- Ecology
- Climate Science
Background:
- Persistent warming advances spring permafrost thaw, potentially amplifying climate change via carbon feedbacks.
- The precise contribution of spring permafrost thaw variations to vegetation greening trends in permafrost regions is not well understood, hindering ecological impact assessments.
Purpose of the Study:
- To quantify the temporal relationship between spring permafrost thawing and vegetation greenness trends.
- To investigate the underlying biogeophysical mechanisms driving changes in this relationship.
- To evaluate the performance of Dynamic Global Vegetation Models in simulating these processes.
Main Methods:
- Analysis of 40-year freeze/thaw data.
- Utilization of multiple satellite-derived greenness indicators.
- Application of moving-window analyses to assess temporal sensitivity.
- Investigation of biogeophysical pathways like albedo, phenology, and soil moisture.
Main Results:
- A widespread increase in the sensitivity of spring greenness to spring permafrost thawing was identified over 40 years.
- Earlier permafrost thaw has played a progressively stronger role in promoting spring greening, especially in boreal forests and tundra.
- Biogeophysical pathways, including reduced albedo and earlier vegetation phenology, contribute to this increased sensitivity.
- Dynamic Global Vegetation Models consistently underestimate the magnitude and variability of this sensitivity.
Conclusions:
- Vegetation responses to permafrost freeze-thaw dynamics exhibit significant temporal changes.
- Advances in spring permafrost thaw are a critical driver of observed greening trends.
- Improved climate change models are needed to accurately project vegetation responses in permafrost regions.
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