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Updated: Jun 17, 2026
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The Use of High-resolution Infrared Thermography (HRIT) for the Study of Ice Nucleation and Ice Propagation in Plants
Published on: May 8, 2015
Changes in Arctic vegetation amplify high-latitude warming through the greenhouse effect
Abigail L Swann1, Inez Y Fung, Samuel Levis
1Department of Earth & Planetary Science, University of California, Berkeley, CA 94720, USA. aswann@atmos.berkeley.edu
Summary
Arctic warming may lead to deciduous forests, increasing transpiration. This water vapor effect on climate is stronger than expected albedo changes, impacting sea-ice and ocean feedbacks.
Area of Science:
- Climate science
- Terrestrial biosphere dynamics
- Arctic ecosystem modeling
Background:
- Arctic climate is undergoing rapid change, with warming projected to significantly alter the Arctic biosphere.
- Paleo-records indicate past warm periods featured deciduous ecosystems in the Arctic.
- Current understanding emphasizes land surface albedo as the primary driver of tree-induced climate modification in high latitudes.
Purpose of the Study:
- To investigate the climate effects of introducing deciduous trees to high-latitude Arctic regions.
- To quantify the radiative forcing associated with enhanced transpiration versus albedo changes.
- To explore the feedback mechanisms involving water vapor, sea-ice, and ocean dynamics.
Main Methods:
- Utilized a global climate model coupled with an interactive terrestrial biosphere.
- Simulated the introduction of deciduous trees on bare ground in high northern latitudes.
- Analyzed top-of-atmosphere radiative imbalance, transpiration rates, and albedo forcing.
Main Results:
- Enhanced transpiration from expanded forest cover created a top-of-atmosphere radiative imbalance up to 1.5 times larger than albedo changes.
- Increased water vapor due to transpiration induced greenhouse warming, leading to sea-ice melt.
- Sea-ice melt triggered positive feedbacks via alterations in ocean albedo and evaporation.
Conclusions:
- Transpiration represents a significant, previously underestimated mechanism by which high-latitude vegetation influences climate.
- The expansion of Arctic forests can initiate substantial climate feedbacks through interactions with the ocean and sea-ice.
- Future Arctic vegetation changes may have profound impacts on global climate systems beyond albedo effects.
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