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A global temperature control of silicate weathering intensity
Kai Deng1,2, Shouye Yang3, Yulong Guo4
1State Key Laboratory of Marine Geology, Tongji University, 200092, Shanghai, China. kai.deng@erdw.ethz.ch.
Nature Communications
|April 5, 2022
Summary
Silicate weathering strongly depends on temperature, not precipitation. This suggests a more sensitive climate feedback at lower temperatures, impacting Earth's long-term climate regulation.
Area of Science:
- Geochemistry
- Climate Science
- Earth Science
Background:
- Silicate weathering is a key climate feedback, but its sensitivity to climatic factors is debated.
- Lack of weathering proxy validation and quantitative paleo-constraints hinder understanding.
Purpose of the Study:
- To investigate the relationship between silicate weathering intensity and environmental parameters at a catchment scale.
- To identify the primary drivers of silicate weathering using a global sediment dataset.
Main Methods:
- Analysis of a global compilation of modern sediment data (n=3828).
- Statistical examination of silicate weathering intensity against temperature, precipitation, and topographic-lithological factors.
Main Results:
- Temperature is the primary control on silicate weathering, showing a monotonic increase in feldspar dissolution from 0-30°C.
- Precipitation and topographic-lithological factors have regional and subordinate influences.
- Non-linear temperature-feldspar dissolution linked to reactive plagioclase depletion at higher temperatures.
Conclusions:
- The temperature-weathering feedback is stronger at lower surface temperatures.
- Results support increased land surface reactivity during late Cenozoic cooling.
- Understanding these feedbacks is crucial for paleoclimate reconstructions.
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